前面给大家讲了整合的思路和整合的过程,在这里就不在提了,直接把springMVC+spring+Mybatis整合的实例代码(单表的增删改查)贴给大家:
首先是目录结构:
仔细看看这个目录结构:我不详细解释了直接把所有的代码贴出来
实体类:com.etc.entity.User.java(get,set,空的构造方法,tostring记得生成)
public class User implements Serializable{
private static final long serialVersionUID = 1L;
private int userid;
private String uname;
private String upassword;
private String usex;
}
dao:com.ect.dao(这个里面因为包扫描的规则必须把mapper的接口和mapper的xml放在同一个包底下,并且名称一样,在idea中如果无法使用,可以加上@Repository这个注解)
com.etc.dao.UserMapper.java(里面是增删改查的接口)
public interface UserMapper {
public List<User> findAll();
public void insertUser(User user);
public void deleteUserById(int userid);
public User findById(int userid);
public void updateUser(User user);
}
com.etc.dao.UserMapper.xml(实现增删改查的数据库操作)
<?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">
<!-- 命名空间,可以对sql进行分类的一个管理 -->
<mapper namespace="com.etc.dao.UserMapper">
<!-- 查询全部 -->
<select id="findAll" resultType="com.etc.entity.User">
select * from t_user;
</select>
<!-- 根据ID查询-->
<select id="findById" parameterType="int" resultType="com.etc.entity.User">
select *
from t_user where userid=#{userid};
</select>
<!-- 插入-->
<insert id="insertUser" parameterType="User">
insert into t_user
(uname,upassword,usex)values(#{uname},#{upassword},#{usex});
</insert>
<!-- 删除-->
<delete id="deleteUserById" parameterType="int">
delete from t_user
where userid=#{userid}
</delete>
<!-- 更新-->
<update id="updateUser" parameterType="User">
update t_user set
uname=#{uname},upassword=#{upassword},usex=#{usex} where
userid=#{userid}
</update>
</mapper>
业务类接口:com.etc.service.UserService.java
public interface UserService {
List<User>findAll();
public void insertUser(User user);
public void deleteUserById(int userid);
public User findById(int userid);
public void updateUser(User user);
}
业务类的实现类:com.etc.srvice.impl.UserServiceImpl.java
这里有几个注意的地方:
1.需要用@Service这个注解标识者是一个业务类
2.需要用@Autowired或者@Resource把mapper的接口对象注入到spring中(就是如下加个注解就好)
3.这是使用的是非注解的事物配置
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;//mapper的接口
public List<User> findAll() {
// TODO Auto-generated method stub
return userMapper.findAll();
}
public void insertUser(User user) {
userMapper.insertUser(user);
}
public void deleteUserById(int userid) {
// TODO Auto-generated method stub
userMapper.deleteUserById(userid);
}
public User findById(int userid) {
// TODO Auto-generated method stub
return userMapper.findById(userid);
}
public void updateUser(User user) {
// TODO Auto-generated method stub
userMapper.updateUser(user);
}
}
控制器:com.etc.controller.UserController.java
这里也有几个地方需要注意:
1.需要用这个注解标识这是一个控制器
2.需要用@Autowired或者@Resource把service的接口对象注入到spring中(就是如下加个注解就好)
@Controller
public class UserController {
@Resource
private UserService ueService;
/**
* 跳转到添加的页面
* @return
*/
@RequestMapping(value="/insert")
public String insert(){
return "insert";
}
/**
* 添加用户
* @param user
* @return
*/
@RequestMapping(value="/insertUser")
public String insertUser(User user){
ueService.insertUser(user);
return "redirect:findAll";
} /**
* 根据ID删除用户
* @param user
* @return
*/
@RequestMapping(value="/deleteUserById")
public String deleteUserById(int userid){
ueService.deleteUserById(userid);
return "redirect:findAll";
} /**
* 根据ID查找用户
* @param user
* @return
*/
@RequestMapping(value="/findById")
public String findById(Model model,int userid){
User user=ueService.findById(userid);
model.addAttribute("user", user);
return "update";
}
/**
* 更新用户
* @param user
* @return
*/
@RequestMapping(value="/updateUser")
public String updateUser(User user){
ueService.updateUser(user);
return "redirect:findAll";
}
/**
* 查找所有用户
* @return
*/
@RequestMapping(value="/findAll")
public ModelAndView findAll(){
ModelAndView mv= new ModelAndView();
List<User>list=ueService.findAll();
mv.addObject("list",list);
mv.setViewName("listuser");
return mv;
}
}
Mybatis的全局配置文件mybatis-config.xml信息
<?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>
<typeAliases>
<typeAlias type="com.etc.entity.User" alias="User" />
</typeAliases>
</configuration>
spring的配置文件applicationContext.xml信息
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc" 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-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
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <!-- 配置数据源的文件的位置 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- 数据库连接池 -->
</bean> <!-- 配置SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 指定数据源 -->
<property name="dataSource" ref="dataSource"></property>
<!-- 指定Mybatis配置文件的路径 -->
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"></property>
</bean>
<!-- 配置mapper的扫描包 -->
<!-- 去bean的时候,的规则:bean的名字=原先类的类名小写 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.etc.dao"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean> <!-- 事物的配置 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<!-- 数据源 -->
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 通知 -->
<tx:advice transaction-manager="transactionManager" id="txAdvice">
<!-- 传播行为:什么方法需要用到事物 -->
<tx:attributes>
<!--<tx:method name="*" rollback-for="RunTimeException"/>-->
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="insert*" propagation="REQUIRED"/>
<tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
<tx:method name="select*" propagation="SUPPORTS" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- Aop 告诉spring哪里需要用到事物-->
<aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.etc.service.impl.*.*(..))"/>
</aop:config>
</beans>
springMVC的配置文件dispatcher-servlet.xml信息
<?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: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-3.0.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">
<!-- 默认的注解映射支持 -->
<mvc:annotation-driven/>
<!-- 启用自动扫描 -->
<context:component-scan base-package="com.etc.*"></context:component-scan>
<!-- 配置ViewResolver -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
web.xml的配置信息
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd"> <!-- spring 容器配置 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- spring 配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:spring/applicationContext.xml</param-value>
</context-param>
<servlet>
<servlet-name>dispatch</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--
默认的配置文件的地址:/WEB-INF/servlet的名字-servlet.xml <init-param>-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/dispatcher-servlet.xml</param-value>
</init-param> </servlet>
<servlet-mapping>
<servlet-name>dispatch</servlet-name>
<!--
第一种:*.html,*.action 就是过滤以.xxx结尾的 第二种:/ 所有的地址都会进入这个进行解析,静态的资源,需要添加配置
第三种:/* 他就是变态,连jsp页面都进来,结果就是报错XXXXX别用
-->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- post中文乱码处理 -->
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
到这里代码就结束了,页面就不给了,自己写看着写吧。
总结一下过程:
这里只要记得流程是这样的:
页面发起一个请求-->控制器-->控制器通过一个service对象调用service的方法-->service中通过userMapper对象调用dao中的方法-->去查询数据库