If you have a problem sending JSON via Httppost in Java, please help

Question

I am working on a school project that requires JAVA to send a series of barcodes to the php web service interface. I looked at a couple of posts here and here , and took something from them, but my code doesn't seem to work.

So here is my JAVA code:

import org.json.simple.JSONObject;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.apache.http.entity.StringEntity;
import org.apache.http.HttpResponse;
import java.io.InputStream;


public class jsontest2 {
    public static void main (String Args[]) {
        JSONObject obj=new JSONObject();
        JSONObject codes=new JSONObject();
        //Forms the name value pairs for the barcodes and quantity
        codes.put("598013", new Integer(10));
        codes.put("5849632927",new Integer(15));
        codes.put ("5849676037",new Integer(20));
        codes.put ("6634391931", new Integer(25));

        //Headers in the JSON array
        obj.put("LoginID", new Integer(1234));
        obj.put("Machine_ID", new Integer(123456789));
        obj.put("add", codes);
        System.out.print(obj);

        //httppost
        try {
            HttpClient httpclient= new DefaultHttpClient();
            HttpResponse response;
            HttpPost httppost= new HttpPost ("http://example/receive.php");
            StringEntity se=new StringEntity ("myjson: "+obj.toString());
            httppost.setEntity(se);
            System.out.print(se);
            httppost.setHeader("Accept", "application/json");
            httppost.setHeader("Content-type", "application/json");

            response=httpclient.execute(httppost);

        }
        catch (Exception e) {
            e.printStackTrace();
            System.out.print("Cannot establish connection!");
        }
    }
}

And to test the httppost request, I made this php file to register each request.

<?php
$input = stripslashes($_POST["myjson"]);
logToFile("post.txt", $input);

function logToFile($filename, $msg)
{
    $fd = fopen($filename, "a");
    $str ="[".date("Y/m/d h:i:s")."]".$msg;
    fwrite($fd, $str."\n");
    fclose($fd);
}

The problem is the log file log.txt every time the JAVA program starts, it adds only a new line consisting of time and date. For me, this means that php chooses that there is an httppost request, but where is my json line?

Can someone tell me what I am doing wrong? I've been stuck here for a while. Thank!

Answer 1

, HTTP-, PHP- . PHP :

<?php
$input = file_get_contents('php://input');
logToFile("post.txt",$input);

function logToFile($filename,$msg)
{
      $fd=fopen($filename,"a");
      $str="[".date("Y/m/d h:i:s")."]".$msg;
      fwrite($fd,$str."\n");
      fclose($fd);
}
?>

. :

php curl post json

Answer 2

php-

            $username="demo";
    $action = 'error';
    $json   =array('action'=> $action, 'username' => $username );
    echo json_encode($json);

java

String regstatus = "";

  BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));    

     String line;
     while ((line = rd.readLine()) != null) {

       regstatus =line;
       String json="["+regstatus+"]" ;
       JsonArray jArray = new JsonParser().parse(json).getAsJsonArray();
       for (int i=0;i<jArray.size();i++) {
           JsonObject jsonObject = jArray.get(i).getAsJsonObject();
           System.out.println(jsonObject.get("username"));
           System.out.println(jsonObject.get("action"));
           System.out.println("*********");
       }


     }

'[' JSON java