encodingfilter.java

基于java开发的邮件系统

package com.xiaoer.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 EncodingFilter implements Filter {
 protected FilterConfig config;

 protected String Encoding = null;

 public void init(FilterConfig config) throws ServletException {
  System.out.println("过滤器正在加载.........");
  this.config = config;
  this.Encoding = config.getInitParameter("Encoding");

 }

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {

  if (request.getCharacterEncoding() == null) {
   if (Encoding != null) {
    request.setCharacterEncoding(Encoding);
    response.setCharacterEncoding(Encoding);
   }
  }
  chain.doFilter(request,response);
 }
 public void destroy() {  System.out.println("过滤器加载完毕.........");}
}