Filter 字符编码Filter 一

时间：2022-04-24 23:46:13

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

<filter>

        <filter-name>characterEncodingFilter</filter-name>

        <filter-class>

            com.helloweenvsfei.filter.CharacterEncodingFilter

        </filter-class>

        <init-param><!-- 编码方式 -->

            <param-name>characterEncoding</param-name>

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

        </init-param>

        <init-param><!-- 是否使用编码 -->

            <param-name>enable</param-name>

            <param-value>true</param-value>

        </init-param>

</filter>

<filter-mapping>

        <filter-name>characterEncodingFilter</filter-name>

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

</filter-mapping>

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

 <Connector port="8080" protocol="HTTP/1.1"

               connectionTimeout="20000"

               redirectPort="8443"  URIEncoding = "UTF-8"/>

基本所有的javaWeb程序都用该Filter。

附：characteEncoding.jsp验证编码器

 <%@ page language="java" contentType="text/html; charset=UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 <style>

 body, input, textarea {

     font-size: 12px;

 }

 textarea {

     width: 400px;

     height: 50px;

 }

 </style>

 </head>

 <body>

 <pre>

 <b>您输入了</b>：

 ${ param.text }

 </pre>

 <form action="${ param.request.requestURL }" method="post"><textarea

     name="text">${ param.text }</textarea> <br />

 <input type="submit"></form>

 </body>

 </html>

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