spring mvc注解例子
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?弃用了struts，用spring mvc框架做了几个项目，感觉都不错，而且使用了注解方式，可以省掉一大堆配置文件。本文主要介绍使用注解方式配置的spring mvc，之前写的spring3.0 mvc和rest小例子没有介绍到数据层的内容，现在这一篇补上。下面开始贴代码。
文中用的框架版本：spring 3,hibernate 3,没有的，自己上网下。
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>??<!--?这里在配成spring,下边也要写一个名为spring-servlet.xml的文件，主要用来配置它的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?/>??????????<!--?把标记了@Controller注解的类转换为bean?-->???????????<context:component-scan?base-package="com.mvc.controller"?/>???????<!--?启动Spring?MVC的注解功能，完成请求和注解POJO的映射?-->???????????<bean?class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"?/>????????????????????<!--?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"???????????????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代码
<?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"?/>??<!--?自动扫描所有注解该路径?-->??????<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><!--?扫描实体类，也就是平时所说的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的实现?-->????<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数据库连接配置
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???
配置已经完成，下面开始例子
先在数据库建表，例子用的是mysql数据库
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`)???)???
建好表后，生成实体类
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层实现
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只有一个类的实现，直接供其它service层调用，如果你想更换为其它的Dao实现，也只需修改这里的配置就行了。
开始写view页面，WEB-INF/view下新建页面student.jsp，WEB-INF/view这路径是在spring-servlet.xml文件配置的，你可以配置成其它，也可以多个路径。student.jsp代码
<%@?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){???$.ajax(?{???????type?:?"POST",???????url?:?"<%=request.getContextPath()%>/student.do?method=del&id="?+?id,???????dataType:?"json",???????success?:?function(data)?{???????????if(data.del?==?"true"){???????????????alert("删除成功！");???????????????$("#"?+?id).remove();???????????}???????????else{???????????????alert("删除失败！");???????????}???????},???????error?:function(){???????????alert("网络连接出错！");???????}???});???}???//?--></script>??</head>??<body>????<input?id="add"?type="button"?onclick="add()"?value="添加"/>??<table?>??????<tr>??????????<td>序号</td>??????????<td>姓名</td>??????????<td>密码</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="${student.psw}"/></td>??????????<td>??????????????<input?type="button"?value="编辑"/>????????????????????<input?type="button"?onclick="del('<c:out?value="${student.id}"/>')"?value="删除"/>??????????</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>学生添加</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>密码</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"?onclick="turnback()"?value="返回"?/>?</td></tr>??</table>????</form>??</body>??</html>???
controller类实现，只需把注解写上，spring就会自动帮你找到相应的bean，相应的注解标记意义，不明白的，可以自己查下@Service，@Controller，@Entity等等的内容。
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",?"添加失败");???????????}??????????????????????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类实现
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，例子写完。有其它业务内容，只需直接新建view，并实现相应comtroller和service就行了，配置和dao层的内容基本不变，也就是每次只需写jsp（view），controller和service调用dao就行了。
怎样，看了这个，spring mvc是不是比ssh实现更方便灵活。
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http://www.blogjava.net/pengo/archive/2010/11/28/339229.html
public?interface?EntityDao?
????public?List<Object>?createQuery(final?String?queryString)?