2012-04-22 152 views
0

我正在尝试使用套接字进行HTTPClient连接,但无法弄清楚。当我运行代码时,我收到以下消息;Java中的HTTP客户端连接

HTTP/1.1 400 Bad Request 
Date: Sun, 22 Apr 2012 13:17:12 GMT 
Server: Apache/2.2.16 (Debian) 
Vary: Accept-Encoding 
Content-Length: 317 
Connection: close 
Content-Type: text/html; charset=iso-8859-1 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> 
<html><head> 
<title>400 Bad Request</title> 
</head><body> 
<h1>Bad Request</h1> 
<p>Your browser sent a request that this server could not understand.<br /> 
</p> 
<hr> 
<address>Apache/2.2.16 (Debian) Server at pvs.ifi.uni-heidelberg.de Port 80</address> 
</body></html> 

的代码是在这里:

import java.net.*; 
import java.io.*; 

public class a1 { 
    public static void main (String[] args) throws IOException { 
    Socket s = null; 

    try { 
     String host = "host1"; 
     String file = "file1"; 
     int port = 80; 

在这里,我创建套接字:

  s = new Socket(host, port); 

     OutputStream out = s.getOutputStream(); 
     PrintWriter outw = new PrintWriter(out, false); 
     outw.print("GET " + file + " HTTP/1.1\r\n"); 
     outw.print("Accept: text/plain, text/html, text/*\r\n"); 
     outw.print("\r\n"); 
     outw.flush();   

     InputStream in = s.getInputStream(); 
     InputStreamReader inr = new InputStreamReader(in); 
     BufferedReader br = new BufferedReader(inr); 
     String line; 

     while ((line = br.readLine()) != null) { 
       System.out.println(line); 
     } 

    } 
    catch (UnknownHostException e) {} 
    catch (IOException e) {} 

     if (s != null) { 
       try { 
         s.close(); 
       } 
       catch (IOException ioEx) {} 
     } 
    } 
} 

任何帮助将不胜感激。谢谢。

+0

试试这个:http://stackoverflow.com/questions/1359689/how-to-send-http-request-in-java/1359700#1359700 – duffymo 2012-04-22 13:26:04

+4

或者你可以使用Apache Commons http。 – bmargulies 2012-04-22 13:26:41

+0

如果你真的想编写自己的HTTP客户端(如果这不仅仅是为了好玩,那么不要看上面的注释),你应该首先尝试HTTP 1.0并在请求的路径之前添加一个斜杠:' “GET /”+文件+“HTTP/1.0 \ r \ n”'。 – 2012-04-22 13:32:23

回答

4

如果你真的想编写自己的HTTP客户端(难度比它看起来,但很教育性),你缺少的HTTP 1.1的要求Host头:

outw.print("Host: " + host + ":" + port + "\r\n"); 

RFC 2616, section 14.23. Host

客户端必须在所有HTTP/1.1请求消息中包含一个主机头字段。

所以你的要求不好,它错过要求Host头。