Hallo,

hier mal ein kleines Beispiel zu Webservices mit JAX-RS und Jersey:

Unsere Resource:
Code java:
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package de.tutorials.training.jaxrs.examples.ex1.res;
 
import java.util.logging.Logger;
 
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
 
@Path("/helloworld")
public class HelloWorldResource {
    @GET
    @Produces("text/plain")
    @Path("/sayHello/{someName}")
    public String sayHelloTo(@PathParam("someName") String someName){
        String msg = "Hello " + someName;
        Logger.getLogger(getClass().getName()).info("Server: " + msg);
        return msg;
    }
}

Unser (standalone) "Server":
Code java:
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package de.tutorials.training.jaxrs.examples.ex1;
 
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
 
import org.glassfish.grizzly.http.server.HttpServer;
 
import com.sun.jersey.api.container.grizzly2.GrizzlyWebContainerFactory;
 
public class Ex1Server {
    public static void main(String[] args) throws Exception {
        final String baseUri = "http://localhost:4711/";
        final Map<String, String> params = new HashMap<String, String>();
 
        params.put("com.sun.jersey.config.property.packages",
                "de.tutorials.training.jaxrs.examples.ex1.res");
 
        System.out.println("Starting web server...");
 
        HttpServer server = GrizzlyWebContainerFactory.create(baseUri,params);
        Logger.getLogger(Ex1Server.class.getName())
                .info(String
                        .format("Jersey app started with WADL available at %sapplication.wadl\n"
                                + "Try out %shelloworld\nHit enter to stop it...",
                                baseUri, baseUri));
 
        System.in.read();
        server.stop();
        System.exit(0);
    }
}

Unser Client:
Code java:
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package de.tutorials.training.jaxrs.examples.ex1;
 
import java.net.URL;
import java.util.Scanner;
 
public class Ex1Client {
    public static void main(String[] args) throws Exception{
        Scanner scanner = new Scanner(new URL("http://localhost:4711/helloworld/sayHello/tutorials.de").openStream());
        while(scanner.hasNextLine()){
            System.out.println(scanner.nextLine());
        }
        scanner.close();
    }
}

Hier noch das maven Pom.xml:
Code xml:
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>de.tutorias</groupId>
    <artifactId>de.tutorials.training.jaxrs.examples</artifactId>
    <version>0.0.1-SNAPSHOT</version>
 
    <dependencies>
    <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-grizzly2</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
            <groupId>com.sun.grizzly</groupId>
            <artifactId>grizzly-servlet-webserver</artifactId>
            <version>1.9.18-i</version>
        </dependency>
    </dependencies>
 
    <repositories>
        <repository>
            <id>maven2-repository.java.net</id>
            <name>Java.net Repository for Maven</name>
            <url>http://download.java.net/maven/2/</url>
            <layout>default</layout>
        </repository>
        <repository>
            <id>maven-repository.java.net</id>
            <name>Java.net Maven 1 Repository (legacy)</name>
            <url>http://download.java.net/maven/1</url>
            <layout>legacy</layout>
        </repository>
    </repositories>
</project>

Ausgabe Server:
Code :
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Starting web server...
27.06.2011 19:16:48 org.glassfish.grizzly.http.server.NetworkListener start
INFO: Started listener bound to [localhost:4711]
27.06.2011 19:16:48 org.glassfish.grizzly.http.server.HttpServer start
INFO: [HttpServer] Started.
27.06.2011 19:16:48 de.tutorials.training.jaxrs.examples.ex1.Ex1Server main
INFO: Jersey app started with WADL available at http://localhost:4711/application.wadl
Try out http://localhost:4711/helloworld
Hit enter to stop it...
27.06.2011 19:16:52 com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  de.tutorials.training.jaxrs.examples.ex1.res
27.06.2011 19:16:52 com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
  class de.tutorials.training.jaxrs.examples.ex1.res.HelloWorldResource
27.06.2011 19:16:52 com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
27.06.2011 19:16:52 com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.8 06/24/2011 12:17 PM'
27.06.2011 19:16:53 de.tutorials.training.jaxrs.examples.ex1.res.HelloWorldResource sayHelloTo
INFO: Server: Hello tutorials.de

Ausgabe: Client:
Code :
1

Hello tutorials.de

Unter http://localhost:4711/application.wadl bekommen wir auch die WADL Beschreibung (Was WSDL bei normalen Webservices ist WADL für REST Web Services) unseres REST Webservices zu sehen.
Siehe auch:
http://searchsoa.techtarget.com/tip/...answer-to-WSDL
http://wadl.java.net/
Ausgabe:
Code xml:
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<application>
    <doc jersey:generatedBy="Jersey: 1.8 06/24/2011 12:17 PM" />
    <resources base="http://localhost:4711/">
        <resource path="/helloworld">
            <resource path="/sayHello/{someName}">
                <param type="xs:string" style="template" name="someName" />
                <method name="GET" id="sayHelloTo">
                    <response>
                        <representation mediaType="text/plain" />
                    </response>
                </method>
            </resource>
        </resource>
    </resources>
</application>

Gruß Tom