Filter 字符编码Filter 一-白红宇

Filter 字符编码Filter 一

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发布时间：2019-06-14

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使用字符编码Filter

package com.helloweenvsfei.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;public class CharacterEncodingFilter implements Filter {    private String characterEncoding;    private boolean enabled;    @Override    public void init(FilterConfig config) throws ServletException {        characterEncoding = config.getInitParameter("characterEncoding");        enabled = "true".equalsIgnoreCase(characterEncoding.trim())                || "1".equalsIgnoreCase(characterEncoding.trim());    }    @Override    public void doFilter(ServletRequest request, ServletResponse response,            FilterChain chain) throws IOException, ServletException {        if (enabled || characterEncoding != null) {            request.setCharacterEncoding(characterEncoding);            response.setCharacterEncoding(characterEncoding);        }        chain.doFilter(request, response);    }    @Override    public void destroy() {        characterEncoding = null;    }}

web.xml 配置如下


             
      
       characterEncodingFilter
              
      
                   com.helloweenvsfei.filter.CharacterEncodingFilter        
              
      
                   
       
        characterEncoding
                   
       
        UTF-8
               
              
      
                   
       
        enable
                   
       
        true
               
      
     
             
      
       characterEncodingFilter
              
      
       /*

注意：页面编码方式必须一致。另外如果使用GET表单提交。需要修改Tomcat /conf/server.xml 里的URIEncoding 修改代码如下

基本所有的javaWeb程序都用该Filter。

附：characteEncoding.jsp验证编码器

1 <%@ page language="java" contentType="text/html; charset=UTF-8"%> 2  3  4  5 
      6 Insert title here 7 16 17 18 19 您输入了：20 ${ param.text }21 
22 
     
      
       ${ param.text } 
       
24 
       25 26 27