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，我用的myeclipse2014.
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>loveweir</groupId>
<artifactId>loveweir</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"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="loveweir">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
<!--配置Hibernate方言 -->
<!-- <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> -->
<property name="hibernate.dialect" value="org.hibernate.dialect.DB2Dialect" />
<!--配置数据库驱动 -->
<!-- <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> -->
<property name="hibernate.connection.driver_class" value="com.ibm.db2.jcc.DB2Driver" />
<!--配置数据库用户名 -->
<property name="hibernate.connection.username" value="db2admin" />
<!--配置数据库密码 -->
<property name="hibernate.connection.password" value="wiseknitssap" />
<!--配置数据库url -->
<!-- <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/loveweir?useUnicode=true&characterEncoding=UTF-8" /> -->
<property name="hibernate.connection.url" value="jdbc:db2://172.168.1.20:50000/wk_prod" />
<!--设置外连接抓取树的最大深度 -->
<property name="hibernate.max_fetch_depth" value="3" />
<!--自动输出schema创建DDL语句 -->
<!-- <property name="hibernate.hbm2ddl.auto" value="update" /> -->
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<property name="javax.persistence.validation.mode" value="none"/>
</properties>
</persistence-unit>
</persistence>
我用的数据库是ibm db2 ，大家自行使用。
3.applicationContext.xml文件：
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd">
<context:annotation-config/>
<context:component-scan base-package="com.loveweir"/>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="loveweir"></property>
<property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"></property>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"></property>
<property name="database" value="MYSQL"></property>
</bean>
</property>
</bean>
<!-- 自动扫描并注入Spring Data JPA -->
<jpa:repositories base-package="com.loveweir.dao" entity-manager-factory-ref="entityManagerFactory" transaction-manager-ref="transactionManager">
</jpa:repositories>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="false"/>
</beans>
4.loveweir-servlet.xml文件：
<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<context:component-scan base-package="com.loveweir.controller"/>
<bean id="fastJsonHttpMessageConverter"
class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json</value>
</list>
</property>
</bean>
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="fastJsonHttpMessageConverter" />
</list>
</property>
</bean>
<!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 支持上传文件 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
</beans>
这里想说的是不要加：<mvc:annotation-driven></mvc:annotation-driven> 这个东西，
我在这个地方出现的问题是加了这个东西回报这样的错误：
Failed to load resource: the server responded with a status of 406 (Not Acceptable)
昨天弄了一天网上看了好多帖子都不行，今天有测试把<mvc:annotation-driven></mvc:annotation-driven>去掉，
没想到json就获取到了。
5.web.xml文件：
<?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")
@Transactional
public 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。
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