前端显示汉字乱码

前端显示乱码问题的解决方法，两种方案：自定义过滤器；使用springmvc给的过滤器

自定义过滤器

package com.zkw.filter;

import javax.servlet.*;
import java.io.IOException;

public class EncodingFilter implements Filter {
   
   
    public void init(FilterConfig filterConfig) throws ServletException {
   
   

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
   
   
        servletRequest.setCharacterEncoding("UTF-8");
        servletResponse.setCharacterEncoding("UTF-8");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    public void destroy() {
   
   

    }
}

配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi