JAVA EE之配置中文过滤器

谁践踏了优雅 2022-05-14 12:57 236阅读 0赞

## 一：编写过滤代码，如下 ##

package com.sm.global;
    
    
    import javax.servlet.*;
    import java.io.IOException;
    
    public class EncodingFilter implements Filter {
    //    1：默认编码
        private String encoding="UTF-8";
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    //       2:如果配置文件配置了编码格式，则赋值，没有的话，使用默认
            if (filterConfig.getInitParameter("ENCODING")!=null)
            encoding=filterConfig.getInitParameter("ENCODING");
    
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    //        3：请求和响应分别设置编码格式
            servletRequest.setCharacterEncoding(encoding);
            servletResponse.setCharacterEncoding(encoding);
    //        4：继续过滤下一个
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        @Override
        public void destroy() {
            encoding=null;
        }
    }

## 二：配置web.xml文件，如下 ##

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
             version="3.1">
    
    
      <filter>
        <filter-name>Encoding</filter-name>
        <filter-class>com.sm.global.EncodingFilter</filter-class>
        <init-param>
          <param-name>ENCODING</param-name>
          <param-value>UTF-8</param-value>
        </init-param>
      </filter>
    
      <filter-mapping>
        <filter-name>Encoding</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
    
    
    </web-app>