Restlet入门示例

本文的目的在于完成一个Restlet入门示例。
首先，是一个Stand alone应用。
然后，将其部署与Tomcat容器中。
最后，完成Restlet与Spring的整合。

1.按照官方教程，完成“firstSteps”

创建一个动态Web工程RestEE，并建立firstSteps包，并复制如下代码到：HelloWorldResource.java

package firstSteps;

import org.restlet.Context;
import org.restlet.Request;
import org.restlet.Response;
import org.restlet.resource.Get;
import org.restlet.resource.ServerResource;

/**
 * Resource which has only one representation.
 */
public class HelloWorldResource extends ServerResource {

    @Get
    public String represent() {
        return "hello, world";
    }

}

2.复制如下代码到FirstStepsApplication.java

package firstSteps;

import org.restlet.Application;
import org.restlet.Restlet;
import org.restlet.routing.Router;

public class FirstStepsApplication extends Application {

    /**
     * Creates a root Restlet that will receive all incoming calls.
     */
    @Override
    public synchronized Restlet createInboundRoot() {
        // Create a router Restlet that routes each call to a new instance of HelloWorldResource.
        Router router = new Router(getContext());

        // Defines only one route
        router.attach("/hello", HelloWorldResource.class);

        return router;
    }

}

3.编写main，复制如下代码到：FirstStepsMain.java

package firstSteps;

import org.restlet.Component;
import org.restlet.data.Protocol;

public class FirtstStepsMain {
	public static void main(String[] args) throws Exception {  
	    // Create a new Component.  
	    Component component = new Component();  
	  
	    // Add a new HTTP server listening on port 8182.  
	    component.getServers().add(Protocol.HTTP, 8182);  
	  
	    // Attach the sample application.  
	    component.getDefaultHost().attach("/firstSteps",  
	            new FirstStepsApplication());  
	  
	    // Start the component.  
	    component.start();  
	} 
}

4.以Java Application运行FirstStepsMain，在浏览器中输入：
http://localhost:8182/hello，将打印“hello, world”信息。

5.修改web.xml，具体代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 
   <display-name>firstSteps</display-name>
   <context-param>  
      <param-name>org.restlet.application</param-name>  
      <param-value>  
         firstSteps.FirstStepsApplication
      </param-value>  
   </context-param>
   <!-- Restlet adapter -->  
   <servlet>  
      <servlet-name>RestletServlet</servlet-name> 
	  <servlet-class>org.restlet.ext.servlet.ServerServlet</servlet-class>
      
      
   </servlet>  
  
   <!-- Catch all requests -->  
   <servlet-mapping>  
      <servlet-name>RestletServlet</servlet-name>  
      <url-pattern>/*</url-pattern>  
   </servlet-mapping>  
</web-app>

6.启动Tomcat，运行该项目。在浏览器中输入：
http://localhost:8080/RestEE/hello，出现“hello, world”信息。

7.集成restlet，spring
7.1 修改web.xml，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 
   <display-name>firststepsservlet</display-name>
      
   <context-param>  
	  <param-name>contextConfigLocation</param-name>  
      <param-value>/WEB-INF/applicationContext.xml</param-value>  
   </context-param>  
    
   <listener>  
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
   </listener>  
   
   <!-- Restlet adapter -->  
   	<servlet>  
      	<servlet-name>RestletServlet</servlet-name>  
       	<servlet-class>org.restlet.ext.spring.SpringServerServlet</servlet-class>
		<init-param>
      		<param-name>org.restlet.component</param-name>   
			<param-value>component</param-value>   
	  	</init-param>
	</servlet>  
  
   <!-- Catch all requests -->  
   <servlet-mapping>  
      <servlet-name>RestletServlet</servlet-name>  
      <url-pattern>/*</url-pattern>  
   </servlet-mapping>  
</web-app>

7.2 application.xml内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
 
 	<bean id="component" class="org.restlet.ext.spring.SpringComponent">
 		<property name="defaultTarget" ref="application" /> 
 	</bean>
 	<bean id="application" class="firstSteps.FirstStepsApplication">
 		<lookup-method name="createRoot" bean="root" />
 	</bean>
	<bean id="root" class="org.restlet.ext.spring.SpringRouter">
        <property name="attachments">
            <map>
                <entry key="/hello">
                    <bean class="org.restlet.ext.spring.SpringFinder">
                        <lookup-method name="create" bean="HelloWorldResource" />
                    </bean>
                </entry>
            </map>
        </property>
    </bean>
    <bean id="HelloWorldResource" class="firstSteps.HelloWorldResource" scope="prototype" />
</beans>

7.3 启动Tomcat，运行该项目。浏览器中输入：
http://localhost:8080/RestEE/hello，出现“hello,world”信息。