SocketRequestResponse.java - Socket Client Testing Program

This section provides a tutorial example on how to write a Java program using socket interface to send a request and receive a response in binary mode.

Since most Web services are based on the TCP socket communication, it is very important to have a socket level client testing program ready to troubleshoot your Web service applications.

So I wrote this simple socket program, SocketRequestResponse.java, that can be used to send a request message and receive the response message to a remote TCP based server.

/* SocketRequestResponse.java
 * Copyright (c) 2009 by Dr. Herong Yang, herongyang.com
 * All rights reserved
 */
import java.io.*;
import java.net.*;
public class SocketRequestResponse {
   public static void main(String[] args) {
      PrintStream out = System.out;   	

// Checking command line arguments
      if (args.length < 4) {
         out.println("Usage:");
         out.println(
            "java SocketRequestResponse host port in_file out_file");
         return;
      }
      String host = args[0];
      int port = (Integer.valueOf(args[1])).intValue();
      String inFile = args[2];
      String outFile = args[3];

      try {
// Reading the request file
         File objFile = new File(inFile);
         int reqLen = (int) objFile.length();
         byte[] reqBytes = new byte[reqLen];
         FileInputStream inStream = new FileInputStream(objFile);
         inStream.read(reqBytes);
         inStream.close();

// Sending request
         out.println("Connecting to "+host+" at "+port);
         Socket con = new Socket(host,port);
         OutputStream reqStream = con.getOutputStream();
         reqStream.write(reqBytes);
         reqStream.flush();

// Reading response
         byte[] byteBuf = new byte[1024];
         FileOutputStream outStream = new FileOutputStream(outFile);
         InputStream resStream = con.getInputStream();
         int resLen = 0;
         int len = resStream.read(byteBuf);
         while (len > -1) {
            resLen += len;
            outStream.write(byteBuf,0,len);
            out.println("Bytes received: "+len);
            len = resStream.read(byteBuf);
         }

         reqStream.close();
         resStream.close();
         outStream.close();

// Output counts
         out.println("Request length: "+reqLen);
         out.println("Response length: "+resLen);
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}

Note that:

I tested this program with several standard communication protocols like HTTP 1.0, HTTP 1.1, SOAP 1.1 and SOAP 1.2. My program worked fine in all cases. If you are interested in request and response examples of those protocols, see related Perl tutorials in this book.

Last update: 2009.

Table of Contents

 About This Book

 Introduction to Web Service

 Introduction to SOAP (Simple Object Access Protocol)

 SOAP Message Structure

 SOAP Message Transmission and Processing

 SOAP Data Model

 SOAP Encoding

 SOAP RPC Presentation

 SOAP Properties Model

 SOAP Message Exchange Patterns

 SOAP HTTP Binding

 SOAP Perl Implementations

 SOAP PHP Implementations

 SOAP Java Implementations

 Perl SOAP::Lite - SOAP Server-Client Communication Module

 Perl Socket Test Program for HTTP and SOAP

 Perl SOAP::Lite for GetSpeech SOAP 1.1 Web Service

 Perl SOAP::Lite 0.710 for SOAP 1.2 Web Services

 Perl SOAP::Lite 0.710 for WSDL

 PHP SOAP Extension Client Programs

 PHP SOAP Extension Server Programs

Java Socket and HttpURLConnection for SOAP

SocketRequestResponse.java - Socket Client Testing Program

 SocketRequestResponseServer.java - Socket Server Testing Program

 Capturing the HTTP Request from a Browser

 "read(byteBuf) = -1" Not Working

 Using java.net.HttpURLConnection to Send SOAP Messages

 Using HttpURLConnection to Call GetSpeech SOAP 1.1

 Capturing HTTP Request Generated by the HttpURLConnection Class

 Calling GetSpeech SOAP 1.1 Web Service

 Using HttpURLConnection to Call GetSpeech SOAP 1.2

 Calling GetSpeech SOAP 1.2 Web Service

 SAAJ - SOAP with Attachments API for Java

 SoapUI - SOAP Web Service Testing Tool

 WS-Security - SOAP Message Security Extension

 WS-Security X.509 Certificate Token

 Web Services and SOAP Terminology

 References

 PDF Printing Version