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，在网上找了一些资料，整理了一下，问题解决，数据插入数据库(MS SQL Server)后中文也正常显示，

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！