创建实现接口ServletContextListener的监听器ServerInitListener.java

User.ava

package Entity;

import java.util.ArrayList;

public class User {
    private String name;
    private int number;
    private char code;
    private String character;
    private String status;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }
    public char getCode() {
        return code;
    }
    public void setCode(char code) {
        this.code = code;
    }
    public String getCharacter() {
        return character;
    }
    public void setCharacter(String character) {
        this.character = character;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    ArrayList<User> UserList;
}

在这里面写。给你创建了个思路

//创建个类去实现ServletContextListener接口
public class MyServletContextListenerImpl implements ServletContextListener {
 //在 ServletContext 对象创建之后马上调用，做初始化
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("ServletContext 对象被创建了");
 ArrayList<User> UserList;=new  ArrayList<User>();
for(int i=0;i<5;i++){
   User u=new User();
UserList.add(u);
}
}
 
// 在 ServletContext 对象销毁之后调用
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.out.println("ServletContext 对象被销毁了");
}
}