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Filter 字符编码Filter 一

2024-08-15 01:26:15   225人阅读

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

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"%> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <title>Insert title here</title> 7 <style> 8 body, input, textarea { 9     font-size: 12px; 10 }11 textarea {12     width: 400px; 13     height: 50px; 14 }15 </style>16 </head>17 <body>18 <pre>19 <b>您输入了</b>：20 ${ param.text }21 </pre>22 <form action="${ param.request.requestURL }" method="post"><textarea23     name="text">${ param.text }</textarea> <br />24 <input type="submit"></form>25 26 </body>27 </html>

 

Filter 字符编码Filter 一


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