注意问题：在学习用selvert的过滤器filter处理中文乱码时，在filter配置初始化时用了utf-8处理中文乱码，而在提交的jsp页面中却用了gbk。虽然两种都可以出来中文乱码，但是却造成了处理乱码的格式不一致。所以编译出错。

解决方法：所有地方都用utf-8或gbk

复制代码 代码如下:

//过滤器类

CharactorFilter.jsp

package cn.com.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;

public class CharactorFilter implements Filter { //继承Filter类

//字符编码

String encoding=null;

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

if(encoding!=null){

//设置request字符编码

request.setCharacterEncoding(encoding);

//设置response字符编码

response.setContentType("text/html;charset="+encoding);

}

//传递给下一个过滤器

chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

//获取初始化参数

encoding=filterConfig.getInitParameter("encoding");

}

public void destroy() {

// TODO Auto-generated method stub

encoding=null;

}

}

web.xml

复制代码 代码如下:

<filter> <>

<filter-name>CharactorFilter</filter-name> <>

<filter-class>cn.com.Filter.CharactorFilter</filter-class> <>

<init-param> <>

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

<param-value>utf-8</param-value> <>

</init-param>

</filter>

<filter-mapping> <>

<filter-name>CharactorFilter</filter-name><>

<url-pattern>/*</url-pattern><>

</filter-mapping>