HttpURLConnection restfull post

下面是使用Java中的HttpURLConnection类构建RESTful API POST请求的简单示例：

URL url = new URL("https://jsonplaceholder.typicode.com/posts");

// Create connection object
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

// Set request method to POST
httpURLConnection.setRequestMethod("POST");

// Set headers
httpURLConnection.setRequestProperty("Content-Type", "application/json; utf-8");
httpURLConnection.setRequestProperty("Accept", "application/json");

// Enable output and set content length
httpURLConnection.setDoOutput(true);
String postData = "{\"title\": \"My Title\", \"body\": \"My Body\", \"userId\": 1}";
byte[] postDataBytes = postData.getBytes(StandardCharsets.UTF_8);
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));

// Write post data to output stream
try(OutputStream outputStream = httpURLConnection.getOutputStream()) {
    outputStream.write(postDataBytes, 0, postDataBytes.length);
}

// Get response code and response message
int responseCode = httpURLConnection.getResponseCode();
String responseMessage = httpURLConnection.getResponseMessage();

// Process response
if (responseCode == HttpURLConnection.HTTP_OK) {
    // Read response data
    BufferedReader in = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
    String responseData;
    StringBuilder responseBuilder = new StringBuilder();
    while ((responseData = in.readLine()) != null) {
        responseBuilder.append(responseData);
    }
    in.close();

    // Convert response to JSON object
    JSONObject jsonObject = new JSONObject(responseBuilder.toString());
    System.out.println(jsonObject.toString());
} else {
    System.out.println("POST request failed: " + responseMessage);
}

// Disconnect
httpURLConnection.disconnect();

在上面的代码中，我们使用HttpURLConnection类创建一个POST请求。我们将JSON对象作为POST数据传递，并将其写入输出流中。然后，我们读取响应并将其转换为JSON对象。

这是一个简单的例子，但你可以根据自己的需求定制它。记得在你的AndroidManifest.xml文件中添加Internet权限。