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【Java】包装类用到过滤其中

作者:feng123 / 发布于2013/2/1/ 489

package com.feng.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class OneFilter implements Filter {
 @Override
 public void init(FilterConfig filterConfig) throws ServletException {
  System.out.println("初始化。。。。。。。。。。1");
 }
  

 @Override
 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  System.out.println("过滤中。。。。。。。。。。。。。1");
  //只对post方法有效
  request.setCharacterEncoding("utf-8");
  response.setContentType("text/html;charset=utf-8");
  //如果是get方法
  MyRequest request2=new MyRequest((HttpServletRequest) request);
  chain.doFilter(request2, response);
//  chain.doFilter(request, response);
  System.out.println("返回中。。。。。。。。。。。。。1");
 }

 @Override
 public void destroy() {
  System.out.println("销毁。。。。。。。。。。1");
 }

}

 class MyRequest extends HttpServletRequestWrapper{
  private  HttpServletRequest request;
 public MyRequest(HttpServletRequest request) {
  super(request);
  this.request=request;
 }
 @Override
 public String getParameter(String name) {
   String val=request.getParameter(name);
  if(request.getMethod().equals("GET")){
   try {
    val=new String(val.getBytes("iso-8859-1"),"utf-8");
   } catch (UnsupportedEncodingException e) {
    e.printStackTrace();
   }
  }
  return val;
 }
 
 @Override
 public String[] getParameterValues(String name) {
  return super.getParameterValues(name);
 }
 
}

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