JSP 사용자 정의 탭에서 사용자 IP 주소를 가져오는 방법

 
  
package cn.itcast.web.tag; 
   
  
import java.io.IOException;
 
  
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
 
  
public class ViewIPTag implements Tag {
 
  
    private PageContext pageContext;

    public int doStartTag() throws JspException {

        HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();//    Servlet  request  out   
        JspWriter out = pageContext.getOut();

        String ip = request.getRemoteAddr(); //    IP  
        try {
            out.write(ip);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return 0;
    }

    public int doEndTag() throws JspException {
        return 0;
    }
    public Tag getParent() {
        return null;
    }
    public void release() {
    }
    public void setPageContext(PageContext arg0) {
        this.pageContext = arg0;//PageContext    request out    
    }
    public void setParent(Tag arg0) {
    }
}
 
 

 
  
 
   
  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">

    A tag library exercising SimpleTag handlers.
    1.0
    SimpleTagLibrary
    /itcast

    
    
        viewIP  
        cn.itcast.web.tag.ViewIPTag
        empty
    

 
 

 
  
 
  
 
   
  



  

    
  

  
       IP ：