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 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:
- 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:
- 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)
- 下载次数: 337