webclient.java

是一款国外的网络游戏平台的源码*不是类似浩方那种虚拟局域网技术

/*
 * Created on Jul 31, 2006
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package org.GTADS.helper;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import javax.swing.text.JTextComponent;

/**
 * @author sday
 *
 * Class for general purpose web functions
 * intially used for www.whatismyip.com web request
 * 
 */
public class WebClient {
	
	public static String getWhatIsMyIP(JTextComponent statusObject){
		String externalIPAddress = "";
		String buffer = new String();
		boolean EOF = false;
		setStatusOnTextObject(statusObject, "Retrieveing IP...");
		try {
			URL  whatIsMyIPDotCom = new URL ("http://www.whatismyip.com");
			whatIsMyIPDotCom.openConnection();
			InputStream webData = whatIsMyIPDotCom.openStream();
			DataInputStream din = new DataInputStream(webData);
			
			while (true){
				String s = new String();
				s = din.readLine();
				if (s == null)
					break;
				else
					buffer += s;
			}
			
			externalIPAddress = parseURLFromMyIPSite(buffer);
			
		} catch (IOException ioe){
			externalIPAddress = "Error getting IP Address";
			
		}
		return externalIPAddress;
	}
	
	public static String webGet(String urlRequest){
		String content = new String();
		StringBuffer contentStream = new StringBuffer();
		try {
			URL genericURLRequest = new URL (urlRequest);
			genericURLRequest.openConnection();
			InputStream webData = genericURLRequest.openStream();
			DataInputStream din = new DataInputStream(webData);
			
			while (true){
				String s = new String();
				s = din.readLine();
				if (s == null)
					break;
				else
					contentStream.append(s);
			}
			
		} catch (Exception e){
			return null;
		}
		
		return new String(contentStream);
	}
	
	private static String parseURLFromMyIPSite(String webUserData){
		String getIP = new String("");
		String searchString1 = "<TITLE>WhatIsMyIP.com - ";
		String searchString2 = "</TITLE>";

		int startPos = searchString(webUserData, searchString1);
		int endPos = searchString(webUserData, searchString2);
		
		if (startPos != -1 && endPos != -1 &&
				endPos > startPos){
			getIP = webUserData.substring(startPos, endPos - searchString2.length());
		}
		return getIP;
	}
	
	private static int searchString(String text, String searchString){
		int pos = -1;
		int searchPos = 0;
		for (int i = 0; i <= text.length(); i++){
			if (searchPos >= searchString.length()){
				pos = i;
				break;
			}
			if (text.charAt(i) == searchString.charAt(searchPos)){
				searchPos++;
			}
			else {
				searchPos = 0;
			}
		}
			
		return pos;
	}
	
	private static void setStatusOnTextObject(JTextComponent statusObject, String newText){
		if (statusObject != null){
			statusObject.setText(newText);
		}
	}

	public static void main(String[] args) {
		System.out.print(getWhatIsMyIP(null));
	}
}