利用java的HttpURLConnection和Servlet通信,Post方式

       这几天测试Servlet通信，写了一个小程序，通过从Properties文件中读取设定信息，构造Http头，向Servlet发Post请求，并且接收Servlet的结果，下面给出程序的大概结构：

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

public class testPost {
    public static void main() {
        URL url = null;
        HttpURLConnection conn = null;
        
        try {
            url = new URL("http://localhost/projectname/servletname");      //构造好这个URL对象，参数就是你要通信的servlet地址，实际测试的时候，这个URL可以从Properties文件中取得，以增加灵活性
            conn = (HttpURLConnection)url.openConnection();                 //打开，创建Connection对象

            conn.setRequestMethod("POST");                                         //设定请求方式为POST
            conn.setDoOutput(true);                                                        //一定要设为true,因为要发送数据

            //下面开始设定Http头
           conn.setRequestProperty("Content-Type","multipart/form-data; boundary=Bounday---");
           conn.setRequestProperty("Cache-Control","no-cache");
           .......

         //  传送送据
          OutputStream buf = conn.getOutoutStream();
          buf = new BufferedOutputStream(buf);

          OutputStreamWriter out = new  OutputStreamWriter (buf);
          out.write("这里是要传送的数据")；
          //比方说如下的格式,当然这是自己规定的格式，这些都可以从配置文件中设定，然后读取
          //Bounday---
          //Content-Disposition: form-data; name="testRequestHeader"
          //  Data = aabbccddeeffgghh
          //--Bounday---
          out.flush();                                                    //这个一定要
          out.clost();

        //接收数据
        InputStream in = conn.getInputStream();
        in = new BufferedOutputStream(buf);
        Reader rData = new InputStreamReader(in);

        int c;
        
        System.out.println("=====================Result==========================");
        while((c=rData.read()) != -1)
               System.out.print((char)c);
        System.out.println("===================================================");
        
        in.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        }
    }
}