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结合DWR获取远程URL数据

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作者 正文
   发表时间:2008-04-28  
DWR
bean.java
package com.cw.entity;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


public class Bean {

	private String[] citys = new String[] { "杭州", "上海", "香港", "武汉", "南京" };

	public String[] getCitys() {
		return this.citys;
	}

	public String sendPost(String url) {
		String result = "";
		try {
			URL httpurl = new URL(url);
			HttpURLConnection httpConn = (HttpURLConnection) httpurl
					.openConnection();
			httpConn.setDoInput(true);
			BufferedReader in = new BufferedReader(new InputStreamReader(
					httpConn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("没有结果!" + e);
		}
		return result;
	}

}


index.jsp
<%@ page language="java" pageEncoding="gbk"%>
<%
	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>
		<base href="<%=basePath%>">
		<title>My JSP 'index.jsp' starting page</title>
		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
		<script type="text/javascript" src="dwr/interface/bean.js"></script>
		<script type="text/javascript" src="dwr/engine.js"></script>
		<script type="text/javascript" src="dwr/util.js"></script>

		<style type="text/css">
			.tips-loading {
	PADDING-RIGHT: 3px; PADDING-LEFT: 3px; BACKGROUND: url(img/reg0.gif) lightyellow no-repeat 3px center; PADDING-BOTTOM: 1px; OVERFLOW: hidden; WIDTH: 300px; COLOR: #808080; TEXT-INDENT: 20px; LINE-HEIGHT: 16px; PADDING-TOP: 2px
}
.tips-pass {
	BACKGROUND: url(img/reg4.gif) #e9ffeb no-repeat 0px -2px; COLOR: #333
}
		</style>
	</head>
	<body>
		<div
			style="position:absolute; left: 14px; top: 49px; width: 968px; height: 70px; background:#CCCCCC">
			<label style="position:absolute; left: 52px; top: 22px;">
				<input type="text" name="url" size="50" value="http://www.baidu.com">
			</label>
			<label
				style="position:absolute; left: 422px; top: 21px; width: 140px;">
				<input name="Input" type="submit" value="获取内容" onClick="getData()">
			</label>
			<div id="status" style="position:absolute; width:278px; left: 501px; top: 24px; height: 20px; background-color:#CCCC99"></div>
		</div>
		<p>&nbsp;
			
		</p>
		<textarea
			style="position: absolute; left: 13px; top: 125px; width: 968px; height: 419px;"
			id="showresult"></textarea>

		<script type="text/javascript">
			 function $(id){
			 	return document.getElementById(id);
			 }
			 
			 function getData(){
			    $("status").className="tips-loading";
			    $("status").innerHTML="&nbsp;正在读取数据...";
			 	bean.sendPost(dwr.util.getValue("url"),function(data){
			 		$("showresult").value=data;
			 		$("status").className="tips-pass";
			 		$("status").innerHTML="&nbsp;&nbsp;读取完毕!";
			 	});
			 }
		</script>
	</body>
</html>


dwr.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd">

<dwr>
	<allow>
		<create creator="new" javascript="bean">
			<param name="class" value="com.cw.entity.Bean" />
			<include method="getCitys" />
			<include method="sendPost"/>
		</create>	 
	</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>org.directwebremoting.servlet.DwrServlet</servlet-class>-->
		<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
		<init-param>
			<param-name>debug</param-name>
			<param-value>false</param-value>
		</init-param>
		<init-param>
			<param-name>activeReverseAjaxEnabled</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>
				initApplicationScopeCreatorsAtStartup
			</param-name>
			<param-value>true</param-value>
		</init-param>
		<init-param>
			<param-name>maxWaitAfterWrite</param-name>
			<param-value>500</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.jsp</welcome-file>
	</welcome-file-list>
</web-app>
   发表时间:2008-05-07  
封装了下 java 通过url类获取远程数据的方法.

挺好.
0 请登录后投票
   发表时间:2008-05-07  
dwr真是给人带来丰富的想象力。佩服!
0 请登录后投票
   发表时间:2008-05-13  
function getData(){  
                $("status").className="tips-loading";  
                $("status").innerHTML=" 正在读取数据...";
                bean.sendPost(dwr.util.getValue("url"),function(data){
                    $("showresult").value=data;  

                });
                                bean.getCitys(function(data){
                   $("showresult").value=data;
                });
                $("status").className="tips-pass";  
                $("status").innerHTML="  读取完毕!";  
             }  



同时运行两个方法时 getCitys的结果为什么被覆盖?

0 请登录后投票
   发表时间:2008-05-13  
还有,你这样通过url从远程获取的东西,一般什么时候会用到啊?
如果是页面的话,你只需要连接下就可以了啦..
难道是个xml通过url从远程获取??
还是....
0 请登录后投票
   发表时间:2008-05-14  
这样获取远程的东西,其实现在很多公司都在用,
不过都是一些小公司。。。
如果你是做小说,股票,基金之类的网站,如果你公司没有足够的金钱和相关机构合作的话,是很难在最短时间内更新数据的。。。
当然,这也不能说你的网站也就这样挂掉,于是就这样去获取别人网站的东西,返回之后再解析之后就可以放到自己网站上去了,唉,以前没有少干过这样的事。。。
知道是违法的,那个后怕呀。。。
现在很多小说网站都是这样的,没有办法,要吃饭,只有去偷了。。。
0 请登录后投票
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