利用java的HttpURLConnection和Servlet通信

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 {            

//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 
url = new URL("http://localhost/projectname/servletname"); 

//打开，创建Connection对象
conn = (HttpURLConnection)url.openConnection(); 
//设定请求方式为POST
conn.setRequestMethod("POST");
//一定要设为true,因为要发送数据
conn.setDoOutput(true);
//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 { } }}