encodingfilter.java

精通tomcat书籍原代码,希望大家共同学习

package com.utils;

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



public class EncodingFilter extends HttpServlet implements Filter 
{
	//private FilterConfig config = null;
	private String encoding = "";
	
	public final static long serialVersionUID = 0;

	public void init(FilterConfig config) throws ServletException {
		//this.config = config;
		this.encoding = config.getInitParameter("encoding");

	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
		throws java.io.IOException, ServletException 
	{		
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse res = (HttpServletResponse)response;	
		response.setCharacterEncoding(this.encoding);
		
		java.io.PrintWriter out = res.getWriter();
		out.print("过滤器设置编码为："+this.encoding+"<br><br>");
		
		chain.doFilter(req, res);
	}
}