结合DWR获取远程URL数据
bean.javapackage 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><divstyle="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><labelstyle="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> </p><textareastyle="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=" 正在读取数据..."; bean.sendPost(dwr.util.getValue("url"),function(data){ $("showresult").value=data; $("status").className="tips-pass"; $("status").innerHTML=" 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>bean.sendPost(dwr.util.getValue("url"),function(data){