encondingfilter.java

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package com.common.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 EncondingFilter implements Filter {
    private String enconding = null;
    private boolean isbegin = true;
    private FilterConfig filterConfig;
    
	public void destroy() {
		// TODO Auto-generated method stub
           this.enconding = null;
           this.filterConfig = null;
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		if(isbegin||arg0.getCharacterEncoding()==null){
			if(this.enconding!=null){
			arg0.setCharacterEncoding(this.enconding);
			}
		}
        arg2.doFilter(arg0, arg1);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.enconding = filterConfig.getInitParameter("enconding");
		if(enconding==null){
			enconding = "UTF-8";
		}
		String isBeginValue = filterConfig.getInitParameter("isBegin");
		if(isBeginValue==null){
			this.isbegin = true;
		}else if(isBeginValue.equals("true")){
			this.isbegin = true;
		}else{
			this.isbegin = false;
		}
		if(isbegin==true){
			System.out.println("encondingfilter is begin");
		}

	}

}