privilegefilter.java

这是本人曾经在公司里用的,内部开发框架,基于struts+hibernate今天分享给大家

/**
 * 
 */
package cn.bway.struts.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;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import cn.bway.common.WebConstant;

/**
 * @author Kson
 *
 */
public class PrivilegeFilter implements Filter {

	private static Logger log = Logger.getLogger(PrivilegeFilter.class);
    private final static String FILTERERRORRETURNPAGE = "filter.error";
    private final static String FILTERERRORFINAL = "filter.finalError";
	private FilterConfig config = null;
	protected String encoding = null;
	protected boolean ignore = true;
	protected FilterConfig filterConfig = null;
	
	/* (non-Javadoc)
	 * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
	 */
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		config = arg0;
		
		this.encoding = arg0.getInitParameter("encoding");
		String value = arg0.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;
		}
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
	 */
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		// TODO Auto-generated method stub
		String resultValue = null;
        try {
        	String encoding = selectEncoding(arg0);
			if (encoding != null) {
				arg0.setCharacterEncoding(encoding);
			}
        	resultValue = UserPrivilege.judgePrivilege((HttpServletRequest)arg0);
        } catch (Exception e){
			// TODO Auto-generated catch block
	    	log.error(e.getMessage());
	          try{
	              resultValue = WebConstant.Filter;
	          }
	          catch(Exception ex){
	              resultValue = FILTERERRORFINAL;
	              arg0.setAttribute("error","filter key: " + FILTERERRORRETURNPAGE);
	              ex.printStackTrace();
	          }
        }
        if(resultValue == null){
            arg2.doFilter(arg0,arg1);
        }else{
        	log.info("\n  get the resultValue ==  " +resultValue +"\n");
        	arg0.getRequestDispatcher(resultValue).forward(arg0,arg1);          
        }
	}

	/* (non-Javadoc)
	 * @see javax.servlet.Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
		this.encoding = null;
		this.filterConfig = null;
		this.config=null;
	}
	
	protected String selectEncoding(ServletRequest request) {
		return (this.encoding);
	}

}