springmvc rest风格的实例代码demo讲解

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代码下载地址:http://www.zuidaima.com/share/1751863912057856.htm

Rest介绍

/blog /  HTTP GET =>  得到id = 1的blog
 / blog /  HTTP DELETE => 删除 id = 1的blog
 / blog /  HTTP PUT =>  更新id = 1的blog
 / blog   HTTP POST =>   新增BLOG

    以下详细解一下spring rest使用.

    首先,我们带着如下两个问题查看本文。

        1.如何在java构造没有扩展名的RESTful url,如 /forms/1,而不是 /forms/1.do

        2.浏览器的form标签不支持提交delete,put请求,如何曲线解决

    springmvc rest 实现

    springmvc的resturl是通过@RequestMapping 及@PathVariable annotation提供的,
    通过如@RequestMapping(value="/blog /{id}",method=RequestMethod.DELETE)即可处理/blog/1 的delete请求.

@RequestMapping(value=" /blog/{id} " ,method=RequestMethod.DELETE)
 public  ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response)  }

    @RequestMapping @PathVariable如果URL中带参数,则配合使用,如

@RequestMapping(value=" /blog/{blogId}/message/{msgId} " ,method=RequestMethod.DELETE)
 public  ModelAndView delete(@PathVariable( " blogId " ) Long blogId,@PathVariable( " msgId " ) Long msgId,HttpServletRequest request,HttpServletResponse response)  }

    1.springmvc web.xml配置

<!-- 该servlet为tomcat,jetty等容器提供,将静态资源映射从/改为/static/目录,如原来访问 http://localhost/foo.css ,现在http://localhost/static/foo.css  --> 
   <servlet-mapping> 
   <servlet-name> default </servlet-name> 
   <url-pattern> /static/* </url-pattern> 
   </servlet-mapping> 
   <servlet> 
     <servlet-name> springmvc </servlet-name> 
     <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> 
     <load-on-startup> </load-on-startup> 
   </servlet> 
 
   <!--  URL重写filter,用于将访问静态资源http://localhost/foo.css 转为http://localhost/static/foo.css  --> 
   <filter> 
   <filter-name> UrlRewriteFilter </filter-name> 
   <filter-class> org.tuckey.web.filters.urlrewrite.UrlRewriteFilter </filter-class> 
   <init-param> 
      <param-name> confReloadCheckInterval </param-name> 
      <param-value> </param-value> 
     </init-param> 
   <init-param> 
         <param-name> logLevel </param-name> 
         <param-value> DEBUG </param-value> 
       </init-param> 
   </filter> 
   <filter-mapping> 
   <filter-name> UrlRewriteFilter </filter-name> 
   <url-pattern> /* </url-pattern> 
   </filter-mapping> 
 
   <!--  覆盖default servlet的/, springmvc servlet将处理原来处理静态资源的映射  --> 
   <servlet-mapping> 
     <servlet-name> springmvc </servlet-name> 
     <url-pattern> / </url-pattern> 
   </servlet-mapping> 
 
   <!--  浏览器不支持put,delete等method,由该filter将/blog?_method=delete转换为标准的http delete方法  --> 
   <filter> 
   <filter-name> HiddenHttpMethodFilter </filter-name> 
   <filter-class> org.springframework.web.filter.HiddenHttpMethodFilter </filter-class> 
   </filter> 
 
   <filter-mapping> 
   <filter-name> HiddenHttpMethodFilter </filter-name> 
   <servlet-name> springmvc </servlet-name> 
   </filter-mapping>

2.webapp/WEB-INF/springmvc-servlet.xml配置,使用如下两个class激活@RequestMapping annotation

<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/> 
 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> 
 

3.Controller编写

/***/   */
 @Controller
 @RequestMapping( " /userinfo " )
 public   class  UserInfoController  extends  BaseSpringController }
 
/userinfo  => index()
   /userinfo/new => _new()
   /userinfo/{id} => show()
   /userinfo/{id}/edit  => edit()
   /userinfo POST => create()
   /userinfo/{id} PUT => update()
   /userinfo/{id} DELETE => delete()
   /userinfo DELETE => batchDelete()
 

 注(不使用 /userinfo/add  => add() 方法是由于add这个方法会被maxthon浏览器当做广告链接过滤掉,因为包含ad字符)

4.jsp 编写

<form:form action="${ctx}/userinfo${userInfo.userId}" method="put"> 
 </form:form>

生成的html内容如下, 生成一个hidden的_method=put,并于web.xml中的HiddenHttpMethodFilter配合使用,在服务端将post请求改为put请求

<form id="userInfo" action="/springmvc_rest_demo/userinfo/2" method="post">
   <input  type="hidden" name="_method" value="put" /> 
 </form>

另外一种方法是你可以使用ajax发送put,delete请求.

5.静态资源的URL重写

        如上我们描述,现因为将default servlet映射至/static/的子目录,现我们访问静态资源将会带一个/static/前缀.

        如 /foo.gif, 现在访问该文件将是 /static/foo.gif.

        那如何避免这个前缀呢,那就是应用URL rewrite,现我们使用 http://tuckey.org/urlrewrite/, 重写规则如下   

<urlrewrite>
    <!--  访问jsp及jspx将不rewrite url,其它.js,.css,.gif等将重写,如 /foo.gif => /static/foo.gif --> 
    <rule> 
     <condition  operator="notequal" next="and" type="request-uri">.*.jsp </condition> 
     <condition  operator="notequal" next="and" type="request-uri"> .*.jspx </condition> 
      <from> ^(/.*\..*)$ </from> 
      <to> /static$1 </to> 
    </rule> 
 </urlrewrite>

 

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