引用
DWR(Direct Web Remoting)是一个WEB远程调用框架.利用这个框架可以让AJAX开发变得很简单.利用DWR可以在客户端利用JavaScript直接调用服务端的Java方法并返回值给JavaScript就好像直接本地客户端调用一样(DWR根据Java类来动态生成JavaScrip代码).它的最新版本DWR0.6添加许多特性如:支持Dom Trees的自动配置,支持Spring(JavaScript远程调用spring bean),更好浏览器支持,还支持一个可选的commons-logging日记操作.
以上摘自open-open,它通过反射,将java翻译成javascript,然后利用回调机制,轻松实现了javascript调用Java代码。
User.java
package com.makey;
public class User {
private String id;
//姓名
private String name;
//口令
private String password;
//电子邮件
private String email;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
UserDao.java
package com.makey;
import java.util.HashMap;
import java.util.Map;
public class UserDao {
private static Map dataMap = new HashMap();
//持久用户
public boolean save(User user) {
if (dataMap.containsKey(user.getId()))
return false;
System.out.println("下面开始保存用户");
System.out.println("id:"+user.getId());
System.out.println("password:"+user.getPassword());
System.out.println("name:"+user.getName());
System.out.println("email:"+user.getEmail());
dataMap.put(user.getId(), user);
System.out.println("用户保存结束");
return true;
}
//查找用户
public User find(String id) {
return (User)dataMap.get(id);
}
}
DWRUserAccess.java
package com.makey;
public class DWRUserAccess {
UserDao userDao = new UserDao();
public boolean save(User user) {
return userDao.save(user);
}
public User find(String id) {
return userDao.find(id);
}
}
dwr.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
<allow>
<create creator="new" javascript="DWRUserAccess">
<param name="class" value="com.makey.DWRUserAccess" />
</create>
<convert converter="bean" match="com.makey.User" />
</allow>
</dwr>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>scriptCompressed</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<TITLE>DWR测试</TITLE>
<meta http-equiv=Content-Type content="text/html; charset=gbk">
<script src="dwr/engine.js"></script>
<script src="dwr/util.js"></script>
<script src="dwr/interface/DWRUserAccess.js"></script>
</HEAD>
<BODY>
<B>用户注册</B><br>
------------------------------------------------
<Br>
<form name="regForm">
登陆ID:<input type="text" name="id"><br>
口 令:<input type="password" name="password"><br>
姓 名:<input type="text" name="name"><br>
电子邮件:<input type="text" name="email"><br>
<input type="button" name="submitBtn" value="提交" onclick="OnSave()"><br>
</form>
<br>
<br><B>用户查询</B><br>
------------------------------------------------
<Br>
<form name="queryForm">
登陆ID:<input type="text" name="id"><br>
<input type="button" name="submitBtn" value="提交" onclick="OnFind()"><br>
</form>
<br>
</html>
<SCRIPT LANGUAGE="JavaScript">
<!--
function saveFun(data) {
if (data) {
alert("注册成功!");
} else {
alert("登陆ID已经存在!");
}
}
function OnSave() {
var userMap = {};
userMap.id = regForm.id.value;
userMap.password = regForm.password.value;
userMap.name = regForm.name.value;
userMap.email = regForm.email.value;
DWRUserAccess.save(userMap, saveFun);
}
function findFun(data) {
if (data == null) {
alert("无法找到用户:"+queryForm.id.value);
return;
}
alert("找到用户,nid:"+data.id+",npassword:"+data.password+",nname:"+data.name+",nemail:"+data.email);
}
function OnFind() {
DWRUserAccess.find(queryForm.id.value, findFun);
}
//-->
</SCRIPT>
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