JSP中，为何2个汉字或者4个汉字就不显示乱码，而3个汉字则第三个汉字为乱码？

JSP中，为何2个汉字或者4个汉字就不显示乱码，而3个汉字则第三个汉字为乱码？我用request获取参数，
为何造成这样的结果？我在头部是这样添加的：<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="com.microsoft.sqlserver.jdbc.*" %>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
这是怎么回事啊，乱码的事情一直没有解决

解决方案 »

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自己写一个过滤器: public class DoFilter implements Filter
{     public void destroy() {
    }     public void doFilter(ServletRequest arg0, ServletResponse arg1,
         FilterChain arg2) throws IOException, ServletException {
    arg1.setCharacterEncoding("GBK");
    arg2.doFilter(arg0, arg1);
} public void init(FilterConfig arg0) throws ServletException {
} } 在web。xml中配置： 
  <filter>
    <filter-name>encodingFilter </filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter </filter-class>
    <init-param>
        <param-name>encoding </param-name>
        <param-value>UTF-8 </param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding </param-name>
        <param-value>true </param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter </filter-name>
    <url-pattern>*.jsp </url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>encodingFilter </filter-name>
    <url-pattern>*.do </url-pattern>
  </filter-mapping>
LZ用的是MYECLIPSE？可能是因为MYECLIPSE设置的编码问题
查看下数据的编码格式
页面的编码格式
myEclipse工程的编码格式
tomcat的编码格式
最好将这四种统一起来，应该不会有错。
建议使用过滤器还有编码方式使用GBK
是conf里面的web.xml吗？
还是开始的那个方法放在那里？
在web。xml中配置： 
  <filter>
    <filter-name>encodingFilter </filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter </filter-class>
    <init-param>
        <param-name>encoding </param-name>
        <param-value>UTF-8 </param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding </param-name>
        <param-value>true </param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter </filter-name>
    <url-pattern>*.jsp </url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>encodingFilter </filter-name>
    <url-pattern>*.do </url-pattern>
  </filter-mapping>
webroot/web-info 文件夹下的web.xml 文件的配置.
把你的servlet代码贴出来看一下，
把charset=gb2312不就行了吗
<servlet>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_jsp</servlet-class>
    </servlet>    <servlet>
        <servlet-name>org.apache.jsp.index_005fbig5_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_005fbig5_jsp</servlet-class>
    </servlet>    <servlet>
        <servlet-name>org.apache.jsp.index_005fgb_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_005fgb_jsp</servlet-class>
    </servlet>    <servlet-mapping>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <url-pattern>/index.jsp</url-pattern>
    </servlet-mapping>    <servlet-mapping>
        <servlet-name>org.apache.jsp.index_005fbig5_jsp</servlet-name>
        <url-pattern>/index_big5.jsp</url-pattern>
    </servlet-mapping>    <servlet-mapping>
        <servlet-name>org.apache.jsp.index_005fgb_jsp</servlet-name>
        <url-pattern>/index_gb.jsp</url-pattern>
    </servlet-mapping>
你要搞清楚一个问题。如：JSP1 输入参数　JSP2接收，则这两个JPS都编码要一样。并且两个JSP中都放上这两行代码试试。<%
   request.setCharacterEncoding("utf-8");
   response.setCharacterEncoding("utf-8");
%>
如果你是从SERVLET到JSP，则你这个SERVLET中也要加 response.setCharacterEncoding("utf-8");