nametag.java

学生信息管理系统

package tagext;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import java.io.IOException;
import javax.servlet.http.HttpSession;

public class NameTag implements Tag
{
	private PageContext context=null;
	private Tag parent=null;
	private String userName=null;
	public void setPageContext(PageContext context)
	{
		this.context=context;
	}
	public void setParent(Tag parent)
	{
		this.parent=parent;
	}
	public void setUserName(String userName)
	{
		this.userName = userName;
	}
	public Tag getParent()
	{
		return this.parent;
	}
	public int doStartTag()throws JspException
	{
		
		JspWriter out=this.context.getOut();
		HttpSession session= this.context.getSession();
		String user=(String)session.getAttribute(userName);
		try
    	{
    		out.print(user);
    	
    	}
    	catch(IOException ioe)
    	{
    		ioe.printStackTrace();
    	}
    	return this.SKIP_BODY;
	}
	public int doEndTag()throws JspException
	{
		return this.EVAL_PAGE;
	}
	public void release()
	{
		this.context=null;
		this.parent=null;
	}
}