dwr的第一个入门范例
dwr的第一个入门实例
几经周折，参考网上的各种入门实例，终于完成了自己的第一个DWR例子。好，不多说，回放一遍整个过程。
1.在myeclipse下建立一个web工程，取名为dwr，导入dwr.jar和commons-logging.jar包到lib目录下。
2.建立实例类User
package test;
public class User {
//登陆ID，主键唯一
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;
}
}
3.建立UserDao类
package test;
import java.util.HashMap;
import java.util.Map;
public class UserDAO {
//存放保存的数据
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);
}
}
4.建立DWRUserAccess 类
package test;
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);
}
}
5.修改web.xml配置文件
<?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"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- 配置DWR的核心Servlet --> <listener> <listener-class>org.directwebremoting.servlet.DwrListener</listener-class> </listener> <servlet> <!-- 指定DWR核心Servlet的名字 --> <servlet-name>dwr-invoker</servlet-name> <servlet-class> <!-- 指定DWR核心Servlet的实现类 --> org.directwebremoting.servlet.DwrServlet </servlet-class> <!-- 指定DWR核心Servlet处于调试状态 --> <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 指定核心Servlet的URL映射 --> <servlet-mapping> <servlet-name>dwr-invoker</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> </web-app>
6.建立dwr.xml文件，和web.xml在同级目录下
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd"> <dwr> <allow> <create creator="new" javascript="DWRUserAccess"> <param name="class" value="test.DWRUserAccess" /> </create> <convert converter="bean" match="test.User" /> </allow> </dwr>
7.编写JSP页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<TITLE>DWR测试</TITLE>
<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>
</BODY>
</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>