spring mvc注解例子

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spring mvc注解

spring mvc 注解

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-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<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>

<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 />

<context:component-scan base-package="com.mvc.controller" />

<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" />

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

<bean id="sessionFactory"

class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

<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>

<list>

<value>com.mvc.entity</value>

</list>

</property>

</bean>

<bean id="transactionManager"

class="org.springframework.orm.hibernate3.HibernateTransactionManager">

</bean>

<bean id="dataSource"

class="org.springframework.jdbc.datasource.DriverManagerDataSource">

</bean>

</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>

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>

/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>

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>

<tr>

</tr>

<c:forEach items="${list}" var="student">

<td>

<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>

<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">

<table>

</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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Mybatis generator代码生成工具 | Spring3 MVC 学习笔记（三）文件上传

2012-07-05 18:09
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