How to send Request payload to REST API in java?

问题:

I want to retrieve the JSON data from the following: https://git.eclipse.org/r/#/c/11376/

Request URL: https://git.eclipse.org/r/gerrit/rpc/ChangeDetailService

Request Method: POST

Request Headers:

Accept:application/json  Content-Type:application/json; charset=UTF-8 

Request Payload:

{"jsonrpc":"2.0","method":"changeDetail","params":[{"id":11376}],"id":1} 

I already tried this answer but I am getting 400 BAD REQUEST.

Can anyone help me sort this out?

Thanks.

回答1:

The following code works for me.

//escape the double quotes in json string String payload="{\"jsonrpc\":\"2.0\",\"method\":\"changeDetail\",\"params\":[{\"id\":11376}],\"id\":2}"; String requestUrl="https://git.eclipse.org/r/gerrit/rpc/ChangeDetailService"; sendPostRequest(requestUrl, payload); 

method implementation:

public static String sendPostRequest(String requestUrl, String payload) {     try {         URL url = new URL(requestUrl);         HttpURLConnection connection = (HttpURLConnection) url.openConnection();          connection.setDoInput(true);         connection.setDoOutput(true);         connection.setRequestMethod("POST");         connection.setRequestProperty("Accept", "application/json");         connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");         OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");         writer.write(payload);         writer.close();         BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));         StringBuffer jsonString = new StringBuffer();         String line;         while ((line = br.readLine()) != null) {                 jsonString.append(line);         }         br.close();         connection.disconnect();     } catch (Exception e) {             throw new RuntimeException(e.getMessage());     }     return jsonString.toString(); } 

回答2:

I tried with a rest client.

Headers :

• POST /r/gerrit/rpc/ChangeDetailService HTTP/1.1
• Host: git.eclipse.org
• User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0
• Accept: application/json
• Accept-Language: null
• Accept-Encoding: gzip,deflate,sdch
• accept-charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
• Content-Type: application/json; charset=UTF-8
• Content-Length: 73
• Connection: keep-alive

it works fine. I retrieve 200 OK with a good body.

Why do you set a status code in your request? and multiple declaration "Accept" with Accept:application/json,application/json,application/jsonrequest. just a statement is enough.

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