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：http://yangjizhong.iteye.com/blog/600540

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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