在本人的这篇文章的基础上http://chenzheng8975.iteye.com/blog/1842080深入学习：
dwr工具类：<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/util.js"></script>
dwr转化对象和异常：
<convert converter="bean" match="com.cz.model.User"/>
<convert converter="bean" match="com.cz.model.Group"/>
<convert match="java.lang.Exception" converter="exception"/>
<convert converter="bean" match="java.lang.StackTraceElement"/>
MyDwr.java:
package com.cz.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<User> list() {
List<User> users = new ArrayList<User>();
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;
}
}
MyException.java:
package com.cz.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
}
}
***************************************************************
MyDwr.load(loadUser);
function loadUser(user) {
alert(user.id+","+user.username+","+user.group.name);
}
*************************************************************
MyDwr.list(listUser);
function listUser(users) {
for(var i=0;i<users.length;i++) {
alert(users[i].username+","+users[i].group.name);
}
}
******************************************************
var user = {id:1,username:"李四",group:{id:2,name:"网络中心"}};
MyDwr.add(user);
******************************************************
MyDwr.deleteUser({
callback:deleteUser,
errorHandler:function(msg,exception) {
alert(msg);
/*for(var ea in exception) {
alert(ea);
}
alert(exception.stackTrace);*/
alert(dwr.util.toDescriptiveString(exception,1));
}
});
function deleteUser(data) {
}
********************************************************
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
<script type="text/javascript" src="<%=request.getContextPath
()%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/util.js"></script>
<script type="text/javascript" src="<%=request.getContextPath
()%>/dwr/interface/MyDwr.js"></script>
<script type="text/javascript">
function calAdd() {
var a = dwr.util.getValue("a");
var b = dwr.util.getValue("b");
MyDwr.add(parseInt(a),parseInt(b),function(data){
alert(data);
});
}
function addAddress() {
var a = dwr.util.getValue("addressName");
var data = [{id:a,name:a}];
dwr.util.addOptions("address",data,"id","name");
}
function initAddress() {
dwr.util.removeAllOptions();
var data = [{id:1,name:"北京"},{id:2,name:"天津"},{id:3,name:"上海"}];
dwr.util.addOptions("address",data,"id","name");
}
function initUser() {
MyDwr.list(function(data){
dwr.util.addRows("user",data,cellFuncs,{ escapeHtml:false });
});
}
var cellFuncs=[
function(data){return data.id},
function(data){return data.username},
function(data){return data.group.name}
];
</script>
</head>
<body>
<input type="text" id="a"/>+<input type="text" id="b"/><input type="button"
value="获取" onclick="calAdd()">
<br/>
<select id="address">
</select>
<input type="button" value="初始化地址" onclick="initAddress()"/>
<input type="text" id="addressName"/><input type="button" value="添加"
onclick="addAddress()"/>
<table width="600" border="1">
<thead>
<tr>
<td>ID</td>
<td>username</td>
<td>groupName</td>
</tr>
</thead>
<tbody id="user">
</tbody>
</table>
<input type="button" value="初始化用户" onclick="initUser()"/>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
<script type="text/javascript" src="<%=request.getContextPath
()%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/util.js"></script>
<script type="text/javascript" src="<%=request.getContextPath
()%>/dwr/interface/MyDwr.js"></script>
<script type="text/javascript">
function upload() {
var file = dwr.util.getValue("myfile");
alert(file.value);
alert(file);
MyDwr.upload(file,file.value,function(data){
alert(data);
});
}
</script>
</head>
<body>
<input type="file" id="myfile"/>
<input type="button" value="上传文件" onclick="upload()"/>
</body>
</html>