<!-- action的內容是url-pattern -->
<init-param>元素用於定義servlet中需要初始化的參數例如
<param-name>driver</param-name>
<param-value>oracle.jdbc.driver.OracleDriver</param-value>
</init-param>
<init-param>
<param-name>conn</param-name>
<param-value>
jdbc:oracle:thin:@127.0.0.1:1521:oracle
</param-value>
</init-param>
<init-param>
<param-name>user</param-name>
<param-value>scott</param-value>
</init-param>
<init-param>
<param-name>password</param-name>
<param-value>tiger</param-value>
</init-param>
--------------------------從上面獲取
public void init() throws ServletException {
String dbdriver = config.getInitParameter("driver");
String dburl = config.getInitParameter("conn");
String user = config.getInitParameter("user");
String password = config.getInitParameter("password");
}
<context-param>元素
上面的<init-param>元素定義的參數只能在當前的servlet中獲取,而其他的servlet
和資源卻無法獲取。而<context-param>元素可以在整個web應用中都可以獲取的參數
public String getInitParameter(String name);
Public java.util.Enumeration getInitParameterNames();
例如;<context-param>
<param-name>configLocation</param-name>
<param-value>/WEB-INF/myAppConfig.xml</param-value>
</context-param>
整個參數表明了一個配置文件的所在路徑,在任意的servlet代碼中可以使用如下方式獲取其
值:String configLocation =
getServletContext().getInitParameter("configLocation");
web服務器可以自動識別war文件