如何用java發送Http的post請求，並傳遞參數

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());
}

}