JAVA HTTP POST请求(请求参数格式为json)

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public static String JsonSMS(String postData, String postUrl) {    try {        //发送POST请求        URL url = new URL(postUrl);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setRequestMethod("POST");        conn.setRequestProperty("Content-Type", "application/json");        conn.setRequestProperty("Connection", "Keep-Alive");        conn.setUseCaches(false);        conn.setDoOutput(true);        conn.setRequestProperty("Content-Length", "" + postData.length());        OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");        out.write(postData);        out.flush();        out.close();        //获取响应状态        if (conn.getResponseCode() != HttpURLConnection.HTTP_OK) {            System.out.println("connect failed!");            return "";        }        //获取响应内容体        String line, result = "";        BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));        while ((line = in.readLine()) != null) {            result += line + "\n";        }        in.close();        return result;    } catch (IOException e) {        e.printStackTrace(System.out);    }    return "";}

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