请求的第一行是“方法-URI-协议/版本”，其中GET就是请求方法，/servlet/default.jsp表示URI，HTTP/1.1是协议和协议的版本。根据HTTP标准，HTTP请求可以使用多种请求方法。例如，HTTP 1.1支持七种请求方法：GET，POST，HEAD，OPTIONS，PUT，DELETE，和TRACE。在Internet应用中，最常用的请求方法是GET和POST。
　　URI完整地指定了要访问的网络资源，通常认为它相对于服务器的根目录而言，因此总是以“/”开头。URL实际上是URI 一种类型。最后，协议版本声明了通信过程中使用的HTTP协议的版本。
　　请求头包含许多有关客户端环境和请求正文的有用信息。例如，请求头可以声明浏览器所用的语言，请求正文的长度，等等，它们之间用一个回车换行符号（CRLF）分隔。
　　请求头和请求正文之间是一个空行（只有CRLF符号的行），这个行非常重要，它表示请求头已经结束，接下来的是请求的正文。一些介绍Internet编程的书籍把这个CRLF视为HTTP请求的第四个组成部分。
　　在前面的HTTP请求中，请求的正文只有一行内容。当然，在实际应用中，HTTP请求正文可以包含更多的内容。
　　1.2 HTTP应答
　　和HTTP请求相似，HTTP应答也由三个部分构成，分别是：协议-状态代码-描述，应答头，应答正文。下面是一个HTTP应答的例子：
HTTP/1.1 200 OK
Date: Tue, 06 Mar 2012 12:32:58 GMT
Server: Apache/2.2.22 (Win32)
Last-Modified: Tue, 06 Mar 2012 11:46:06 GMT
ETag: “b000000008d9e-57-4ba9196947acd”
Accept-Ranges: bytes
Content-Length: 87
Content-Type: text/html

经过测试，可以使用滴
//实例一：
package com.abin.lii.han.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URLEncoder;

public class SocketGetServletTest {
 public static void main(String[] args) {
   BufferedWriter httpGetWriter = null;
         BufferedReader httpResponse = null;
         try {
             String hostname = "localhost";// 主机，可以是域名，也可以是ip地址
             int port = 1443;// 端口
             InetAddress addr = InetAddress.getByName(hostname);
             // 建立连接
             Socket socket = new Socket(addr, port);
             // 创建数据提交数据流
             httpGetWriter = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "GBK"));
             // 相对主机的请求地址
             StringBuffer httpSubmitPath = new StringBuffer("/abin/ImediaRegister?");
//             StringBuffer httpSubmitPath = new StringBuffer("http://localhost:7200/abin/ImediaRegister?");
             httpSubmitPath.append(URLEncoder.encode("app", "GBK"));
             httpSubmitPath.append("=");
             httpSubmitPath.append(URLEncoder.encode("longcodeimedia", "GBK"));
             httpSubmitPath.append("&");
             httpSubmitPath.append(URLEncoder.encode("udid", "GBK"));
             httpSubmitPath.append("=");
             httpSubmitPath.append(URLEncoder.encode("123456789", "GBK"));
             httpSubmitPath.append("&");
             httpSubmitPath.append(URLEncoder.encode("source", "GBK"));
             httpSubmitPath.append("=");
             httpSubmitPath.append(URLEncoder.encode("limei", "GBK"));
             httpSubmitPath.append("&");
             httpSubmitPath.append(URLEncoder.encode("returnFormat", "GBK"));
             httpSubmitPath.append("=");
             httpSubmitPath.append(URLEncoder.encode("2", "GBK"));
             httpGetWriter.write("GET " + httpSubmitPath.toString() + " HTTP/1.1\r\n");
             httpGetWriter.write("Host: localhost:7200\r\n");
             httpGetWriter.write("UserAgent: IE8.0\r\n");
             httpGetWriter.write("Connection: Keep-Alive\r\n");
             httpGetWriter.write("\r\n");
             httpGetWriter.flush();
             // 创建web服务器响应的数据流
             httpResponse = new BufferedReader(new InputStreamReader(socket.getInputStream(), "GBK"));
             // 读取每一行的数据.注意大部分端口操作都需要交互数据。
             String lineStr = "";
             while ((lineStr = httpResponse.readLine()) != null) {
                 System.out.println(lineStr);
             }
         } catch (Exception e) {
             e.printStackTrace();
         } finally {
             try {
                 if (httpGetWriter != null) {
                     httpGetWriter.close();
                 }
                 if (httpResponse != null) {
                     httpResponse.close();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }

       
}



//实例二

package com.abin.lii.han.socket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.Socket;

public class SocketGetServletTest1 {

 public static void main(String[] args) {
  try {
   Socket socket = new Socket(InetAddress.getLocalHost(), 7200);
   BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
   StringBuffer buffer = new StringBuffer();
   buffer.append("GET http://localhost:7200/abin/ImediaRegister?app=2 HTTP/1.1\r\n");
   buffer.append("Host: localhost:7200\r\n");
   buffer.append("UserAgent: IE8.0\r\n");
   buffer.append("Connection: Keep-Alive\r\n");
   // 注，这是关键的关键，忘了这里让我搞了半个小时。这里一定要一个回车换行，表示消息头完，不然服务器会等待
   buffer.append("\r\n");
   writer.write(buffer.toString());
   writer.flush();

   // --输出服务器传回的消息的头信息
   BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
   String line = null;
   StringBuilder builder=new StringBuilder();
   while((line=reader.readLine())!=null){
    builder.append(line);
   }
   String result=builder.toString();
   System.out.println("result="+result);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}