基于注解的SpringMVC整合JPA

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.