1.用init-param获取：（视频下载） （全部书籍）
例：1.1.1
ServletHello1.java：
package com;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletHello1 extends HttpServlet {
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
String salary = getInitParameter("zhangsan");
System.out.println("salary is "+salary);
}
}
在web.xml中加入：
<servlet>
<servlet-name>ServletHello1</servlet-name>
<servlet-class>com.ServletHello1</servlet-class>
<init-param>
<param-name>zhangsan</param-name>
<param-value>1000</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>ServletHello1</servlet-name>
详情请见：http://www.mark-to-win.com/index.html?content=Jsp/jspUrl.html&chapter=Jsp/jsp2_web.html#GetParamWithinitparam
用init-param如何从web.xml中获得参数？
原文地址：https://www.cnblogs.com/mark-to-win/p/10114138.html