checklogontag.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * Created on 2004-4-1
 *
 */
package com.esimple.service.rbac.view.taglib;


import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import com.esimple.service.rbac.*;


/**
 * @author steven
 *
 */
public class CheckLogonTag extends TagSupport {

	private String name = User.SESSION_KEY;

	private String page = "/internet/reLogin.jsp";

	/**
	 * Return the forward page.
	 */
	public String getPage() {

	   return (this.page);

	}
	/**
	 * Set the forward page.
	 *
	 * @param page The new forward page
	 */
	public void setPage(String page) {

	   this.page = page;

	}

	public int doStartTag() throws JspException {
	   return (SKIP_BODY);
	}

	public int doEndTag() throws JspException {
    
		// Is there a valid user logged on?
		boolean valid = false;
		HttpSession session = pageContext.getSession();
		if ((session != null) && (session.getAttribute(name) != null)) {
			valid = true;
		}
    
		// Forward control based on the results
		if (valid) {
			return (EVAL_PAGE);
		} else {
			try {
				pageContext.forward( page );
			} catch (ServletException e) {
				throw new JspException(e.toString());
			} catch (IOException e) {
				throw new JspException(e.toString());
			}
			return (SKIP_PAGE);
		}
    
	}

	/**
	 * Release any acquired resources.
	 */
	public void release() {
		super.release();
		this.page = "/internet/reLogin.jsp";

	}


}