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SSM整合——基于 IDEA Maven项目的 Spring + SpringMVC + MyBatis MVC架构整合

零、源代码

源代码已上传至 GitHub:callmePicacho
建议搭配源代码使用
参考视频:
Mybatis教程IDEA版-4天-2018黑马SSM-01
Spring教程IDEA版-4天-2018黑马SSM-02
SpringMVC教程IDEA版-3天-2018黑马SSM-03

一、说明

1. 需求分析

  1. 从数据库读数据到前台
  2. 从前台插入数据到数据库

2. 效果图

3. 整合思路

  1. 先搭建整合环境
  2. 搭建 Spring 配置
  3. 使用 Spring 整合 SpringMVC
  4. 使用 Spring 整合 MyBatis

4. 环境

  • IDE:IntelliJ IDEA 2018.1.3
  • JDK:9.0.4
  • Maven:3.6.1
  • Tomcat:9.0.8
  • Mysql:5.1.6
  • Spring:5.0.2.RELEASE
  • spring-web:5.0.2.RELEASE
  • MyBatis:3.4.5

5. 架构

  • Spring 作为业务层,整合 SpringMVC 和 MyBatis,处理数据
  • SpringMVC 作为表现层,显示数据
  • MyBatis 作为持久层,与数据库交互

二、搭建整合环境

0. 目标

  1. 数据库和表创建完成
  2. Maven 项目创建完成,并导入坐标
  3. MVC 架构创建完成
  4. xml 配置文件创建完成
  5. tomcat 服务器配置完成,并成功运行

0.1 目录结构

1. 创建数据库和表

CREATE DATABASE ssm;
USE ssm;
CREATE TABLE user(
	id int primary key auto_increment,
	name varchar(20),
	age int 
);
INSERT INTO user(name,age) VALUES('aaa',12);
INSERT INTO user(name,age) VALUES('bbb',34);
INSERT INTO user(name,age) VALUES('ccc',56);

2. 搭建 Maven 项目

  1. 创建 maven 项目
    IDEA搭建Maven Web
  2. 在 pom.xml 文件中引入坐标依赖
    pom.xml 中,properties 标签改为:
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <spring.version>5.0.2.RELEASE</spring.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <mysql.version>5.1.6</mysql.version>
        <mybatis.version>3.4.5</mybatis.version>
    </properties>
    
    dependencies 标签改为:
    <dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    
  3. 在 main 目录下创建 java 目录和 resources 目录

    并分别标记为 Sources Root 和 Resources Root

3. 创建类和配置文件

  1. 在 java 目录下创建多个类

    • 创建user实体类 org.lyy.entity.User
      package org.lyy.entity;
      
      public class User {
      
          private Integer id;
          private String name;
          private Integer age;
      
          public Integer getId() {
              return id;
          }
      
          public void setId(Integer id) {
              this.id = id;
          }
      
          public String getName() {
              return name;
          }
      
          public void setName(String name) {
              this.name = name;
          }
      
          public Integer getAge() {
              return age;
          }
      
          public void setAge(Integer age) {
              this.age = age;
          }
      	@Override
          public String toString() {
              return "User{" +
                      "id=" + id +
                      ", name='" + name + '\'' +
                      ", age=" + age +
                      '}';
          }
      }
      
    • 创建dao接口 org.lyy.dao.UserDao
      package org.lyy.dao;
      
      import org.lyy.entity.User;
      
      import java.util.List;
      
      public interface UserDao {
      
          public void insertUser(User user);
      
          public List<User> queryAll();
      }
      
    • 创建service接口 org.lyy.service.UserService
      package org.lyy.service;
      
      import org.lyy.entity.User;
      
      import java.util.List;
      
      public interface UserService {
      
          public void insertUser(User user);
      
          public List<User> queryAll();
      }
      
    • 创建service实现类,继承service接口 org.lyy.service.impl.UserServiceImpl
      package org.lyy.service.impl;
      
      import org.lyy.entity.User;
      import org.lyy.service.UserService;
      
      import java.util.List;
      
      public class UserServiceImpl implements UserService {
      
          @Override
          public void insertUser(User user) {
              System.out.println("service插入数据");
          }
      
          @Override
          public List<User> queryAll() {
              System.out.println("service查询全部数据");
              return null;
          }
      }
      
  2. 在 resources 目录下创建多个配置文件

    • 创建applicationContext.xml ,存放 Spring 相关配置
      <?xml version="1.0" encoding="UTF-8"?>
      <beans xmlns="http://www.springframework.org/schema/beans"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:context="http://www.springframework.org/schema/context"
             xmlns:aop="http://www.springframework.org/schema/aop"
             xmlns:tx="http://www.springframework.org/schema/tx"
             xsi:schemaLocation="http://www.springframework.org/schema/beans
      	   http://www.springframework.org/schema/beans/spring-beans.xsd
      	   http://www.springframework.org/schema/context
      	   http://www.springframework.org/schema/context/spring-context.xsd
      	   http://www.springframework.org/schema/aop
      	   http://www.springframework.org/schema/aop/spring-aop.xsd
      	   http://www.springframework.org/schema/tx
      	   http://www.springframework.org/schema/tx/spring-tx.xsd">
      
      
      </beans>
      
    • 创建log4j.properties,存放日志相关配置
      # Set root category priority to INFO and its only appender to CONSOLE.
      #log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
      log4j.rootCategory=info, CONSOLE, LOGFILE
      
      # Set the enterprise logger category to FATAL and its only appender to CONSOLE.
      log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE
      
      # CONSOLE is set to be a ConsoleAppender using a PatternLayout.
      log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
      log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
      log4j.appender.CONSOLE.layout.ConversionPatern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
      t
      # LOGFILE is set to be a File appender using a PatternLayout.
      log4j.appender.LOGFILE=org.apache.log4j.FileAppender
      log4j.appender.LOGFILE.File=d:\axis.log
      log4j.appender.LOGFILE.Append=true
      log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
      log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
      
    • 创建springmvc.xml,存放 SpringMVC 相关配置
      <?xml version="1.0" encoding="UTF-8"?>
      <beans xmlns="http://www.springframework.org/schema/beans"
             xmlns:mvc="http://www.springframework.org/schema/mvc"
             xmlns:context="http://www.springframework.org/schema/context"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.springframework.org/schema/beans 
             http://www.springframework.org/schema/beans/spring-beans.xsd 
             http://www.springframework.org/schema/mvc 
             http://www.springframework.org/schema/mvc/spring-mvc.xsd 
             http://www.springframework.org/schema/context 
             http://www.springframework.org/schema/context/spring-context.xsd">
      
      </beans>
      
    • 创建SqlMapConfig.xml,存放 MyBatis 相关配置
      <?xml version="1.0" encoding="UTF-8"?>
      <!DOCTYPE configuration
              PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
              "http://mybatis.org/dtd/mybatis-3-config.dtd">
      <configuration>
      
      
      </configuration>
      

4. 部署项目到 tomcat 服务器

  1. 打开 Edit Configurations
  2. 添加 tomcat 服务器
  3. 配置 tomcat 服务器


  4. 运行服务器,测试服务器是否成功部署

三、搭建和测试 Spring

0. 目录结构

1. 完善 applicationContext.xml

<!-- 配置扫描器,spring管理的是service和dao层的注解,controller注解交给springmvc管理 -->
<context:component-scan base-package="org.lyy">
    <!-- 配置要忽略的注解 -->
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

2. 编写测试类

  1. 为 UserServiceImpl 类添加注解
    @Service("userService")
    public class UserServiceImpl implements UserService{
    	...
    }
    
  2. 编写测试类 org.lyy.test.ServiceTest
    package org.lyy.test;
    
    import org.junit.Test;
    import org.lyy.service.UserService;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class ServiceTest {
    
        @Test
        public void run(){
            // 获取context上下文对象
            ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
            // 得到 service 对象
            UserService service = (UserService)context.getBean("userService");
            // 调用测试
            service.queryAll();
        }
    }
    

3. 测试 spring 框架

运行 run 方法,测试 spring 是否搭建成功

四、搭建和测试 springMVC

0. 目录结构

1. 完善 web.xml

  1. 配置过滤器,解决中文乱码问题
  2. 配置DispatcherServlet前端控制器
<!-- 配置过滤器,解决中文乱码问题-->
<filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!-- 字符集初始化为 UTF-8 -->
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 配置DispatcherServlet前端控制器-->
<servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <!-- 加载 springmvc.xml -->
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:springmvc.xml</param-value>
     </init-param>
     <!-- 启动服务器,加载该servlet -->
     <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
     <servlet-name>dispatcherServlet</servlet-name>
     <url-pattern>/</url-pattern>
 </servlet-mapping>

2. 完善 springmvc.xml

  1. 配置注解扫描器,只扫描 controller
  2. 配置视图解析器,控制 controller 跳转到 “/WEB-INF/pages/” 目录下,以 “xxx.jsp” 结尾的文件
  3. 开启对 springMVC 注解的支持
<!-- 扫描Controller的注解-->
 <context:component-scan base-package="org.lyy">
     <!-- 只扫描 controller-->
     <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
 </context:component-scan>

 <!-- 配置视图解析器 -->
 <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="prefix" value="/WEB-INF/pages/"/>
     <property name="suffix" value=".jsp"/>
 </bean>

 <!-- 开启对SpringMVC注解的支持 -->
 <mvc:annotation-driven/>

3. 编写测试类

  1. 创建UserController类 org.lyy.controller.UserController
    package org.lyy.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    @RequestMapping("/user")
    public class UserController {
    
        @RequestMapping("queryAll")
        public String  queryAll(){
            System.out.println("controller查询全部数据");
            return "success";
        }
    
    }
    
  2. index.jsp 添加超链接,跳转访问 UserController 的 queryAll 方法
    <%@ page contentType="text/html;charset=UTF-8" language="java"%>
    <html>
    <body>
    <a href="/user/queryAll">查询测试</a>
    </body>
    </html>
    
    报 404 的话将路径改为 “./user/queryAll”,感谢 @信管亲爸 同学补充
  3. WEB-INF 目录下新建 pages 目录,pages 目录下创建 success.jsp 页面,编写 success.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <h1>跳转成功</h1>
    </body>
    </html>
    

4. 测试 SpringMVC 框架

运行 tomcat 服务器,点击超链接看页面是否正常跳转,验证 SpringMVC 是否搭建成功

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener 错误的解决办法

五、Spring 整合 SpringMVC

0. 目录结构

1. 目的

在 controller 中能成功调用 service 对象中的方法

2. 修改 web.xml

配置 ContextLoaderListener 监听器,使项目在启动时就去加载applicationContext.xml的配置文件

<!-- 设置加载类路径的配置文件-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>
 <!-- 配置 spring 的监听器,默认只加载 WEB-INF 目录下的 applicationContext.xml 配置文件 -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

注意:web.xml 中的文件配置有先后顺序,代码直接贴上去可能会报错,所以需要修改配置顺序,修改后的 web.xml :

<!-- 设置加载类路径的配置文件-->
 <context-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:applicationContext.xml</param-value>
 </context-param>

 <!-- 配置过滤器,解决中文乱码问题-->
 <filter>
     <filter-name>characterEncodingFilter</filter-name>
     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
     <!-- 字符集初始化为 UTF-8 -->
     <init-param>
         <param-name>encoding</param-name>
         <param-value>UTF-8</param-value>
     </init-param>
 </filter>
 <filter-mapping>
     <filter-name>characterEncodingFilter</filter-name>
     <url-pattern>/*</url-pattern>
 </filter-mapping>

 <!-- 配置 spring 的监听器,默认只加载 WEB-INF 目录下的 applicationContext.xml 配置文件 -->
 <listener>
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

 <!-- 配置DispatcherServlet前端控制器-->
 <servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <!-- 加载 springmvc.xml -->
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:springmvc.xml</param-value>
     </init-param>
     <!-- 启动服务器,加载该servlet -->
     <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
     <servlet-name>dispatcherServlet</servlet-name>
     <url-pattern>/</url-pattern>
 </servlet-mapping>

3. 修改 UserController

在controller中注入service对象,调用service对象的方法进行测试

package org.lyy.controller;

import org.lyy.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/queryAll")
    public String  queryAll(){
        System.out.println("controller查询全部数据");
        // 调用注入的 userService 调用 queryAll 方法
        userService.queryAll();
        return "success";
    }

}

4. 测试 Spring 是否整合 SpringMVC

当点击超链后,userService 调用 queryAll 方法能成功在控制台输出"service查询全部数据"说明整合成功

六、搭建和测试 MyBatis

0. 目录结构

1. 完善 SqlMapConfig.xml

添加数据源配置信息和引入映射文件

<!-- 配置环境 -->
<environments default="mysql">
    <environment id="mysql">
        <transactionManager type="JDBC"/>
        <dataSource type="POOLED">
            <property name="driver" value="com.mysql.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/ssm"/>
            <property name="username" value="root"/>
            <property name="password" value="root"/>
        </dataSource>
    </environment>
</environments>

<!-- 引入映射文件 -->
<mappers>
    <package name="org.lyy.dao"/>
</mappers>

报错Cause: org.xml.sax.SAXParseException lineNumber: 2; columnNumber: 16; 文档根元素 " 的解决方案

2. 完善 UserDao

为方法添加注解

package org.lyy.dao;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.lyy.entity.User;

import java.util.List;

public interface UserDao {

    @Insert("insert into user(name,age) values(#{name},#{age})")
    public  void insertUser(User user);

    @Select("select * from user")
    public List<User> queryAll();
}

3. 编写测试类

创建 DaoTest 类,并写入 testQueryAll 和 testInsert 测试方法对查询和插入进行测试

package org.lyy.test;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import org.lyy.dao.UserDao;
import org.lyy.entity.User;

import java.io.InputStream;
import java.util.List;

public class DaoTest {

    // 测试 queryAll
    @Test
    public void testQueryAll() throws Exception {
        // 加载配置文件
        InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
        // 创建工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        // 创建 sqlSession 对象
        SqlSession session = factory.openSession();
        // 获取代理对象
        UserDao dao = session.getMapper(UserDao.class);
        // 调用 queryAll
        List<User> users = dao.queryAll();
        for (User user : users) {
            System.out.println(user.getId() + " " + user.getName() + " " + user.getAge());
        }
        // 释放资源
        session.close();
        is.close();
    }

    // 测试 insert
    @Test
    public void testInsert() throws Exception {
        // 加载配置文件
        InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
        // 创建工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        // 创建 sqlSession 对象
        SqlSession session = factory.openSession();
        // 获取代理对象
        UserDao dao = session.getMapper(UserDao.class);

        // 创建 User 对象
        User user = new User();
        user.setName("fff");
        user.setAge(18);
        dao.insertUser(user);

        // 提交事务
        session.commit();

        // 释放资源
        session.close();
        is.close();
    }

}

4. 检测 MyBatis 是否搭建成功

  1. 右键 run testQueryAll(),查看输出窗口是否查询到 user 数据
  2. 右键 run testInsert() 后再 run testQueryAll(),查看输出窗口数据是否被插入

Mybatis遇到No constructor found in …的解决方法

七、Spring 整合 MyBatis

0. 目录结构

1. 目的

把 MyBatis 的数据源,SqlSession 和 dao 都交给 spring 管理

2. 完善 applicationContext.xml

  1. 把 SqlMapConfig.xml 配置文件中的内容配置到 applicationContext.xml 配置文件中
  2. 删除 SqlMapConfig.xml
    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm"/>
        <property name="user" value="root"/>
        <property name="password" value="root"/>
    </bean>
    
    <!-- 配置 SqlSession 工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 引入数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    
    <!-- 配置 Dao 接口所在类-->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.lyy.dao"/>
    </bean>
    

3. 修改 UserDao 类

为 UserDao 添加 @Repository 注解

@Repository
public interface UserDao{
	... 
}

4. 修改 UserServiceImpl 类

在 UserServiceImpl 类中注入 dao 对象,dao 对象执行相应方法

package org.lyy.service.impl;

import org.lyy.dao.UserDao;
import org.lyy.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.lyy.service.UserService;

import java.util.List;


@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao dao;

    @Override
    public void insertUser(User user) {
        System.out.println("service插入数据");
        dao.insertUser(user);
    }

    @Override
    public List<User> queryAll() {
        System.out.println("service查询全部数据");
        return dao.queryAll();
    }
}

5. 修改 UserController.java

将从数据库查到的数据放入 Model 对象

package org.lyy.controller;

import org.lyy.entity.User;
import org.lyy.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/queryAll")
    public String queryAll(Model model) {
        System.out.println("controller查询全部数据");
        // 调用注入的 userService 调用 queryAll 方法
        List<User> users = userService.queryAll();
        // 将 users 放入 users
        model.addAttribute("users",users);
        return "success";
    }

    @RequestMapping("/insert")
    public String insert(User user) {
        System.out.println("controller插入数据");
        // 调用注入的 userService 调用 insert 方法
        userService.insertUser(user);
        return "success";
    }
}

6. 修改 index.jsp

  1. 提交表单插入数据
  2. 点击超链接查询数据
<%@ page contentType="text/html;charset=UTF-8" language="java"%>
<html>
<body>
    <a href="/user/queryAll">查询全部数据</a>
    <br>
    <form method="post" action="/user/insert">
        姓名:<input type="text" name="name"><br>
        年龄:<input type="text" name="age"><br>
        <input type="submit" value="插入表单数据"><br>
    </form>
</body>
</html>

7. 修改 success.jsp

添加展示数据

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>跳转成功</h1>
    ${users}
</body>
</html>

8. 整合完成

至此,Spring 整合 SpringMVC、MyBatis 完成
谢谢您能看到这,点个赞再走吧~

八、布置项目到阿里云

请移步:布置 SSM 项目到阿里云

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