用init-param如何从web.xml中获得参数？

1.用init-param获取：

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>

更多请看：https://blog.csdn.net/qq_44594371/article/details/103157414