public static void appadd() {
try {
URL url = new URL(ADD_URL);
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod(“POST”);
connection.setUseCaches(false);
connection.setInstanceFollowRedirects(true);
connection.setRequestProperty(“connection”, “Keep-Alive”);

//connection.setRequestProperty(“Content-Type”, “text/plain; charset=utf-8”);
connection.connect();
//POST請求
DataOutputStream out = new DataOutputStream(
connection.getOutputStream());
JSONObject obj = new JSONObject();
String message = java.net.URLEncoder.encode(“哈哈哈”,“utf-8”);
obj.element(“username”, “bwgf8”);
obj.element(“password”, “a1234561”);

            out.writeBytes("data="+obj.toString());
            System.out.println("data="+obj.toString());
            out.flush();
            out.close();
            //讀取響應
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String lines;
            StringBuffer sb = new StringBuffer("");
            while ((lines = reader.readLine()) != null) {
                lines = new String(lines.getBytes(), "utf-8");
                sb.append(lines);
            }
            System.out.println(sb);
            reader.close();
            connection.disconnect();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    public static String sendPost(String url, String param,String charset) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        String line;
        StringBuffer sb=new StringBuffer();
        try {
            URL realUrl = new URL(url);
            // 開啟和URL之間的連線 
            URLConnection conn = realUrl.openConnection();
            // 設定通用的請求屬性 設定請求格式
            conn.setRequestProperty("contentType", charset);  
            conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
            //設定超時時間
            conn.setConnectTimeout(60);
            conn.setReadTimeout(60);
            // 傳送POST請求必須設定如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection物件對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 傳送請求引數
            out.print(param);
            // flush輸出流的緩衝
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應    設定接收格式
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(),charset));
            while ((line = in.readLine()) != null) {
                sb.append(line);
            }
            result=sb.toString();
        } catch (Exception e) {
            System.out.println("傳送 POST請求出現異常!"+e);
            e.printStackTrace();
        }
        //使用finally塊來關閉輸出流、輸入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }  

    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 開啟和URL之間的連線
            URLConnection conn = realUrl.openConnection();
            // 設定通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 傳送POST請求必須設定如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection物件對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 傳送請求引數
            out.print(param);
            // flush輸出流的緩衝
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("傳送 POST 請求出現異常！"+e);
            e.printStackTrace();
        }
        //使用finally塊來關閉輸出流、輸入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    

    public static void main(String[] args) {
    	
    		String sr=HttpRequest.sendPost("http://u.house.ifeng.com/user/login/validate?", "mobile=13133814608&pwd=933032shixinfa");
    	//String sr2=HttpRequest.sendPost("https://www.baiwang.com/login/service/userRoute", "username=bwgf8&password=a123456");
        System.out.println(sr);
       // appadd();
    }

}