maven+spring+mybatis整合

哈哈,第一篇blog.

从没用过maven的jar包管理，项目要上马了，学着网上的很多demo，自己模仿着做了一个，记录下来，和大家分享。

比较着重于实现，细节原理好多不懂。

准备工作：

jdk:1.6.0_18

tomcat:6.0.18

maven3.1.1

spring:3.2.4

mybatis:3.2.3

IDE: eclipse J2EE kepler

mysql:5.1.53(msi)：

用到的User表结构：

Create TABLE `user` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `userName` varchar(50) DEFAULT NULL,  `userAge` int(11) DEFAULT NULL,  `userAddress` varchar(200) DEFAULT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

1.用官网下载的最新maven替代eclipse自带的maven

  

  并指定maven的配置文件,这里我没有改变maven本地仓库的位置,因为我在setting.xml中用的就是这个地址，网上看到很多人都自定义本地仓库的位置。

  

2.新建maven project,artifactId选择webapp,点击next, 名称就取缩写MSM,子项目叫example,点击Finish.

  

  

  3.新建好的project，不明白为什么已经指定用了最新版的maven，建出来的还是jre还是1.5的

  

   4.改jre，加source folder

   

  build path里修改test的compile目标路径

   

  5.右键项目名称，选择末项Properties，进入面板选择Project Facets，把java版本改成1.6

    记得改变之后点击apply，否则不生效。

  

  因为jdk是1.6的，所以这里Dynamic Web Module可以选择到2.5。

  如果碰到如下报错：

  cannot change version of project facet dyname web module to 2.5

  网上提供了两步解决办法：

  1) 把java compile改成1.6，看看行不行，不行的话再走第2步.

  

2).进入example/.settings/org.eclipse.wst.common.project.facet.core.xml文件

<installed facet="jst.web" version="2.3"/>

  把这里的version属性改成2.5,重启eclipse,简单粗暴。

  现在再进入Project Facets界面，可以看到Dynamic Web Module=2.5了

  

6.右键项目名称，选择末项Properties，进入面板选择web deployment assembly.

  因为项目部署时,不需要加入test,所以把和test有关的部署路径remove,如下图.

  wtp(web tool platform)不懂是什么,学习中.

  更改完后,记得点击apply.

  

7.添加jar包

  双击项目下pom.xml,选择Denpendcies选项卡,点击add按钮搜索

  我搜索时碰到搜索结果为0的情况,在网上搜索了一下解决办法,

  这里还需要做些maven的设置

  1).把download repository index updates on startup 勾选上,重启eclipse

  

2).window->show view :maven repositories,右键Global Repositories下的central

   勾选Full Index Enabled,然后再选择Rebuild Index

   

  再搜索spring-web应该就能看到搜索结果了.

   

搜索:

   spring-web,spring-tx,spring-webmvc,,spring-jdbc获取当下最新3.2.4的jar包

   需要定时器的可再搜索quartz, spring-context-support获取jar包

   mybatis(3.2.3),mybatis-spring(1.2.1)

   log4j, log4j-slf4j(转换用的实现类)

   完成后如下图:

   

  8.构建spring mvc

     web.xml,最simple配置,这里不考虑img,css,js等静态资源过滤了.

<?xml version="1.0" encoding="UTF-8"?>  <web-app 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"            version="2.5" >    <display-name>Archetype Created Web Application</display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <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>  <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>    <init-param>        <param-name>forceEncoding</param-name>        <param-value>true</param-value>    </init-param>  </filter>    <filter-mapping>      <filter-name>CharacterEncodingFilter</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>    <servlet>    <servlet-name>dispatcher</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>dispatcher</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping>  </web-app>

配置spring mvc: dispatcher-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: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"           >    <context:annotation-config />    <context:component-scan base-package="example" />    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">    <property name="messageConverters">        <list>            <bean class="org.springframework.http.converter.StringHttpMessageConverter">                <property name = "supportedMediaTypes">                      <list>                          <value>text/html;charset=UTF-8</value>                     </list>                   </property>               </bean>            </list>        </property>    </bean>     <!-- Support annotation -->    <mvc:annotation-driven />    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/WEB-INF/page/" />        <property name="suffix" value=".jsp" />    </bean></beans>

复制jdbc.proerties到src/main/resources/下

jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://127.0.0.1:3306/schemaName?useUnicode=true&characterEncoding=UTF-8jdbc.username=rootjdbc.password=root

applicationContext.xml下有两个配置是spring和mybatis集成用的

 1) 其中sqlSessionFactoryBean

  sqlSessionFactoryBean下的typeAliasesPackage属性就是提供一个命名空间,比如我这里所有和数据库表中属性对应的实体类全在example.model类下,那么定义

<property name="typeAliasesPackage" value="example.model" />

  我们在**Mapper.xml里配置各种方法返回值的时候就可以直接用

resultType="User"

 而不是写类的全名:

resultType="example.model.User"

2)MapperScannerConfigurer扫描我们指定的包,自动创建映射器

<pre name="code" class="html"><pre name="code" class="java"><property name="basePackage" value="example.mapper" />

<?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://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       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <context:property-placeholder location="classpath:jdbc.properties" />    <bean id="dataSource" class="org.apache.ibatis.datasource.pooled.PooledDataSource" destroy-method="forceCloseAll">        <property name="driver" value="${jdbc.driver}" />        <property name="url" value="${jdbc.url}" />        <property name="username" value="${jdbc.username}" />        <property name="password" value="${jdbc.password}" />    </bean>    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource" />    </bean>    <tx:annotation-driven />    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <property name="dataSource" ref="dataSource" />        <property name="typeAliasesPackage" value="example.model" />    </bean>    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">       <property name="basePackage" value="example.mapper" />       <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />    </bean></beans>

下面是文件目录:注意这里我设置Mapper接口类和映射器配置xml文件同名且在同一目录下.就无需在Mybatis的配置文件Configuration.xml中通过mapper标签来指定映射器配置文件了.

例如原来是需要在Configuration.xml中指定的

<mappers>        <mapper resource="example/mapper/UserMapper.xml" /></mappers>

因为现在把datasource配置在applicationContext.xml里了,mapper标签也不需要了,所以Configuration.xml这个文件我们暂时不需要了.

实体:User.java

package example.model;public class User {    private int id;    private String userName;    private String userAge;    private String userAddress;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public String getUserAge() {        return userAge;    }    public void setUserAge(String userAge) {        this.userAge = userAge;    }    public String getUserAddress() {        return userAddress;    }    public void setUserAddress(String userAddress) {        this.userAddress = userAddress;    }}

操作:userMapper.java

这里我把select的操作配置在了相应的xml文件里,

package example.mapper;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Options;import org.apache.ibatis.annotations.Update;import org.springframework.stereotype.Repository;import example.model.User;@Repositorypublic interface UserMapper {    public User selectUserById(int id);    @Insert("insert into user (userName, userAge, userAddress) values (#{userName},#{userAge},#{userAddress})")    @Options(useGeneratedKeys = true, keyProperty = "id")    public void insertUser(User user);    @Delete("delete from user where id = #{id}")    public void deleteUser(int id);    @Update("update user set userName = #{userName}, userAge = #{userAge}, userAddress = #{userAddress} where id = #{id}")    public void updateUser(User user);}

UserMapper.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"><mapper namespace="example.mapper.UserMapper">    <select id="selectUserById" parameterType="int" resultType="User">        select * from `user` where id = #{id}    </select></mapper>

UserServiceImpl.java,这里就做个简单的查询操作

package example.service.impl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import example.mapper.UserMapper;import example.model.User;import example.service.UserService;@Servicepublic class UserServiceImpl implements UserService {    @Autowired    private UserMapper userMapper;    @Override    public User getUser(int id) {        User user = userMapper.selectUserById(id);        return user;    }}

UserController.java,给JSP返回数据

package example.controller;import java.util.HashMap;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import example.model.User;import example.service.UserService;@Controller@RequestMapping(value = "/users")public class UserController {    @Autowired    private UserService userService;    @RequestMapping(value = "/{userId}", method = RequestMethod.GET)    public ModelAndView getUserDetail(@PathVariable("userId") int userId) {        User user = userService.getUser(userId);        ModelAndView mv = new ModelAndView();        Map<String, Object> modelMap = new HashMap<String, Object>();        modelMap.put("user", user);        mv.addAllObjects(modelMap);        mv.setViewName("user_detail");        return mv;    }}