setcharacterencodingfilter.java

基于WEB的会议管理系统

package com.meet.struts.filter;
import javax.servlet.*;
import java.io.IOException;
public class SetCharacterEncodingFilter implements Filter {
	
	    protected String encoding = null;


	    protected FilterConfig filterConfig = null;


	    protected boolean ignore = true;


	    public void destroy() {

	        this.encoding = null;
	        this.filterConfig = null;

	    }


	    public void doFilter(ServletRequest request, ServletResponse response,
	                         FilterChain chain)
	    throws IOException, ServletException {

	        // Conditionally select and set the character encoding to be used
	        if (ignore || (request.getCharacterEncoding() == null)) {
	            String encoding = selectEncoding(request);
	            if (encoding != null)
	                request.setCharacterEncoding(encoding);
	        }

	    // Pass control on to the next filter
	        chain.doFilter(request, response);

	    }



	    public void init(FilterConfig filterConfig) throws ServletException {

	    this.filterConfig = filterConfig;
	        this.encoding = filterConfig.getInitParameter("encoding");
	        String value = filterConfig.getInitParameter("ignore");
	        if (value == null)
	            this.ignore = true;
	        else if (value.equalsIgnoreCase("true"))
	            this.ignore = true;
	        else if (value.equalsIgnoreCase("yes"))
	            this.ignore = true;
	        else
	            this.ignore = false;

	    }


	    protected String selectEncoding(ServletRequest request) {

	        return (this.encoding);

	    }

	}