Http Post请求 带Header和Body

public static String sendSMS(String account){
		String jsonBody =getSmsContent(account);
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL smsUrl = new URL(SMS_API_URL);
			URLConnection conn = smsUrl.openConnection();
			 // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty(KEY_APPLICATION_ID, VALUE_APPLICATION_ID);
            conn.setRequestProperty(KEY_RESET_KEY, VALUE_RESET_KEY);
            conn.setRequestProperty(KEY_CONTENT_TYPE, VALUE_CONTENT_TYPE);
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            
            out = new PrintWriter(conn.getOutputStream());
            // flush输出流的缓冲
            out.write(jsonBody);
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		 //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
	}