encodingfilter.java

本项目源码是一个真实的应用项目

package org.langsin.computer.util;

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 String encoding;
   protected boolean ignore;
   protected FilterConfig filterConfig;
	public void destroy() {
		// TODO Auto-generated method stub

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if(ignore||request.getCharacterEncoding()==null){
			String encoding=this.selectEncoding(request);
			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;
		}
	}
	public String selectEncoding(ServletRequest request){
		return this.encoding;
	}

}