乱码的处理方式：
1.数据库本身是否支持utf-8。即 数据库创建的时候，字符集是否选择了utf-8。
2.数据库链接（URL）是否加上了characterEncoding=GBK
3.页面上是否是utf-8的编码格式（共有三处）
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
4.struts.xml进行国际化配置
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""/dtds/struts-2.3.dtd"><struts><constant name="struts.enable.DynamicMethodInvocation" value="false" /><constant name="struts.devMode" value="true" /><!-- 国际化配置 --><constant name="struts.i18n.encoding" value="UTF-8"></constant><package name="default" namespace="/" extends="struts-default">
5.使用过滤器，加上request.setCharacterEncoding,response.setCharacterEncoding
package maya.util;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.annotation.WebFilter;/*** Servlet Filter implementation class CharacterEncoding*/@WebFilter("/CharacterEncoding")public class CharacterEncoding implements Filter {/*** Default constructor. */public CharacterEncoding() {// TODO Auto-generated constructor stub }/*** @see Filter#destroy()*/public void destroy() {// TODO Auto-generated method stub }/*** @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)*/public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {//utf-8request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");chain.doFilter(request, response);}/*** @see Filter#init(FilterConfig)*/public void init(FilterConfig fConfig) throws ServletException {// TODO Auto-generated method stub }}
web.xml配置
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="/2001/XMLSchema-instance" xmlns="/xml/ns/j2ee" xmlns:web="/xml/ns/javaee" xsi:schemaLocation="/xml/ns/j2ee /xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_9" version="2.4"><display-name>Struts Blank</display-name><filter><filter-name>encoding</filter-name><!-- 过滤器别称，自定义 --><filter-class>maya.util.CharacterEncoding</filter-class><!--指向过滤器的路径+类名--></filter><filter-mapping><filter-name>encoding</filter-name><url-pattern>/*</url-pattern><!-- 过滤所有页面 --></filter-mapping>
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