SSH框架，在项目启动的时候加载数据库信息_ssh项目启动自动加载数据-优快云博客

本文链接：https://blog.youkuaiyun.com/littlebirdofjava/article/details/45867505

该博客介绍了如何在SSH框架的项目启动时，通过监听器ApplicationListener加载数据库中的用户信息。当项目启动时，监听器从ApplicationContext获取userService，调用其getUsers()方法获取用户列表，并将用户信息存入ClientSessionManager。此外，展示了配置监听器的部分代码。

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1.启动类

package com.simpefect.listener;

import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.sun.corba.se.impl.encoding.OSFCodeSetRegistry.Entry ;
import com.test.entity.User;
import com.test.service.IUserService;

public class ApplicationListener implements ServletContextListener{

       public void contextDestroyed(ServletContextEvent sce) {
             // TODO Auto-generated method stub
            
      }

       public void contextInitialized(ServletContextEvent sce) {
             // TODO Auto-generated method stub
             try {
                  ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext());
                  Object obj = context.getBean( "userService" );
                  IUserService usi = (IUserService)obj ;
                  List<User> users = usi.getUsers();
                   if (users!= null&&users.size()>0){
                         for (User user:users){
                              ClientSessionManager. getInstance().getClientSessions().put(UUID. randomUUID().toString(), user);
                        }
                  }
                  Map<String,User> map = ClientSessionManager.getInstance().getClientSessions();
                   if (map!=null &&map.size()>0){
                         for (java.util.Map.Entry<String,User> entry:map.entrySet()){
                              User user= entry.getValue();
                              System. out .println(entry.getKey()+":" +user .toString());
                        }
                  }
            } catch (Exception e) {
                   // TODO: handle exception
                  e.printStackTrace();
            }
            
      }

}

2.配置

< listener>
             < listener-class> com.simpefect.listener.ApplicationListener </listener-class >
       </ listener>