spring拦截器之向页面传入项目地址

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1.为啥向页面传入项目地址？

比如在引进css文件地址的时候通常是这样的

<link type="text/css" rel="stylesheet" href="http://localhost:8080/test/css/main.css">
或者

<link type="text/css" rel="stylesheet" href="./resource/css/main.css">
在页面中我们经常重复用到如：http://localhost:8080/test的地址，现在我们利用拦截器向页面传入项目地址

2.向spring配置文件中添加拦截器配置

<mvc:interceptors>   <mvc:interceptor>      <mvc:mapping path="/**" />  拦截器拦截哪些地址在此是拦截所有      <bean class="cn.tsjcate.framework.web.interceptor.CtxInterceptor" />  拦截器所对应的bean   </mvc:interceptor></mvc:interceptors>

3.拦截器

package cn.tsjcate.framework.web.interceptor;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;/** * */public class CtxInterceptor implements HandlerInterceptor {public static final String CONTEXT_NAME = "ctx";public static final String SCHEME_SUFFEX = "://";public static final String SEPARATE_SERVER_PORT = ":";@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object arg2, Exception e) throws Exception {}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object args, ModelAndView modelAndView) throws Exception {if (modelAndView == null || modelAndView.getModel() == null) {return;}StringBuffer ctx = new StringBuffer();ctx.append(request.getScheme());//  httpctx.append(SCHEME_SUFFEX);//      ://ctx.append(request.getServerName());// ip地址（域名）if (request.getServerPort() != 80) {ctx.append(SEPARATE_SERVER_PORT);ctx.append(request.getServerPort());}ctx.append(request.getContextPath());//添加站点的根目录//到这里就是(如)    http://localhost:8080/adminmodelAndView.getModel().put(CONTEXT_NAME, ctx.toString());//重定向操作特殊处理if (modelAndView.getViewName().startsWith("redirect:")) {modelAndView.getModel().clear();}}@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {return true;}}

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