displayuserinfotag.java

JavaWeb高级特性书中源代码

package org.it315;
import java.io.IOException;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class DisplayUserInfoTag extends TagSupport 
{
	public int doStartTag() throws JspException
	{
		HttpSession session = pageContext.getSession();
		String username = (String)session.getAttribute("user");
		if(username != null)
		{
			return EVAL_BODY_INCLUDE;
		}
		else
		{
			return SKIP_BODY;
		}
	}
}