SSM整合

Posted 2021-03-11 jzfanqiejiang

学完SSM就要整合一下嘛，

开始：

1、新建maven项目：

 

 

 

2、先导入springmvc的依赖包

 <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

2.1再导入mybatis

 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.19</version>
        </dependency>

3，创建包，分别为pojo，controller，service，mapper，utile这五个层，根据个人增加多少个无所谓

 

 

 

4,先在pojo层创建一个类作为mybatis的映射类名为UserPojo

package com.ssmtest.pojo;

public class UserPojo {

    private int id;
    private String username;
    private String password;

    public UserPojo() {
    }

    public UserPojo(int id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "UserPojo{" +
                "id=" + id +
                ", username=‘" + username + ‘‘‘ +
                ", password=‘" + password + ‘‘‘ +
                ‘}‘;
    }
}

5、mapper层：

　　UserMapper接口：

　　　　

package com.ssmtest.mapper;

import com.ssmtest.pojo.UserPojo;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface UserMapper {
    //增
    int insertUser(UserPojo user);
    //删
    int deletUser(@Param("userid") int id);
    //改
    int updateUser(UserPojo user);
    //查
    UserPojo selectUser(@Param("userid")int id);
    //查看全部
    List<UserPojo> selectUserAll();
}

 

UserMapper.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ssmtest.mapper.UserMapper">

    <insert id="insertUser" parameterType="userpojo">
         insert into mybatis.login_user(id,username, password) values (#{id},#{username},#{password});
    </insert>

    <delete id="deletUser" parameterType="_int">
        delete from mybatis.login_user where username = #{userid}
    </delete>

    <update id="updateUser" parameterType="userpojo">
        update mybatis.user set name=#{username},pwd=#{password} where id=#{id};
    </update>

    <select id="selectUser" parameterType="_int">
        select * from mybatis.login_user where id=#{userid}
    </select>

    <select id="selectUserAll" resultType="userpojo">
        select * from mybatis.login_user
    </select>
</mapper>

 

mybatis配置文件:

<?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>
    <typeAliases>
        <package name="com.ssmtest.pojo"/>
    </typeAliases>

    <mappers>
        <mapper resource="com/ssmtest/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

 

5.1、先创建一个总的spring文件名为applicationContext：

注意一定要点Create new application context，要不然不能汇总，别的spring配置文件不能相互使用

 

 

 

5.2、创建db.properties数据库的配置文件

 

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&UseUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
user=自己的账号
pass=自己的密码

 

5.3、创建springmapper配置文件：

一定要加入到刚才的applicationContext里

 

 

 配置文件：

<?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"
       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">

    <!--读取db.properties数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--开启注解-->
    <context:component-scan base-package="com.ssmtest.mapper"/>

    <!--设置MySQL连接池-->
    <bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" id="dataSource">
        <property name="driverClassName" value="${driver}"/>
        <property name="url" value="${url}"/>
        <property name="username" value="${user}"/>
        <property name="password" value="${pass}"/>
    </bean>
    <!--这个就是mybatis里的SqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis配置文件-->
        <property name="configLocation" value="classpath:Mybatisconfig.xml"/>
    </bean>

    <!--自动扫描 将Mapper接口生成代理注入到Spring-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ssmtest.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
</beans>

 

 

 6，配置service层：

创建UserService接口：

package com.ssmtest.service;

import com.ssmtest.pojo.UserPojo;

import java.util.List;

public interface UserService {
    //增
    int insertUser(UserPojo user);
    //删
    int deletUser(int id);
    //改
    int updateUser(UserPojo user);
    //查
    UserPojo selectUser(int id);
    //查看全部
    List<UserPojo> selectUserAll();
}

实现UserService接口:

package com.ssmtest.service;

import com.ssmtest.mapper.UserMapper;
import com.ssmtest.pojo.UserPojo;

import java.util.List;

public class UserServicelmpl implements UserService {

    //调用mapper层
    private UserMapper userMapper;

    public void setUserMapper(UserMapper userMapper) {
        this.userMapper = userMapper;
    }

    public int insertUser(UserPojo user) {
        return userMapper.insertUser(user);
    }

    public int deletUser(int id) {
        return userMapper.deletUser(id);
    }

    public int updateUser(UserPojo user) {
        return userMapper.updateUser(user);
    }

    public UserPojo selectUser(int id) {
        return userMapper.selectUser(id);
    }

    public List<UserPojo> selectUserAll() {
        return userMapper.selectUserAll();
    }
}

配置service层的spring配置文件：

<?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"
       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">

    <context:component-scan base-package="com.ssmtest.service"/>
    <bean class="com.ssmtest.service.UserServicelmpl" id="UserServicelmpl">
        <!--重点把usermapper从springmapper.xml里拿到usermapper接口的实现类注入到service层里面-->
        <property name="userMapper" ref="userMapper"/>
    </bean>
</beans>

 

测试一下，看一下spring整合mybatis是否成功：

先在applicationContext.xml中导入springservice和springmapper文件：

 

 

 

测试：

 

 

 

结果：

 

 

 查出来了，说明spring整合mybatis成功，就剩下整合springmvc了

7，Controller层：

先把项目改查web项目：

 

 

配置web.xml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">
    
    <servlet>
        <servlet-name>SSMTEST</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--绑定applicationContext配置文件-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--拦截请求-->
    <servlet-mapping>
        <servlet-name>SSMTEST</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

新建springmvc配置文件：

<?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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.ssmtest.controller"/>
    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"/>

</beans>

在配置UserController类

 

package com.ssmtest.controller;

import com.ssmtest.pojo.UserPojo;
import com.ssmtest.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
public class UserController {
    //调用service层
    @Autowired
    @Qualifier("UserServicelmpl")
    private UserService userService;

    @RequestMapping("/hello")
    public String hello(Model model){
        List<UserPojo> userPojos = userService.selectUserAll();
        model.addAttribute("hello",userPojos);
        return "hello";
    }
}

在idea中添加lib，springmvc支持的jar包这样才能启动成功：

 

 测试：

 

 

成功!