过滤器改变编码的实现

1、写好过滤器Java源文件文件（名称为：CharacterEncodingFilter）

package com.cky.firstStruts.common.CharacterEncodingFilter 

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;

/** 编码过滤器 */
public class CharacterEncodingFilter implements Filter {
 String encoding = null;
 FilterConfig filterConfig = null;

 /** 初始化方法 */
 public void init(FilterConfig filterConfig) throws ServletException {
  this.filterConfig = filterConfig;
  this.encoding = filterConfig.getInitParameter("encoding");
 }

 /** 处理过滤方法 */
 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain filterChain) throws IOException, ServletException {
  if(encoding != null){
   //对请求进行编码设置
   request.setCharacterEncoding(encoding);
  }
  //将处理权转交给下一个处理器
  filterChain.doFilter(request, response);
 }

 /** 销毁方法 */
 public void destroy() {
  this.encoding = null;
  this.filterConfig = null;
 }

}

 
过滤器文件就写好了，接下来就是配置了。

2、在XML配置

<!-- 配置过滤器 -->
 <filter>
  <filter-name>CharacterEncodingFilter</filter-name>
  <filter-class>com.cky.firstStruts.common.CharacterEncodingFilter</filter-class>
  <init-param>
   <param-name>encoding</param-name>
   <param-value>UTF-8</param-value>
  </init-param>
  <init-param>
   <param-name>ignore</param-name>
   <param-value>true</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>CharacterEncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

 最近记性很不好的.老是忘记东西,居然忘记过滤器要实现哪个类.看来不用真的很快忘记了!写一个记录一下.