spring

spring mvc注解例子 转载自http://www.blogjava.net/pengo/archive/2010/11/28/339229.html
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。