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  • 框架篇:Spring+SpringMVC+Mybatis整合开发

     

    前言:

      前面我已搭建过ssh框架(http://www.cnblogs.com/xrog/p/6359706.html)。

      然而mybatis表示不服啊。 Hibernate:“不服便战!”

      我们先看下对战双方阵势:

                    Hiberate    VS  Mybatis

       第一回合:开发速度

          刷图难度:Hibernate前期升级需要大量经验,所以你想玩转Hibernate,得多打打小怪,看看攻略什么的.

               Mybatis相对简单许多,只要MySQL这件装备强化上去,刷怪轻轻松松

          刷图效率:Mybatis需要我们手动写sql语句,回归最原始的方式,所以可以按需求制定查询的字段,

                  提高效率,由于是自己编写sql语句,所以查询的灵活度也比hibernate高。

               Hibernate的查询会将表中的所有字段查询出来,这一点性能消耗比Mybatis大。当然,

                  Hibernate也可以自己写SQL来指定需要查询的字段,但这样就破坏了Hibernate封装

                  以及开发的简洁性。

       第二回合:数据库移植性

          Mybatis由于所有SQL都是依赖数据库书写的,所以扩展性,迁移性比较差。

          Hibernate与数据库具体的关联都在XML中,所以HQL对具体是用什么数据库并不是很关心。

       第三回合:缓存机制对比

          相同点:Hibernate和Mybatis的二级缓存除了采用系统默认的缓存机制外,都可以通过实现你自己的缓存或为

              其他第三方缓存方案,创建适配器来完全覆盖缓存行为。

          不同点:Hibernate的二级缓存配置在SessionFactory生成的配置文件中进行详细配置,

                然后再在具体的表-对象映射中配置是那种缓存。

              MyBatis的二级缓存配置都是在每个具体的表-对象映射中进行详细配置,这样针对不同的表可以自定义

                不同的缓存机制。并且Mybatis可以在命名空间中共享相同的缓存配置和实例,通过Cache-ref来实现。  

          两者比较:因为Hibernate对查询对象有着良好的管理机制,用户无需关心SQL。所以在使用二级缓存时如果出现脏数据,

               系统会报出错误并提示。而MyBatis在这一方面,使用二级缓存时需要特别小心。如果不能完全确定数据更新

               操作的波及范围,避免Cache的盲目使用。否则,脏数据的出现会给系统的正常运行带来很大的隐患。

        总结:    

          Mybatis:小巧、方便、高效、简单、直接、半自动化

          Hibernate:强大、方便、高效、复杂、间接、全自动化

    好了,没时间解释了,快上车

    导包

    还是老套路,就不多说了,配置pom.xml: 

    <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/maven-v4_0_0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>XRom</groupId>
        <artifactId>ssm</artifactId>
        <packaging>war</packaging>
        <version>1.0-SNAPSHOT</version>
        <name>ssm Maven Webapp</name>
        <url>http://maven.apache.org</url>
    
        <!--此处统一配置版本信息-->
        <properties>
            <!-- spring版本 -->
            <springVersion>4.3.1.RELEASE</springVersion>
            <!-- mybatis版本 -->
            <mybatis.version>3.2.6</mybatis.version>
            <!--<mysqlVersion>6.0.3</mysqlVersion>-->
            <mysqlVersion>5.1.38</mysqlVersion>
    
            <lombokVersion>1.16.10</lombokVersion>
            <log4jVersion>1.2.17</log4jVersion>
            <slf4jVersion>1.7.7</slf4jVersion>
            <fileuploadVersion>1.3.1</fileuploadVersion>
            <jstlVersion>1.2</jstlVersion>
            <!--<taglibVersion>1.1.2</taglibVersion>-->
            <!--<servletVersion>3.0-alpha-1</servletVersion>-->
        </properties>
    
        <dependencies>
            <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>3.8.1</version>
              <scope>test</scope>
            </dependency>
    
            <!-- spring-->
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-beans</artifactId>
              <version>${springVersion}</version>
            </dependency>
    
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-core</artifactId>
              <version>${springVersion}</version>
            </dependency>
    
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-context</artifactId>
              <version>${springVersion}</version>
            </dependency>
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-orm</artifactId>
              <version>${springVersion}</version>
            </dependency>
    
            <!-- spring web + spring MVC-->
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-web</artifactId>
              <version>${springVersion}</version>
            </dependency>
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-webmvc</artifactId>
              <version>${springVersion}</version>
            </dependency>
    
            <!-- mybatis核心包 -->
            <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis</artifactId>
              <version>${mybatis.version}</version>
            </dependency>
            <!-- mybatis + spring -->
            <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis-spring</artifactId>
              <version>1.2.2</version>
            </dependency>
    
    
            <!-- DataBase数据库连接 mysql包-->
            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>${mysqlVersion}</version>
            </dependency>
    
            <!-- 导入dbcp的jar包,用来在applicationContext.xml中配置数据库 -->
            <dependency>
              <groupId>commons-dbcp</groupId>
              <artifactId>commons-dbcp</artifactId>
              <version>1.2.2</version>
            </dependency>
    
            <!-- log4j配置, 视情况添加-->
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4jVersion}</version>
            </dependency>
            <!--<dependency>-->
                <!--<groupId>com.alibaba</groupId>-->
                <!--<artifactId>fastjson</artifactId>-->
                <!--<version>1.1.41</version>-->
            <!--</dependency>-->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${slf4jVersion}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${slf4jVersion}</version>
            </dependency>
    
            <!--文件上传包-->
            <dependency>
              <groupId>commons-fileupload</groupId>
              <artifactId>commons-fileupload</artifactId>
              <version>${fileuploadVersion}</version>
            </dependency>
    
            <!-- jsp页面使用的jstl支持-->
            <dependency>
              <groupId>jstl</groupId>
              <artifactId>jstl</artifactId>
              <version>${jstlVersion}</version>
            </dependency>
    
            <!-- lombok插件导包-->
            <dependency>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
              <version>${lombokVersion}</version>
              <scope>provided</scope>
            </dependency>
        </dependencies>
    
    
        <build>
            <finalName>ssm</finalName>
    
            <plugins>
                <!--java8-->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
    
                <!-- mybatis-generator-maven-plugin-->
                <plugin>
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.2</version>
                    <configuration>
                        <verbose>true</verbose>
                        <overwrite>true</overwrite>
                    </configuration>
                </plugin>
    
            </plugins>
        </build>
    </project>

      

    OK,配置后运行下maven,就会自动向中央仓库下载相应的包啦!另外我这里结尾多配置了两个插件,一个是Java8新特性的,一个是Mybatis Generator的,这两个插件暂时可以不配置 

    SpringMVC配置

    我现在在这里把我配置后的结构拿出来给你们看下,最终的结构就是这样了,当然,部分配置如log4j,generator这些本文章并没用使用到

    我们先配置下SpringMVC的配置:resources/META-INF/spring-mvc.xml

     ps:这个和上篇博客配置是一样的

    <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-4.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.1.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
           
           <!-- 启动注解驱动的spring MVC功能,注册请求url和注解POJO类方法的映射-->
           <mvc:annotation-driven />
        <!-- 对模型视图名称的解析,在请求时模型视图名称添加前后缀 -->
        <context:component-scan base-package="com.ssm" />
    
        <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
            <property name="prefix" value="views/" />      <!-- 前缀 -->
            <property name="suffix" value=".jsp" />   <!-- 后缀 -->
        </bean>
        
        <!--这里是对静态资源的映射-->
        <mvc:resources mapping="/js/**" location="/resources/js/" />
        <mvc:resources mapping="/css/**" location="/resources/css/" />
        <mvc:resources mapping="/img/**" location="/resources/img/" />
    
    </beans>

     好了,我们现在修改下web.xml这个配置文件,完善下SpringMVC的配置, web.xml配置如下:

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://java.sun.com/xml/ns/javaee"
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
             version="3.0">
            <!-- 地址为http://localhost:8080/  显示的默认网页-->
            <welcome-file-list>
              <welcome-file>/index.jsp</welcome-file>
            </welcome-file-list>
    
            <!-- spring MVC config start-->
            <servlet>
                <servlet-name>spring</servlet-name>
                <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
                <init-param>
                  <param-name>contextConfigLocation</param-name>
                  <!-- 此处指向的的是SpringMVC的配置文件 -->
                  <param-value>classpath:META-INF/spring-mvc.xml</param-value>
                </init-param>
                <!--配置容器在启动的时候就加载这个servlet并实例化-->
                <load-on-startup>1</load-on-startup>
            </servlet>
    
            <servlet-mapping>
                <servlet-name>spring</servlet-name>
                <url-pattern>/</url-pattern>
            </servlet-mapping>
            <!-- spring MVC config end-->
    
    </web-app>

    OK,SpringMVC配置完成,现在我们进行一下测试吧

    在controller层新建一个MainController,内容如下

    package com.ssm.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    
    /**
     * Created by XRog
     * On 2/1/2017.12:36 AM
     */
    @Controller
    public class MainController {
    
        @RequestMapping(value = "test", method = RequestMethod.GET)
        public String test(){
    //        实际返回的是views/test.jsp ,spring-mvc.xml中配置过前后缀
            return "test";
        }
    }

    test.jsp网页如下:

    <html>
    <body>
    <center>
    <h2 style="color: #ff261a;">this is my test page!</h2>
    </center>
    </body>
    </html>

    重启Tomcat服务器, 然后浏览器访问http://localhost/test如下图所示:

    PS: Tomcat默认端口是8080,我更改了端口号,如若你们未更改,正确的访问地址是localhost:8080/test

    OK,成功访问。 

    SpringMVC+Spring整合

     这个就十分简单了, 配置spring-mybatis.xml这个Spring的配置文件如下(后面的mybatis配置我也将写在这里):

    <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-3.1.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    
            <!-- 自动扫描 -->
            <context:component-scan base-package="com.ssm">
                <!-- 扫描时跳过 @Controller 注解的JAVA类(控制器) -->
                <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
            </context:component-scan>
    
    </beans>

    完善web.xml配置文件如下:

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://java.sun.com/xml/ns/javaee"
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
             version="3.0">
            <!-- 地址为http://localhost:8080/  显示的默认网页-->
            <welcome-file-list>
              <welcome-file>/index.jsp</welcome-file>
            </welcome-file-list>
    
        <!--加载Spring的配置文件到上下文中去-->
            <context-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>
                    classpath:META-INF/spring-mybatis.xml
                </param-value>
            </context-param>
    
            <!-- spring MVC config start-->
            <servlet>
                <servlet-name>spring</servlet-name>
                <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
                <init-param>
                  <param-name>contextConfigLocation</param-name>
                  <!-- 此处指向的的是SpringMVC的配置文件 -->
                  <param-value>classpath:META-INF/spring-mvc.xml</param-value>
                </init-param>
                <!--配置容器在启动的时候就加载这个servlet并实例化-->
                <load-on-startup>1</load-on-startup>
            </servlet>
    
            <servlet-mapping>
                <servlet-name>spring</servlet-name>
                <url-pattern>/</url-pattern>
            </servlet-mapping>
            <!-- spring MVC config end-->
    
    
            <!-- Spring监听器 -->
            <listener>
                <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
            </listener>
    
            <!--  字符集过滤  -->
            <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>
                <init-param>
                    <param-name>forceEncoding</param-name>
                    <param-value>true</param-value>
                </init-param>
            </filter>
            <filter-mapping>
                <filter-name>encodingFilter</filter-name>
                <url-pattern>/*</url-pattern>
            </filter-mapping>
    
    </web-app>

    web.xml配置文件中更改了三处:引入Spring-mybaits配置文件 Spring的监听器  以及 字符集过滤

    OK,Spring+SpringMVC配置完成,下面我们开始测试:

    在service写一个TestServiceImpl实现TestService接口并实现其test()方法, 代码如下:

    package com.ssm.service.impl;
    
    import com.ssm.service.TestService;
    import org.springframework.stereotype.Service;
    
    /**
     * Created by XRog
     * On 2/1/2017.12:58 AM
     */
    @Service
    public class TestServiceImpl implements TestService {
        public String test() {
            return "test";
        }
    }

    PS:这里注意写@Service注解

    MainController控制器更改如下:

    package com.ssm.controller;
    
    import com.ssm.service.TestService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    
    /**
     * Created by XRog
     * On 2/1/2017.12:36 AM
     */
    @Controller
    public class MainController {
    
        @Autowired
        private TestService testService;
    
        @RequestMapping(value = "test", method = RequestMethod.GET)
        public String test(){
    //        实际返回的是views/test.jsp ,spring-mvc.xml中配置过前后缀
            return "test";
        }
    
        @RequestMapping(value = "springtest", method = RequestMethod.GET)
        public String springTest(){
            return testService.test();
        }
    }

    控制器这里我们运用了Spring的依赖注入自动装配。

    在浏览器中输入地址http://localhost/springtest调用springtest方法     

    yes,成功返回,说明我们之前的配置没问题

    Spring+SpringMVC+Mybatis整合

    好了,现在就缺Mybatis这个框架了。。 我先给大家看些我搭建好之后的结构图吧

     

    我们先来编写jdbc.properties这个配置文件,里面存放的是mybatis的一些配置

    #这个是Mybatis Generator逆向工程要用到的,现在可以不配置
    jdbc.driverLocation=C:\Users\XRog\.m2\repository\mysql\mysql-connector-java\5.1.38\mysql-connector-java-5.1.38.jar

    #数据源 jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://zxr1998.com.cn:3306/ssm jdbc.username=??? jdbc.password=??? #初始化连接池连接数 initialSize=0 #连接池最大连接数 maxActive=20 #连接池最大空闲 maxIdle=20 #连接池最小空闲 minIdle=1 #最大等待时间 maxWait=60000

    这里连接数据库的参数由于我是连接我网上的数据库,因此我数据库地址和密码打了“???”,你们连接时改成自己本地的就OK了

    <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-3.1.xsd
                            http://www.springframework.org/schema/context
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd
                            http://www.springframework.org/schema/mvc
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    
            <!-- 自动扫描 -->
            <context:component-scan base-package="com.ssm">
                <!-- 扫描时跳过 @Controller 注解的JAVA类(控制器) -->
                <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
            </context:component-scan>
    
            <!-- 加载配置文件 -->
            <context:property-placeholder location="classpath:/jdbc.properties" />
    
            <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
                <property name="driverClassName" value="${jdbc.driver}" />
                <property name="url" value="${jdbc.url}" />
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
                <property name="initialSize" value="${initialSize}" />  <!--初始化连接池连接数-->
                <property name="maxActive" value="${maxActive}" />  <!--连接池最大连接数-->
                <property name="maxIdle" value="${maxIdle}" />  <!--连接池最大空闲-->
                <property name="minIdle" value="${minIdle}" />  <!--连接池最小空闲-->
                <property name="maxWait" value="${maxWait}" />  <!--连接最大等待时间-->
            </bean>
    
    
            <bean id="sqlSessionFaction" class="org.mybatis.spring.SqlSessionFactoryBean">
                <property name="dataSource" ref="dataSource" />
                <!-- 自动扫描mapping.xml文件 -->
                <property name="mapperLocations" value="classpath:/mapping/*.xml" />
            </bean>
    
            <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
                <property name="basePackage" value="com.ssm.mapping" />
                <property name="sqlSessionFactoryBeanName" value="sqlSessionFaction" />
            </bean>
    
            <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
                <property name="dataSource" ref="dataSource" />
            </bean>
    
    </beans>

     OK,到了这里,配置结束。下面进入测试阶段

    实体类(domain):

    package com.ssm.domain;
    
    public class Person {
        private Long id;
    
        private String username;
    
        private String password;
    
        public Long getId() {
            return id;
        }
    
        public void setId(Long id) {
            this.id = id;
        }
    
      
        public String getUsername() {
            return username;
        }
    
        public void setUsername(String username) {
            this.username = username == null ? null : username.trim();
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password == null ? null : password.trim();
        }
    }

    mapping(我这里使用generator生成的,粘贴的时候我去掉了很多注释,莫介意):

    package com.ssm.mapping;
    
    import com.ssm.domain.Person;
    import org.apache.ibatis.annotations.Delete;
    import org.apache.ibatis.annotations.Insert;
    import org.apache.ibatis.annotations.ResultMap;
    import org.apache.ibatis.annotations.Select;
    import org.apache.ibatis.annotations.SelectKey;
    import org.apache.ibatis.annotations.Update;
    
    public interface PersonMapper {
        int deleteByPrimaryKey(Long id);
    
        int insert(Person record);
    
        int insertSelective(Person record);
    
        Person selectByPrimaryKey(Long id);
    
        int updateByPrimaryKeySelective(Person record);
    
        int updateByPrimaryKey(Person record);
    }
     
    <?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.ssm.mapping.PersonMapper">
      <resultMap id="BaseResultMap" type="com.ssm.domain.Person">
        <!--
          WARNING - @mbggenerated
          This element is automatically generated by MyBatis Generator, do not modify.
        -->
        <id column="id" jdbcType="BIGINT" property="id" />
        <result column="username" jdbcType="VARCHAR" property="username" />
        <result column="password" jdbcType="VARCHAR" property="password" />
      </resultMap>
      <sql id="Base_Column_List">
        <!--
          WARNING - @mbggenerated
          This element is automatically generated by MyBatis Generator, do not modify.
        -->
        id, username, password
      </sql>
      <insert id="insertSelective" parameterType="com.ssm.domain.Person">
        <!--
          WARNING - @mbggenerated
          This element is automatically generated by MyBatis Generator, do not modify.
        -->
        <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long">
          SELECT LAST_INSERT_ID()
        </selectKey>
        insert into person
        <trim prefix="(" suffix=")" suffixOverrides=",">
          <if test="username != null">
            username,
          </if>
          <if test="password != null">
            password,
          </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
          <if test="username != null">
            #{username,jdbcType=VARCHAR},
          </if>
          <if test="password != null">
            #{password,jdbcType=VARCHAR},
          </if>
        </trim>
      </insert>
      <update id="updateByPrimaryKeySelective" parameterType="com.ssm.domain.Person">
        <!--
          WARNING - @mbggenerated
          This element is automatically generated by MyBatis Generator, do not modify.
        -->
        update person
        <set>
          <if test="username != null">
            username = #{username,jdbcType=VARCHAR},
          </if>
          <if test="password != null">
            password = #{password,jdbcType=VARCHAR},
          </if>
        </set>
        where id = #{id,jdbcType=BIGINT}
      </update>
    </mapper>

    服务层(service):

    package com.ssm.service;
    
    import com.ssm.domain.Person;
    
    /**
     * Created by XRog
     * on 5/27/2017.
     */
    public interface PersonService {
    
        int insert(Person person);
    }
    package com.ssm.service.impl;
    
    import com.ssm.domain.Person;
    import com.ssm.mapping.PersonMapper;
    import com.ssm.service.PersonService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    /**
     * Created by XRog
     * on 5/27/2017.
     */
    @Service
    public class PersonServiceImpl implements PersonService {
    
        @Autowired
        private PersonMapper personMapper;
    
        @Override
        public int insert(Person person) {
            return personMapper.insertSelective(person);
        }
    }

    控制层(controller):

    package com.ssm.controller;
    
    import com.ssm.domain.Person;
    import com.ssm.service.PersonService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    /**
     * Created by XRog
     * on 5/24/2017.
     */
    @Controller
    @RequestMapping("/test")
    public class TestController {
    
        @Autowired
        private PersonService personService;
    
        @RequestMapping(value = "mybatis")
        public @ResponseBody String mybatis(){
            Person person = new Person();
            person.setUsername("test2");
            person.setPassword("123");
            personService.insert(person);
            return "success";
        }
    }

    OK,编写完毕,我们重启下服务器然后测试:输入地址  localhost/test/mybatis  ,如果不出意外的话将返回success,这说明访问成功

    另外,这个ssm项目我已上传到码云,公开了共享,下面是地址.这篇博客很多地方(spring+springmvc )都是借用的上篇博客的,请以下面共享的项目地址为准

    https:  https://git.oschina.net/zxr_a/ssm.git

    ssh:   git@git.oschina.net:zxr_a/ssm.git

    好了,到这里就结束了,祝大家别出BUG。

      本人QQ:184370986 (千寻风)

    扫下方的二维码,我们就是朋友了 >_< !

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  • 原文地址:https://www.cnblogs.com/xrog/p/7064397.html
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