springmvc rest風格的例項程式碼demo講解
Rest介紹
/blog / HTTP GET => 得到id = 1的blog
/ blog / HTTP DELETE => 刪除 id = 1的blog
/ blog / HTTP PUT => 更新id = 1的blog
/ blog HTTP POST => 新增BLOG
以下詳細解一下spring rest使用.
首先,我們帶著如下兩個問題檢視本文。
1.如何在java構造沒有副檔名的RESTful url,如 /forms/1,而不是 /forms/1.do
2.瀏覽器的form標籤不支援提交delete,put請求,如何曲線解決
springmvc rest 實現
springmvc的resturl是通過@RequestMapping 及@PathVariable annotation提供的,
通過如@RequestMapping(value="/blog /{id}",method=RequestMethod.DELETE)即可處理/blog/1 的delete請求.
@RequestMapping(value=" /blog/{id} " ,method=RequestMethod.DELETE) public ModelAndView delete(@PathVariable Long id,HttpServletRequest request,HttpServletResponse response) }
@RequestMapping @PathVariable如果URL中帶引數,則配合使用,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
<!-- 該servlet為tomcat,jetty等容器提供,將靜態資源對映從/改為/static/目錄,如原來訪問 http://localhost/foo.css ,現在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重寫filter,用於將訪問靜態資源http://localhost/foo.css 轉為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>
<!-- 覆蓋default servlet的/, springmvc servlet將處理原來處理靜態資源的對映 -->
<servlet-mapping>
<servlet-name> springmvc </servlet-name>
<url-pattern> / </url-pattern>
</servlet-mapping>
<!-- 瀏覽器不支援put,delete等method,由該filter將/blog?_method=delete轉換為標準的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,使用如下兩個class啟用@RequestMapping annotation
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
3.Controller編寫
/***/ */
@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() 方法是由於add這個方法會被maxthon瀏覽器當做廣告連結過濾掉,因為包含ad字元)
4.jsp 編寫
<form:form action="${ctx}/userinfo${userInfo.userId}" method="put">
</form:form>
生成的html內容如下, 生成一個hidden的_method=put,並於web.xml中的HiddenHttpMethodFilter配合使用,在服務端將post請求改為put請求
<form id="userInfo" action="/springmvc_rest_demo/userinfo/2" method="post">
<input type="hidden" name="_method" value="put" />
</form>
另外一種方法是你可以使用ajax傳送put,delete請求.
5.靜態資源的URL重寫
如上我們描述,現因為將default servlet對映至/static/的子目錄,現我們訪問靜態資源將會帶一個/static/字首.
如 /foo.gif, 現在訪問該檔案將是 /static/foo.gif.
<urlrewrite>
<!-- 訪問jsp及jspx將不rewrite url,其它.js,.css,.gif等將重寫,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>