用Socket发送http请求

import java.net.*;
import java.io.*;
public class URLSender { 
  /**     * @param args */
public static void main(String[] args) throws IOException {
        try {
           Socket socket = new Socket("www.nwu.edu.cn", 80);
           boolean autoflush = true;
           PrintWriter out = new PrintWriter(socket.getOutputStream(), autoflush);
           BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            //send an HTTP request to the web server
           out.println("GET / HTTP/1.1");
           out.println("Host: nwu.edu.cn");
           out.println("Connection: Close");
           out.println();
           //read the response       
           boolean loop = true;
           StringBuffer sb = new StringBuffer(8096);
           while (loop) {
              if (in.ready()) {
                int i = 0;
                while (i != -1) {
                    i = in.read();
                    sb.append((char) i);
                }
                loop = false;
            }
           //Thread.currentThread().sleep(50); 
          } 
          //display the response to the out console 
          System.out.println(sb.toString());
          socket.close();
       } catch (UnknownHostException e) {
            System.err.println("Don't know about host: Victest.");
            System.exit(1);
       } catch (IOException e) {
           System.err.println("Couldn't get I/O for " + "the connection to: Victest."); 
           System.exit(1);
       }
  }
}

2、用Socket发送一个POST请求

    try {
        // Construct data
        String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
        data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");
   
        // Create a socket to the host
        String hostname = "hostname.com";
        int port = 80;
        InetAddress addr = InetAddress.getByName(hostname);
        Socket socket = new Socket(addr, port);
   
        // Send header
        String path = "/servlet/SomeServlet";
        BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8"));
        wr.write("POST "+path+" HTTP/1.0\r\n");
        wr.write("Content-Length: "+data.length()+"\r\n");
        wr.write("Content-Type: application/x-www-form-urlencoded\r\n");
        wr.write("\r\n");
   
        // Send data
        wr.write(data);
        wr.flush();
   
        // Get response
        BufferedReader rd = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String line;
        while ((line = rd.readLine()) != null) {
            // Process line...
        }
        wr.close();
        rd.close();
    } catch (Exception e) {
    }