httpclient.java

来自「JavaExplorer是一个独立于平台的浏览器」· Java 代码 · 共 88 行

/*
 * Created on 1 mars 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package javaexplorer.http;

/**
 * @author veeb7280
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
import java.net.*;
import java.io.*;

import javaexplorer.util.Log;
import javaexplorer.util.options.*;

public class HttpClient {

	

	/**
	 * M閠hode utilis閑 pour r閏up閞er des flux partiels de donn閑s
	 * en utilisant HTTP 1.1 (non dispo en java)
	 * @param url
	 * @throws IOException
	 */
	
	public static InputStream getInputStream(URL url, long restart){
		try{
			InputStream input =  null;
			Socket socket = null;
			String authent_proxy = "";
			if( isUseProxy(url) ){
				socket = new Socket(HttpOptions.getOptions().getProxyHost(),HttpOptions.getOptions().getProxyPort());
			}
			else{
				socket = new Socket(url.getHost(), (url.getPort()== -1 ? url.getDefaultPort():url.getPort()));
			}
			BufferedWriter out = new BufferedWriter(new 
					OutputStreamWriter(socket.getOutputStream()));
			input = socket.getInputStream();
			BufferedReader in = new BufferedReader(new InputStreamReader(input));
			//Ecriture de la commande de r閏up en partial
			sendPartialGet(out, url, restart);
			//Lecture la r閜onse
			int code = readResponse(in);
			switch(code){
				case 206:
					return input;
				case 407:
					//On retente l'envoi
					sendPartialGet(out, url, restart);
					int code2 = readResponse(in);
					if(code2 == 206) return input;
				default :
					socket.close();
					return null;									
			}
		}catch( Exception e){
			javaexplorer.util.Log.addError(e);
			return null;
		}
	}		
	
	public static void sendPartialGet(BufferedWriter out, URL url, long restart) throws IOException{
		StringBuffer sb = new StringBuffer();
		sb.append("GET ").append(url.getFile()).append(" HTTP/1.1\n");
		sb.append("Host: " + url.getHost()+"\n");
		sb.append("Range: bytes=").append(restart).append("-\n");
		if( HttpOptions.getOptions().isUseProxy()){
			sb.append(getBasicProxyAuth()).append("\n");
		}
		//Fin de flux
		sb.append("\n");

		Log.addDebug("Requete :\n" + sb.toString());
		out.write(sb.toString());
		Log.addDebug("requete envoyee");
		out.flush();		
	}
	
	/**
	 * Envoi d'une requete sur le flux
	 * On lit la r閜onse et on retourne le code retourn