spring4.1.0+spring mvc4.1.0+spring data jpa1.7.0+maven整合

spring4.1.0已经正式发布了，整合一下使用spring mvc和spring 的jpa，之前的另一个项目有用到，感觉挺好用的，有减少了很多工作量，而且用起来简单，今天在搭建一个最新的。
首先从maven开始
1.pom.xml文件：

<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.jani.test</groupId>      <artifactId>demo</artifactId>      <version>0.0.1-SNAPSHOT</version>      <packaging>war</packaging>      <name>loveweir</name>      <description />      <properties>          <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>      </properties>      <dependencies>          <dependency>              <groupId>org.springframework</groupId>              <artifactId>spring-context</artifactId>              <version>4.1.0.RELEASE</version>          </dependency>          <dependency>              <groupId>org.springframework</groupId>              <artifactId>spring-orm</artifactId>              <version>4.1.0.RELEASE</version>          </dependency>          <dependency>              <groupId>org.springframework</groupId>              <artifactId>spring-webmvc</artifactId>              <version>4.1.0.RELEASE</version>          </dependency>          <dependency>              <groupId>org.hibernate</groupId>              <artifactId>hibernate-core</artifactId>              <version>4.3.6.Final</version>          </dependency>          <dependency>              <groupId>org.hibernate</groupId>              <artifactId>hibernate-entitymanager</artifactId>              <version>4.3.6.Final</version>          </dependency>          <dependency>              <groupId>org.springframework.data</groupId>              <artifactId>spring-data-jpa</artifactId>              <version>1.7.0.RELEASE</version>          </dependency>          <dependency>              <groupId>mysql</groupId>              <artifactId>mysql-connector-java</artifactId>              <version>5.1.32</version>          </dependency>          <dependency>              <groupId>com.alibaba</groupId>              <artifactId>druid</artifactId>              <version>1.0.9</version>          </dependency>          <dependency>              <groupId>com.alibaba</groupId>              <artifactId>fastjson</artifactId>              <version>1.1.41</version>          </dependency>          <dependency>              <groupId>commons-fileupload</groupId>              <artifactId>commons-fileupload</artifactId>              <version>1.3.1</version>          </dependency>          <dependency>              <groupId>junit</groupId>              <artifactId>junit-dep</artifactId>              <version>4.11</version>              <scope>test</scope>          </dependency>          <dependency>              <groupId>javax.servlet.jsp.jstl</groupId>              <artifactId>javax.servlet.jsp.jstl-api</artifactId>              <version>1.2.1</version>          </dependency>          <dependency>              <groupId>org.glassfish.web</groupId>              <artifactId>jstl-impl</artifactId>              <version>1.2</version>          </dependency>          <dependency>              <groupId>org.apache.commons</groupId>              <artifactId>commons-lang3</artifactId>              <version>3.3.2</version>          </dependency>          <dependency>          <groupId>db2jcc</groupId>          <artifactId>db2jcc</artifactId>          <version>8.2</version>       </dependency>      </dependencies>      <build>          <plugins>              <plugin>                  <artifactId>maven-compiler-plugin</artifactId>                  <version>2.3.2</version>                  <configuration>                      <source>1.6</source>                      <target>1.6</target>                  </configuration>              </plugin>              <plugin>                  <artifactId>maven-war-plugin</artifactId>                  <version>2.2</version>                  <configuration>                      <version>3.0</version>                      <failOnMissingWebXml>false</failOnMissingWebXml>                  </configuration>              </plugin>          </plugins>      </build>  </project>  

这里就不解释了，一看就明白了。
2.persistence.xml文件：
这个文件我就不解释放在哪里了。

<?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" id="WebApp_ID" version="3.0">  <display-name>loveweir</display-name>  <!-- 默认的spring配置文件是在WEB-INF下的applicationContext.xml -->    <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>OpenEntityManagerInViewFilter</filter-name>        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>        <init-param>            <param-name>entityManagerFactoryBeanName</param-name>            <param-value>entityManagerFactory</param-value>        </init-param>        <init-param>            <param-name>persistenceUnitName</param-name>            <param-value>activitioa</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>OpenEntityManagerInViewFilter</filter-name>        <url-pattern>*.do</url-pattern>    </filter-mapping><!-- 配置spring mvc的相关内容，此处的servlet-name任意，但必须有<your servlet-name>-servlet.xml与之对应 -->    <servlet>        <servlet-name>loveweir</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>loveweir</servlet-name>        <!-- 配置所有的页面 -->        <url-pattern>*.do</url-pattern>    </servlet-mapping>    <!-- 配置过滤器，同时把所有的请求都转为utf-8编码 -->    <filter>        <filter-name>Spring character encoding filter</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>Spring character encoding filter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list></web-app>

配置就这些了，下面就是怎么整合spring data jpa,
spring data jpa 主要的作用是简化了做持久层的操作，spring data jpa做了非常好的封装。

public interface MenuDao extends PagingAndSortingRepository<Tmenu, String>{      @Query("select o from Tmenu o where o.tmenu is null")      public List<Tmenu> getListIsNull();      @Query("select o from Tmenu o where o.tmenu.id=?")      public List<Tmenu> getListById(String id);  }  

例如这样一个接口，只需要继承PagingAndSortingRepository就ok，就可以实现CRUD还包括分页等持久化工作。
大家想了解的更多可以到网上搜搜：http://www.ibm.com/developerworks/cn/opensource/os-cn-spring-jpa/
好了就上面的一个接口就完成了持久层的工作，业务层不变需要service和其实现类

public interface MenuService {      public List<MenuVo> tree();      public List<MenuVo> gettrees(String id);      public Tmenu find(String id);      public void save(Tmenu tmenu);      public void delete(String id);  }  

@Service("menuService")@Transactionalpublic class MenuServiceImpl implements MenuService {    @Autowired    private MenuDao menuDao;    @Transactional(readOnly=true,propagation=Propagation.REQUIRED)    public List<MenuVo> tree() {        List<Tmenu> tmenus = (List<Tmenu>) menuDao.findAll();        List<MenuVo> menus = new ArrayList<MenuVo>();        MenuVo m = null;        for (Tmenu tmenu : tmenus) {            m = new MenuVo();            m.setId(tmenu.getId());            m.setIconcls(tmenu.getIconcls());            m.setName(tmenu.getText());            m.setUrl(tmenu.getUrl());            Tmenu t = tmenu.getTmenu();            if (t!=null) {                m.setPid(t.getId());                m.setPname(t.getText());            }            menus.add(m);        }        return menus;    }    @Transactional(readOnly=true,propagation=Propagation.REQUIRED)    public List<MenuVo> gettrees(String id) {        List<Tmenu> tmenus = null;        if (id==null) {            tmenus = menuDao.getListIsNull();        }else {            tmenus = menuDao.getListById(id);        }        List<MenuVo> menus = new ArrayList<MenuVo>();        MenuVo m = null;        for (Tmenu tmenu : tmenus) {            m = new MenuVo();            BeanUtils.copyProperties(tmenu, m);            Set<Tmenu> tmenus2 = tmenu.getTmenus();            Map<String, Object> attributes = new HashMap<String, Object>();            attributes.put("url", tmenu.getUrl());            m.setAttributes(attributes);            if (tmenus2!=null && !tmenus2.isEmpty()) {                m.setState("closed");            }else {                m.setState("open");            }            menus.add(m);        }        return menus;    }    @Transactional(readOnly=true,propagation=Propagation.REQUIRED)    public Tmenu find(String id) {        return menuDao.findOne(id);    }    public void save(Tmenu tmenu) {        menuDao.save(tmenu);    }    public void delete(String id) {        menuDao.delete(id);    }}

从实现类中可以看到spring data jpa 对持久层的封装是如此的完美。
控制层我就不写了。
这次整合出现的问题最多的是json格式的获取，也就是loveweir-servlet.xml的配置问题，其他都很容易配置实现。