字符编码过滤器，，，帮您解决乱码问题

在开发过程中难免会遇到乱码问题，很早以前就写了这个处理乱码的过滤器，拿出来透透气下，也让路过的朋友们呼吸呼吸...

package com.web0248.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 SetCharacterEncodingFilter implements Filter {

       protected String encoding = null;


       protected FilterConfig filterConfig = null;


       protected boolean ignore = true;


       public void destroy() {

              this.encoding = null;

              this.filterConfig = null;

       }


       public void doFilter(ServletRequest request, ServletResponse response,

                     FilterChain chain) throws IOException, ServletException {


              // 有条件地选择设置字符编码使用

              if (ignore || (request.getCharacterEncoding() == null)) {

                     String encoding = this.encoding;

                     if (encoding != null)

                            request.setCharacterEncoding(encoding);

              }


              chain.doFilter(request, response);


       }


       public void init(FilterConfig filterConfig) throws ServletException {


              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;


       }


}

web.xml配置：

<filter>

    <filter-name>SetCharacterEncodingFilter</filter-name>

    <filter-class>com.web0248.filter.SetCharacterEncodingFilter</filter-class>

    

    <init-param>

   <!-- 定义编码格式，我用的是utf-8 -->

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

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

    </init-param>

    

    <init-param>

    <!-- ignore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>SetCharacterEncodingFilter</filter-name>

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

</filter-mapping>

<filter-mapping>

    <filter-name>SetCharacterEncodingFilter</filter-name>

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

</filter-mapping>