ServletConfig的用法

创建一个 servlet类public class ServletConfigDemo extends HttpServlet {}在该servlet类里的init方法里写下下面的代码：

public void init(ServletConfig config) throws ServletException {
		//从servlet中获得初始化的参数值
//		String username=config.getInitParameter("username");
//		System.out.println(username);
		//获得所有的参数名
		Enumeration enums=config.getInitParameterNames();
		while(enums.hasMoreElements()){
			String name=(String)enums.nextElement();
			String value=config.getInitParameter(name);
			System.out.println(value);
		}
	}

web.xml文件配置：

<servlet>
    
    <servlet-name>ServletConfigDemo</servlet-name>
    <servlet-class>ServletConfigDemo</servlet-class>
    <!-- init方法的初始值 -->
    <init-param>
    	<param-name>username</param-name>
    	<param-value>123456</param-value>
    </init-param>
    <init-param>
    	<param-name>password</param-name>
    	<param-value>000000</param-value>
    	
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>ServletConfigDemo</servlet-name>
    <url-pattern>/servlet/ServletConfigDemo</url-pattern>
  </servlet-mapping>

输出结果如下：