RESTful Web Services in Spring 3（下）转载

上一篇我主要发了RESTful Web Services in Spring 3的服务端代码，这里我准备写客户端的代码。

上篇得连接地址为：/article/3915890.html

开始本篇了：

注:附件里有源码，下载即可，依赖包请在spring网获得，谢谢。

applicationContext.xml:

Xml代码


<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:oxm="http://www.springframework.org/schema/oxm"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd">
<context:component-scan base-package="com.informit.articleservice" />

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">
<property name="messageConverters">
<list>
<!-- We only have one message converter for the RestTemplate, namely the XStream Marshller -->
<bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
<constructor-arg>
<bean class="org.springframework.oxm.xstream.XStreamMarshaller">

<!-- Tell XStream to find the alias names in the following classes -->
<property name="annotatedClasses">
<list>
<value>com.informit.articleservice.model.Article</value>
<value>com.informit.articleservice.model.Category</value>
</list>
</property>
</bean>
</constructor-arg>
</bean>
</list>
</property>
</bean>

</beans>

applicationContext.xml声明了一个bean,名restTemplate，implemented by org.springframework.web.client.RestTemplate，RestTemplate 类提供了一个setter来声明message converters，在这个属性我们提供一个包含一个简单bean的list：a MarshallingHttpMessageConverter，这是你的实体信息声明的地方

restTemplate bean声明后，ArticleClient 使用了restTemplate来调取ArticleService：

Java代码


package com.informit.articleservice.client;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

import com.informit.articleservice.model.Article;
import com.informit.articleservice.model.Category;

@Component("articleClient")
public class ArticleClient {

@Autowired
protected RestTemplate restTemplate;

private final static String articleServiceUrl = "http://localhost:8082/articleservice/";

@SuppressWarnings("unchecked")
public List<Category> getCategories() {
return restTemplate.getForObject(articleServiceUrl + "article", List.class);
}

public Article getArticle(String category, int id) {
return restTemplate.getForObject(articleServiceUrl + "article/{category}/{id}", Article.class, category, id);
}

@SuppressWarnings("unchecked")
public void delCategories() {
restTemplate.delete(articleServiceUrl + "article");
}

@SuppressWarnings("unchecked")
public List<Category> postCategories() {
Map<String, String> params = new HashMap<String, String>();
params.put("name", "jizhong");
return restTemplate.postForObject(articleServiceUrl + "addarticle/{name}", null, List.class, params);

}

}

在这里RestTemplate是自动加载的（auto-wired）,你会注意到ArticleClient被加上了@Component annotation而且applicationContext.xml自动扫描com.informit.articleservice包或他的子包，因此当ArticleClient通过application context被loaded时，他会自动作为一个接口来实现RestTemplate实例

RestTemplate的相关使用的方法在文档中是这样写的：

delete(): deletes an object hosted by the web service
getForObject(): executes the HTTP GET command and returns the requested object
headForHeaders(): executes the HTTP HEAD command and returns the headers for the requested service
optionsForAllow(): executes the HTTP OPTIONS command and returns list of content types the the request service allows
postForLocation: executes the HTTP POST command and returns the location header value
postForObject(): executes the HTTP POST command and returns the object at the specified URL
put(): executes the HTTP PUT command and sends the specified object to the web service
execute(): provides fine grained control if one of the aforementioned methods does not suit your needs

接下来列出测试类：

Java代码


package com.informit.resttemplateexample;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.informit.articleservice.client.ArticleClient;
import com.informit.articleservice.model.Category;

public class RestTemplateExample {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
ArticleClient articleClient = applicationContext.getBean("articleClient", ArticleClient.class);

//get operate
// Article article = articleClient.getArticle("fun", 1);
// System.out.println("Article: " + article.getBody());
//
// List<Category> categories = articleClient.getCategories();
// for (Category category : categories) {
// System.out.println("Category: " + category);
// }

//delete operate
//articleClient.delCategories();

//post operate
List<Category> categories = articleClient.postCategories();

}
}

好了，然后本地跑一下就可以了，当然前提是一定把服务端跑起来哦....

注：详细代码在附件，JAR包还是自己下哈，终于写完了，有点累，但是有收获。

resttemplateexample_20100223.rar (13.2 KB)
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