spring mvc注解例子

 

 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。

 

 

 

 

 

 

 

 

 

 

 

http://www.blogjava.net/pengo/archive/2010/11/28/339229.html

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