java 中，可以使用socket 发送POST请求，范例：

 
Socket s=new Socket("127.0.0.1",8083);
        PrintWriter pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
        String url="pass//FindServlet";
        pw.println("POST /"+url+" HTTP/1.1");
        pw.println("Host:localhost");
        pw.println("Accept-Language: zh-cn,zh;q=0.5");
        pw.println("Accept-Encoding: gzip,deflate");
        pw.println("Accept-Charset: gb2312,utf-8;q=0.7,*;q=0.7");
        pw.println("Connection: keep-alive");
        pw.println("Cookie: ASPSESSIONIDCSAATTCD=DOMMILABJOPANJPNNAKAMCPK");
        pw.println("Content-Type: application/x-www-form-urlencoded");
        pw.println("
Content-Length: 
9");
        pw.println();
        
        pw.println("title=MSN");
        pw.println();
        pw.flush();
        BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
        String content=FileUtils.getFullContent(br);
        System.out.println(content);
        FileUtils.writeToFile("./abc.html", content);
        br.close();
        pw.close();
        s.close();
 
注意：
Content-Length后面一定要有一个换行，
Content-Length指定的长度一定要与后面的参数一致。
最佳实践：
 
Socket s=new Socket("127.0.0.1",8083);
        PrintWriter pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
        String url="pass//FindServlet";
        pw.println("POST /"+url+" HTTP/1.1");
        pw.println("Host:localhost");
        pw.println("Content-Type: application/x-www-form-urlencoded");
        String params="title=MSN";
        int leng=params.length();
        pw.println("Content-Length: "+leng);
        
pw.println();//千万不能少
        pw.println(params);
        pw.println();
        pw.flush();
        BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
        String content=FileUtils.getFullContent(br);
        System.out.println(content);
        FileUtils.writeToFile("./abc.html", content);
        br.close();
        pw.close();
        s.close();
工具类：
  
 
     
     
          
  1. package com.http.util; 
    2.  
          
  2.  
    3.  
          
  3. import java.io.BufferedReader; 
    4.  
          
  4. import java.io.IOException; 
    5.  
          
  5. import java.io.InputStreamReader; 
    6.  
          
  6. import java.io.OutputStreamWriter; 
    7.  
          
  7. import java.io.PrintWriter; 
    8.  
          
  8. import java.net.Socket; 
    9.  
          
  9. import java.net.UnknownHostException; 
    10.  
          
  10.  
    11.  
          
  11. import com.http.bean.HttpRequestBean; 
    12.  
          
  12. import com.io.hw.util.FileUtils; 
    13.  
          
  13.  
    14.  
          
  14. public class HttpSocketUtil 
    15.  
          
  15. { 
    16.  
          
  16.     private static String httpPOSTSocket(String ip, String realm, int port, String url, String params) 
    17.  
          
  17.             throws UnknownHostException, IOException 
    18.  
          
  18.     { 
    19.  
          
  19.         Socket s = new Socket(ip, port); 
    20.  
          
  20.         PrintWriter pw = new PrintWriter(new OutputStreamWriter(s.getOutputStream())); 
    21.  
          
  21.         if (url.startsWith("/")) 
    22.  
          
  22.         { 
    23.  
          
  23.             url = url.substring(1); 
    24.  
          
  24.         } 
    25.  
          
  25.         int index2=url.indexOf("?"); 
    26.  
          
  26.         if(index2>0){ 
    27.  
          
  27.             url=url.substring(0, index2); 
    28.  
          
  28.         } 
    29.  
          
  29.         pw.println("POST /" + url + " HTTP/1.1"); 
    30.  
          
  30.         pw.println("Host:" + realm); 
    31.  
          
  31.         pw.println("Accept-Language: zh-cn,zh;q=0.5"); 
    32.  
          
  32.         pw.println("Accept-Encoding: gzip,deflate"); 
    33.  
          
  33.         pw.println("Accept-Charset: gb2312,utf-8;q=0.7,*;q=0.7"); 
    34.  
          
  34.         pw.println("Connection: keep-alive"); 
    35.  
          
  35.         pw.println("Cookie: ASPSESSIONIDCSAATTCD=DOMMILABJOPANJPNNAKAMCPK"); 
    36.  
          
  36.         pw.println("Content-Type: application/x-www-form-urlencoded"); 
    37.  
          
  37.         int leng = params.length(); 
    38.  
          
  38.         pw.println("Content-Length: " + leng); 
    39.  
          
  39.         pw.println(); 
    40.  
          
  40.         pw.println(params); 
    41.  
          
  41.         pw.println(); 
    42.  
          
  42.         pw.flush(); 
    43.  
          
  43.         BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream())); 
    44.  
          
  44.         String content = FileUtils.getFullContent(br); 
    45.  
          
  45.         br.close(); 
    46.  
          
  46.         pw.close(); 
    47.  
          
  47.         s.close(); 
    48.  
          
  48.         return content; 
    49.  
          
  49.     } 
    50.  
          
  50.  
    51.  
          
  51.     public static String httpSocket(HttpRequestBean httpBean) throws UnknownHostException, IOException 
    52.  
          
  52.     { 
    53.  
          
  53.         if (httpBean.isPOST()) 
    54.  
          
  54.         { 
    55.  
          
  55.             System.out.println("POST"); 
    56.  
          
  56.             return httpPOSTSocket(httpBean); 
    57.  
          
  57.         } 
    58.  
          
  58.         else 
    59.  
          
  59.         { 
    60.  
          
  60.             System.out.println("GET..."); 
    61.  
          
  61.             return httpGETSocket(httpBean); 
    62.  
          
  62.         } 
    63.  
          
  63.     } 
    64.  
          
  64.  
    65.  
          
  65.     private static String httpGETSocket(String ip, String realm, int port, String url) throws UnknownHostException, 
    66.  
          
  66.             IOException 
    67.  
          
  67.     { 
    68.  
          
  68.         Socket s = new Socket(ip, port); 
    69.  
          
  69.         PrintWriter pw = new PrintWriter(new OutputStreamWriter(s.getOutputStream())); 
    70.  
          
  70.         if (url.startsWith("/")) 
    71.  
          
  71.         { 
    72.  
          
  72.             url = url.substring(1); 
    73.  
          
  73.         } 
    74.  
          
  74.         pw.println("GET /" + url + " HTTP/1.1"); 
    75.  
          
  75.         pw.println("Host:" + realm); 
    76.  
          
  76.         pw.println("Accept-Language: zh-cn,zh;q=0.5"); 
    77.  
          
  77.         pw.println("Accept-Encoding: gzip,deflate"); 
    78.  
          
  78.         pw.println("Accept-Charset: gb2312,utf-8;q=0.7,*;q=0.7"); 
    79.  
          
  79.         pw.println("Connection: keep-alive"); 
    80.  
          
  80.         //        pw.println("Cookie: ASPSESSIONIDCSAATTCD=DOMMILABJOPANJPNNAKAMCPK"); 
    81.  
          
  81.         pw.println("Content-Type: text/http"); 
    82.  
          
  82.         pw.println(); 
    83.  
          
  83.         pw.flush(); 
    84.  
          
  84.         BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream())); 
    85.  
          
  85.         String content = FileUtils.getFullContent(br); 
    86.  
          
  86.         br.close(); 
    87.  
          
  87.         pw.close(); 
    88.  
          
  88.         s.close(); 
    89.  
          
  89.         return content; 
    90.  
          
  90.     } 
    91.  
          
  91.  
    92.  
          
  92.     private static String httpPOSTSocket(HttpRequestBean httpBean) throws UnknownHostException, IOException 
    93.  
          
  93.     { 
    94.  
          
  94.         return httpPOSTSocket(httpBean.getIp(), httpBean.getRealm(), httpBean.getPort(), httpBean.getUrl(), httpBean 
    95.  
          
  95.                 .getParams()); 
    96.  
          
  96.     } 
    97.  
          
  97.  
    98.  
          
  98.     private static String httpGETSocket(HttpRequestBean httpBean) throws UnknownHostException, IOException 
    99.  
          
  99.     { 
    100.  
          
  100.         return httpGETSocket(httpBean.getIp(), httpBean.getRealm(), httpBean.getPort(), httpBean.getUrl()); 
    101.  
          
  101.     } 
    102.  
          
  102.  
    103.  
          
  103.     public static void main(String[] args) 
    104.  
          
  104.     { 
    105.  
          
  105.         String content = null; 
    106.  
          
  106.         HttpRequestBean httpBean = new HttpRequestBean(); 
    107.  
          
  107.         String ip = "127.0.0.1"; 
    108.  
          
  108.         httpBean.setIp(ip); 
    109.  
          
  109.                 httpBean.setParams("title=MSN"); 
    110.  
          
  110.         httpBean.setPort(8083); 
    111.  
          
  111.         httpBean.setUrl("pass/FindServlet?title=MSN"); 
    112.  
          
  112.         httpBean.setPOST(true); 
    113.  
          
  113.         httpBean.setRealm(ip); 
    114.  
          
  114.         try 
    115.  
          
  115.         { 
    116.  
          
  116.             content = httpSocket(httpBean); 
    117.  
          
  117.         } 
    118.  
          
  118.         catch (UnknownHostException e) 
    119.  
          
  119.         { 
    120.  
          
  120.             e.printStackTrace(); 
    121.  
          
  121.         } 
    122.  
          
  122.         catch (IOException e) 
    123.  
          
  123.         { 
    124.  
          
  124.             e.printStackTrace(); 
    125.  
          
  125.         } 
    126.  
          
  126.         System.out.println(content); 
    127.  
          
  127.     } 
    128.  
          
  128. } 
    129.  
         
 
    
 
    
 
     ---------------------------------------------------------- 
    
 
    
 
     bean： 
     HttpRequestBean 
    
 
    
 
     
       package com.http.bean; 
     
 
     
         
     
 
     
       public class HttpRequestBean 
     
 
     
       { 
     
 
     
           private String ip; 
     
 
     
           private String realm; 
     
 
     
           private int port; 
     
 
     
           private String url; 
     
 
     
           private String params; 
     
 
     
           private boolean isPOST; 
     
 
     
 
      //getter 、setter方法略 
     
 
     
       } 
     
 
    
 
    
 
     -------------------------------------------------------------------------------------