netbeans中不存在包javax.servlet [英] package javax.servlet does not exist in netbeans

问题描述

嗨 我正在netbeans中开发应用程序.
发生以下错误
程序包javax.servlet不存在"

这是代码

包子；

  import  java.sql.*;
导入 java.io. *;
导入 javax.servlet.ServletException; // 错误包javax .servlet不存在
导入 javax.servlet.http.HttpServlet; // 错误包javax.servlet不存在
导入 javax.servlet.http.HttpServletRequest; // 错误包javax.servlet不存在
导入 javax.servlet.http.HttpServletResponse; // 错误包javax.servlet不存在
导入 javax.servlet.http.HttpSession; // 错误包javax.servlet不存在


公共 类 addnewphonenumber 扩展 HttpServlet {// 错误找不到符号" 
  


字符串 na1;
 int  c;
    
     受保护的 无效 doPost(HttpServletRequest请求，HttpServletResponse响应)
            抛出 ServletException，IOException {
       
       response.setContentType(" );
       PrintWriter pout = response.getWriter();
       如果(request.getParameter(" )！=空)
      {
        尝试 {
            字符串 flag1 = " ;
              Dbload db = new Dbload();
       连接con = db.getConnection();
       
       ResultSet rs;
            PreparedStatement ps；
            字符串 mob = request.getParameter(" " );
            
            ps =(PreparedStatement)con.prepareStatement(" );
            ps.setString( 1 ，na1);
            rs = ps.executeQuery();
            如果(rs.next())
            c = rs.getInt( 1 );
            ps.close();
            ps = con.prepareStatement(" );
            ps.setInt( 1 ，c);
            ps.setString( 2 ，mob);
            ps.setString( 3 ，flag1);
            ps.executeUpdate();
           ps.close();
           con.close();
           response.sendRedirect(" );
        }
        捕获(SQLException e){
               response.sendRedirect(" )；
        }
     }
        
    }
        
    } 

请帮助我解决此错误.
谢谢....

解决方案

您需要将"Java-EE-Glassfish-V3"库添加到项目中.
这是在项目的属性中完成的(在项目上单击鼠标右键).

hi i am developing an application in netbeans.
in that following error occured
"package javax.servlet does not exist"

this is the code

package child;

import java.sql.*;
import java.io.*;
import javax.servlet.ServletException;//error package javax.servlet does not exist 
import javax.servlet.http.HttpServlet;//error package javax.servlet does not exist 
import javax.servlet.http.HttpServletRequest;//error package javax.servlet does not exist 
import javax.servlet.http.HttpServletResponse;//error package javax.servlet does not exist 
import javax.servlet.http.HttpSession;//error package javax.servlet does not exist 


public class addnewphonenumber extends HttpServlet {//error "cannot find symbol"
  


String na1;
int c;
    
     protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       
       response.setContentType("text/html");
       PrintWriter pout =response.getWriter();
       if(request.getParameter("oks") != null)
      {
        try{
            String flag1="no";
              Dbload db=new Dbload();
       Connection con=db.getConnection();
       
       ResultSet rs;
            PreparedStatement ps;
            String mob= request.getParameter("mobile");
            na1=request.getParameter("str");
            
            ps= (PreparedStatement) con.prepareStatement("select * from login where username=?");
            ps.setString(1,na1);
            rs=ps.executeQuery();
            if(rs.next())
            c=rs.getInt(1);
            ps.close();
            ps=con.prepareStatement("insert into mobnumbers(id,mob,flag) values(?,?,?);");
            ps.setInt(1,c);
            ps.setString(2,mob);
            ps.setString(3, flag1);
            ps.executeUpdate();
           ps.close();
           con.close();
           response.sendRedirect("blank.jsp");
        }
        catch(SQLException e){
               response.sendRedirect("addphone.jsp");
        }
     }
        
    }
        
    }

Please help me to solve this error.
Thank you....

解决方案

You need to add the "Java-EE-Glassfish-V3" library to the project.
That is done in the project''s properties (right click on project).

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