how to read body of a post packet in java

This question already has an answer here:

Read/convert an InputStream to a String 56 answers

---

if you use Java 8 you can do

List<String> content = BR.lines().collect(Collectors.toList());

Otherwise you can do

List<String> content = new ArrayList<>();
String line;
while((line = BR.readLine()) != null) {
   content.add(line);
}

Then parse/format as you wish to get the response as a whole.

---

BR.readLine() only returns the first line; you need to loop through the BufferedReader to read all lines. One possible way would be:

String fullMessage;
String aux;
do{
    aux = BR.readLine();
    fullMessage = fullMessage.concat(aux);
}while(aux != null);

This is just an example to illustrate the idea.

Read the documentation: https://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#readLine()

Example for java 7+

    String message = null;
    //Try with resources, java will handle the closing of the stream, event if exception is thrown.
    try (   InputStreamReader inputStream = new InputStreamReader(socket.getInputStream());
            BufferedReader bufferReader = new BufferedReader(inputStream);) {

        String aux = null;
        do {
            aux = bufferReader.readLine();
            message = message.concat(aux);
        } while (aux != null);

    } catch (IOException e) {
        System.out.println("Failed to read input stream from socket");
    }

    System.out.println("Message: " + message);

For older versions of java you can use:

    InputStreamReader inputStream = null;
    BufferedReader bufferReader = null;
    String message = null;
    try {
        inputStream = new InputStreamReader(socket.getInputStream());
        bufferReader = new BufferedReader(inputStream);
        String aux = null;
        do {
            aux = bufferReader.readLine();
            message = message.concat(aux);
        } while (aux != null);

        inputStream.close();
        bufferReader.close();
    } catch (IOException e) {
        //Read throws IOException, don't just use Exception (this could hide other exceptions that you are not treating).
        System.out.println("Failed to read input stream from socket");
    } finally{
        //Use 2 try-catch, if you only use one and the first fails, the second will never close.
        try{inputStream.close();}catch(IOException ioe){}
        try{bufferReader.close();}catch(IOException ioe){}
    } 


     System.out.println("Message: "+message);

EDIT: Sorry append is for StringBuffer and StringBuilder, my bad sorry.

EDIT2: Added 2 example with more information.

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