JSP MySQL Tomcat Apache乱码解决一例

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> 　　本文以最常见的JSP MySQL Tomcat Apache乱码解决为例，望能为你的环境配置起到抛砖引玉之效！ 　　乱码问题已历来已久，在开源环境下，乱码问题更是令程序员措手不及。本人在Unix（Freebsd）下的一次乱码经历可谓经典，故撰以此文以滋效尤！ 　　我将本次所遇乱码归为三类： 　　１．页面字符乱码 　　２．记录显示乱码 　　３．request传递乱码 　　以下将对上述三类乱码进行解析： 一．页面字符乱码： 　　１．大小写不一致： org.apache.jasper.JasperException: /top.jsp(1,1) Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html;charset=gb2312, new: text/html;charset=GB2312) 　　２．间隔不一致： org.apache.jasper.JasperException: /top.jsp(1,1) Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html; charset=GB2312, new: text/html;charset=GB2312) ＊解决方案： 首先，在Apache中增加AddDefaultCharset GB2312或AddDefaultCharset GBK 其次，统一使用页面编码定义，如：，ＯＫ，果然是乱。那么，现在有两种解决方法。 ＊解决方案： 　　１．加上这条语句：request.setCharacterEncoding("gbk"); 在一／两页上可行，但此法也非权益之计。 　　２．注册SetCharacterEncodingFilter类： 　　首先，编写SetCharacterEncodingFilter.java文件，代码如下： package cn.com.jsp; 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.UnavailableException; public class SetCharacterEncodingFilter implements Filter { protected String encoding = null; protected FilterConfig filterConfig = null; protected boolean ignore = true; public void destroy() { this.encoding = null; this.filterConfig = null; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // Conditionally select and set the character encoding to be used if (ignore || (request.getCharacterEncoding() == null)) { String encoding = selectEncoding(request); if (encoding != null) { request.setCharacterEncoding(encoding); } } // Pass control on to the next filter chain.doFilter(request, response); } public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig; this.encoding = filterConfig.getInitParameter("encoding"); String value = filterConfig.getInitParameter("ignore"); if (value == null) { this.ignore = true; } else if (value.equalsIgnoreCase("true")) { this.ignore = true; } else if (value.equalsIgnoreCase("yes")) { this.ignore = true; } else { this.ignore = false; } } protected String selectEncoding(ServletRequest request) { return (this.encoding); } } 　　此文件为request过滤类，在全局编译前需进行注册。 　　注册文件为：