SSM整合

整合SSM框架

基本准备

创建数据库

CREATE TABLE `ssm` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

基本环境依赖

    <!--依赖 junit 数据库驱动 连接池 servlet jsp mybatis mybatis-spring spring-->
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <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>
        <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>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>

整合Mybatis层

数据库配置文件database.properties

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

编写数据库对应的实体类 ssm.entity.User

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
}

编写dao层的mapper接口 ssm.mapper

public interface UserMapper {
    // 增加一个用户
    int addUser(User user);

    // 删除一个用户
    int deleteUserById(@Param("userId") int id);

    // 更新一个用户
    int updateUser(User user);

    // 查询一个用户
    User queryUserById(@Param("userId") int id);

    // 查询全部用户
    List<User> queryAll();
}

编写接口对应的Mapper.xml，需要导入Mybatis的包

<?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="ssm.mapper.UserMapper">
    <insert id="addUser" parameterType="User">
        insert into ssm (id,username,password)
        values (#{id},#{username},#{password});
    </insert>

    <delete id="deleteUserById" parameterType="int">
        delete from ssm where id=#{userId}
    </delete>

    <update id="updateUser" parameterType="User">
        update ssm
        set id=#{id},username=#{username},password=#{password}
        where id=#{id};
    </update>

    <select id="queryUserById" resultType="User" parameterType="int">
        select * from books where id=#{id}
    </select>

    <select id="queryAll" resultType="User">
        select * from ssm
    </select>
</mapper>

编写Service层的接口和实现类 ssm.service

//接口
public interface UserService {
    // 增加一个用户
    int addUser(User user);

    // 删除一个用户
    int deleteUserById(@Param("userId") int id);

    // 更新一个用户
    int updateUser(User user);

    // 查询一个用户
    User queryUserById(@Param("userId") int id);

    // 查询全部用户
    List<User> queryAll();
}

//实现类
public class UserServiceImpl implements UserService{
    //service调dao层 设置一个set接口 方便Spring管理
    private UserMapper userMapper;

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

    public int addUser(User user) {
        return userMapper.addUser(user);
    }

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

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

    public User queryUserById(int id) {
        return userMapper.queryUserById(id);
    }

    public List<User> queryAll() {
        return userMapper.queryAll();
    }

}

编写Mybatis的核心配置文件 mybatis-config.xml

<?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>
    <!--配置数据源，交给Spring做-->
    <typeAliases>
        <package name="ssm.entity"/>
    </typeAliases>

    <mappers>
        <mapper class="ssm.mapper.UserMapper"/>
    </mappers>
</configuration>

测试dao层是否连接上数据库

    @Test
    public void text() {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserServiceImpl userServiceImpl = (UserServiceImpl) context.getBean("userServiceImpl", UserServiceImpl.class);
        List<User> users = userServiceImpl.queryAll();
        for (User user : users) {
            System.out.println(user.toString());
        }
    }

整合Spring层

  1. 配置Spring整合Mybatis，数据源使用c3p0连接池
  2. 编写Spring整合Mybatis的相关配置文件: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
        https://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"/>
    <!--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"/>
        <!--绑定Mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--4.配置dao接口扫描包 动态实现了Dao接口可以注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--要扫描的dao包-->
        <property name="basePackage" value="ssm.mapper"/>
    </bean>

</beans>
  1. Spring整合service spring-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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.扫描Service下的包-->
    <context:component-scan base-package="ssm.service"/>
    <!--2.将我们的所有业务类，注入到Spring，可以通过配置，或者注解实现-->
    <bean id="userServiceImpl" class="ssm.service.UserServiceImpl">
        <property name="userMapper" ref="userMapper"/>
    </bean>
    <!--3.声明事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

整合SpringMVC层

  1. web.xml
<?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">
    <!--DispatchServlet-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--一定要注意:这里加载的是总的配置文件-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</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-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>
  1. spring-mvc.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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--1.注解驱动-->
    <mvc:annotation-driven/>
    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler/>
    <!--3.扫描包：controller-->
    <context:component-scan base-package="ssm.controller"/>
    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <!--把所有的视图都存放在/WEB-INF/目录下，这样可以保证视图安全，因为这个目录下的文件，客户端不能直接访问。-->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
</beans>
  1. Spring配置整合文件，applicationContext.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="spring-mvc.xml"/>
    
</beans>

测试ssm整合成功

1. 在web/WEB_INF下创建 jsp/index.jsp
2. 创建controller ssm.controller.UserController
    @RequestMapping("/")
    public String index(Model model) {
        List<User> users = userService.queryAll();
        model.addAttribute("user", users);
        return "index";
    }
3. jsp获取接受数据
    1. 导入依赖 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    2. 获取数据
    <c:forEach var="user" items="${user}">
    <tr>
        <td>${user.id}</td>
        <td>${user.username}</td>
        <td>${user.password}</td>
    </tr>
    </c:forEach>
©著作权归作者所有,转载或内容合作请联系作者
平台声明：文章内容（如有图片或视频亦包括在内）由作者上传并发布，文章内容仅代表作者本人观点，简书系信息发布平台，仅提供信息存储服务。

推荐阅读更多精彩内容