diff --git a/code/Dao.java b/code/Dao.java
deleted file mode 100644
index a1413ab..0000000
--- a/code/Dao.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package com.dao;
-import java.sql.*;
-import javax.sql.DataSource;
-import javax.naming.*;
-public interface Dao {
-    public static DataSource getDataSource(){
-	   DataSource dataSource = null;
-	   try {
-	      Context context = new InitialContext();
-	      dataSource = 
-            (DataSource)context.lookup("java:comp/env/jdbc/webstoreDS");
-	  }catch(NamingException ne){
-	     System.out.println("异常:"+ne);
-	  }
-	  return dataSource;
-	}
-    public default Connection getConnection() throws SQLException {
-	   DataSource dataSource = getDataSource();
-	   Connection conn = null;
-	   try{
-		   conn =  dataSource.getConnection(); 
-	   }catch(SQLException sqle){
-		   System.out.println("异常:"+sqle);  
-	   }
-	   return  conn;
-   }	
-}