Create a simple HTTP server with Java

Question

What s the easiest way to create a simple HTTP server with Java  Are there any libraries in commons to facilitate this  I only need to respond to GET POST  and I can t use an application server   What s the easiest way to accomplish this

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I wrote a tutorial explaining how to write a simple HTTP server a while back in Java   Explains what the code is doing and why the server is written that way as the tutorial progresses   Might be useful http   kcd sytes net articles simple web server php

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Undertow is a lightweight non-blocking embedded web server that you can get up and running very quickly   public static void main String   args    Undertow builder            addHttpListener 8080   localhost            setHandler  exchange  - gt  exchange getResponseSender   send  hello world             build   start

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Java 6 has a default embedded http server   Check the thread here  By the way  if you plan to have a rest web service  here is a simple example using jersey

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Embedding Tomcat is relatively painless as such things go  Here s a good StackOverflow reference about it

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The easiest is Simple there is a tutorial  no WEB-INF not Servlet API no dependencies  Just a simple lightweight HTTP server in a single JAR

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I have implemented one link  N B  for processing json  i used jackson  You can remove that also  if you need

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Use Jetty  Here s the official example for embedding Jetty   Here s an outdated tutorial   Jetty is pretty lightweight  but it does provide a servlet container  which may contradict your requirement against using an  quot application server quot   You can embed the Jetty server into your application  Jetty allows EITHER embedded OR servlet container options  Here is one more quick get started tutorial along with the source code

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This is how I would go about this    Start a ServerSocket listening  probably on port 80   Once you get a connection request  accept and pass to another thread process  this leaves your ServerSocket available to keep listening and accept other connections   Parse the request text  specifically  the headers where you will see if it is a GET or POST  and the parameters passed  Answer with your own headers  Content-Type  etc   and the HTML    I find it useful to use Firebug  in Firefox  to see examples of headers  This is what you want to emulate   Try this link   - Multithreaded Server in Java

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I m suprised this example is nt here   http   hc apache org httpcomponents-core-ga httpcore examples org apache http examples ElementalHttpServer java  EDIT    The above link is not reachable  Here is an excerpt from the POST example followed by the link to the HTTP examples    if   conn isOpen              Socket socket   new Socket host getHostName    host getPort             conn bind socket             BasicHttpEntityEnclosingRequest request   new     BasicHttpEntityEnclosingRequest  POST         servlets-examples servlet RequestInfoExample        request setEntity requestBodies i        System out println   gt  gt  Request URI      request getRequestLine   getUri         httpexecutor preProcess request  httpproc  coreContext       HttpResponse response   httpexecutor execute request  conn  coreContext       httpexecutor postProcess response  httpproc  coreContext       System out println   lt  lt  Response      response getStatusLine         System out println EntityUtils toString response getEntity          System out println                        if   connStrategy keepAlive response  coreContext         conn close          else       System out println  Connection kept alive               http   hc apache org httpcomponents-core-ga httpcore examples org apache http examples

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Jetty is a great way to easily embed an HTTP server   It supports it s own simple way to attach handlers and is a full J2EE app server if you need more functionality

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If you are using the Sun JDK you can use this built in library Look at this site on how to use   If n ot there are several Open Source HTTP Servers here which you can embed into your software

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I just added a public repo with a ready to run out of the box server using Jetty and JDBC to get your project started   Pull from github here  https   github com waf04 WAF-Simple-JAVA-HTTP-MYSQL-Server git

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A servlet container is definitely the way to go  If Tomcat or Jetty are too heavyweight for you  consider Winstone or TTiny

[java] Create a simple HTTP server with Java?

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