dwr全称Direct Web Remoting原理将java代码转化成js对象，实现跨域访问

web.xml

    
    
     
      DWR (Direct Web Remoting)
       
     
      A Simple Demo DWR
       
     
          
      
       org.directwebremoting.servlet.DwrListener
        
         
     
          
      
       dwr-invoker
          
      
       org.directwebremoting.servlet.DwrServlet
              
      
             
       
        debug
             
       
        true
           
            
      
       1
        
          
     
          
      
       dwr-invoker
          
      
       /dwr/*
        
         
    

dwr.xml

package org.konghao.dwr.model;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.FileUtils;import org.apache.commons.io.FilenameUtils;import org.directwebremoting.WebContext;import org.directwebremoting.WebContextFactory;public class MyDwr {    public String hello(String world) {        System.out.println("hello "+world);        return "hello "+world;    }        public User load() {        User u = new User(1,"张三",new Group(1,"财务处"));        return u;    }        public List
    
      list() {        List
     
       users = new ArrayList
      
       ();        users.add(new User(1,"张三",new Group(1,"财务处")));        users.add(new User(2,"李四",new Group(2,"科技处")));        users.add(new User(3,"王五",new Group(3,"宣传部")));        return users;    }        public void add(User user) {        System.out.println(user);    }    public void deleteUser() {        throw new MyException("在删除用户的时候有错");    }        public int add(int a,int b) {        return a+b;    }        public String upload(InputStream is,String filename) throws IOException {        //WebContext可以获取HttpServlet的对象        WebContext wc = WebContextFactory.get();        HttpServletRequest req = wc.getHttpServletRequest();        String realpath = req.getSession().getServletContext().getRealPath("upload");        String fn = FilenameUtils.getName(filename);        String filepath = realpath+"/"+fn;        FileUtils.copyInputStreamToFile(is, new File(filepath));        return filepath;    }}
      
     
    

package org.konghao.dwr.model;public class MyException extends RuntimeException {    public MyException() {        super();        // TODO Auto-generated constructor stub    }    public MyException(String message, Throwable cause) {        super(message, cause);        // TODO Auto-generated constructor stub    }    public MyException(String message) {        super(message);        // TODO Auto-generated constructor stub    }    public MyException(Throwable cause) {        super(cause);        // TODO Auto-generated constructor stub    }}

package org.konghao.dwr.model;public class User {    private int id;    private String username;    private Group group;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public Group getGroup() {        return group;    }    public void setGroup(Group group) {        this.group = group;    }    public User(int id, String username, Group group) {        super();        this.id = id;        this.username = username;        this.group = group;    }    public User() {        super();    }    @Override    public String toString() {        return "User [id=" + id + ", username=" + username + ", group=" + group                + "]";    }}

package org.konghao.dwr.model;public class Group {    private int id;    private String name;            public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Group(int id, String name) {        super();        this.id = id;        this.name = name;    }    public Group() {        super();    }    @Override    public String toString() {        return "Group [id=" + id + ", name=" + name + "]";    }        }

无刷新上传文件

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>
    
     
     
      
       
        
         function upload() {    var file = dwr.util.getValue("myfile");    alert(file.value);    alert(file);    MyDwr.upload(file,file.value,function(data){        alert(data);    });}    
                 
         
        
       
      
     
    

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