基于注解的SpringMVC整合JPA
转载位置：http://www.blogjava.net/sxyx2008/archive/2010/11/02/336768.html
实体类 Department package com.sj.bean; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity @Table(name="department",catalog="sj") public class Department { private int id; private String name; private Set<Employee> sets; @Id @Column(name="id") @GeneratedValue(strategy=GenerationType.AUTO) public int getId() { return id; } public void setId(int id) { this.id = id; } @Column(name="name") public String getName() { return name; } public void setName(String name) { this.name = name; } @OneToMany(mappedBy="department",cascade=CascadeType.ALL) public Set<Employee> getSets() { return sets; } public void setSets(Set<Employee> sets) { this.sets = sets; } } Employee package com.sj.bean; import java.io.Serializable; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; @SuppressWarnings("serial") @Entity @Table(name="employee",catalog="sj") public class Employee implements Serializable{ private int id; private String name; private Department department; @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="id") public int getId() { return id; } public void setId(int id) { this.id = id; } @Column(name="name") public String getName() { return name; } public void setName(String name) { this.name = name; } @ManyToOne(cascade=CascadeType.ALL) @JoinColumn(name="deptid") public Department getDepartment() { return department; } public void setDepartment(Department department) { this.department = department; } } BaseDAO package com.sj.dao; import java.util.List; public interface BaseDAO<T> { List<T> listAll(); Object findById(Class<T> c,int id); boolean save(Object object); boolean update(Object object); boolean delete(Object object); } BaseDAOImpl package com.sj.dao; import java.util.List; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.Query; import org.springframework.stereotype.Component; @Component("baseDAO") public class BaseDAOImpl<T> implements BaseDAO<T> { @PersistenceContext(unitName="sjPU") private EntityManager entityManager; public boolean delete(Object object) { try { entityManager.remove(object); return true; } catch (Exception e) { e.printStackTrace(); } return false; } public Object findById(Class<T> c,int id) { try { return entityManager.find(c, id); } catch (Exception e) { e.printStackTrace(); } return null; } public boolean save(Object object) { try { entityManager.persist(object); return true; } catch (Exception e) { e.printStackTrace(); } return false; } public boolean update(Object object) { try { entityManager.merge(object); return true; } catch (Exception e) { e.printStackTrace(); } return false; } @SuppressWarnings("unchecked") public List<T> listAll() { try { Query query=entityManager.createQuery(" from Employee "); return query.getResultList(); } catch (Exception e) { e.printStackTrace(); } return null; } } BaseService package com.sj.service; import java.util.List; public interface BaseService<T> { List<T> listAll(); Object findById(Class<T> c,int id); boolean save(Object object); boolean update(Object object); boolean delete(Object object); } BaseServiceImpl package com.sj.service; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Component; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.sj.dao.BaseDAO; @Component("baseServiceImpl") public class BaseServiceImpl<T> implements BaseService<T>{ @Resource(name="baseDAO") private BaseDAO<T> baseDAO; public BaseDAO<T> getBaseDAO() { return baseDAO; } public void setBaseDAO(BaseDAO<T> baseDAO) { this.baseDAO = baseDAO; } @Transactional(propagation=Propagation.REQUIRED) public boolean delete(Object object) { return baseDAO.delete(object); } @Transactional(propagation=Propagation.REQUIRED) public Object findById(Class<T> c, int id) { return baseDAO.findById(c, id); } @Transactional(propagation=Propagation.REQUIRED) public List<T> listAll() { return baseDAO.listAll(); } @Transactional(propagation=Propagation.REQUIRED) public boolean save(Object object) { return baseDAO.save(object); } @Transactional(propagation=Propagation.REQUIRED) public boolean update(Object object) { return baseDAO.update(object); } } EmployeeAction package com.sj.action; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.servlet.ModelAndView; import com.sj.bean.Employee; import com.sj.service.BaseService; @Controller @RequestMapping("/employee.action") public class EmployeeAction { @SuppressWarnings("unchecked") @Resource(name="baseServiceImpl") private BaseService service; @SuppressWarnings("unchecked") @RequestMapping(method=RequestMethod.GET,params="method=listAll") public ModelAndView listAll(){ List<Employee> list=service.listAll(); return new ModelAndView("list").addObject("list", list); } @ResponseBody @RequestMapping(params="method=listOther") public String listOther(){ String str="<font color='red'>HelloWorld</font>"; return str; } } TestApp package com.sj.test; import javax.annotation.Resource; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.sj.bean.Department; import com.sj.bean.Employee; import com.sj.service.BaseService; @ContextConfiguration(locations="file:D:\\Program Files\\MyEclipse 8.5-workspace\\sj\\WebRoot\\WEB-INF\\applicationContext.xml") @RunWith(SpringJUnit4ClassRunner.class) public class TestApp { @SuppressWarnings("unchecked") @Resource(name="baseServiceImpl") BaseService baseService; @Test public void save(){ Employee employee=new Employee(); employee.setName("张三"); Department department=new Department(); department.setName("软件测试组"); employee.setDepartment(department); baseService.save(employee); } @SuppressWarnings("unchecked") @Test public void query(){ Employee employee=(Employee) baseService.findById(Employee.class, 2); System.out.println(employee.getId()+"\t"+employee.getName()+"\t"+employee.getDepartment().getName()); } } applicationContext.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:annotation-config/> <context:component-scan base-package="com.sj.*"/> <aop:aspectj-autoproxy/> <tx:annotation-driven transaction-manager="transactionManager" /> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="persistenceUnitName" value="sjPU" /> <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml"></property> </bean> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> </beans> dispatcherServlet-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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.sj.action"/> <bean id="defaultAnnotationHandlerMapping" class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/> <bean id="annotationMethodHandlerAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=utf-8</value> <value>text/xml</value> <value>text/plain</value> </list> </property> </bean> </list> </property> </bean> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="suffix" value=".jsp"></property> <property name="prefix" value="/"></property> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> </bean> </beans> web.xml <?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"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> </web-app> src/META-INF/persistence.xml <?xml version="1.0" encoding="UTF-8"?> <persistence 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_1_0.xsd" version="1.0"> <persistence-unit name="sjPU" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <properties> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/sj" /> <property name="hibernate.connection.username" value="root" /> <property name="hibernate.connection.password" value="root" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.format_sql" value="true" /> <property name="hibernate.hbm2ddl.auto" value="update" /> </properties> </persistence-unit> </persistence> list.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>雇员信息列表</title> </head> <body> <c:if test="${empty requestScope.list}"> 对不起,没有要显示的记录!!!! </c:if> <c:if test="${!empty requestScope.list}"> <c:forEach items="${requestScope.list}" var="s"> <c:out value="${s.id}"/> <c:out value="${s.name}"/> <c:out value="${s.department.name}"/> <br/> </c:forEach> </c:if> </body> </html> 这里重点关注applicationContext.xml、dispatcherServlet-servlet.xml、EmployeeAction。其中dispatcherServlet-servlet.xml文件的命名规则遵循web.xml中配置的dispatcherServlet servlet的servlet-name属性的值。dispatcherServlet-servlet.xml里面配置了开启SpringMVC的注解解析器以及视图渲染器，和处理response时返回给浏览器的头信息.
