tomcat - 在/static/* 上下文中提供静态资源，同时保持我的 servlet 处理/* 上下文

Question

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Answer 1

这里有一个非常干净的解决这个问题的方法:http://www.kuligowski.pl/java/rest-style-urls-and-url-mapping-for-static-content-apache-tomcat,5 :

Unfortunately after looking into DefaultServlet source I found that DefaultServlet takes only pathInfo part of requested URL, so if your request is /static/styles.css, container translates it into /styles.css. Servlet part is omitted by the DefaultServlet. If you want to access such css file you should use /static/static/styles.css request url.

The simple solution of our problem is to write DefaultFilter class and place it at the beginning of web.xml file. This filter will forward all static content calls to DefaultServlet.

定义一个过滤器，它将请求分派(dispatch)给默认的 servlet:

public class DefaultFilter implements Filter {  
  
    private RequestDispatcher defaultRequestDispatcher;  
  
    @Override  
    public void destroy() {}  

    @Override  
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)   
          throws IOException, ServletException {  
        defaultRequestDispatcher.forward(request, response);  
    }  

    @Override  
    public void init(FilterConfig filterConfig) throws ServletException {  
        this.defaultRequestDispatcher =   
            filterConfig.getServletContext().getNamedDispatcher("default");  
    }  
}

将过滤器(在其他过滤器之前)添加到 web.xml:

<filter>  
    <filter-name>default</filter-name>  
    <servlet-name>default</servlet-name>  
    <filter-class>pl.kuligowski.example.DefaultFilter</filter-class>  
</filter>  
<filter-mapping>  
    <filter-name>default</filter-name>  
    <url-pattern>/static/*</url-pattern>  
    <url-pattern>*.ico</url-pattern>  
</filter-mapping>

Only static content calls are matched to DefaultFilter, which simply breaks the filter chain and forwards the request to the DefaultServlet.