执行jsp文件：index.jsp
错误如下，读数据库是不是还要配web.xml 文件呀?怎么配呀？

javax.servlet.ServletException: Name gsSCYJZXWebDB is not bound in this Context
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
    org.apache.jsp.index_jsp._jspService(index_jsp.java:1239)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause 

javax.naming.NameNotFoundException: Name gsSCYJZXWebDB is not bound in this Context
    org.apache.naming.NamingContext.lookup(NamingContext.java:768)
    org.apache.naming.NamingContext.lookup(NamingContext.java:138)
    org.apache.naming.NamingContext.lookup(NamingContext.java:779)
    org.apache.naming.NamingContext.lookup(NamingContext.java:138)
    org.apache.naming.NamingContext.lookup(NamingContext.java:779)
    org.apache.naming.NamingContext.lookup(NamingContext.java:138)
    org.apache.naming.NamingContext.lookup(NamingContext.java:779)
    org.apache.naming.NamingContext.lookup(NamingContext.java:151)
    org.apache.naming.SelectorContext.lookup(SelectorContext.java:136)
    javax.naming.InitialContext.lookup(InitialContext.java:347)
    scyjzx.db.DBConn.getConnection(DBConn.java:18)
    scyjzx.sywh.SYWHContainer.getSYWHList(SYWHContainer.java:137)
    org.apache.jsp.index_jsp._jspService(index_jsp.java:74)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note