spring

spring mvc註解例子 轉載自http://www.blogjava.net/pengo/archive/2010/11/28/339229.html
棄用了struts，用spring mvc框架做了幾個項目，感覺都不錯，而且使用了註解方式，可以省掉一大堆配置文件。本文主要介紹使用註解方式配置的spring mvc，之前寫的spring3.0 mvc和rest小例子沒有介紹到數據層的內容，現在這一篇補上。下面開始貼代碼。
文中用的框架版本：spring 3,hibernate 3,沒有的，自己上網下。

web.xml配置：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>s3h3</display-name>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name> <!-- 這裏在配成spring,下邊也要寫一個名爲spring-servlet.xml的文件，主要用來配置它的controller -->
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>


spring-servlet,主要配置controller的信息

<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<context:annotation-config />
<!-- 把標記了@Controller註解的類轉換爲bean -->
<context:component-scan base-package="com.mvc.controller" />
<!-- 啓動Spring MVC的註解功能，完成請求和註解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

<!-- 對模型視圖名稱的解析，即在模型視圖名稱添加前後綴 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/view/" p:suffix=".jsp" />

<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
p:defaultEncoding="utf-8" />
</beans>


applicationContext.xml代碼

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

<context:annotation-config />
<context:component-scan base-package="com.mvc" /> <!-- 自動掃描所有註解該路徑 -->

<context:property-placeholder location="classpath:/hibernate.properties" />

<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">${dataSource.dialect}</prop>
<prop key="hibernate.hbm2ddl.auto">${dataSource.hbm2ddl.auto}</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
<property name="packagesToScan">
<list>
<value>com.mvc.entity</value><!-- 掃描實體類，也就是平時所說的model -->
</list>
</property>
</bean>

<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
<property name="dataSource" ref="dataSource" />
</bean>

<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${dataSource.driverClassName}" />
<property name="url" value="${dataSource.url}" />
<property name="username" value="${dataSource.username}" />
<property name="password" value="${dataSource.password}" />
</bean>
<!-- Dao的實現 -->
<bean id="entityDao" class="com.mvc.dao.EntityDaoImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<tx:annotation-driven mode="aspectj"/>

<aop:aspectj-autoproxy/>
</beans>


hibernate.properties數據庫連接配置

dataSource.password=123
dataSource.username=root
dataSource.databaseName=test
dataSource.driverClassName=com.mysql.jdbc.Driver
dataSource.dialect=org.hibernate.dialect.MySQL5Dialect
dataSource.serverName=localhost:3306
dataSource.url=jdbc:mysql://localhost:3306/test
dataSource.properties=user=${dataSource.username};databaseName=${dataSource.databaseName};serverName=${dataSource.serverName};password=${dataSource.password}
dataSource.hbm2ddl.auto=update


配置已經完成，下面開始例子
先在數據庫建表，例子用的是mysql數據庫

CREATE TABLE `test`.`student` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(45) NOT NULL,
`psw` varchar(45) NOT NULL,
PRIMARY KEY (`id`)
)


建好表後，生成實體類

package com.mvc.entity;

import java.io.Serializable;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "student")
public class Student implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false)
private Integer id;
@Column(name = "name")
private String user;
@Column(name = "psw")
private String psw;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}

public String getUser() {
return user;
}
public void setUser(String user) {
this.user = user;
}
public String getPsw() {
return psw;
}
public void setPsw(String psw) {
this.psw = psw;
}
}

Dao層實現
package com.mvc.dao;

import java.util.List;

public interface EntityDao {
public List<Object> createQuery(final String queryString);
public Object save(final Object model);
public void update(final Object model);
public void delete(final Object model);
}

package com.mvc.dao;

import java.util.List;

import org.hibernate.Query;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class EntityDaoImpl extends HibernateDaoSupport implements EntityDao{
public List<Object> createQuery(final String queryString) {
return (List<Object>) getHibernateTemplate().execute(
new HibernateCallback<Object>() {
public Object doInHibernate(org.hibernate.Session session)
throws org.hibernate.HibernateException {
Query query = session.createQuery(queryString);
List<Object> rows = query.list();
return rows;
}
});
}
public Object save(final Object model) {
return getHibernateTemplate().execute(
new HibernateCallback<Object>() {
public Object doInHibernate(org.hibernate.Session session)
throws org.hibernate.HibernateException {
session.save(model);
return null;
}
});
}
public void update(final Object model) {
getHibernateTemplate().execute(new HibernateCallback<Object>() {
public Object doInHibernate(org.hibernate.Session session)
throws org.hibernate.HibernateException {
session.update(model);
return null;
}
});
}
public void delete(final Object model) {
getHibernateTemplate().execute(new HibernateCallback<Object>() {
public Object doInHibernate(org.hibernate.Session session)
throws org.hibernate.HibernateException {
session.delete(model);
return null;
}
});
}
}

Dao在applicationContext.xml注入
<bean id="entityDao" class="com.mvc.dao.EntityDaoImpl">
<property name="sessionFactory" ref="sessionFactory" />
</bean>


Dao只有一個類的實現，直接供其它service層調用，如果你想更換爲其它的Dao實現，也只需修改這裏的配置就行了。
開始寫view頁面，WEB-INF/view下新建頁面student.jsp，WEB-INF/view這路徑是在spring-servlet.xml文件配置的，你可以配置成其它，也可以多個路徑。student.jsp代碼

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ include file="/include/head.jsp"%>
<!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>添加</title>
<script language="javascript" src="<%=request.getContextPath()%><!--
/script/jquery.min.js">
// --></script>
<style><!--
table{ border-collapse:collapse; }
td{ border:1px solid #f00; }
--></style><style mce_bogus="1">table{ border-collapse:collapse; }
td{ border:1px solid #f00; }</style>
<script type="text/javascript"><!--
function add(){
window.location.href="<%=request.getContextPath() %>/student.do?method=add";
}

function del(id){
$.ajax( {
type : "POST",
url : "<%=request.getContextPath()%>/student.do?method=del&id=" + id,
dataType: "json",
success : function(data) {
if(data.del == "true"){
alert("刪除成功！");
$("#" + id).remove();
}
else{
alert("刪除失敗！");
}
},
error :function(){
alert("網絡連接出錯！");
}
});
}
// --></script>
</head>
<body>

<input id="add" type="button" οnclick="add()" value="添加"/>
<table >
<tr>
<td>序號</td>
<td>姓名</td>
<td>密碼</td>
<td>操作</td>
</tr>
<c:forEach items="${list}" var="student">
<tr id="<c:out value="${student.id}"/>">
<td><c:out value="${student.id}"/></td>
<td><c:out value="${student.user}"/></td>
<td><c:out value="${student.psw}"/></td>
<td>
<input type="button" value="編輯"/>
<input type="button" οnclick="del('<c:out value="${student.id}"/>')" value="刪除"/>
</td>
</tr>
</c:forEach>

</table>
</body>
</html>


student_add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ include file="/include/head.jsp"%>
<!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>學生添加</title>
<mce:script type="text/javascript"><!--
function turnback(){
window.location.href="<%=request.getContextPath() %>/student.do";
}
// --></mce:script>
</head>
<body>
<form method="post" action="<%=request.getContextPath() %>/student.do?method=save">
<div><c:out value="${addstate}"></c:out></div>
<table>
<tr><td>姓名</td><td><input id="user" name="user" type="text" /></td></tr>
<tr><td>密碼</td><td><input id="psw" name="psw" type="text" /></td></tr>
<tr><td colSpan="2" align="center"><input type="submit" value="提交"/><input type="button" οnclick="turnback()" value="返回" /> </td></tr>
</table>

</form>
</body>
</html>


controller類實現，只需把註解寫上，spring就會自動幫你找到相應的bean，相應的註解標記意義，不明白的，可以自己查下@Service，@Controller，@Entity等等的內容。

package com.mvc.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.mvc.entity.Student;
import com.mvc.service.StudentService;

@Controller
@RequestMapping("/student.do")
public class StudentController {
protected final transient Log log = LogFactory
.getLog(StudentController.class);
@Autowired
private StudentService studentService;
public StudentController(){

}

@RequestMapping
public String load(ModelMap modelMap){
List<Object> list = studentService.getStudentList();
modelMap.put("list", list);
return "student";
}

@RequestMapping(params = "method=add")
public String add(HttpServletRequest request, ModelMap modelMap) throws Exception{
return "student_add";
}

@RequestMapping(params = "method=save")
public String save(HttpServletRequest request, ModelMap modelMap){
String user = request.getParameter("user");
String psw = request.getParameter("psw");
Student st = new Student();
st.setUser(user);
st.setPsw(psw);
try{
studentService.save(st);
modelMap.put("addstate", "添加成功");
}
catch(Exception e){
log.error(e.getMessage());
modelMap.put("addstate", "添加失敗");
}

return "student_add";
}

@RequestMapping(params = "method=del")
public void del(@RequestParam("id") String id, HttpServletResponse response){
try{
Student st = new Student();
st.setId(Integer.valueOf(id));
studentService.delete(st);
response.getWriter().print("{\"del\":\"true\"}");
}
catch(Exception e){
log.error(e.getMessage());
e.printStackTrace();
}
}
}


service類實現

package com.mvc.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.mvc.dao.EntityDao;
import com.mvc.entity.Student;

@Service
public class StudentService {
@Autowired
private EntityDao entityDao;

@Transactional
public List<Object> getStudentList(){
StringBuffer sff = new StringBuffer();
sff.append("select a from ").append(Student.class.getSimpleName()).append(" a ");
List<Object> list = entityDao.createQuery(sff.toString());
return list;
}

public void save(Student st){
entityDao.save(st);
}
public void delete(Object obj){
entityDao.delete(obj);
}
}

OK，例子寫完。有其它業務內容，只需直接新建view，並實現相應comtroller和service就行了，配置和dao層的內容基本不變，也就是每次只需寫jsp（view），controller和service調用dao就行了。

怎樣，看了這個，spring mvc是不是比ssh實現更方便靈活。