setencodefilter.java

一个成熟的论坛

package com.singnet.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 SetEncodeFilter implements Filter {

	protected FilterConfig filterConfig = null;

	protected String defaultEncoding = null;

	/**//*
		 * (non-Javadoc)
		 * 
		 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
		 */
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		this.filterConfig = arg0;
		this.defaultEncoding = filterConfig.getInitParameter("defaultencoding");
	}

	/**//*
		 * (non-Javadoc)
		 * 
		 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest,
		 *      javax.servlet.ServletResponse, javax.servlet.FilterChain)
		 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		request.setCharacterEncoding(selectEncoding(request));
		chain.doFilter(request, response);
	}

	public void destroy() {

		this.defaultEncoding = null;
		this.filterConfig = null;
	}

	protected String selectEncoding(ServletRequest request) {

		return this.defaultEncoding;
	}

}