春天过滤器没有被调用 [英] Spring Filter not getting invoked

问题描述

过滤器是这样的：

  @Component 
 public class SimpleCORSFilter extends OncePerRequestFilter {
 @Override 
 protected void doFilterInternal（HttpServletRequest req，
 HttpServletResponse res，FilterChain filterChain）
 throws ServletException，IOException {
 System.out.println（EXECUTING）; 
 HttpServletResponse响应=（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，Content-Type）; 
 
 filterChain.doFilter（req，res）; 
 
 
 
 
 
 
 $ b然后，我在web.xml中添加了过滤器，如下所示： 
 
 
 <？xml version =1.0encoding =UTF-8？> 
< web-app xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xmlns =http://java.sun.com/xml/ns / javaee
 xsi：schemaLocation =http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd
 version =2.5> 
 
 <！ - 所有Servlet共享的Root Spring容器的定义
和Filters  - > 
< context-param> 
< param-name> contextConfigLocation< / param-name> 
< param-value> /WEB-INF/spring/servlet-context.xml< / param-value> 
< / context-param> 
 
< listener> 
< listener-class> org.springframework.web.context.ContextLoaderListener< / listener-class> 
< / listener> 
< servlet> 
< servlet-name> rest< / servlet-name> 
< servlet-class> org.springframework.web.servlet.DispatcherServlet< / servlet-class> 
<加载启动> 1< /加载启动> 
< / servlet> 
< servlet-mapping> 
< servlet-name> rest< / servlet-name> 
< url-pattern> / *< / url-pattern> 
< / servlet-mapping> 
 
< filter> 
< filter-name> simpleCORSFilter< / filter-name> 
< filter-class> org.lh.gestorepazienti.web.SimpleCORSFilter< / filter-class> 
< / filter> 
< filter-mapping> 
< filter-name> simpleCORSFilter< / filter-name> 
< servlet-name> rest< / servlet-name> 
< / filter-mapping> 
 
< filter> 
< filter-name> OpenSessionInViewFilter< / filter-name> 
< filter-class> org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter< / filter-class> 
< / filter> 
< filter-mapping> 
< filter-name> OpenSessionInViewFilter< / filter-name> 
< url-pattern> / *< / url-pattern> 
< / filter-mapping> 
< / web-app> 
  
哪里可能有错？ 
 
 servlet-context.xml 是不常见的 。当使用spring-mvc时，这个名字通常用于 DispatcherServlet 配置。你最好使用 applicationContext.xml 。
 
 
 
但是无论如何，你应该使用 DelegatingProxyFilter 允许正确初始化spring filter：
 < filter> 
< filter-name> simpleCORSFilter< / filter-name> 
< filter-class> org.springframework.web.filter.DelegatingFilterProxy< / filter-class> 
< / filter> 
  
  DelegatingProxyFilter 将在根上下文中搜索a名为 simpleCORSFilter 的bean，并将 doFilter 方法委托给它。
 
I added a CORS filter to my application, but it does not seem to be executed (no prints).

The filter is this:
@Component
public class SimpleCORSFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest req,
            HttpServletResponse res, FilterChain filterChain)
            throws ServletException, IOException {
        System.out.println("EXECUTING");
        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,Content-Type");

        filterChain.doFilter(req, res);
    }
}
Then I added the filter in the web.xml, which is the following:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">

    <!-- The definition of the Root Spring Container shared by all Servlets 
        and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/servlet-context.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet>
        <servlet-name>rest</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>rest</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>simpleCORSFilter</filter-name>
        <filter-class>org.lh.gestorepazienti.web.SimpleCORSFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>simpleCORSFilter</filter-name>
        <servlet-name>rest</servlet-name>
    </filter-mapping>

    <filter>
        <filter-name>OpenSessionInViewFilter</filter-name>
        <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>OpenSessionInViewFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>
Where could it be possibly wrong?
解决方案
First, it is uncommon to name the Root Spring Container xml file servlet-context.xml. This name is normally used for the DispatcherServlet configuration when using spring-mvc. You'd better use applicationContext.xml.

But anyway, you should use a DelegatingProxyFilter to allow proper initialization of the spring filter : 
<filter>
    <filter-name>simpleCORSFilter</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
The DelegatingProxyFilter will search in root context a bean named simpleCORSFilter and will delegate the doFilter method to it.

                        
这篇关于春天过滤器没有被调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！