encodingfilter.java

一个小型的购物商店

/*
 * EncodingFilter.java
 *
 * Created on 2006年9月17日, 上午9:11
 */

package com.shopping.filter;

import java.io.*;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 *
 * @author  曹昊
 * @version
 */

public class EncodingFilter implements Filter {
    
    private FilterConfig filterConfig = null;
    private String encoding;
    private static final String DEFAULT_ENCODING = "gb2312";
    
    public void init(FilterConfig filterConfig) throws ServletException{
        this.filterConfig = filterConfig;
        encoding = filterConfig.getInitParameter("encoding");
        if (encoding == null) {
            encoding = DEFAULT_ENCODING;
        }
    }
    
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain){
       try {
           request.setCharacterEncoding(encoding);
           response.setCharacterEncoding(encoding);
           chain.doFilter(request,response);
       } catch(ServletException sx){
           filterConfig.getServletContext().log(sx.getMessage());
       } catch(IOException iox){
           filterConfig.getServletContext().log(iox.getMessage());
       }
    }
    
    public void destroy() {
    }
    
}