loginchecktag.java

基于struts框架编写的在线考试系统

package examonline.taglibs;

import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import examonline.utils.*;



public class LoginCheckTag
    extends TagSupport {
  private String forward;
  private String type;
  public LoginCheckTag() {
  }

  /**
   *
   *
   * @return int
   * @throws JspException
   * @todo Implement this javax.servlet.jsp.tagext.Tag method
   */
  public int doEndTag() throws JspException {
    HttpSession session = pageContext.getSession();
    HttpServletRequest request =(HttpServletRequest)pageContext.getRequest();
    HttpServletResponse response =(HttpServletResponse)pageContext.getResponse();
    Object key=null;
    if("admin".equalsIgnoreCase(type))
      key = session.getAttribute(Constants.LOGIN_ADMIN_KEY);
    else if("student".equalsIgnoreCase(type))
      key= session.getAttribute(Constants.LOGIN_USER_KEY);
    if(key==null)
      try {
//        ActionErrors errors =new ActionErrors();
//        errors.add(ActionErrors.GLOBAL_ERROR,new ActionError("error.admin.notlogin"));
//        request.setAttribute(Globals.ERROR_KEY, errors);
        request.getRequestDispatcher(forward).forward(request, response);
        return this.SKIP_PAGE;
      }
      catch (Exception ex) {
        ex.printStackTrace();
    }
    return this.EVAL_PAGE;
  }

  /**
   * release
   *
   * @todo Implement this javax.servlet.jsp.tagext.Tag method
   */
  public void release() {
     forward=null;
     type=null;
  }


  public void setForward(String forward) {
    this.forward = forward;
  }

  public void setType(String type) {
    this.type = type;
  }

  public String getForward() {
    return forward;
  }

  public String getType() {
    return type;
  }

}