HTTP POST using JSON in Java

要在 java 裡接收 post 收到的 json,範例如下:

 Read the Response From Input Stream

Get the input stream to read the response content. Remember to use try-with-resources to close the response stream automatically.

Read through the whole response content, and print the final response string:

try(BufferedReader br = new BufferedReader(
  new InputStreamReader(con.getInputStream(), "utf-8"))) {
    StringBuilder response = new StringBuilder();
    String responseLine = null;
    while ((responseLine = br.readLine()) != null) {
        response.append(responseLine.trim());
    }
    System.out.println(response.toString());
}

如果是要透過 java 送出,範例如下:

Here is what you need to do:

  1. Get the Apache HttpClient, this would enable you to make the required request
  2. Create an HttpPost request with it and add the header application/x-www-form-urlencoded
  3. Create a StringEntity that you will pass JSON to it
  4. Execute the call

The code roughly looks like (you will still need to debug it and make it work):

// @Deprecated HttpClient httpClient = new DefaultHttpClient();
HttpClient httpClient = HttpClientBuilder.create().build();
try {
    HttpPost request = new HttpPost("http://yoururl");
    StringEntity params = new StringEntity("details={\"name\":\"xyz\",\"age\":\"20\"} ");
    request.addHeader("content-type", "application/x-www-form-urlencoded");
    request.setEntity(params);
    HttpResponse response = httpClient.execute(request);
} catch (Exception ex) {
} finally {
    // @Deprecated httpClient.getConnectionManager().shutdown(); 
}

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