Restlet 2.0 与 Spring集成，并遵循JAX-RS标准，JSR311

      先声明我只是给出一个work-around plan，还有些不尽如人意的地方（文章最后会指出）。
首先，给出web.xml 和spring cofng xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>org.brianlabs.filter.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>restserver</servlet-name>
<servlet-class>org.restlet.ext.spring.RestletFrameworkServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:/ApplicationContext-restlet.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>restserver</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>

ApplicationContext-restlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd" >

<bean id="root" class="org.restlet.ext.spring.SpringComponent">
<property name="defaultTarget" ref="restServer" />
</bean>

<bean id="restServer" class="org.restlet.ext.jaxrs.JaxRsApplication">
<property name="objectFactory" ref="springJaxObjectFactory"/>
<property name="applications" ref="springJaxConfig"/>
</bean>

<bean id="root.context" class="org.springframework.beans.factory.config.PropertyPathFactoryBean"/>

<bean id="springJaxObjectFactory" class="org.brianlabs.restlet.spring.SpringJaxObjectFactory">
<constructor-arg ref="jaxBeanCollection" />
</bean>

<bean id="springJaxConfig" class="org.brianlabs.restlet.spring.SpringJaxConfig">
<constructor-arg ref="jaxBeanCollection" />
</bean>

<bean id="jaxBeanCollection" class="org.brianlabs.restlet.spring.JaxBeanCollection">
<property name="beanNames">
<list>
<value>helloWorldResource</value>
</list>
</property>
</bean>

<bean id="helloWorldResource" class="org.brianlabs.restlet.resources.HelloWorldresource" scope="prototype" />

</beans>

SpringJaxObjectFactory

package org.brianlabs.restlet.spring;

import org.restlet.ext.jaxrs.InstantiateException;
import org.restlet.ext.jaxrs.ObjectFactory;

/**
* The spring-friendly class responsible for configuring the jax-rs object construction.
* @author Brian Ling
*
*/
public class SpringJaxObjectFactory implements ObjectFactory {
/** The jax-bean collection that drives this component. **/
private JaxBeanCollection myBeanCollection;

/**
* Create the Spring Jax Object Factory.
* @param beanCollection The jax-bean collection that will drive this component.
*/
public SpringJaxObjectFactory(final JaxBeanCollection beanCollection) {
this.myBeanCollection = beanCollection;
}

@Override
public <T> T getInstance(final Class<T> jaxRsClass) throws InstantiateException {
T bean = myBeanCollection.getBean(jaxRsClass);
return bean;
}
}

SprinJaxConfig

package org.brianlabs.restlet.spring;

import java.util.Set;

/**
* The spring-friendly class responsible for configuring the jax-rs context.
* @author Brian Ling
*
*/
public class SpringJaxConfig extends javax.ws.rs.core.Application {
/** The jax-bean collection that drives this component. **/
private JaxBeanCollection myBeanCollection;

/**
* Create the Spring Jax Config.
* @param beanCollection The jax-bean collection that will drive this component.
*/
public SpringJaxConfig(final JaxBeanCollection beanCollection) {
this.myBeanCollection = beanCollection;
}

@Override
public Set<Class<?>> getClasses() {
return myBeanCollection.getBeanTypes();
}
}

HelloWorldresource

package org.brianlabs.restlet.resources;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

import org.brianlabs.restlet.RestDictionary;

@Path(RestDictionary.BASE_HELLO_WORLD_PATH)
public class HelloWorldresource extends StandardResource {

@GET
@Produces("text/plain")
public String getPlain() {
return "This is an easy resource (as plain text)";
}
}

RestDictionary

package org.brianlabs.restlet;

public class RestDictionary {
public final static String BASE_HELLO_WORLD_PATH="/restlet/hello";
public static final String JSON_OUTPUT = "application/json";
public static final String HTML_TEXT_OUTPUT = "text/html";
public static final String ID = "id";
}

不足：

1.    解析path对应到具体Resource Class时，需要考虑到context的root path，如果在servlet request propogate的时候，修改URL也是个work around 方法，可以参考http://code.google.com/p/urlrewritefilter/

2. id为jaxBeanCollection的Spring Bean，继承于org.springframework.beans.factory.BeanFactoryAware，在spring配置里再嵌套个BeanFactory，似乎有些可以简化的地方。

附录：

pom.xml

<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>org.brianlabs</groupId>
<artifactId>restlet</artifactId>
<packaging>war</packaging>
<version>0.0.1-SN
4000
APSHOT</version>
<name>restlet J2EE 1.4 Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>

<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>

<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.spring</artifactId>
<version>2.0.9</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet</artifactId>
<version>2.0.9</version>
</dependency>
<dependency>
<groupId>org.restlet.jee</groupId>
<artifactId>org.restlet.ext.jaxrs</artifactId>
<version>2.0.9</version>
</dependency>

<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.15</version>
<exclusions>
<exclusion>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
</exclusion>
<exclusion>
<groupId>javax.jms</groupId>
<artifactId>jms</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jdmk</groupId>
<artifactId>jmxtools</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.jmx</groupId>
<artifactId>jmxri</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
<finalName>restlet</finalName>
</build>

<repositories>
<repository>
<id>maven-restlet</id>
<name>Public online Restlet repository</name>
<url>http://maven.restlet.org</url>
</repository>
</repositories>
</project>