application. getInitParameter

jsp 从web.xml读取连接数据库的参数
如：
web.xml读取连接数据库的参数,实现代码。
jsp或servlet页面代码：


String driver = application. getInitParameter ("driver") ;
String url = application.getInitParameter("url");
String user = application.getInitParameter("user");
String pass = application.getInitParameter("pass");

web.xml需要读取的内容：


<context-param>
<param-name>driver</param-name>
<param-value>com.mysql.jdbc.Driver</param-value>
</context-param>
<context-param>
<param-name>url</param-name>
<param-value>jdbc:mysql://localhost:3306/j2ee</param-value>
</context-param>
<context-param>
<param-name>user</param-name>
<param-value>root</param-value>
</context-param>
<context-param>
<param-name>pass</param-name>
<param-value>32l47</param-value>
</context-param>
详细出处参考：http://www.jb51.net/article/18173.htm