SSM整合

SSM 的整合

  1. 依赖填入

    <?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.shj</groupId>
    <artifactId>ssm_test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>war</packaging>

    <!--规定版本-->
    <properties>
        <!--统一管理spring相关产品的版本-->
        <spring-version>4.3.6.RELEASE</spring-version>
    </properties>

    <!--可以将xml文件建于java包下并且可被映射-->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>

        <plugins>
            <!-- define the project compile level -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <!-- 添加tomcat插件 -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <path>/</path>
                    <port>8080</port>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!--aop-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>com.springsource.org.aspectj.weaver</artifactId>
            <version>1.6.8.RELEASE</version>
        </dependency>

        <!--datasource-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.28</version>
        </dependency>

        <!--将mybatis交给spring管理-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!--日志-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <!--rest 风格-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.1</version>
        </dependency>

        <!--spring的事务操作-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!--spring的单元测试-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!--帮助pojo快速生成getter和setting-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.6</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

</project>

  2. web.xml配置

    <?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_3_1.xsd"
         version="3.1"
         metadata-complete="true">

    <!--配置SpringMVC-->
    <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:spring-mvc.xml</param-value>
        </init-param>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--使用spring框架写好的中文乱码过滤器-->
    <filter>
        <filter-name>encode</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>encode</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

  3. 配置spring-mvc.xml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"
       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">

    <!--设置ssm项目的注解配置-->
    <context:annotation-config/>

    <!--设置包扫描,分别扫描Controller和service包-->
    <context:component-scan base-package="controller"/>
    <context:component-scan base-package="service"/>

    <!--注解驱动-->
    <mvc:annotation-driven/>
    <!--配置默认资源可以访问-->
    <mvc:default-servlet-handler/>

    <!--引入spring-mvc配置文件-->
    <import resource="classpath: spring-mybatis.xml"/>
</beans>

  4. db.properties文件

    #db.properties文件
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3307/shop_mybatis
user=root
pass=970809

  5. 配置spring-mybatis.xml

    • 为了增强可读性,将与mybatis有关的配置分离出来

    • <?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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       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/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">


    <!--引入数据库的配置文件信息-->
    <context:property-placeholder location="classpath:db.properties"/>

    <!--druid数据源-->
    <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="url" value="${url}"/>
        <property name="driverClassName" value="${driver}"/>
        <property name="username" value="${user}"/>
        <property name="password" value="${pass}"/>
    </bean>

    <!--将mybatis交给spring来统一管理-->
    <bean id="sf" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="typeAliasesPackage" value="pojo"/>
        <property name="mapperLocations" value="classpath:dao/mapper/*Mapper.xml"/>
        <property name="dataSource" ref="ds"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--配置映射扫描配置,分别设置dao包扫描和SqlSessionFactory的指定-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="dao"/>
        <property name="sqlSessionFactoryBeanName" value="sf"/>
    </bean>

    <!--配置事务管理器-->
    <bean id="dtx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"/>

    <!--声明事务的实现方式
        以这些关键字开头的方法都分别设置事务的隔离级别以及出错后的操作
    -->
    <tx:advice transaction-manager="dtx" id="tx">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED" isolation="DEFAULT" rollback-for="Exception"/>
            <tx:method name="insert*" propagation="REQUIRED" isolation="DEFAULT" rollback-for="Exception"/>
            <tx:method name="update*" propagation="REQUIRED" isolation="DEFAULT" rollback-for="Exception"/>
            <tx:method name="delete*" propagation="REQUIRED" isolation="DEFAULT" rollback-for="Exception"/>
        </tx:attributes>
    </tx:advice>


    <!--aop配置-->
    <aop:config>
        <aop:pointcut id="mpt" expression="execution(* service.*.*(..))"/>
        <aop:advisor advice-ref="tx" pointcut-ref="mpt"/>
    </aop:config>
</beans>

  6. mybatis-config.xml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>
    <!--添加日志功能，STDOUT_LOGGING不需要添加第三方jar包-->
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
</configuration>

  7. log4j.properties配置

    # 全局日志配置
# 日志有四个级别 :error,warn,info,debug
log4j.rootLogger=ERROR, stdout, F
# MyBatis 日志配置 ,可自行设置追踪路径
log4j.logger.dao=TRACE
# 控制台输出
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

# 持久化
log4j.appender.F = org.apache.log4j.DailyRollingFileAppender
log4j.appender.F.File =myproj.log
log4j.appender.F.Append = true
log4j.appender.F.Threshold = DEBUG
log4j.appender.F.layout=org.apache.log4j.PatternLayout
log4j.appender.F.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss}-[%p %F\:%L]  %m%n

    配置完成,开始代码编写

    1. 实体类

      • 使用lombok注解

      • package pojo;

        import lombok.AllArgsConstructor;
        import lombok.Data;
        import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private String uid;
    private String name;
    private String pass;
    private String phone;
}

    2. dao接口

      public interface IUserDao {
    List<User> getAllUsers();
}

    3. 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">

<!--
    第二种实现mybatis的方式:接口+xml方式
    这种方式有特别的要求:
        1. namespace必须是接口的全路径
        2. id必须是方法名
        3. 该接口中的方法不允许重载,namespace+id必须唯一
        4. 接口中的增删改方法的返回值应该为int
-->

<mapper namespace="dao.IUserDao">

    <sql id="all">
         select * from users
    </sql>

    <select id="getAllUsers" resultType="User">
        <include refid="all"></include>
    </select>


</mapper>

    4. service接口

      package service;

import pojo.User;

import java.util.List;

public interface IUserService {

    List<User> getAllUsers();
}

    5. service实现类

      package service.Imp;

import dao.IUserDao;
import org.springframework.stereotype.Service;
import pojo.User;
import service.IUserService;

import javax.annotation.Resource;
import java.util.List;

@Service
public class UserService implements IUserService {

    @Resource
    IUserDao userDao;


    @Override
    public List<User> getAllUsers() {
        return userDao.getAllUsers();
    }
}

    6. Controller控制类

      package controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import pojo.User;
import service.IUserService;

import javax.annotation.Resource;
import java.util.List;

@RestController
public class UserController {

    @Resource
    private IUserService userService;

    @GetMapping("/getAllUsers")
    public List<User> getAllUsers() {
        List<User> list = userService.getAllUsers();
        return list;
    }
}
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