HTTPCONNCETION的getRequestProperty()问题

代码:
package untitled1;

import java.net.*;
import java.io.*;
import java.util.*;
public class Untitled2 {

/**
* @param args
*/
public static void main(String[] args) throws Exception {
// TODO 自存根

URL url = new URL("http://im.hiao./WAP/User_login.aspx?user=看海猪&password=8ad9902aecba32e2");
System.out.println("Host:"+url.getHost());
System.out.println("Path:"+url.getPath());
System.out.println("Port:"+url.getPort());
System.out.println("File:"+url.getFile());

URLConnection urlcon;

System.out.println("UrlContent TimeOut:"+urlcon.getConnectTimeout());
System.out.println("UrlContent LastModified:"+new Date(urlcon.getLastModified()));

String OutPutStream=new String();

System.out.println("==content==");
int i = urlcon.getContentLength();
if(i>0){
InputStream isr = urlcon.getInputStream();
InputStreamReader is=new InputStreamReader(isr, "GB2312");

int a; char b;
while((a = is.read())!=-1){

b=(char)a;
OutPutStream=""+OutPutStream +""+ String.valueOf(b)+"";

}

String e=urlcon.getRequestProperty("user");

System.out.println("user key is"+e);
System.out.println(urlcon.getURL());
System.out.println(OutPutStream);
is.close();
}else{
System.out.println("Length is null.");
}
}

}
我设置String e=urlcon.getRequestProperty("user");

System.out.println("user key is"+e);
且 http://im.hiao./WAP/User_login.aspx?user=看海猪&password=8ad9902aecba32e2
应该获"看海猪"?
返 NULL?