ServletConfig对象，用于封装Servlet的配置信息_config对象:封装了应用程序的配置信息。-优快云博客

本文链接：https://blog.youkuaiyun.com/u010078400/article/details/26564933

ServletConfig对象是Servlet中用于存储配置信息的关键组件。它从XML配置文件中获取Servlet的初始化参数，如Servlet名称、初始化参数等。通过ServletConfig，开发者可以在不修改Servlet代码的情况下，灵活地调整Servlet的行为。

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package ServletDome1;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class Deom1 extends HttpServlet
{
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{
		//得到指定的初始化参数:
		String value = this.getServletConfig().getInitParameter("data1");
		System.out.println(value);
		
		//得到所有的初始化参数:
		Enumeration enumeration = this.getServletConfig().getInitParameterNames();
		while(enumeration.hasMoreElements())
		{
			String name = (String) enumeration.nextElement();
			String val = this.getServletConfig().getInitParameter(name);
			System.out.println(name + " = " + val);
		}
	}

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

}

xml文件中的部分配置信息如下：

<servlet>
    <servlet-name>Deom1</servlet-name>
    <servlet-class>ServletDome1.Deom1</servlet-class>
	
	<init-param>
		<param-name>data1</param-name>
		<param-value>First</param-value>
	</init-param>
	
	<init-param>
		<param-name>data2</param-name>
		<param-value>Second</param-value>
	</init-param>
	
	<init-param>
		<param-name>data3</param-name>
		<param-value>Third</param-value>
	</init-param>
	
  </servlet>

<servlet-mapping>
    <servlet-name>Deom1</servlet-name>
    <url-pattern>/servlet/Deom1</url-pattern>
  </servlet-mapping>

运行结果如下：