乱码问题 有兴趣的看看 估计大部分都不知道为什么

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 = null;



	protected FilterConfig filterConfig = null;



	public void destroy() {

		this.encoding = null;

		this.filterConfig = null;

	}



	public void doFilter(ServletRequest request, ServletResponse response,

			FilterChain chain) throws IOException, ServletException {

		String encoding = selectEncoding(request);

		// request.getParameter("");放到这儿也是乱码

		if (encoding != null) {

			request.setCharacterEncoding(encoding);

		}

		request.getParameter("");// 如果没有的话，则jsp页面提交到后台bean会是乱码

		chain.doFilter(request, response);

	}



	public void init(FilterConfig filterConfig) throws ServletException {

		this.filterConfig = filterConfig;

		this.encoding = filterConfig.getInitParameter("encoding");

	}



	protected String selectEncoding(ServletRequest request) {

		return (this.encoding);

	}

}