ServletConfig对象

最新推荐文章于 2023-09-04 15:01:12 发布

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本文介绍了一个具体的Web.xml配置示例，展示了如何通过该文件为Servlet配置初始化参数，包括数据库连接信息、字符集设置等，并提供了相应的Servlet代码实现来读取这些配置。

Web.xml配置文件：

<servlet>
    <servlet-name>ServletDemo5</servlet-name>
    <servlet-class>cn.itcast.ServletDemo5</servlet-class>
  	<init-param>
  		<param-name>data1</param-name>
  		<param-value>xxxxx</param-value>
  	</init-param>
  	<init-param>
  		<param-name>data2</param-name>
  		<param-value>yyyyy</param-value>
  	</init-param>
  	<init-param>
  		<param-name>data3</param-name>
  		<param-value>zzzzz</param-value>
  	</init-param>
  	
  	<init-param>
  		<param-name>charset</param-name>
  		<param-value>UTF-8</param-value>
  	</init-param>
  	
  	<init-param>
  		<param-name>url</param-name>
  		<param-value>jdbc:mysql://localhost:3306/test</param-value>
  	</init-param>
  	<init-param>
  		<param-name>username</param-name>
  		<param-value>root</param-value>
  	</init-param>
  	<init-param>
  		<param-name>password</param-name>
  		<param-value>root</param-value>
  	</init-param>
  	
  	<init-param>
  		<param-name>config</param-name>
  		<param-value>/struts-config.xml</param-value>
  	</init-param>
  </servlet>

Servlet代码：

//servletConfig对象，用于封装servlet配置信息
//在实际开发中，有一些东西不适合在servlet程序中写死，这类数据就可以通过配置方式配给servlet，例如
//servlet采用哪个码表，servlet连接哪个数据库，servlet采用哪个配置文件
public class ServletDemo5 extends HttpServlet {
	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		//得到指定的参数
		String value = this.getServletConfig().getInitParameter("data1");
		System.out.println(value);
		
		//得到所有的参数
		Enumeration e = this.getServletConfig().getInitParameterNames();
		while(e.hasMoreElements()){
			String name = (String)e.nextElement();
			String value1 = this.getServletConfig().getInitParameter(name);
			System.out.println(name+"="+value1);
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

}