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【原创】使用Jersey体验REST

REST 
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一直想体验一下REST风格的Web服务，最近关注了一下Jersey这个Java的REST实现，记录一下备忘。

 

这里有一篇不错的文章：http://www.vogella.com/articles/REST/article.html

 

REST的Resource类实现：

 

package wh.rest.jersey.first;

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

/**
 * @Author:WangHuan
 * 
 * @Date:2012-5-29
 *
 * @TODO:
 */
@Path("/hello")
public class HelloResource {
	// This method is called if TEXT_PLAIN is request
	@GET
	@Produces(MediaType.TEXT_PLAIN)
	public String sayPlainTextHello() {
		return "Hello Jersey";
	}

	// This method is called if XML is request
	@GET
	@Produces(MediaType.TEXT_XML)
	public String sayXMLHello() {
		return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";
	}

	// This method is called if HTML is request
	@GET
	@Produces(MediaType.TEXT_HTML)
	public String sayHtmlHello() {
		return "<html> " + "<title>" + "Hello Jersey" + "</title>"
				+ "<body><h1>" + "Hello Jersey" + "</body></h1>" + "</html> ";
	}
}

 

web.xml

 

<?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>wh.rest.jersey.first</display-name>
	<servlet>
		<servlet-name>Jersey REST Service</servlet-name>
		<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
		<init-param>
			<param-name>com.sun.jersey.config.property.packages</param-name>
			<param-value>wh.rest.jersey.first</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Jersey REST Service</servlet-name>
		<url-pattern>/rest/*</url-pattern>
	</servlet-mapping>
</web-app>

 

客户端调用：

 

package wh.rest.jersey.first;

import java.net.URI;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.UriBuilder;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;


/**
 * @Author:WangHuan
 * 
 * @Date:2012-5-29
 *
 * @TODO:
 */

public class HelloClient {
	public static void main(String[] args) {
		ClientConfig config = new DefaultClientConfig();
		Client client = Client.create(config);
		WebResource service = client.resource(getBaseURI());
		// Fluent interfaces
		System.out.println(service.path("rest").path("hello").accept(
				MediaType.TEXT_PLAIN).get(ClientResponse.class).toString());
		// Get plain text
		System.out.println(service.path("rest").path("hello").accept(
				MediaType.TEXT_PLAIN).get(String.class));
		// Get XML
		System.out.println(service.path("rest").path("hello").accept(
				MediaType.TEXT_XML).get(String.class));
		// The HTML
		System.out.println(service.path("rest").path("hello").accept(
				MediaType.TEXT_HTML).get(String.class));

	}

	private static URI getBaseURI() {
		return UriBuilder.fromUri(
				"http://localhost:8080/jersey").build();
	}
}

 

最终的访问URL是：http://localhost:8080/jersey/rest/hello

其中hello对应的实现类中的

@Path("/hello")
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