setcharacterfilet.java

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package org.chenhao.comm;

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 SetCharacterFilet implements Filter {
	protected String encoding = null;
	protected FilterConfig filterConfig = null;
	protected boolean ignore = true;
	
	
	
	
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;

	}
	protected String selectEncoding(ServletRequest request){

		 return (this.encoding);

		 }

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (ignore ||(request.getCharacterEncoding()== null))
		{
			 String encoding = selectEncoding(request);
			 if (encoding != null)
			 request.setCharacterEncoding(encoding);
			 }


			 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;
	}

}