参考:Spring MVC 3.0.5+Spring 3.0.5+MyBatis3.0.4全注解实例详解(一):
http://www.blogjava.net/bolo/archive/2011/05/23/349655.html
Maven最佳实践:版本管理: http://juvenshun.iteye.com/blog/376422
使用Eclipse构建Maven的SpringMVC项目: http://limingnihao.iteye.com/blog/830409
基于namespace接口与公用dao的区别,从MyBatis3.0开始,对mapper中的namespace属性新增了一个特性:可以指定具体的接口来作为持久化操作类,在接口中定义与映射文件中id属性值相同的方法,MyBatis会自动去绑定和执行对应的SQL语句。这种接口实现方式,需要为每个Mapper创建一个接口,如果系统做大了,维护这些类会比较麻烦,大象个人倾向于基础服务式的Dao实现类.
首先是pox.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>com.pas</groupId> <artifactId>ssm3</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>ssm3 Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <spring.version>3.2.1.RELEASE</spring.version> <mybatis.version>3.1.1</mybatis.version> <mybatis.spring.version>1.1.1</mybatis.spring.version> <aspectj.version>1.6.10</aspectj.version> <jetty.version>6.1.26</jetty.version> <tomcat.version>2.1-SNAPSHOT</tomcat.version> <junit.version>3.8.1</junit.version> <mysql.version>5.1.23</mysql.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis.spring.version}</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!-- <dependency> <groupId>org.aspectj</groupId> <artifactId>acpectjrt</artifactId> <version>${aspectj.version}</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>acpectjweaver</artifactId> <version>${aspectj.version}</version> </dependency> --> </dependencies> <build> <finalName>ssm3</finalName> <pluginManagement> <plugins> <plugin> <groupId>org.mortbay.jetty</groupId> <artifactId>maven-jetty-plugin</artifactId> <version>${jetty.version}</version> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>${tomcat.version}</version> </plugin> <plugin> <!-- 注解支持,jdk5才具有的新特性,我们需要设置compile插件,具体可以参考Setting the -source and -target of the Java Compiler,根据说明,我们继续向pom文件中加入 --> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>5</source> <target>5</target> </configuration> </plugin> <plugin> <!-- 我们想将所有的依赖库都打包,直接交给用户,这样用户不需要在做其他设置了,这里需要使用Assembly插件了,其说明参考Pre-defined Descriptor Files,这个参考文件也说明了有四种默认定义的打包方式,我们选择jar-with-dependencies,继续添加pom文件 --> <artifactId>maven-assembly-plugin</artifactId> <configuration> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <executions> <execution> <id>copy</id> <phase>install</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>$/lib</outputDirectory> <!-- 拷贝所以依赖存放位置 --> </configuration> </execution> </executions> </plugin> </plugins> </pluginManagement> </build> </project>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>ssm3</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>ssm3</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
jdbc.properties driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/pasystem username=root password=
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd"> <context:component-scan base-package="com"> <context:exclude-filter expression="org.springframework.stereotype.Controller" type="annotation" /> </context:component-scan> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${driver}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> </bean> <!-- 事务处理 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <tx:annotation-driven transaction-manager="transactionManager"/> <!-- sqlSessionFactory配置 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="configLocation" value="classpath:mybatis-config.xml" /> <property name="dataSource" ref="dataSource" /> </bean> <!-- Mapper的配置,莫非每个Mapper都要配置?不能注解?那也是个负担... --> <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean"> <property name="mapperInterface" value="com.pas.mapper.IUserMapper"/> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean> </beans>
ssm3-servlet.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 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <mvc:annotation-driven /> <context:component-scan base-package="com" use-default-filters="false"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" /> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" /> </context:component-scan> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean> <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/views/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
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> <!-- 设定别名,这里可以设定一些常用的别名,在Mapper可以使用,但是由于数据库的字段会存在下划线等,而java里面又不推荐使用,所以类似这样,就不推荐使用,而是使用resultMap和paramterMap --> <typeAliases> <typeAlias alias="defaultUser" type="com.pas.dao.domain.User"></typeAlias> </typeAliases> <!-- 增加mapper.xml文件 --> <mappers> <mapper resource="com/pas/dao/xml/User.xml" /> </mappers> </configuration>
src/main/java/com/pas/dao/xml/User.xml
<?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"> <!-- 接口方式的时候, namespace要定义成Mapper的接口名字 --> <mapper namespace="com.pas.mapper.IUserMapper"> <resultMap type="com.pas.dao.domain.User" id="RUser"> <id property="userId" column="user_id"/> <result property="code" column="code"/> <result property="password" column="password"/> <result property="email" column="email"/> <result property="state" column="state"/> </resultMap> <parameterMap type="com.pas.dao.domain.User" id="PUser"> <parameter property="userId" javaType="int" /> <parameter property="code" /> <parameter property="password" /> <parameter property="email" /> <parameter property="state" /> </parameterMap> <select id="queryUserById" parameterType="int" resultMap="RUser"> select user_id, code,password,email, state from User where user_id = #{userId} </select> <select id="queryUserByName" parameterType="string" resultMap="RUser"> select user_id, code,password,email, state from User where code = #{code} </select> <insert id="insertUser" parameterMap="PUser"> insert into User(user_id, code,password,email, state) values(#{userId}, #{code},#{password},#{email}, #{state}) </insert> <update id="updateUser"> update User set code=#{code},password=#{password},email=#{email},state=#{state} where user_id=#{userId} </update> </mapper>
User.java
package com.pas.dao.domain; import java.util.Date; public class User { private int userId; private String code; private String password; private String email; private String state; private String createBy; private Date createDatetime; private String modifyBy; private Date modifyDatetime; ...... }
两种方式
DAO方式:
接口
IUsersDao.java
package com.pas.dao; import java.util.List; public interface IUsersDao { @SuppressWarnings("rawtypes") public abstract List queryUserByName(String name); }
实现类
UsersDao.java
package com.pas.dao.impl; import java.util.List; import org.mybatis.spring.support.SqlSessionDaoSupport; import org.springframework.stereotype.Repository; import com.pas.dao.IUsersDao; /** * 这个是使用dao方式,这种方式可以处理自定义异常等. * @author Administrator * */ @Repository public class UsersDao extends SqlSessionDaoSupport implements IUsersDao { @SuppressWarnings("rawtypes") @Override public List queryUserByName(String name) { System.out.println("Users.queryUserByName()"); //com.pas.mapper.IUserMapper.queryUserByName 这里是空间名字+sql id return getSqlSession().selectList("com.pas.mapper.IUserMapper.queryUserByName", name); } }
接口+namespace方式:
Mapper接口
IUserMapper.java
package com.pas.mapper; import com.pas.dao.domain.User; /** * 这里是Mapper接口,接口定义的方法一定跟User.xml里面的sql id一致,否则会出现错误. * @author Administrator * */ public interface IUserMapper { public abstract User queryUserById(int id); public abstract void insertUser(User user); public abstract void updateUser(User user); }
UserMapper.java
package com.pas.mapper.impl; import com.pas.dao.domain.User; import com.pas.mapper.IUserMapper; /** * 这个是Mapper接口方式,接口的方法名字就直接对应User.xml里面的SQL ID.<p> * 在实现类里面实现并直接使用接口,其实这个接口的实现就是User.xml * @author Administrator * */ public class UserMapper implements IUserMapper { private IUserMapper userMapper; @Override public User queryUserById(int id) { return userMapper.queryUserById(id); } @Override public void insertUser(User user) { System.out.println("userMapper insertUser"); userMapper.insertUser(user); } @Override public void updateUser(User user) { System.out.println("userMapper updateUser"); userMapper.updateUser(user); } public IUserMapper getUserMapper() { return userMapper; } public void setUserMapper(IUserMapper userMapper) { this.userMapper = userMapper; } }
Service:
接口:这个接口并不是必要的
IUsersService.java
package com.pas.service; import com.pas.dao.domain.User; public interface IUsersService { public abstract User queryUsersById(int id); public abstract User queryUsersByName(String name); public abstract void saveUser(User user); }
实现类:
UsersServiceImpl.java
package com.pas.service.impl; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.pas.dao.IUsersDao; import com.pas.dao.domain.User; import com.pas.mapper.IUserMapper; import com.pas.service.IUsersService; @Service(value="usersService") @Transactional(rollbackFor=Exception.class) public class UsersServiceImpl implements IUsersService { @Resource(name="userMapper") private IUserMapper userMapper; @Resource(name="usersDao") private IUsersDao usersDao; @Override @Transactional(propagation=Propagation.REQUIRED, readOnly=true) public User queryUsersById(int id){ return userMapper.queryUserById(id); } /** * 使用dao方式 */ @SuppressWarnings("rawtypes") @Override @Transactional(propagation=Propagation.REQUIRED, readOnly=true) public User queryUsersByName(String name){ List list = usersDao.queryUserByName(name); System.out.println("list = "+list==null?"0":list.size()); if(list!=null&&list.size()>0) return (User)list.get(0); return null; } /** * 使用Mapper接口方式 */ @Override @Transactional(propagation=Propagation.REQUIRED) public void saveUser(User user){ if(user.getUserId()<=0){ System.out.println("insertUser"); userMapper.insertUser(user); }else{ System.out.println("updateUser"); userMapper.updateUser(user); } //throw new RuntimeException("@@ Rollback for Debug.........."); } }
Controller类:
TestController.java
package com.pas.controller; import java.util.Date; import javax.annotation.Resource; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import com.pas.dao.domain.User; import com.pas.service.IUsersService; @Controller public class TestController { @Resource(name = "usersService") private IUsersService usersService; @RequestMapping(value = "/doTest.do") public String doTest() { User user = new User(); user.setCode("pandy"); user.setEmail("afasdf"); user.setPassword("pandy"); user.setState("001"); user.setCreateBy("01"); user.setCreateDatetime(new Date()); user.setModifyBy("001"); user.setModifyDatetime(new Date()); usersService.saveUser(user); user = usersService.queryUsersById(1); user = usersService.queryUsersByName("pandy"); System.out.println("Test success......."); return "success"; } }