因为前后端代码内容过多，这篇只写后端的代码，前端的在另一篇写
项目实战一：
1.创建数据库,表等数据
创建数据库
create database schedule_system创建表，并添加内容
SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- 创建日程表 -- ---------------------------- DROP TABLE IF EXISTS `sys_schedule`; CREATE TABLE `sys_schedule` ( `sid` int NOT NULL AUTO_INCREMENT, `uid` int NULL DEFAULT NULL, `title` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, `completed` int(1) NULL DEFAULT NULL, PRIMARY KEY (`sid`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- 插入日程数据 -- ---------------------------- -- ---------------------------- -- 创建用户表 -- ---------------------------- DROP TABLE IF EXISTS `sys_user`; CREATE TABLE `sys_user` ( `uid` int NOT NULL AUTO_INCREMENT, `username` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, `user_pwd` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, PRIMARY KEY (`uid`) USING BTREE, UNIQUE INDEX `username`(`username`) USING BTREE ) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- 插入用户数据 -- ---------------------------- INSERT INTO `sys_user` VALUES (1, 'zhangsan', 'e10adc3949ba59abbe56e057f20f883e'); INSERT INTO `sys_user` VALUES (2, 'lisi', 'e10adc3949ba59abbe56e057f20f883e'); SET FOREIGN_KEY_CHECKS = 1;
2.创建项目并导入一些需要的jar包
2.1项目结构
2.2导入依赖
<!--servlet项目所需依赖-->
<!--
druid 连接池
json的一些依赖
jackson-annotations
jackson-core
jackson-databind
lombok 简化实体类
mysql-connector 数据库驱动
jakarta.servlet-api servlet需要的
-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.23</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.13.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.13.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.34</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>6.1.0</version>
</dependency>2.3创建jdbc.properties文件
jdbc.user=root
jdbc.password=123456
jdbc.url=jdbc:mysql:///schedule_system
jdbc.driver=com.mysql.cj.jdbc.Driver3.创建实体类
因为我数据库两个表名分别叫sys_schedule和sys_user
所以为了方便起见我的实体表为：SysSchedule和SysUser
属性名称要和数据库表的字段名称最好保持一致
如果数据库表字段名称式驼峰式的 比如 sys_id 实体表属性可以设置为 sysId
将下划线后的那个字母设置为大写
SysUser实体类
/*
* 1 实体类的类名和表格名称应该对应 (对应不是一致)
* 2 实体类的属性名和表格的列名应该对应
* 3 每个属性都必须是私有的
* 4 每个属性都应该具备 getter setter
* 5 必须具备无参构造器
* 6 应该实现序列化接口( 缓存 分布式项目数据传递 可能会将对象序列化 )
* 7 应该重写类的hashcode和equals方法
* 8 toString是否重写都可以
*
*
* 使用lombok帮助我们生成这些内容 getter setter 全参构造 无参构造 equals hashcode
* lombok使用步骤
* 1 检查idea是否已经安装了lombok插件
* 2 检查是否勾选了 enable annotation processing
* 3 导入lombok的依赖
*
*
* */
@AllArgsConstructor // 添加了全参构造
@NoArgsConstructor // 添加了无参构造
@Data //getter setter equals hashcode toString
public class SysUser implements Serializable {
private Integer uid;
private String username;
private String userPwd;
}SysSchedule实体类
@AllArgsConstructor
@NoArgsConstructor
@Data
public class SysSchedule implements Serializable {
private Integer sid;
private Integer uid;
private String title;
private Integer completed;
}
4.创建全局统一json响应格式
4.1 创建一个枚举类（里面设置一些响应码和响应消息）
public enum ResultCodeEnum {
SUCCESS(200,"success"),
USERNAEM_ERROR(501,"usernameError"),
PASSWORD_ERROR(503,"passwordError"),
NOTLOGIN(504,"notlogin"),
USERNAME_USED(505,"usernameUsed");
private Integer code;
private String message;
private ResultCodeEnum(Integer code ,String message){
this.code= code;
this.message = message;
}
public Integer getCode() {
return code;
}
public String getMessage() {
return message;
}
}
4.2创建全局统一json响应格式类
package org.example.common;
//全局统一响应的JSON格式处理类
public class Result <T>{ //因为不确定返回消息是什么类型 ，所以这里声明了<T>
// 返回码
private Integer code;
// 返回消息
private String message;
// 返回数据
private T data;
public Result(){}
// 返回数据
protected static <T> Result<T> build(T data) { //将data添加进去
Result<T> result = new Result<T>();
if (data != null)
result.setData(data);
return result; //返回一个result对象
}
public static <T> Result<T> build(T body, Integer code, String message) { //
Result<T> result = build(body); // 创建一个result对象，并添加data对象
result.setCode(code);
result.setMessage(message);
return result;
}
public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {
Result<T> result = build(body); //创建result对象并添加data数据
result.setCode(resultCodeEnum.getCode()); //给响应码添加枚举类中的数据
result.setMessage(resultCodeEnum.getMessage()); //给响应消息添加枚举类中的数据
return result;
}
/**
* 操作成功
* @param data baseCategory1List
* @param <T>
* @return
*/
public static<T> Result<T> ok(T data){ //返回一个result对象，这是一个操作成功的数据，如果操作成功就执行它
Result<T> result = build(data); //创建result对象并添加data数据
return build(data, ResultCodeEnum.SUCCESS); //调用上面的方法，将枚举类中的ResultCodeEnum.SUCCESS赋值给响应码和响应消息并返回result
}
public Result<T> message(String msg){
this.setMessage(msg);
return this;
}
public Result<T> code(Integer code){
this.setCode(code);
return this;
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
}
5.设置一些工具类
5.1MD5加密（固定格式需要的时候复制一下）
public class MD5Util {
public static String encrypt(String strSrc) {
try {
char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'a', 'b', 'c', 'd', 'e', 'f' };
byte[] bytes = strSrc.getBytes(); //使用平台的默认字符集将此 String 编码为 byte 序列，并 将结果存储到一个新的 byte 数组中。
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(bytes);
bytes = md.digest();
int j = bytes.length;
char[] chars = new char[j * 2];
int k = 0;
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
chars[k++] = hexChars[b >>> 4 & 0xf];
chars[k++] = hexChars[b & 0xf];
}
return new String(chars);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
throw new RuntimeException("MD5加密出错");
}
}
}
5.2 创建导入jdbc.properties和生成Connection对象的工具类(需要的时候复制就可以)
package org.example.util;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
public class JDBCUtil {
private static ThreadLocal<Connection> threadLocal =new ThreadLocal<>();
private static DataSource dataSource;
// 初始化连接池
static{
// 可以帮助我们读取.properties配置文件
Properties properties =new Properties();
InputStream resourceAsStream = JDBCUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");
try {
properties.load(resourceAsStream);
} catch (IOException e) {
throw new RuntimeException(e);
}
try {
dataSource = DruidDataSourceFactory.createDataSource(properties);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/*1 向外提供连接池的方法*/
public static DataSource getDataSource(){
return dataSource;
}
/*2 向外提供连接的方法*/
public static Connection getConnection(){
Connection connection = threadLocal.get();
if (null == connection) {
try {
connection = dataSource.getConnection();
} catch (SQLException e) {
throw new RuntimeException(e);
}
threadLocal.set(connection);
}
return connection;
}
/*定义一个归还连接的方法 (解除和ThreadLocal之间的关联关系) */
public static void releaseConnection(){
Connection connection = threadLocal.get();
if (null != connection) {
threadLocal.remove();
// 把连接设置回自动提交的连接
try {
connection.setAutoCommit(true);
// 自动归还到连接池
connection.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
}
5.3创建WEBUtil工具类(需要的时候复制就可以，用来转化json和将json响应出去的)
package org.example.util;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.example.common.Result;
import java.io.BufferedReader;
import java.io.IOException;
import java.text.SimpleDateFormat;
public class WebUtil {
private static ObjectMapper objectMapper;
// 初始化objectMapper
static{
objectMapper=new ObjectMapper();
// 设置JSON和Object转换时的时间日期格式
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
}
// 从请求中获取JSON串并转换为Object
public static <T> T readJson(HttpServletRequest request, Class<T> clazz){
T t =null;
BufferedReader reader = null;
try {
reader = request.getReader();
StringBuffer buffer =new StringBuffer();
String line =null;
while((line = reader.readLine())!= null){
buffer.append(line);
}
t= objectMapper.readValue(buffer.toString(),clazz);
} catch (IOException e) {
throw new RuntimeException(e);
}
return t;
}
// 将Result对象转换成JSON串并放入响应对象
public static void writeJson(HttpServletResponse response, Result result){
response.setContentType("application/json;charset=UTF-8");
try {
String json = objectMapper.writeValueAsString(result);
response.getWriter().write(json);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
5.4创建一个统一对数据增删改查的工具类（需要的时候复制粘贴）
package org.example.dao;
import org.example.util.JDBCUtil;
import java.lang.reflect.Field;
import java.sql.*;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
public class BaseDao {
public <T> T baseQueryObject(Class<T> clazz, String sql, Object ... args) {
T t = null;
Connection connection = JDBCUtil.getConnection();
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
int rows = 0;
try {
// 准备语句对象
preparedStatement = connection.prepareStatement(sql);
// 设置语句上的参数
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i + 1, args[i]);
}
// 执行 查询
resultSet = preparedStatement.executeQuery();
if (resultSet.next()) {
t = (T) resultSet.getObject(1);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != resultSet) {
try {
resultSet.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (null != preparedStatement) {
try {
preparedStatement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
JDBCUtil.releaseConnection();
}
return t;
}
// 公共的查询方法 返回的是对象的集合
public <T> List<T> baseQuery(Class clazz, String sql, Object ... args){
List<T> list =new ArrayList<>();
Connection connection = JDBCUtil.getConnection();
PreparedStatement preparedStatement=null;
ResultSet resultSet =null;
int rows = 0;
try {
// 准备语句对象
preparedStatement = connection.prepareStatement(sql);
// 设置语句上的参数
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i+1,args[i]);
}
// 执行 查询
resultSet = preparedStatement.executeQuery();
ResultSetMetaData metaData = resultSet.getMetaData();
int columnCount = metaData.getColumnCount();
// 将结果集通过反射封装成实体类对象
while (resultSet.next()) {
// 使用反射实例化对象
Object obj =clazz.getDeclaredConstructor().newInstance();
for (int i = 1; i <= columnCount; i++) {
String columnName = metaData.getColumnLabel(i);
Object value = resultSet.getObject(columnName);
// 处理datetime类型字段和java.util.Data转换问题
if(value.getClass().equals(LocalDateTime.class)){
value= Timestamp.valueOf((LocalDateTime) value);
}
Field field = clazz.getDeclaredField(columnName);
field.setAccessible(true);
field.set(obj,value);
}
list.add((T)obj);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null !=resultSet) {
try {
resultSet.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
if (null != preparedStatement) {
try {
preparedStatement.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
JDBCUtil.releaseConnection();
}
return list;
}
// 通用的增删改方法
public int baseUpdate(String sql,Object ... args) {
// 获取连接
Connection connection = JDBCUtil.getConnection();
PreparedStatement preparedStatement=null;
int rows = 0;
try {
// 准备语句对象
preparedStatement = connection.prepareStatement(sql);
// 设置语句上的参数
for (int i = 0; i < args.length; i++) {
preparedStatement.setObject(i+1,args[i]);
}
// 执行 增删改 executeUpdate
rows = preparedStatement.executeUpdate();
// 释放资源(可选)
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (null != preparedStatement) {
try {
preparedStatement.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
JDBCUtil.releaseConnection();
}
// 返回的是影响数据库记录数
return rows;
}
}
6.创建跨域过滤器和登入过滤器
6.1跨域过滤器(需要的时候复制)
未来我们使用框架,फ接用一个@CrossOrigin 就可以解决跨ֿ域了。
package org.example.filter;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter("/*")
public class CrosFilter implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
System.out.println(request.getMethod());
HttpServletResponse response = (HttpServletResponse) servletResponse;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT,OPTIONS, DELETE, HEAD");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
// 非预检请求,放行即可,预检请求,则到此结束,不需要放行
if(!request.getMethod().equalsIgnoreCase("OPTIONS")){
filterChain.doFilter(servletRequest, servletResponse);
}
}
}
6.2登入过滤器
没有登入的话不允许访问其他网页，直接重定向到登入界面。
登入成功才可以访问其他网页
public class LoginFilter implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
// 参数父转子
HttpServletRequest request =(HttpServletRequest) servletRequest;
HttpServletResponse response =(HttpServletResponse) servletResponse;
// 获得session域对象
HttpSession session = request.getSession();
// 从session域中获得登录的用户对象
SysUser sysUser = (SysUser)session.getAttribute("sysUser");
// 判断用户对象是否为空
if(null == sysUser){
// 没登录 到login.html
response.sendRedirect("/login.html");
}else{
// 登录过 放行
filterChain.doFilter(request,response);
}
}
}
7.三层架构(service,dao,servlet)
7.0创建全局处理servlet类（重点）
//全局处理servlet
public class BaseContoller extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String requestURI = req.getRequestURI(); // /schedule/add
String[] split = requestURI.split("/");
String methodName = split[split.length-1];
// 使用 反射 通过方法名获取下面的方法
Class aClass = this.getClass();
// 获取方法
try {
Method declaredMethod = aClass.getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
//暴力 破解方法的访问修饰符的限制
declaredMethod.setAccessible(true);
// 执行方法
declaredMethod.invoke(this,req,resp);
} catch (Exception e) {
e.printStackTrace();
}
}
}
7.1.1 SysUser dao层
SysUserdao 接口
public interface SysUserDao {
/**
* 向数据库中增加一条用户记录的方法
* @param sysUser 要增加的记录的username和user_pwd字段以SysUser实体类对象的形式接收
* @return 增加成功返回1 增加失败返回0
*/
int addSysUser(SysUser sysUser);
/**
* 根据用户名获得完整用户信息的方法
* @param username 要查询的用户名
* @return 如果找到了返回SysUser对象,找不到返回null
*/
SysUser findByUsername(String username);
}实现类
这里实现了SysUserdao接口，并且还继承了BaseDao工具类，所以可以直接使用它的方法
public class SysUserDaoImpl extends BaseDao implements SysUserDao {
//注册账户
@Override
public int addSysUser(SysUser sysUser) {
String sql ="insert into sys_user values(DEFAULT,?,?)";
return baseUpdate(sql,sysUser.getUsername(),sysUser.getUserPwd());
}
//验证账户是否已被占用，登入账户，两个功能
@Override
public SysUser findByUsername(String username) {
String sql ="select uid,username,user_pwd userPwd from sys_user where username = ?";
List<SysUser> sysUserList = baseQuery(SysUser.class, sql, username);
return sysUserList!= null && sysUserList.size()>0? sysUserList.get(0): null ;
}
}7.1.2service层
SysUserService接口
public interface SysUserService {
/**
* 注册用户的方法
* @param sysUser 要注册的用户名和明文密码以SysUser对象的形式接收
* @return 注册成功返回1 注册失败返回0
*/
int regist(SysUser sysUser);
/**
* 根据用户名获得完整用户信息的方法
* @param username 要查询的用户名
* @return 如果找到了返回SysUser对象,找不到返回null
*/
SysUser findByUsername(String username);
}
SysUserService接口实现类
public class SysUserServiceImpl implements SysUserService {
private SysUserDao userDao =new SysUserDaoImpl();
@Override
public int regist(SysUser sysUser) {
// 将用户的明文密码转换为密文密码
sysUser.setUserPwd(MD5Util.encrypt(sysUser.getUserPwd()));
// 调用DAO 层的方法 将sysUser信息存入数据库
return userDao.addSysUser(sysUser);
}
@Override
public SysUser findByUsername(String username) {
return userDao.findByUsername(username);
}
}
7.1.3servlet层
package org.example.servlet;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.example.common.Result;
import org.example.common.ResultCodeEnum;
import org.example.pojo.SysUser;
import org.example.service.SysUserService;
import org.example.service.imp.SysUserServiceImpl;
import org.example.util.MD5Util;
import org.example.util.WebUtil;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@WebServlet("/user/*")
public class SysUserController extends BaseContoller {
private SysUserService userService = new SysUserServiceImpl();
/**
* 注册时,接收要注册的用户名,校验用户名是否被占用的业务接口
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
//注册的时候，看当前用户名是否被占用
protected void checkUsernameUsed(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收用户名
String username = req.getParameter("username");
// 调用服务层业务处理方法查询该用于名是否有对应的用户
SysUser sysUser = userService.findByUsername(username);
// 如果有 响应 已占用
// 如果没有 响应 可用
Result result = Result.ok(null);
if (null != sysUser) {
result = Result.build(null, ResultCodeEnum.USERNAME_USED);
}
// 将result对象转换为JSON串响应给客户端
WebUtil.writeJson(resp, result);
}
/**
* 接收用登录请求,完成的登录业务接口
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
//登入
protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1 接收用户名和密码
SysUser sysUser = WebUtil.readJson(req, SysUser.class);
//2 调用服务层方法,根据用户名查询用户信息
SysUser loginUser = userService.findByUsername(sysUser.getUsername());
Result result = null;
if (null == loginUser) {
result = Result.build(null, ResultCodeEnum.USERNAEM_ERROR);
} else if (!MD5Util.encrypt(sysUser.getUserPwd()).equals(loginUser.getUserPwd())) {
result = Result.build(null, ResultCodeEnum.PASSWORD_ERROR);
} else {
// 登录程序,将用户uid和username响应给客户端
Map data = new HashMap();
loginUser.setUserPwd("");
data.put("loginUser", loginUser);
result = Result.ok(data);
}
// 3将登录结果响应给客户端
WebUtil.writeJson(resp, result);
}
/**
* 接收用户注册请求的业务处理方法( 业务接口 不是java中的interface )
*
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
//注册
protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 1 接收客户端提交的json参数,并转换为User对象,获取信息
SysUser registUer = WebUtil.readJson(req, SysUser.class);
// 2 调用服务层方法,完成注册功能
//将参数放入一个SysUser对象中,在调用regist方法时传入
int rows = userService.regist(registUer);
// 3 根据注册结果(成功 失败) 做页面跳转
Result result = Result.ok(null);
if (rows < 1) {
result = Result.build(null, ResultCodeEnum.USERNAME_USED);
}
WebUtil.writeJson(resp, result);
}
}7.2.1 SysSchedule dao层
SysScheduleDao接口
public interface SysScheduleDao {
/**
* 用于向数据中增加一条日程记录
* @param schedule 日程数据以SysSchedule实体类对象形式入参
* @return 返回影响数据库记录的行数, 行数为0说明增加失败,行数大于0说明增加成功
*/
int addSchedule(SysSchedule schedule);
/**
* 查询所有用户的所有日程
* @return 将所有日程放入一个:List<SysSchedule>集合中返回
*/
List<SysSchedule> findAll();
List<SysSchedule> findItemListByUid(int uid);
Integer addDefault(int uid);
Integer updateSchedule(SysSchedule schedule);
Integer removeSchedule(int sid);
}
对应的实现类
public class SysScheduleDaoImpl extends BaseDao implements SysScheduleDao {
@Override
public int addSchedule(SysSchedule schedule) {
String sql ="insert into sys_schedule values(DEFAULT,?,?,?)";
int rows = baseUpdate(sql,schedule.getUid(),schedule.getTitle(),schedule.getCompleted());
return rows;
}
@Override
public List<SysSchedule> findAll() {
String sql ="select sid,uid,title,completed from sys_schedule";
List<SysSchedule> scheduleList = baseQuery(SysSchedule.class, sql);
return scheduleList;
}
@Override
public List<SysSchedule> findItemListByUid(int uid) {
String sql = "select sid ,uid,title,completed from sys_schedule where uid = ? ";
List<SysSchedule> itemList = baseQuery(SysSchedule.class, sql, uid);
return itemList;
}
@Override
public Integer addDefault(int uid) {
String sql = "insert into sys_schedule values (DEFAULT,?,'请输入日程',0) ";
return baseUpdate(sql,uid);
}
@Override
public Integer updateSchedule(SysSchedule schedule) {
String sql ="update sys_schedule set title = ? ,completed = ? where sid = ?";
return baseUpdate(sql,schedule.getTitle(),schedule.getCompleted(),schedule.getSid());
}
@Override
public Integer removeSchedule(int sid) {
String sql = "delete from sys_schedule where sid = ?";
return baseUpdate(sql,sid);
}
}
7.2.2service层
接口
public interface SysScheduleService {
List<SysSchedule> findItemListByUid(int uid);
Integer addDefault(int uid);
Integer updateSchedule(SysSchedule schedule);
Integer removeSchedul(int sid);
}
实现类
public class SysScheduleServiceImpl implements SysScheduleService {
private SysScheduleDao scheduleDao =new SysScheduleDaoImpl();
@Override
public List<SysSchedule> findItemListByUid(int uid) {
return scheduleDao.findItemListByUid(uid);
}
@Override
public Integer addDefault(int uid) {
return scheduleDao.addDefault(uid);
}
@Override
public Integer updateSchedule(SysSchedule schedule) {
return scheduleDao.updateSchedule(schedule);
}
@Override
public Integer removeSchedul(int sid) {
return scheduleDao.removeSchedule(sid);
}
}
7.2.3servlet层
@WebServlet( "/schedule/*")
public class SysScheduleController extends BaseContoller {
private SysScheduleService scheduleService =new SysScheduleServiceImpl();
protected void removeSchedule(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
int sid = Integer.parseInt(req.getParameter("sid"));
// 调用服务层方法 删除数据
scheduleService.removeSchedul(sid);
// 响应 成功信息
WebUtil.writeJson(resp, Result.ok(null));
}
protected void updateSchedule(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收请求体中的JSON串 转换成一个SysSchedule
SysSchedule schedule = WebUtil.readJson(req, SysSchedule.class);
// 调用服务层方法,将信息更新进入数据
scheduleService.updateSchedule(schedule);
WebUtil.writeJson(resp,Result.ok(null));
}
protected void addDefaultSchedule(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收请求中的uid参数
int uid =Integer.parseInt(req.getParameter("uid"));
// 调用服务层方法,向数据库中 增加一条 空记录
scheduleService.addDefault(uid);
WebUtil.writeJson(resp,Result.ok(null));
}
protected void findAllSchedule(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收请求中的uid参数
int uid =Integer.parseInt(req.getParameter("uid"));
// 查询用户的所有日程
List<SysSchedule> itemList =scheduleService.findItemListByUid(uid);
// 将用户的所有日程放入一个Result对象
Map data =new HashMap();
data.put("itemList",itemList);
Result result = Result.ok(data);
// 将Result对象转换为json响应给客户端
WebUtil.writeJson(resp,result);
}
}
项目实战一结束
项目实战二
全局json统一返回类省略
枚举类省略
MD5工具类省略
jdbc需要的两个工具类省略（一个引入properties和创建Conn对象的类，一个增删改查的类）
跨域过滤器省略
Webutil省略
全局处理servlet类省略
需要的jar包和上面的的一样
jdbc..properties文件省略
以上参考上一个项目，可直接复制粘贴，这里就不展示了
在上面那个的基础上，新增两个jar包，用于token
<!--token-->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>1.创建数据库,表等操作
1.1创建数据库
create database top_news1.2创建数据库表，并添加数据
DROP TABLE IF EXISTS `news_headline`;
CREATE TABLE `news_headline` (
`hid` int NOT NULL AUTO_INCREMENT COMMENT '头条id',
`title` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '头条标题',
`article` varchar(5000) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '头条新闻内容',
`type` int NOT NULL COMMENT '头条类型id',
`publisher` int NOT NULL COMMENT '头条发布用户id',
`page_views` int NOT NULL COMMENT '头条浏览量',
`create_time` datetime(0) NULL DEFAULT NULL COMMENT '头条发布时间',
`update_time` datetime(0) NULL DEFAULT NULL COMMENT '头条最后的修改时间',
`is_deleted` int NULL DEFAULT NULL COMMENT '头条是否被删除 1 删除 0 未删除',
PRIMARY KEY (`hid`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = DYNAMIC;
-- ----------------------------
-- Records of news_headline
-- ----------------------------
INSERT INTO `news_headline` VALUES (1, 'aaasd', 1, 1, 0, '2023-06-25 09:26:20', '2023-06-25 09:26:20', 0);
INSERT INTO `news_headline` VALUES (2, 'bbbb', 1, 1, 0, '2023-06-25 09:28:06', '2023-06-25 09:28:06', 0);
INSERT INTO `news_headline` VALUES (3, 'ccc。', 1, 1, 0, '2023-06-25 09:31:00', '2023-06-25 09:31:00', 0);
INSERT INTO `news_headline` VALUES (4, 'ddd', 1, 1, 0, '2023-06-25 09:31:36', '2023-06-25 09:31:36', 0);
-- ----------------------------
-- Table structure for news_type
-- ----------------------------
DROP TABLE IF EXISTS `news_type`;
CREATE TABLE `news_type` (
`tid` int NOT NULL AUTO_INCREMENT COMMENT '新闻类型id',
`tname` varchar(10) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '新闻类型描述',
PRIMARY KEY (`tid`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 8 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = DYNAMIC;
-- ----------------------------
-- Records of news_type
-- ----------------------------
INSERT INTO `news_type` VALUES (1, '新闻');
INSERT INTO `news_type` VALUES (2, '体育');
INSERT INTO `news_type` VALUES (3, '娱乐');
INSERT INTO `news_type` VALUES (4, '科技');
INSERT INTO `news_type` VALUES (5, '其他');
-- ----------------------------
-- Table structure for news_user
-- ----------------------------
DROP TABLE IF EXISTS `news_user`;
CREATE TABLE `news_user` (
`uid` int NOT NULL AUTO_INCREMENT COMMENT '用户id',
`username` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '用户登录名',
`user_pwd` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '用户登录密码密文',
`nick_name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT '用户昵称',
PRIMARY KEY (`uid`) USING BTREE,
UNIQUE INDEX `username_unique`(`username`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 9 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = DYNAMIC;
-- ----------------------------
-- Records of news_user
-- ----------------------------
INSERT INTO `news_user` VALUES (1, 'zhangsan', 'e10adc3949ba59abbe56e057f20f883e', '张三');
INSERT INTO `news_user` VALUES (2, 'lisi', 'e10adc3949ba59abbe56e057f20f883e', '李四');
INSERT INTO `news_user` VALUES (5, 'zhangxiaoming', 'e10adc3949ba59abbe56e057f20f883e', '张小明');
INSERT INTO `news_user` VALUES (6, 'xiaohei', 'e10adc3949ba59abbe56e057f20f883e', '李小黑');
SET FOREIGN_KEY_CHECKS = 1;
update news_headline set create_time=now() ,update_time=now()
2.创建JwtHelperٖ工具类
package org.example.util;
import com.alibaba.druid.util.StringUtils;
import io.jsonwebtoken.*;
import java.util.Date;
public class JwtHelper {
private static long tokenExpiration = 24*60*60*1000;
private static String tokenSignKey = "123456";
//生成token字符串
public static String createToken(Long userId) {
String token = Jwts.builder()
.setSubject("YYGH-USER")
.setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
.claim("userId", userId)
.signWith(SignatureAlgorithm.HS512, tokenSignKey)
.compressWith(CompressionCodecs.GZIP)
.compact();
return token;
}
//从token字符串获取userid
public static Long getUserId(String token) {
if(StringUtils.isEmpty(token)) return null;
Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
Claims claims = claimsJws.getBody();
Integer userId = (Integer)claims.get("userId");
return userId.longValue();
}
//判断token是否有效
public static boolean isExpiration(String token){
try {
boolean isExpire = Jwts.parser()
.setSigningKey(tokenSignKey)
.parseClaimsJws(token)
.getBody()
.getExpiration().before(new Date());
//没有过期，有效，返回false
return isExpire;
}catch(Exception e) {
//过期出现异常，返回true
return true;
}
}
}3.创建实体类与它的vo
3.1实体类
NewsHeadline
@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsHeadline implements Serializable {
private Integer hid;
private String title;
private String article;
private Integer type;
private Integer publisher;
private Integer pageViews;
private Date createTime;
private Date updateTime;
private Integer isDeleted;
}NewsType
@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsType implements Serializable {
private Integer tid;
private String tname;
}NewsUser
@AllArgsConstructor
@NoArgsConstructor
@Data
public class NewsUser implements Serializable {
private Integer uid;
private String username;
private String userPwd;
private String nickName;
}3.2 vo类
HeadlineDetailVo
@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineDetailVo implements Serializable {
private Integer hid;
private String title;
private String article;
private Integer type;
private String typeName;
private Integer pageViews;
private Long pastHours;
private Integer publisher;
private String author;
}HeadlinePageVo
@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlinePageVo implements Serializable {
private Integer hid;
private String title;
private Integer type;
private Integer pageViews;
private Long pastHours;
private Integer publisher;
}
HeadlineQueryVo
@AllArgsConstructor
@NoArgsConstructor
@Data
public class HeadlineQueryVo implements Serializable {
private String keyWords;
private Integer type ;
private Integer pageNum;
private Integer pageSize;
}
4.登入过滤器
@WebFilter("/headline/*")
public class LoginFilter implements Filter {
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest request =(HttpServletRequest) servletRequest;
HttpServletResponse response =(HttpServletResponse) servletResponse;
String token = request.getHeader("token");
boolean flag = null != token && (!JwtHelper.isExpiration(token));
if(flag){
filterChain.doFilter(servletRequest,servletResponse);
}else{
WebUtil.writeJson(response, Result.build(null, ResultCodeEnum.NOTLOGIN));
}
}
}5.三层架构
dao层
NewsHeadlineDao接口
public interface NewsHeadlineDao {
/**
*
* @param headlineQueryVo
* @return
*/
List<HeadlinePageVo> findPageList(HeadlineQueryVo headlineQueryVo);
/**
*
* @param headlineQueryVo
* @return
*/
int findPageCount(HeadlineQueryVo headlineQueryVo);
/**
*
* @param hid
* @return
*/
int incrPageViews(int hid);
/**
*
* @param hid
* @return
*/
HeadlineDetailVo findHealineDetail(int hid);
int addNewsHeadline(NewsHeadline newsHeadline);
/**
*
* @param hid
* @return
*/
NewsHeadline findByHid(Integer hid);
int update(NewsHeadline newsHeadline);
int removeByHid(int hid);
}
NewsTypeDao接口
public interface NewsTypeDao {
/**
*
* @return
*/
List<NewsType> findAll();
}
NewsUserDao接口
public interface NewsUserDao {
/**
*
* @param username
* @return
*/
NewsUser findByUsername(String username);
/**
*
* @param userId
* @return
*/
NewsUser findByUid(Integer userId);
/**
*
* @param registUser
* @return
*/
Integer insertUser(NewsUser registUser);
}
NewsHeadlineDaoImpl实现类
public class NewsHeadlineDaoImpl extends BaseDao implements NewsHeadlineDao {
/*
*
* private Integer hid;
private String title;
private Integer type;
private Integer pageViews;
private Long pastHours;
private Integer publisher;
*
*
*
* private String keyWords;
private Integer type ;
private Integer pageNum;
private Integer pageSize;
*
* */
@Override
public List<HeadlinePageVo> findPageList(HeadlineQueryVo headlineQueryVo) {
List params = new ArrayList();
String sql = """
select
hid ,
title,
type,
page_views pageViews,
TIMESTAMPDIFF(HOUR,create_time,now()) pastHours ,
publisher
from
news_headline
where
is_deleted = 0
""";
if (headlineQueryVo.getType() != 0 ){
sql = sql.concat(" and type = ? ");
params.add(headlineQueryVo.getType());
}
if(headlineQueryVo.getKeyWords() != null && !headlineQueryVo.getKeyWords().equals("")){
sql = sql.concat(" and title like ? ");
params.add("%"+headlineQueryVo.getKeyWords()+"%");
}
sql=sql.concat(" order by pastHours ASC , page_views DESC ");
sql=sql.concat(" limit ? , ? ");
params.add((headlineQueryVo.getPageNum()-1)*headlineQueryVo.getPageSize());
params.add(headlineQueryVo.getPageSize());
return baseQuery(HeadlinePageVo.class,sql,params.toArray());
}
@Override
public int findPageCount(HeadlineQueryVo headlineQueryVo) {
List params = new ArrayList();
String sql = """
select
count(1)
from
news_headline
where
is_deleted = 0
""";
if (headlineQueryVo.getType() != 0 ){
sql = sql.concat(" and type = ? ");
params.add(headlineQueryVo.getType());
}
if(headlineQueryVo.getKeyWords() != null && !headlineQueryVo.getKeyWords().equals("")){
sql = sql.concat(" and title like ? ");
params.add("%"+headlineQueryVo.getKeyWords()+"%");
}
Long count = baseQueryObject(Long.class, sql, params.toArray());
return count.intValue();
}
@Override
public int incrPageViews(int hid) {
String sql ="update news_headline set page_views = page_views + 1 where hid = ?";
return baseUpdate(sql,hid);
}
@Override
public HeadlineDetailVo findHealineDetail(int hid) {
String sql = """
select
h.hid hid ,
h.title title ,
h.article article ,
h.type type ,
t.tname typeName ,
h.page_views pageViews ,
TIMESTAMPDIFF(HOUR,h.create_time,now() )pastHours ,
h.publisher publisher ,
u.nick_name author
from
news_headline h
left join
news_type t
on
h.type = t.tid
left join
news_user u
on
h.publisher = u.uid
where
h.hid = ?
""";
List<HeadlineDetailVo> list = baseQuery(HeadlineDetailVo.class, sql, hid);
return null != list && list.size()>0 ? list.get(0):null;
}
@Override
public int addNewsHeadline(NewsHeadline newsHeadline) {
String sql = """
insert into news_headline
values (DEFAULT,?,?,?,?,0,now(),now(),0)
""";
return baseUpdate(sql,
newsHeadline.getTitle(),
newsHeadline.getArticle(),
newsHeadline.getType(),
newsHeadline.getPublisher()
);
}
@Override
public NewsHeadline findByHid(Integer hid) {
String sql = """
select
hid,
title,
article,
type,
publisher,
page_views pageViews,
create_time createTime,
update_time updateTime,
is_deleted isDeleted
from
news_headline
where
hid = ?
""";
List<NewsHeadline> list = baseQuery(NewsHeadline.class, sql, hid);
return null != list && list.size()>0?list.get(0):null;
}
@Override
public int update(NewsHeadline newsHeadline) {
String sql = """
update
news_headline
set
title = ?,
article = ?,
type = ?,
update_time = now()
where
hid = ?
""";
return baseUpdate(sql,
newsHeadline.getTitle(),
newsHeadline.getArticle(),
newsHeadline.getType(),
newsHeadline.getHid()
);
}
@Override
public int removeByHid(int hid) {
String sql = "update news_headline set is_deleted = 1 where hid = ?";
return baseUpdate(sql,hid);
}
}
NewsTypeDaoImpl实现类
public class NewsTypeDaoImpl extends BaseDao implements NewsTypeDao {
@Override
public List<NewsType> findAll() {
String sql = "select tid,tname from news_type";
return baseQuery(NewsType.class,sql);
}
}NewsUserDaoImpl实现类
public class NewsUserDaoImpl extends BaseDao implements NewsUserDao {
@Override
public NewsUser findByUsername(String username) {
String sql = """
select
uid,
username,
user_pwd userPwd,
nick_name nickName
from
news_user
where
username = ?
""";
List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, username);
return newsUserList != null && newsUserList.size()>0 ? newsUserList.get(0):null ;
}
@Override
public NewsUser findByUid(Integer userId) {
String sql = """
select
uid,
username,
user_pwd userPwd,
nick_name nickName
from
news_user
where
uid = ?
""";
List<NewsUser> newsUserList = baseQuery(NewsUser.class, sql, userId);
return newsUserList != null && newsUserList.size()>0 ? newsUserList.get(0):null ;
}
@Override
public Integer insertUser(NewsUser registUser) {
String sql = """
insert into news_user values (DEFAULT,?,?,?)
""";
return baseUpdate(sql,
registUser.getUsername(),
registUser.getUserPwd(),
registUser.getNickName()
);
}
}
service层
NewsHeadlineService接口
public interface NewsHeadlineService {
/**
*
* @param headlineQueryVo
* @return
*/
Map findPage(HeadlineQueryVo headlineQueryVo);
/**
*
* @param hid
* @return
*/
HeadlineDetailVo findHeadlineDetail(int hid);
/**
*
* @param newsHeadline
*/
int addNewsHeadline(NewsHeadline newsHeadline);
/**
*
* @param hid
* @return
*/
NewsHeadline findByHid(Integer hid);
int update(NewsHeadline newsHeadline);
/**
*
* @param hid
* @return
*/
int removeByHid(int hid);
}
NewsTypeService接口
public interface NewsTypeService {
/**
* 查询所有头条类型的方法
* @return 多个头条类型以List<NewsType>集合形式返回
*/
List<NewsType> findAll();
}
NewsUserService接口
public interface NewsUserService {
/**
* 根据用户登录的账号找用户新的方法
* @param username 用户输入的账户
* @return 找到返回NewsUser对象,找不到返回null
*/
NewsUser findByUsername(String username);
/**
*
* @param userId
* @return
*/
NewsUser findByUid(Integer userId);
/**
*
* @param registUser
* @return
*/
Integer registUser(NewsUser registUser);
}
NewsHeadlineServiceImpl实现类
public class NewsHeadlineServiceImpl implements NewsHeadlineService {
private NewsHeadlineDao headlineDao =new NewsHeadlineDaoImpl();
/*
totalPage:1,
totalSize:1
pageData:[
{
"hid":"1", // 新闻id
"title":"尚硅谷宣布 ... ...", // 新闻标题
"type":"1", // 新闻所属类别编号
"pageViews":"40", // 新闻浏览量
"pastHours":"3", // 发布时间已过小时数
"publisher":"1"
}
],
pageNum:1,
pageSize:1,
*/
@Override
public Map findPage(HeadlineQueryVo headlineQueryVo) {
int pageNum = headlineQueryVo.getPageNum();
int pageSize = headlineQueryVo.getPageSize();
List<HeadlinePageVo> pageData = headlineDao.findPageList(headlineQueryVo);
int totalSize = headlineDao.findPageCount(headlineQueryVo);
int totalPage =totalSize % pageSize ==0 ? totalSize/pageSize: totalSize/pageSize+1;
Map pageInfo= new HashMap();
pageInfo.put("pageNum",pageNum);
pageInfo.put("pageSize",pageSize);
pageInfo.put("totalSize",totalSize);
pageInfo.put("totalPage",totalPage);
pageInfo.put("pageData",pageData);
return pageInfo;
}
@Override
public HeadlineDetailVo findHeadlineDetail(int hid) {
// 修改该头条的浏览量 +1
headlineDao.incrPageViews(hid);
// 查询头条的详情
return headlineDao.findHealineDetail(hid);
}
@Override
public int addNewsHeadline(NewsHeadline newsHeadline) {
return headlineDao.addNewsHeadline(newsHeadline);
}
@Override
public NewsHeadline findByHid(Integer hid) {
return headlineDao.findByHid(hid);
}
@Override
public int update(NewsHeadline newsHeadline) {
return headlineDao.update(newsHeadline);
}
@Override
public int removeByHid(int hid) {
return headlineDao.removeByHid(hid);
}
}
NewsTypeServiceImpl实现类
public class NewsTypeServiceImpl implements NewsTypeService {
private NewsTypeDao typeDao =new NewsTypeDaoImpl();
@Override
public List<NewsType> findAll() {
return typeDao.findAll();
}
}
NewsUserServiceImpl实现类
public class NewsUserServiceImpl implements NewsUserService {
private NewsUserDao userDao =new NewsUserDaoImpl();
@Override
public NewsUser findByUsername(String username) {
return userDao.findByUsername(username);
}
@Override
public NewsUser findByUid(Integer userId) {
return userDao.findByUid(userId);
}
@Override
public Integer registUser(NewsUser registUser) {
// 处理增加数据的业务
// 将明文密码转换成密文密码
registUser.setUserPwd(MD5Util.encrypt(registUser.getUserPwd()));
return userDao.insertUser(registUser);
}
}
servlet层
NewsHeadlineController
@WebServlet("/headline/*")
public class NewsHeadlineController extends BaseController{
private NewsHeadlineService headlineService =new NewsHeadlineServiceImpl();
/**
* 删除头条业务接口 实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void removeByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
int hid = Integer.parseInt(req.getParameter("hid"));
headlineService.removeByHid(hid);
WebUtil.writeJson(resp, Result.ok(null));
}
/**
* 更新头条的业务接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void update(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);
headlineService.update(newsHeadline);
WebUtil.writeJson(resp,Result.ok(null));
}
/**
* 修改头条回显业务接口
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void findHeadlineByHid(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
Integer hid = Integer.parseInt(req.getParameter("hid"));
NewsHeadline headline =headlineService.findByHid(hid);
Map data =new HashMap();
data.put("headline",headline);
WebUtil.writeJson(resp,Result.ok(data));
}
/**
* 发布头条的接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void publish(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收参数
String token = req.getHeader("token");
Long userId = JwtHelper.getUserId(token);
NewsHeadline newsHeadline = WebUtil.readJson(req, NewsHeadline.class);
newsHeadline.setPublisher(userId.intValue());
// 将信息存入数据库
headlineService.addNewsHeadline(newsHeadline);
WebUtil.writeJson(resp, Result.ok(null));
}
}
NewsTypeController
@WebServlet("/type/*")
public class NewsTypeController extends BaseController{
}
NewsUserController
@WebServlet("/user/*")
public class NewsUserController extends BaseController{
private NewsUserService userService =new NewsUserServiceImpl();
/**
* 前端自己校验是否失去登录状态的接口
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void checkLogin(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String token = req.getHeader("token");
Result result= Result.build(null, ResultCodeEnum.NOTLOGIN);
if(null != token){
if (!JwtHelper.isExpiration(token)) {
result= Result.ok(null);
}
}
WebUtil.writeJson(resp,result);
}
/**
* 完成注册的业务接口
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void regist(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收JSON信息
NewsUser registUser = WebUtil.readJson(req, NewsUser.class);
// 调用服务层将用户信息存入数据
Integer rows =userService.registUser(registUser);
// 根据存入是否成功处理响应值
Result result =Result.ok(null);
if(rows == 0){
result=Result.build(null,ResultCodeEnum.USERNAME_USED);
}
WebUtil.writeJson(resp,result);
}
/**
* 校验用户名是否被占用的业务接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void checkUserName(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 获取账号
String username = req.getParameter("username");
// 根据用户名查询用户信息 找到了 返回505 找不到 200
NewsUser newsUser = userService.findByUsername(username);
Result result =Result.ok(null);
if(null != newsUser){
result=Result.build(null,ResultCodeEnum.USERNAME_USED);
}
WebUtil.writeJson(resp,result);
}
/**
* 根据token口令获得用户信息的接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void getUserInfo(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 获取请求中的token
String token = req.getHeader("token");
Result result = Result.build(null,ResultCodeEnum.NOTLOGIN);
if(null != token && (!"".equals(token))){
if (!JwtHelper.isExpiration(token)) {
Integer userId = JwtHelper.getUserId(token).intValue();
NewsUser newsUser =userService.findByUid(userId);
if(null != newsUser){
//通过校验 查询用户信息放入Result
Map data =new HashMap();
newsUser.setUserPwd("");
data.put("loginUser",newsUser);
result = Result.ok(data);
}
}
}
WebUtil.writeJson(resp,result);
}
/**
* 处理登录表单提交的业务接口的实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void login(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收用户名和密码
/*{
"username":"zhangsan", //用户名
"userPwd":"123456" //明文密码
}*/
NewsUser paramUser = WebUtil.readJson(req, NewsUser.class);
// 调用服务层方法 实现登录
NewsUser loginUser = userService.findByUsername(paramUser.getUsername());
Result result = null;
if(null != loginUser){
if (MD5Util.encrypt(paramUser.getUserPwd()).equalsIgnoreCase(loginUser.getUserPwd())) {
Map data =new HashMap();
data.put("token",JwtHelper.createToken(loginUser.getUid().longValue()));
result=Result.ok(data);
}else{
result=Result.build(null,ResultCodeEnum.PASSWORD_ERROR);
}
}else {
result=Result.build(null, ResultCodeEnum.USERNAME_ERROR);
}
// 向客户端响应登录验证信息
WebUtil.writeJson(resp,result);
}
}
PortalController(分页)
@WebServlet("/portal/*")
public class PortalController extends BaseController{
private NewsTypeService typeService =new NewsTypeServiceImpl();
private NewsHeadlineService headlineService =new NewsHeadlineServiceImpl();
/**
* 查询头条详情的业务接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void showHeadlineDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收要查询头条的hid
int hid = Integer.parseInt(req.getParameter("hid"));
// 调用服务层完成查询处理
HeadlineDetailVo headlineDetailVo =headlineService.findHeadlineDetail(hid);
// 将查到的信息响应给客户端
Map data =new HashMap();
data.put("headline",headlineDetailVo);
WebUtil.writeJson(resp, Result.ok(data));
}
/**
* 分页查询头条信息的接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void findNewsPage(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 接收请求中的参数
HeadlineQueryVo headlineQueryVo = WebUtil.readJson(req, HeadlineQueryVo.class);
// 将参数传递给服务层 进行分页查询
/*
* pageData:[
* {
* "hid":"1", // 新闻id
"title":"尚硅谷宣布 ... ...", // 新闻标题
"type":"1", // 新闻所属类别编号
"pageViews":"40", // 新闻浏览量
"pastHours":"3", // 发布时间已过小时数
"publisher":"1"
* }
*
* ],
* pageNum:1,
* pageSize:1,
* totalPage:1,
* totalSize:1
*
*
* */
Map pageInfo =headlineService.findPage(headlineQueryVo);
Map data =new HashMap();
data.put("pageInfo",pageInfo);
// 将分页查询的结果转换成json响应给客户端
WebUtil.writeJson(resp,Result.ok(data));
}
/**
* 查询所有头条类型的业务接口实现
* @param req
* @param resp
* @throws ServletException
* @throws IOException
*/
protected void findAllTypes(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 查询所有的新闻类型,装入Result响应给客户端
List<NewsType> newsTypeList= typeService.findAll();
WebUtil.writeJson(resp,Result.ok(newsTypeList));
}
}