SSM整合 xml配置+注解实现

SSM整合

前言:

当我闷学完spring、springMVC、MyBatis之后，该做什么呢？是要立马去找一个项目去做吗？还是继续学习下一个阶段？都不是，我们应该去整合SSM各个框架。

接下来我们就开始准备SSM的整合。整合的方式采用注解配合xml配置文件进行整合，这样既没有纯配置文件的繁琐，也没有纯注解方式的难以理解。这样的整合方式是我个人来说比较愿意去是采用的一种方式

准备工作

项目结构

导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.feng</groupId>
    <artifactId>ssmBulidAnno</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--依赖：junit，数据库驱动，连接池：c3p0，servlet，jsp，mybatis，spring-mybatis，spring-->
    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>
        <!--aop-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
    </dependencies>

    <!--静态资源导出-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>


</project>

idea链接数据库（可选）

这里数据库里只有一条简单的信息

数据库配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

Spring整合dao层

实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

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

我们的业务是，查询数据库中的用户信息。

Mapper层：

@Repository
@Mapper
public interface UserMapper {

    User selectUser(@Param("username") String username, @Param("password") String password);
}

对应的Mapper配置文件：

<?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.feng.mapper.UserMapper">

    <select id="selectUser" resultType="User">
        select * from ssmbuild.user where username='${username}' and password='${password}'
    </select>
</mapper>

MyBatis.xml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>

    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
    
    <typeAliases>
        <package name="com.feng.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.feng.mapper.UserMapper"/>
    </mappers>

</configuration>

Spring-dao.xml：

<?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 https://www.springframework.org/schema/context/spring-context.xsd">

<!--1.关联数据库配置文件-->
<context:property-placeholder location="classpath:database.properties"/>
<context:component-scan base-package="com.feng.mapper"></context:component-scan>

<!--2.连接池-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>

    <!-- c3p0连接池的私有属性 -->
    <property name="maxPoolSize" value="30"/>
    <property name="minPoolSize" value="10"/>
    <!-- 关闭连接后不自动commit -->
    <property name="autoCommitOnClose" value="false"/>
    <!-- 获取连接超时时间 -->
    <property name="checkoutTimeout" value="10000"/>
    <!-- 当获取连接失败重试次数 -->
    <property name="acquireRetryAttempts" value="2"/>
</bean>

<!--3.sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>


<!--这段代码 == 在server层中加上 @MapperScan("com.feng.mapper")这个注解-->
<!--<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">-->
<!--    <property name="basePackage" value="com.feng.mapper"/>-->
<!--</bean>-->

</beans>

下面这段代码十分重要，如果没有这个配置或者在在server层中也没有这个注解就会导致bean注入失败@MapperScan。在这里，本人是采用注解形式进行配置的。

作用：扫描dao层接口，实现dao接口注入到Spring容器中

<!--这段代码 == 在server层中加上 @MapperScan("com.feng.mapper")这个注解-->
<!--<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">-->
<!--    <property name="basePackage" value="com.feng.mapper"/>-->
<!--</bean>-->

到了这一步，我们的Spring——dao层差不多整合完毕，此时我们可以试一试时候整合成功。

测试:

@Test
public void test1()
{
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserMapper userMapper = (UserMapper) context.getBean("userMapper");

    User user = userMapper.selectUser("admin", "123456");
    System.out.println(user);

}

通过控制台打印的信息，我们可以看到整合成功。

Spring整合service层

业务层接口UserService

package com.feng.service;

import com.feng.pojo.User;

public interface UserService {

    //根据用户名和密码查询用户

    public User selectUser(String username, String password);
    public void show();
}

业务层实现类UserServiceImpl

package com.feng.service;


import com.feng.mapper.UserMapper;
import com.feng.pojo.User;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
@MapperScan("com.feng.mapper")
public class UserServiceImpl implements UserService{


    @Autowired
    private UserMapper userMapper;

    public UserServiceImpl() {
    }

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

    public User selectUser(String username, String password) {
        System.out.println("UserServiceImpl=>"+username);
        System.out.println("UserServiceImpl=>"+password);
        return userMapper.selectUser(username,password);
    }

    public void show()
    {
        System.out.println("hello word");
    }
}

spirng-service.xml：

<?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
       https://www.springframework.org/schema/context/spring-context.xsd">


    <!--扫描service下的包-->
    <context:component-scan base-package="com.feng.service"/>
    
    <!--可以写一些事务、aop等配置，也可以用注解方式实现，这里没有进行配置-->
</beans>

service整合完毕

测试：

@Test
public void test()
{
    ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserService userServiceImpl = (UserService) context.getBean("userServiceImpl");

    User admin = userServiceImpl.selectUser("admin", "123456");
    System.out.println(admin);

}

测试成功

Spring整合MVC

控制层UserController

package com.feng.controller;


import com.feng.pojo.User;
import com.feng.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;


@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/s1")
    public String selectUser(Model model)
    {
        userService.show();
        User user = userService.selectUser("admin", "123456");
        model.addAttribute("msg",user);
        return "hello";
    }
}

视图解析器：

<?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">


    <!--dispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <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>


    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

spring-mvc.xml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:mvc="http://www.springframework.org/schema/mvc"
       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/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置SpringMVC-->

    <!--1.开启注解驱动-->
    <mvc:annotation-driven/>

    <!--2.过滤静态资源-->
    <mvc:default-servlet-handler/>

    <!--3.扫描包-->
    <context:component-scan base-package="com.feng.controller"/>

    <!--4.配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

hello.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>