Difference between revisions of "Jetty/Tutorial/Jetty HelloWorld"

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{{Jetty Tutorial
 
{{Jetty Tutorial
 
| introduction =  
 
| introduction =  
This tutorial shows you how you can developed code against the Jetty API with the jetty classes on  
+
This tutorial shows you how you can develop code against the Jetty API with the jetty classes on  
your class path.  If you wish to use maven or standard web applications, then please see the  
+
your class path.  If you want to use Maven or standard web applications, see the  
 
[[Jetty/Tutorial/Jetty_and_Maven_HelloWorld|Jetty and Maven HelloWorld tutorial]].
 
[[Jetty/Tutorial/Jetty_and_Maven_HelloWorld|Jetty and Maven HelloWorld tutorial]].
  
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=== Downloading the Jars ===
 
=== Downloading the Jars ===
Jetty is decomposed into many [[Jetty/Reference/Dependencies|jars and dependencies]] so that a minimal foot print can be achieved by selecting the minimal set of jars.  Typically it is best to use something like maven to manage jars (see [[Jetty/Tutorial/Jetty_and_Maven_ HelloWorld|Jetty and Maven HelloWorld Tutorial]]), but for this tutorial, we will use an aggregate jar that contains all of the jetty classes in one jar.  
+
Jetty is decomposed into many [[Jetty/Reference/Dependencies|jars and dependencies]] to achieve a minimal footprint by selecting the minimal set of jars.  Typically it is best to use something like Maven to manage jars (see [[Jetty/Tutorial/Jetty_and_Maven_ HelloWorld|Jetty and Maven HelloWorld Tutorial]]), but for this tutorial, we will use an aggregate jar that contains all of the jetty classes in one jar.  
  
The jetty aggregate-all jar and the servlet api jar can be manually downloaded using [http://www.gnu.org/software/wget/ wget] or similar command (eg [http://curl.haxx.se/ curl]) or a browser.  Use wget as follows:
+
You can manually download the jetty aggregate-all jar and the servlet api jar using [http://www.gnu.org/software/wget/ wget] or similar command (eg [http://curl.haxx.se/ curl]) or a browser.  Use wget as follows:
  
 
<source lang="bash">
 
<source lang="bash">
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=== Writing a HelloWorld Example ===
 
=== Writing a HelloWorld Example ===
  
The [[Jetty/Tutorial/Embedding Jetty]] tutorial contains many examples of writing against the Jetty API. For this tutorial, we will use a simple HelloWorld handler with a main method to run the server.   In and editor, edit the file <tt>HelloWorld.java</tt> and add the following content:
+
The [[Jetty/Tutorial/Embedding Jetty]] tutorial contains many examples of writing against the Jetty API. For this tutorial, we will use a simple HelloWorld handler with a main method to run the server. In an editor, edit the file <tt>HelloWorld.java</tt> and add the following content:
  
 
<source lang="java">
 
<source lang="java">
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=== Compiling the HelloWord example ===
 
=== Compiling the HelloWord example ===
The following command will compile the HelloWorld class:
+
The following command compiles the HelloWorld class:
  
 
<source lang="bash">
 
<source lang="bash">
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=== Running the Handler and Server ===
 
=== Running the Handler and Server ===
The following command will run the HelloWorld example:
+
The following command runs the HelloWorld example:
  
 
<source lang="bash">
 
<source lang="bash">

Revision as of 14:27, 12 August 2010



Contents

Introduction

This tutorial shows you how you can develop code against the Jetty API with the jetty classes on your class path. If you want to use Maven or standard web applications, see the Jetty and Maven HelloWorld tutorial.

Details

Downloading the Jars

Jetty is decomposed into many jars and dependencies to achieve a minimal footprint by selecting the minimal set of jars. Typically it is best to use something like Maven to manage jars (see Jetty and Maven HelloWorld Tutorial), but for this tutorial, we will use an aggregate jar that contains all of the jetty classes in one jar.

You can manually download the jetty aggregate-all jar and the servlet api jar using wget or similar command (eg curl) or a browser. Use wget as follows:

mkdir Demo
cd Demo
JETTY_VERSION=7.0.2.v20100331
wget -U none http://repo1.maven.org/maven2/org/eclipse/jetty/aggregate/jetty-all/$JETTY_VERSION/jetty-all-$JETTY_VERSION.jar
wget -U none http://repo1.maven.org/maven2/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar

Writing a HelloWorld Example

The Jetty/Tutorial/Embedding Jetty tutorial contains many examples of writing against the Jetty API. For this tutorial, we will use a simple HelloWorld handler with a main method to run the server. In an editor, edit the file HelloWorld.java and add the following content:

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
 
import java.io.IOException;
 
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
 
public class HelloWorld extends AbstractHandler
{
    public void handle(String target,
                       Request baseRequest,
                       HttpServletRequest request,
                       HttpServletResponse response) 
        throws IOException, ServletException
    {
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        baseRequest.setHandled(true);
        response.getWriter().println("<h1>Hello World</h1>");
    }
 
    public static void main(String[] args) throws Exception
    {
        Server server = new Server(8080);
        server.setHandler(new HelloWorld());
 
        server.start();
        server.join();
    }
}

Compiling the HelloWord example

The following command compiles the HelloWorld class:

javac -cp servlet-api-2.5.jar:jetty-all-$JETTY_VERSION.jar HelloWorld.java

Running the Handler and Server

The following command runs the HelloWorld example:

java -cp .:servlet-api-2.5.jar:jetty-all-$JETTY_VERSION.jar HelloWorld

You can now point your browser at http://localhost:8080 to see your hello world page.


Next Steps