如何用java發送Http的post請求，並傳遞參數

書寫方法，請參考以下代碼：

package utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;

public class TestClass {
    public static void main(String[] args) {
        OutputStreamWriter out = null ;
        BufferedReader in = null;  
        StringBuilder result = new StringBuilder(); 
        String url = "http://192.168.0.104:8088/songsController/selectTotalList";
        String sign = "11f5c83b448383cdb34330d5ddc88209";
        try {  
            URL realUrl = new URL(url);  
            // 打開和URL之間的連接  
            URLConnection conn = realUrl.openConnection();  
           //設置通用的請求頭屬性
            conn.setRequestProperty("accept", "*/*");  
            conn.setRequestProperty("connection", "Keep-Alive");  
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 發送POST請求必須設置如下兩行   否則會拋異常（java.net.ProtocolException: cannot write to a URLConnection if doOutput=false - call setDoOutput(true)）
            conn.setDoOutput(true);  
            conn.setDoInput(true); 
           //獲取URLConnection對象對應的輸出流並開始發送參數
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");  
            //添加參數
            out.write("&songid="+"10800537");
            out.flush();  
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));  
            String line;  
            while ((line = in.readLine()) != null) {  
                result.append(line);  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }finally {// 使用finally塊來關閉輸出流、輸入流  
            try {  
                if (out != null) {  
                    out.close();  
                }  
                if (in != null) {  
                    in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }  
       System.out.println(result.toString()); 
    }  

}