RESTful的理解

RESTful的理解

• 首先REST只是一种风格，不是一种标准
• REST是以资源为中心
• REST充分利用（极端依赖）HTTP协议（增删改查，传统的mvc框架一般只用到了get与post）

特点为：显示的使用不同的http请求方法
1. 在服务器上创建资源你使用post方式传输
2. 若要是检索资源用get方式传输
3. 若要更改某个资源使用put方式传输
4. 删除某个资源使用delete方式传输

读取） [GET] http://www.example.com/photo/logo
仍然保持为 [GET] http://www.example.com/photo/logo

（创建）http://www.example.com/photo/logo/create
改为 [POST] http://www.example.com/photo/logo

（更新）http://www.example.com/photo/logo/update
改为 [PUT] http://www.example.com/photo/logo

（删除）http://www.example.com/photo/logo/delete
改为 [DELETE]  http://www.example.com/photo/logo

信息的传递：目录结构式的ＵＲＬ

实例：http://www.example.com/photo/2010/02/22/{topic}
//使用REST风格传输
http://www.example.com/photo/{year}/{day}/{month}/{topic}
//传统的
http://www.example.com/photo?year=xxxx&day=xxx$month=xxx&topic=xxxx

安全问题：REST可以使用简单有效的安全模型
1. 不发布他的URL
2. 可以根据接收方式对其进行限制，堵塞资源，get只读，post只写等

代码示例：

Controller 代码

@Controller 
public class ArticleController { 

    @RequestMapping(value = "/article/{category}/{id}", method = RequestMethod.GET) 
    public ModelAndView loadArticle(@PathVariable String category, @PathVariable int id, 
            @RequestParam(value = "mode", required = false) String mode) { 
          // ...
    } 

    @RequestMapping(value = "/article", method = RequestMethod.GET) 
    public ModelAndView loadArticleCategories() { 
        // ...
    } 

    @RequestMapping(value = "/article", method = RequestMethod.DELETE) 
    public ModelAndView delArticleCategories() { 
         // ...
    } 

    @RequestMapping(value = "/addarticle", method = RequestMethod.POST) 
    public ModelAndView addArticleCategories(Category category) { 
        // ...
    } 

    @RequestMapping(value = "/addarticle/{name}", method = RequestMethod.POST) 
    public ModelAndView addArticleCategoriesForName(@PathVariable String name) { 
         // ...
    } 

} 

调用

@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); 

    } 

}