标记处理类.txt

来自「JSP课件以及一个网上书店系统程序,带数据库」· 文本 代码 · 共 60 行

package myTag;

import javax.servlet.jsp.tagext.TagSupport;

import javax.servlet.jsp.*;
import javax.servlet.ServletRequest;

import java.io.IOException;

public class getRequestParameter extends TagSupport{
    
public String name=" ";
    
public void setName(String name){
 
       this.name=name;
    }
    
public int doStartTag() throws JspException{
  
      ServletRequest request=pageContext.getRequest();
     
   String paramValue = request.getParameter(name);
    
    JspWriter out = pageContext.getOut();
      
  try{
         
   if(paramValue==null | paramValue.length()==0)
{

                out.print("cant get value");
 
           }
         
   out.print(paramValue);
       
 }catch(Exception e){
            throw new JspException(e);
        }
    
    return SKIP_BODY;
    
}
   
 public int doEndTag(){
  
      return EVAL_PAGE;
 
   }
    
public void release()
{
        
name="";
  
  }

}