jsp write a bookstore source, a strict verification mechanism and database connections

app-src
.......\bookstore.html
.......\bookstore.jpx
.......\bookstore.jpx.local
.......\datetimeTag
.......\...........\taglibs-datetime.jar
.......\...........\taglibs-datetime.tld
.......\oraJdbcLib
.......\..........\classes12.jar
.......\Servlet.library
.......\src
.......\...\bookstore
.......\...\.........\DBConnection.java
.......\...\.........\servlet
.......\...\.........\.......\ExcelFileServlet.java
.......\...\.........\.......\LoginCheckFilter.java
.......\...\.........\.......\SrvStartListener.java
.......\...\.........\.......\UserCacheServlet.java
.......\...\.........\User.java
.......\...\.........\UserList.java
.......\webModule
.......\.........\error.jsp
.......\.........\fail.jsp
.......\.........\login.jsp
.......\.........\quit.jsp
.......\.........\sample.jsp
.......\.........\switch.jsp
.......\.........\WEB-INF
.......\.........\.......\classes
.......\.........\.......\.......\bookstore
.......\.........\.......\.......\.........\DBConnection.class
.......\.........\.......\.......\.........\servlet
.......\.........\.......\.......\.........\.......\ExcelFileServlet.class
.......\.........\.......\.......\.........\.......\LoginCheckFilter.class
.......\.........\.......\.......\.........\.......\SrvStartListener.class
.......\.........\.......\.......\.........\.......\UserCacheServlet.class
.......\.........\.......\.......\.........\User.class
.......\.........\.......\.......\.........\UserList.class
.......\.........\.......\lib
.......\.........\.......\...\classes12.jar
.......\.........\.......\...\taglibs-datetime.jar
.......\.........\.......\taglibs-datetime.tld
.......\.........\.......\web.xml
.......\.........\welcome.jsp

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