当Java出现401未授权错误时，如何捕获POST请求的json响应？

URL url = new URL("http://example.com/api/resource");

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("POST");

connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestProperty("Authorization", "Bearer YOUR_ACCESS_TOKEN");

connection.setDoOutput(true);

try (OutputStream os = connection.getOutputStream()) {
    byte[] input = "{\"key\":\"value\"}".getBytes("utf-8");
    os.write(input, 0, input.length);
}

int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_UNAUTHORIZED) {
    // 捕获401错误
    try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getErrorStream(), "utf-8"))) {
        StringBuilder response = new StringBuilder();
        String responseLine = null;
        while ((responseLine = br.readLine()) != null) {
            response.append(responseLine.trim());
        }
        // 这里处理JSON响应
        System.out.println(response.toString());
    }
}

if (responseCode == HttpURLConnection.HTTP_OK) {
    try (BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"))) {
        StringBuilder response = new StringBuilder();
        String responseLine = null;
        while ((responseLine = br.readLine()) != null) {
            response.append(responseLine.trim());
        }
        // 这里处理JSON响应
        System.out.println(response.toString());
    }
}

connection.disconnect();

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost request = new HttpPost("http://example.com/api/resource");
request.setHeader("Content-Type", "application/json");
request.setHeader("Authorization", "Bearer YOUR_ACCESS_TOKEN");

StringEntity params = new StringEntity("{\"key\":\"value\"}", "UTF-8");
request.setEntity(params);

try (CloseableHttpResponse response = httpClient.execute(request)) {
    int statusCode = response.getStatusLine().getStatusCode();
    if (statusCode == HttpStatus.SC_UNAUTHORIZED) {
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            String result = EntityUtils.toString(entity);
            // 处理JSON响应
            System.out.println(result);
        }
    }
} catch (IOException e) {
    e.printStackTrace();
}

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

implementation 'org.apache.httpcomponents:httpclient:4.5.13'