setcharacterencodingfilter.java

用SPRING做的一个企业信息系统网站

package com.enterpriseweb.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 SetCharacterEncodingFilter implements Filter {

	private FilterConfig filterConfig = null;
	private String encoding = null;
	private boolean flag = true;
	
	public void destroy() {
		// TODO Auto-generated method stub
		this.encoding = null;
		this.filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		if(flag || request.getCharacterEncoding()== null){
			String encoding = selectEncoding(request);
			if(encoding != null){
				request.setCharacterEncoding("encoding");
			}
		}
		chain.doFilter(request, response);
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		this.filterConfig = arg0;
		this.encoding = arg0.getInitParameter("encoding");
		String value = filterConfig.getInitParameter("flag");
		if(value == null){
			this.flag = true;
		}
		if(value.equalsIgnoreCase("true")){
			this.flag = true;
		}
		if(value.equalsIgnoreCase("yes")){
			this.flag = true;
		}
		if(value.equalsIgnoreCase("false")){
			this.flag = false;
		}
		if(value.equalsIgnoreCase("no")){
			this.flag = false;
		}
	}
	
	public String selectEncoding(ServletRequest request){
		return this.encoding;
	}

}