dwr全稱Direct Web Remoting原理將java代碼轉化成js對象，實現跨域訪問

web.xml<?xml ?version="1.0"?encoding="UTF-8"?>

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">

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<?xml ?version="1.0"?encoding="UTF-8"?>

dwr?PUBLIC?"-//GetAhead?Limited//DTD?Direct?Web?Remoting?3.0//EN"?"http://getahead.org/dwr/dwr30.dtd">

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,"張三",new?Group(1,"財務處"));

return?u;

}

public?List?list()?{

List?users?=?new?ArrayList();

users.add(new?User(1,"張三",new?Group(1,"財務處")));

users.add(new?User(2,"李四",new?Group(2,"科技處")));

users.add(new?User(3,"王五",new?Group(3,"宣傳部")));

return?users;

}

public?void?add(User?user)?{

System.out.println(user);

}

public?void?deleteUser()?{

throw?new?MyException("在刪除用戶的時候有錯");

}

public?int?add(int?a,int?b)?{

return?a+b;

}

public?String?upload(InputStream?is,String?filename)?throws?IOException?{

//WebContext可以獲取HttpServlet的對象

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?+?"]";

}

}

無刷新上傳文件

pageEncoding="UTF-8"%>

html?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN"?"http://www.w3.org/TR/html4/loose.dtd">

Insert?title?here

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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