• Struts2中默认对以/struts、/static开头URL的处理


    今天试着配置弄个权限,刚一开始就把我卡住了,在web.xml时使用了*.jspx一切正常,可当我将其改为/*全部guolv时发现页面不能加载js、css了,那个郁闷,于是google了下找到答案:“The Dojo files are shipped with Struts 2.0.x within struts2-core-2.0.x.jar. When a request for a resource is received that starts with the /struts URL, the FilterDispatcher serves the corresponding file in struts2-core-2.0.x.jar:/org/apache/struts2/static/. This feature needs to be turned off to use an alternative Dojo profile.凡是用/struts开头的URL,struts2的过滤器都会到struts2-core-2.0.x.jar:/orgapache/struts2/static/下面去找资源。只要在struts.properties文件中更改一个属性,就可以关闭掉这种默认的特性。struts.serve.static=false 。”于是照着更改后,一切就OK了。

    也可以将web.xml的url过滤改为*.xxx(xxx为action后缀名)或将static、struts改为其他名称(如resources)来避免这个问题

    另见http://caoxudong818.iteye.com/blog/1137571如下:

    原因:在struts2的FilterDispatcher类的doFilter方法中,如果请求的是静态资源,struts2会判断该请求是否可以处理,这里的代码如下:

    String resourcePath = RequestUtils.getServletPath(request);  
    if ("".equals(resourcePath) && null != request.getPathInfo()) {  
        resourcePath = request.getPathInfo();  
    }  
    if (staticResourceLoader.canHandle(resourcePath)) {  
        staticResourceLoader.findStaticResource(resourcePath, request, response);  
    } else {  
         // this is a normal request, let it pass through  
         chain.doFilter(request, response);  
    }  
    // The framework did its job here  
    return;  

    其中,在DefaultStaticContentLoader类的canHandle方法中会对请求路径进行判断:

    public boolean canHandle(String resourcePath) {  
        return serveStatic &&   
          (resourcePath.startsWith("/struts") || resourcePath.startsWith("/static"));  
    }  

     这里,serveStatic的值为true,再加上要访问的资源以“/static”开头,所以这里返回true。 

        然后,会进入DefaultStaticContentLoader类的findStaticResource方法,该方法的第一行语句是:

    String name = cleanupPath(path); 

     这里,cleanupPath方法的定义如下: 

    /** 
     * @param path requested path 
     * @return path without leading "/struts" or "/static" 
     */  
    protected String cleanupPath(String path) {  
        //path will start with "/struts" or "/static", remove them  
        return path.substring(7);  
    }  

     struts2把“/static”截掉了,这样,后面再进行解析的时候,就变成了解析对“/top.html”的请求,所以会报404错误。

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  • 原文地址:https://www.cnblogs.com/jice/p/2471313.html
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