Struts乱码的解决办法

做项目时遇到编码问题，这种情况当页面是用struts标签时产生的，主要表现为文本框输入中文是变成乱码，用html标签却没有碰到过，烦恼了几天，在网上找了一些资料，本人整理了一下，问题终于解决了，数据插入数据库(MS SQL Server)后中文也正常显示，在这里我要感谢各位网友！

我的解决步骤如下：

1.写一个过滤器，完整代码如下：

package com.jesun.character.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;

/**

* @author Jesun

* @date 2008-2-16

* 源码来自Internet,我只作了简单的修改

* 解决Struts中文显示乱码问题

* */

public class SetCharacterEncodingFilter implements Filter {

protected String encoding = null;

protected FilterConfig filterConfig = null;

protected boolean ignore = true; //在web.xml文件里定义filter时要用到此参数

public void destroy() {

   // TODO Auto-generated method stub

         this.encoding = null;

           this.filterConfig = null;

}

public void doFilter(ServletRequest request, ServletResponse response,

    FilterChain chain) throws IOException, ServletException {

   // TODO Auto-generated method stub

     // 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 {

   // TODO Auto-generated method stub

   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);

    }

}

//class end

(注：假如我们是用tomcat作服务器的话，那就更方便了，我们可以直接在tomcat的webapps\jsp-examples\Web-INF\classes\filters目录中的两个源文件RequestDumperFilter.java，SetCharacterEncodingFilter.java复制到你使用的包下。)

2.写好这个类以后，我们就在WEB应用的web.xml文件里定义Filter类，完整web.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<!-- 定义Filter，解决struts中文问题 -->

<filter>

    <filter-name>Set Character Encoding</filter-name>

    <filter-class>com.jesun.character.Filter.SetCharacterEncodingFilter</filter-class>//包名

    <init-param>

   <!-- 定义编码格式，我用的是GBK -->

      <param-name>encoding</param-name>

      <param-value>GBK</param-value>

    </init-param>

    <init-param>

    <!-- innore参数是在过滤器类定义的 -->

      <param-name>ignore</param-name>

      <param-value>true</param-value>

    </init-param>

</filter>

<filter-mapping>

    <filter-name>Set Character Encoding</filter-name>

    <servlet-name>action</servlet-name>

</filter-mapping>

<filter-mapping>

    <filter-name>Set Character Encoding</filter-name>

    <servlet-name>*.jsp</servlet-name>

</filter-mapping>

<!-- Filter 定义结束 -->

<servlet>

    <servlet-name>action</servlet-name>

    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

    <init-param>

      <param-name>config</param-name>

      <param-value>/WEB-INF/struts-config.xml</param-value>

    </init-param>

    <init-param>

      <param-name>debug</param-name>

      <param-value>3</param-value>

    </init-param>

    <init-param>

      <param-name>detail</param-name>

      <param-value>3</param-value>

    </init-param>

    <load-on-startup>0</load-on-startup>

</servlet>

<servlet-mapping>

    <servlet-name>action</servlet-name>

    <url-pattern>*.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<taglib>

     <taglib-uri>/WEB-INF/jesun.tld</taglib-uri>

    <taglib-location>/WEB-INF/jesun.tld</taglib-location>

</taglib>

</web-app>

(3)以后编写JSP文件时，记得加入下面两句：

<%@page contentType="text/html;charset=GBK"%>

<META http-equiv=Content-Type content="text/html;charset=GBK">

   到这里我们的工作就做完了，在程序里我们不需要再作任何其它处理，呵呵！