Java完成网关Digest认证登录后，如何正确发送JSON数据？

Hey there! Let's sort out that JSON sending problem you're facing. The issue with your current approach is two-fold: first, HttpGet isn't meant to carry a request body (that's what POST requests are for), and second, the way you're trying to attach the JSON uses deprecated/incorrect methods. Plus, your jsonSicuro string has a syntax error—let's fix all of that together.

Step 1: Switch to HttpPost for sending payloads #

GET requests don't support request bodies in standard practice, so we'll use HttpPost instead of HttpGet to send your JSON data.

Step 2: Fix the JSON syntax #

Your original JSON has a typo: it starts with ["txmsgid": (array syntax) but it's an object—should be {"txmsgid": ...}. Also, txmsgid is missing a value. Let's correct that first:

private static String jsonSicuro = "{\"txmsgid\": \"sample-tx-id\", \"trycount\": 5, \"port\": 2, \"payload\": \"01\", \"ack\": true, \"mote\": \"17A7F79\"}";

Step 3: Attach the JSON payload correctly #

We'll create a StringEntity with your JSON, set the correct Content-Type header to application/json, and attach it to the HttpPost request.

Full Modified Code #

Here's the updated version of your code with all fixes applied:

private static final String SPN_IP = "192.168.0.2";
private static final String SPN_LOGIN = "myadmin";
private static final String SPN_PASSWORD = "mypasswor";
// Fixed JSON syntax (object instead of array, added txmsgid value)
private static String jsonSicuro = "{\"txmsgid\": \"sample-tx-id\", \"trycount\": 5, \"port\": 2, \"payload\": \"01\", \"ack\": true, \"mote\": \"17A7F79\"}";

public static void main(String[] args) throws IOException, KeyStoreException, NoSuchAlgorithmException, KeyManagementException, AuthenticationException, URISyntaxException {
    // SSL management (unchanged, works fine)
    SSLContextBuilder builder = new SSLContextBuilder();
    builder.loadTrustMaterial(null, new TrustSelfSignedStrategy()); // trust self-signed cert
    SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(builder.build(), new HostnameVerifier() {
        @Override
        public boolean verify(String hostname, SSLSession sslSession) {
            return SPN_IP.equals(hostname); // validate the host name
        }
    });

    // Create client (unchanged)
    CloseableHttpClient httpclient = HttpClientBuilder.create()
            .setSSLSocketFactory(sslSocketFactory)
            .build();

    // --- Changed from HttpGet to HttpPost ---
    HttpPost httpPost = new HttpPost("https://" + SPN_IP);

    // HTTP digest auth (unchanged, this part works)
    DigestScheme digestAuth = new DigestScheme();
    digestAuth.overrideParamter("algorithm", "MD5");
    digestAuth.overrideParamter("realm", "https://" + SPN_IP);
    digestAuth.overrideParamter("nonce", Long.toString(new Random().nextLong(), 36));
    digestAuth.overrideParamter("qop", "auth");
    digestAuth.overrideParamter("nc", "0");
    digestAuth.overrideParamter("cnonce", DigestScheme.createCnonce());

    // Send HTTP digest header (unchanged)
    Header auth = digestAuth.authenticate(new UsernamePasswordCredentials(SPN_LOGIN, SPN_PASSWORD), httpPost, null);
    System.out.println(auth.getName());
    System.out.println(auth.getValue());
    httpPost.setHeader(auth);

    // --- Add JSON payload ---
    // Create StringEntity with JSON, set correct content type
    StringEntity entity = new StringEntity(jsonSicuro, ContentType.APPLICATION_JSON);
    httpPost.setEntity(entity);

    ResponseHandler<String> responseHandler = new BasicResponseHandler();
    System.out.println("Executing request: " + httpPost.getRequestLine());
    String response = httpclient.execute(httpPost, responseHandler);
    System.out.println("Response: " + response);
}

Key Notes: #

• Why HttpPost?: By HTTP standards, GET requests are for retrieving data, while POST is for sending data to the server (like your JSON payload). Most servers won't parse a request body from a GET request.
• Content-Type Header: Setting ContentType.APPLICATION_JSON tells the gateway that you're sending JSON data, so it knows how to parse the payload correctly.
• JSON Syntax: Always double-check your JSON—invalid syntax will cause the gateway to reject the request even if everything else is correct.

内容的提问来源于stack exchange，提问作者Nicola Carlucci