一个或多个筛选器启动失败 的问题探索以及解决方案

问题描述:

做一个字符编码过滤器.注册xml后,Tomcat启动web项目提示如下错误信息 :

org.apache.catalina.core.StandardContext.startInternal 一个或多个筛选器启动失败。

将web.xml 中的注册信息注释项目能正常运行,所以怀疑是过滤器的问题

CharacterEncodingFilter.java

package com.shme.filter;

import javax.servlet.*;
import java.io.IOException;
/**
 * @Desc 字符编码过滤器
 */
public class CharacterEncodingFilter implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("CharacterEncodingFilter过滤器初始化");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        //设置utf-8
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");

        chain.doFilter(request,response);
    }

    @Override
    public void destroy() {
        System.out.println("CharacterEncodingFilter过滤器销毁");
    }
}

web.xml (3.1版本)

<!--字符编码过滤器-->
    <filter>
        <filter-name>charset</filter-name>
        <filter-class>com.shme.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>charset</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>