package com.itheima.simple;

import java.io.IOException;

import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public class ShowRemoteIPSimpleTag extends SimpleTagSupport {

        public void doTag() throws JspException, IOException {
                PageContext  pc=(PageContext) getJspContext();
                String ip=pc.getRequest().getRemoteAddr();
                pc.getOut().write(ip);
        }

}

//获取context对象强转pageContext
PageContext  pc=(PageContext) getJspContext();

//获取request域对象
//--------------------这句什么意思-----getRemoteAddr------------
String ip=pc.getRequest().getRemoteAddr();

  pc.getOut().write(ip);