Bootstrap

SSM整合(二)-增删改查(CURD)

SSM整合(二)

1.整合思路

SSM框架工作时,Spring、Spring MVC和MyBatis的分工如下。
(1)Spring负责事务管理,可以管理数据持久层的Mapper Bean和业务逻辑层的Service Bean。由于Mapper Bean和Service Bean都在Spring容器中,因此在业务逻辑层可以直接调用Mapper Bean。
(2)Spring MVC负责管理表现层的Controller Bean。由于Spring MVC容器是Spring容器的子容器,因此在表现层可以调用Spring容器中的Service Bean。
(3)MyBatis负责与数据库交互。

img

根据上述的分工描述,SSM框架的整合思路如下。
(1)搭建项目环境。首先在数据库中搭建项目对应的数据库环境,然后创建Web项目,并引入项目所需的依赖包。
(2)创建接口和类。首先创建实体类,然后创建数据持久层对应的接口或映射文件、业务逻辑层对应的接口及其实现类和表现层对应的控制器类。
(3)创建视图文件。创建表现层对应的视图文件,在浏览器中展示执行操作的结果。
(4)整合Spring和MyBatis。创建Spring的配置文件,配置Spring的相关信息,然后配置MyBatis的数据源信息和与MyBatis相关的Bean。
(5)整合Spring和Spring MVC。创建Spring MVC的配置文件,配置Spring MVC的相关信息,并在项目的web.xml文件中加载Spring和Spring MVC的配置文件。

2.搭建项目:

创建包:

控制层:controller

服务层:service

持久层:dao

实体类:domain

工具类:utils

在这里插入图片描述

3.导入jar包

<dependencies>
    <!--单元测试-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <!--spring-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.3.30</version>
    </dependency>
    <!--spring mvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.30</version>
    </dependency>
    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.4</version>
    </dependency>
    <!--spring 整合 mybatis 的 jar-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.4</version>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.28</version>
    </dependency>
    <!--数据库连接池-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.2.6</version>
    </dependency>
    <!--lombok-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.32</version>
    </dependency>
    <!--jdbc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.30</version>
    </dependency>
  </dependencies>

4.准备测试数据

4.1创建数据库、表
DROP TABLE IF EXISTS `tb_student`;
CREATE TABLE `tb_student` (
  `id` int NOT NULL AUTO_INCREMENT,
  `stu_name` varchar(20) COLLATE utf8_bin NOT NULL,
  `stu_pwd` varchar(20) COLLATE utf8_bin NOT NULL,
  `stu_email` varchar(20) COLLATE utf8_bin NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin;

-- ----------------------------
-- Records of tb_student
-- ----------------------------
INSERT INTO `tb_student` VALUES ('3', '李白', '123', 'libai@123');
INSERT INTO `tb_student` VALUES ('4', '杜甫', '456', 'dufu@123');

4.2编写实体类
@Data
public class Student {
    private Integer id;
    private String stuName;
    private String stuPwd;
    private String stuEmail;
}

5.编写dao层的代码

@Repository
public interface StudentDao {
     //查询所有的方法
    @Select("select * from tb_student")
    public List<Student> queryAll();
    //添加
    @Insert("insert into tb_student values (null,#{stuName},#{stuPwd},#{stuEmail})")
    public int addStudent(Student stu);
    //删除
    @Delete("delete from tb_student where id = #{id}")
    public int delStudent(int id);
    //修改@Update()
    public int updateStudent(Student stu);
    @Select("select * from tb_student where id = #{id}")
    public Student findById(int id);
}

6.编写service层

6.1编写接口(定义规范)
public interface StudentService {
    //查询所有的方法
    public List<Student> findAll();
    //添加
    public boolean addStudent(Student stu);
    //删除
    public boolean delStudent(int id);
    //修改
    public boolean updateStudent(Student stu);

    public Student findById(int id);

}
6.2实现接口
@Service
public class StudentServiceImpl implements StudentService {
     //注入 dao层的对象
    @Autowired  //自动类型注入
    StudentDao studentDao;
    public List<Student> findAll() {
        //调用dao层的方法
        List<Student> students = studentDao.queryAll();

        return students;
    }
	//添加
    public boolean addStudent(Student stu) {
        return studentDao.addStudent(stu) >0;
    }
	//删除
    public boolean delStudent(int id) {
        return studentDao.delStudent(id)>0;
    }
	//修改
    public boolean updateStudent(Student stu) {
        return studentDao.updateStudent(stu)>0;
    }
	//通过Id查询
    public Student findById(int id) {
        return studentDao.findById(id);
    }
}

7.编写controller

//controller---service----->dao
@Controller
public class StudentController {
    //自动类型注入--- 多态
    @Autowired
    StudentService studentService;
    @RequestMapping("list")
    public String  list(Model model){
        System.out.println(123);
        //调用service
        List<Student> all = studentService.findAll();
        //存数据
        model.addAttribute("all",all);
        //跳转页面
        return "list";
    }
    @RequestMapping("add")
    public String add(Student student){
        //调用service
        boolean b = studentService.addStudent(student);
        return "redirect:list";
    }
    //删除
    @RequestMapping("del/{id1}")
    public String  del(@PathVariable("id1") int id){
        boolean b = studentService.delStudent(id);
        return "redirect:/list";
    }
    //通过Id查询用户
    @RequestMapping("findById")
    public String  findById(int id,Model model){
        Student student = studentService.findById(id);
        model.addAttribute("stu",student);
        //转发到修改的页面
        return "updateJsp";
    }
    //修改的方法
    @RequestMapping("updateStdent")
    public String updateStdent(Student student){
        boolean b = studentService.updateStudent(student);
        return "redirect:list";
    }
}

8.编写springmvc的配置文件

<?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">
    <!--包扫描-->
    <context:component-scan base-package="com.yngm.ssm.controller"/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--注解驱动-->
    <mvc:annotation-driven/>
    
</beans>

9.编写spring的配置文件

9.1数据源属性文件(db.properties)
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis_db
jdbc.username=root
jdbc.pwd=abc123
<?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">
    <!--包扫描,除了controller的包,都需要扫描-->
    <context:component-scan base-package="com.yngm.ssm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!--引入属性文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--配置数据源-->
    <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
        <!--驱动-->
        <property name="driverClassName" value="${jdbc.driver}"/>
        <!--路径-->
        <property name="url" value="${jdbc.url}"/>
        <!--用户名-->
        <property name="username" value="${jdbc.username}"/>
        <!--密码-->
        <property name="password" value="${jdbc.pwd}"/>
    </bean>
    <!--配置sqlSession对象-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--加载数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--读取映射文件-->
        <property name="mapperLocations" value="classpath:com/yngm/ssm/mapper/*.xml"/>
        <!--配置类型别名-->
        <property name="typeAliasesPackage" value="com.yngm.ssm.domain"/>
		<!--配置开启驼峰命名-->
        <property name="configuration">
            <bean class="org.apache.ibatis.session.Configuration">
                <!--开启驼峰命名-->
                <property name="mapUnderscoreToCamelCase" value="true"/>
            </bean>
        </property>
    </bean>
    <!--配置dao层接口的代理对象-扫描dao层的包-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.yngm.ssm.dao"/>
    </bean>
</beans>

10.编写映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.yngm.ssm.dao.StudentDao">
   <!--修改  动态sql-->
    <update id="updateStudent">
        update tb_student
        <set>
            <if test="stuName!=null">
                stu_name=#{stuName},
            </if>
            <if test="stuPwd!=null">
                stu_pwd=#{stuPwd},
            </if>
            <if test="stuEmail!=null">
                stu_email=#{stuEmail},
            </if>
        </set>
        where id=#{id}
    </update>
</mapper>

11.编写web.xml

加载spring和springmvc的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--监听器,读spring的配置文件-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--配置Spring容器,指定Spring的配置文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:app.xml</param-value>
    </context-param>


    <!--前端控制器-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
     <!--字符编码过滤器-->
     <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

12.编写页面,启动项目

12.1首页
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<body>
<h2>理论+实践!SSM整合成功!</h2>
<a href="list">查询所有</a>

<form action="add" method="post">
    账号:<input type="text" name="stuName" /> <br>
    密码: <input type="text" name="stuPwd" /> <br>
    邮箱: <input type="text" name="stuEmail" /> <br>
    <input type="submit" value="提交">
</form>
</body>
</html>

在这里插入图片描述

12.2.展示数据
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%--接收后台的数据 使用表格展示 --%>
<table border="1" cellspacing="0">
    <tr>
        <th>编号</th>
        <th>用户名</th>
        <th>密码</th>
        <th>邮箱</th>
        <th>操作</th>
    </tr>
    <c:forEach items="${all}" var="stu">
        <tr>
            <td>${stu.id}</td>
            <td>${stu.stuName}</td>
            <td>${stu.stuPwd}</td>
            <td>${stu.stuEmail}</td>
            <td>
                <a href="del/${stu.id}">删除</a>
                <a href="findById?id=${stu.id}">修改</a>
            </td>
        </tr>
    </c:forEach>
</table>

</body>
</html>

在这里插入图片描述

12.3.修改页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>修改数据</h1>
<form action="updateStdent" method="post">
    <input type="hidden" name="id" value="${stu.id}">
    账号:<input type="text" name="stuName" value="${stu.stuName}" /> <br>
    密码: <input type="text" name="stuPwd" value="${stu.stuPwd}" /> <br>
    邮箱: <input type="text" name="stuEmail" value="${stu.stuEmail}" /> <br>
    <input type="submit" value="提交">
</form>

</body>
</html>

在这里插入图片描述

;