JSP中调用JAVA类的问题 请帮忙。
<HTML>
<HEAD>
<meta http-equiv = "Content-Type" content = "text/html;charset = Shift_JIS">
<TITLE>test</TITLE>
</HEAD>
<BODY>
<%@ page language = "java" import = "com.west163.wlywest.test.JdbcCon" %>
<jsp: useBean id="Con" scope="application" class="JdbcCon" />
<%
JdbcCon Con = new JdbcCon();
java.sql.ResultSet RS = Con.ExcuteSQL("SELECT * FROM DEMO.CUSTOMER");
while (RS.next()){
out.print(RS.getString(1));
}
RS.close();
%>
</BODY>
</HTML>
以上是源程序,不过笨兔对以下存在疑问。
1。<%@ page language = "java" import = "com.west163.wlywest.test.JdbcCon" %>
2。<jsp: useBean id="Con" scope="application" class="JdbcCon" />
3。JdbcCon Con = new JdbcCon();
既然已经用第2句将JdbcCon 定义成 Con 为什么第3句是必需的,并且不依赖于第2句的定义。第2句是否没有作用,请大家指教。
谢谢