使用filter统一设置编码

时间：2023-03-08 22:06:19

1.写一个类EncodingFilter.java,实现javax.servlet.Filter(文件命名做到见名知意)

package com.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class EncodingFilter implements Filter {

    private String encoding = null;

    /**

     * 初始化方法,从web.xml中获取配置的初始化参数

     */

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        this.encoding = filterConfig.getInitParameter("encode");

    }

    /**

     * 设置编码

     */

    @Override

    public void doFilter(ServletRequest request, ServletResponse response,

            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest)request;

        HttpServletResponse httpResponse = (HttpServletResponse)response;

        httpRequest.setCharacterEncoding(encoding);

        httpResponse.setCharacterEncoding(encoding);

        //调用doFIlter方法,如果还有别的过滤器会自动向下调用

        chain.doFilter(httpRequest, httpResponse);

    }

    @Override

    public void destroy() {

    }

}

2.配置web.xml,使自定义的过滤器生效(如果有其他的过滤器,请放到最前面)

 <filter>

     <filter-name>encode</filter-name>

     <filter-class>com.filter.EncodingFilter</filter-class>

     <init-param>

         <param-name>encode</param-name>

         <param-value>UTF-8</param-value>

     </init-param>

 </filter>

 <filter-mapping>

     <filter-name>encode</filter-name>

     <url-pattern>/*</url-pattern>

 </filter-mapping>

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