使用 web.xml 在 Tomcat 8 上设置自定义过滤器

Question

我想使用此方法启用 CORS Tomcat 8（自定义过滤器） Tomcat CORS filter

我对在 web.xml 中调用自定义过滤器的步骤感到困惑。

如何设置.java文件？这个文件（SimpleCORSFilter）的目录在哪里？

public class SimpleCORSFilter implements Filter {

  public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
      HttpServletResponse response = (HttpServletResponse) res;
      response.setHeader("Access-Control-Allow-Origin", "*");
      response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
      response.setHeader("Access-Control-Max-Age", "3600");
      response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
      chain.doFilter(req, res);
  }
}

Answer 1

将过滤器定义为example连接到URL：

<filter>
    <filter-name>cors</filter-name>
    <filter-class>com.robin.filters.SimpleCORSFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

将过滤器定义为example连接到servlet：

<filter>
    <filter-name>MyFilter</filter-name>
    <display-name>MyFilter</display-name>
    <filter-class>com.xxx.yyy.zzz.MyFilter</filter-class>
</filter>

<filter-mapping>
   <filter-name>MyFilter</filter-name>
   <servlet-name>MyAction</servlet-name>
</filter-mapping>