servlet-api.jar and jsp-api.jar

Do not use do not need to configure the servlet servlet-api.jar and jsp-api.jar paths of these two packages , but the JSP into JAVA source which has import javax.servlet.http * package , jsp and servlet into the same package , why do you need to configure when compiling the package path servlet , jsp do not need .
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these two packages are each application server is a proprietary , Javax belong to third parties under the package , Sun only raised interface specification, all third-party application server vendor has its own implementation
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  //这是jsp页面转换成的servlet代码
  package org.apache.jsp;
  
  import javax.servlet.*;
  import javax.servlet.http.*;
  import javax.servlet.jsp.*;
  
  public final class index_jsp extends org.apache.jasper.runtime.HttpJspBase
      implements org.apache.jasper.runtime.JspSourceDependent {
  }
  

  //这是我自己写的servlet代码
  import java.io.*; 
  import java.sql.*; 
  import javax.servlet.*; 
  import javax.servlet.http.*; 
  
  public class ServletUser extends HttpServlet 
  { }
  
  

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upstairs conceptual interpretation of the interface was very good, master.
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unofficial [color = # FF0000] [/ color]