dwr学习2
（1）前端java代码部分
<%@ 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>
<!-- 必须引入dwr的engine.js -->
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/util.js"></script>
<!-- 将java的类引入 -->
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/interface/UserService.js"></script>
<script type="text/javascript">
window.onload = init;
//配置全局异常的处理
dwr.engine.setErrorHandler(errorHandler);
function init() {
//在引入了util.js之后可以直接使用$("xxx")来获取id对象，但是通常不赞成使用，特别是在使用jquery之后
initTable();
}
function search() {
var id = document.getElementById("searchId").value;
UserService.load(id,function(data){
document.getElementById("searchResult").innerHTML = "搜索结果:"+data.name+"-->"+data.group.name;
});
}
function initTable() {
UserService.list(function(data){
var t = document.getElementById("users");
if(t.getElementsByTagName("tbody")[0])
t.removeChild(t.getElementsByTagName("tbody")[0]);
var tb = "<tbody>"
for(var i=0;i<data.length;i++) {
tb+="<tr><td>"+data[i].id+"</td><td>"+data[i].name+"</td><td>"+data[i].group.name+"</td></tr>"
}
tb+="</tbody>"
t.innerHTML=t.innerHTML+tb;
});
}
function addUser() {
var uid = document.getElementById("userId").value;
var uname = document.getElementById("username").value;
var gid = document.getElementById("groupId").value;
var gname = document.getElementById("groupName").value;
var u = {"id":uid,"name":uname,group:{"id":gid,"name":gname}};
UserService.add(u);
initTable();
}
function deleteUser() {
var did = document.getElementById("did").value;
/*UserService.deleteUser(did,{
callback:function(data){
initTable();
},
errorHandler:function(msg,e) {
alert(msg);
for(var eo in e) {
alert(eo+"---->"+e[eo]);
}
}
});*/
UserService.deleteUser(did,function(data){
initTable();
});
}
function errorHandler(msg,e) {
alert(msg);
for(var eo in e) {
alert(eo+"------>"+e[eo]);
}
}
</script>
</head>
<body>
<table id="users" border="1" width="700" align="center">
<thead>
<tr><td colspan="3">输入id:<input type="text" id="searchId"/><input type="button" value="search" id="searchBtn" onclick="search()"/></td></tr>
<tr><td>用户标识</td><td>用户名</td><td>用户所在组</td></tr>
</thead>
</table>
<p>
<input type="text" id="did"/><input type="button" value="删除" onclick="deleteUser()"/>
</p>
<p>
用户名:<input type="text" id="username"/> 用户id:<input type="text" id="userId"/><br/>
组名称:<input type="text" id="groupName"/> 组id:<input type="text" id="groupId"/><br/>
<input type="button" value="添加用户" onclick="addUser()"/>
</p>
<div id="searchResult"></div>
</body>
</html>（2）java代码部分
package org.konghao.service;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class UserService {
private static Map<Integer,User> users = new HashMap<Integer,User>();
static {
users.put(1, new User(1,"孙悟空",new Group(1,"取经组")));
users.put(2, new User(2,"猪八戒",new Group(1,"取经组")));
users.put(3, new User(3,"白骨精",new Group(2,"吃肉组")));
users.put(4, new User(4,"牛魔王",new Group(2,"吃肉组")));
}
public UserService() {
}
public User load(int id) {
return users.get(id);
}
public void add(User user) {
users.put(user.getId(), user);
}
public void deleteUser(int id) {
if(!users.containsKey(id)) throw new UserException("删除的用户不存在!");
users.remove(id);
}
public List<User> list() {
Set<Integer> keys = users.keySet();
List<User> us = new ArrayList<User>();
for(Integer key:keys) {
us.add(users.get(key));
}
return us;
}
}