more details, see https://link.vuejs.org/feature-flags.

initFeatureFlags @ runtime-core.esm-bundler.js:4607

baseCreateRenderer @ runtime-core.esm-bundler.js:4624

createRenderer @ runtime-core.esm-bundler.js:4617

ensureRenderer @ runtime-dom.esm-bundler.js:1737

createApp @ runtime-dom.esm-bundler.js:1751

eval @ main.js:11

./src/main.js @ app.js:19

__webpack_require__ @ app.js:243

(匿名) @ app.js:1414

__webpack_require__.O @ app.js:285

(匿名) @ app.js:1415

(匿名) @ app.js:1417

input.vue:531  [Vue warn]: Vue received a Component that was made a reactive object. This can lead to unnecessary performance overhead and should be avoided by marking the component with `markRaw` or using `shallowRef` instead of `ref`. 

Component that was made reactive:  {name: 'User', __name: 'user', setup: ƒ} 

  at <ElIcon key=0 class="el-input__icon" > 

  at <ElInput modelValue="" onUpdate:modelValue=fn placeholder="输入账户"  ... > 

  at <ElFormItem label="账户" > 

  at <ElForm model= {username: '', password: ''} label-width="auto" style= {max-width: '600px'} > 

  at <Login onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< undefined > > 

  at <RouterView> 

  at <Application>

warn$1 @ runtime-core.esm-bundler.js:51

_createVNode @ runtime-core.esm-bundler.js:7531

createVNodeWithArgsTransform @ runtime-core.esm-bundler.js:7415

createBlock @ runtime-core.esm-bundler.js:7385

eval @ input.vue:531

renderFnWithContext @ runtime-core.esm-bundler.js:692

renderSlot @ runtime-core.esm-bundler.js:2981

eval @ icon.vue:28

renderComponentRoot @ runtime-core.esm-bundler.js:6501

componentUpdateFn @ runtime-core.esm-bundler.js:5319

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

componentUpdateFn @ runtime-core.esm-bundler.js:5406

run @ reactivity.esm-bundler.js:225

runIfDirty @ reactivity.esm-bundler.js:263

callWithErrorHandling @ runtime-core.esm-bundler.js:199

flushJobs @ runtime-core.esm-bundler.js:408

Promise.then

queueFlush @ runtime-core.esm-bundler.js:322

queueJob @ runtime-core.esm-bundler.js:317

effect.scheduler @ runtime-core.esm-bundler.js:5448

trigger @ reactivity.esm-bundler.js:253

endBatch @ reactivity.esm-bundler.js:311

notify @ reactivity.esm-bundler.js:597

trigger @ reactivity.esm-bundler.js:571

set value @ reactivity.esm-bundler.js:1448

finalizeNavigation @ vue-router.mjs:3478

eval @ vue-router.mjs:3343

Promise.then

pushWithRedirect @ vue-router.mjs:3309

push @ vue-router.mjs:3235

install @ vue-router.mjs:3677

use @ runtime-core.esm-bundler.js:3863

eval @ main.js:14

./src/main.js @ app.js:19

__webpack_require__ @ app.js:243

(匿名) @ app.js:1414

__webpack_require__.O @ app.js:285

(匿名) @ app.js:1415

(匿名) @ app.js:1417

input.vue:531  [Vue warn]: Vue received a Component that was made a reactive object. This can lead to unnecessary performance overhead and should be avoided by marking the component with `markRaw` or using `shallowRef` instead of `ref`. 

Component that was made reactive:  {name: 'Edit', __name: 'edit', setup: ƒ} 

  at <ElIcon key=0 class="el-input__icon" > 

  at <ElInput modelValue="" onUpdate:modelValue=fn placeholder="输入密码"  ... > 

  at <ElFormItem label="密码" > 

  at <ElForm model= {username: '', password: ''} label-width="auto" style= {max-width: '600px'} > 

  at <Login onVnodeUnmounted=fn<onVnodeUnmounted> ref=Ref< undefined > > 

  at <RouterView> 

  at <Application>

warn$1 @ runtime-core.esm-bundler.js:51

_createVNode @ runtime-core.esm-bundler.js:7531

createVNodeWithArgsTransform @ runtime-core.esm-bundler.js:7415

createBlock @ runtime-core.esm-bundler.js:7385

eval @ input.vue:531

renderFnWithContext @ runtime-core.esm-bundler.js:692

renderSlot @ runtime-core.esm-bundler.js:2981

eval @ icon.vue:28

renderComponentRoot @ runtime-core.esm-bundler.js:6501

componentUpdateFn @ runtime-core.esm-bundler.js:5319

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

mountElement @ runtime-core.esm-bundler.js:4855

processElement @ runtime-core.esm-bundler.js:4820

patch @ runtime-core.esm-bundler.js:4688

mountChildren @ runtime-core.esm-bundler.js:4932

processFragment @ runtime-core.esm-bundler.js:5112

patch @ runtime-core.esm-bundler.js:4674

componentUpdateFn @ runtime-core.esm-bundler.js:5326

run @ reactivity.esm-bundler.js:225

setupRenderEffect @ runtime-core.esm-bundler.js:5454

mountComponent @ runtime-core.esm-bundler.js:5229

processComponent @ runtime-core.esm-bundler.js:5182

patch @ runtime-core.esm-bundler.js:4700

componentUpdateFn @ runtime-core.esm-bundler.js:5406

run @ reactivity.esm-bundler.js:225

runIfDirty @ reactivity.esm-bundler.js:263

callWithErrorHandling @ runtime-core.esm-bundler.js:199

flushJobs @ runtime-core.esm-bundler.js:408

Promise.then

queueFlush @ runtime-core.esm-bundler.js:322

queueJob @ runtime-core.esm-bundler.js:317

effect.scheduler @ runtime-core.esm-bundler.js:5448

trigger @ reactivity.esm-bundler.js:253

endBatch @ reactivity.esm-bundler.js:311

notify @ reactivity.esm-bundler.js:597

trigger @ reactivity.esm-bundler.js:571

set value @ reactivity.esm-bundler.js:1448

finalizeNavigation @ vue-router.mjs:3478

eval @ vue-router.mjs:3343

Promise.then

pushWithRedirect @ vue-router.mjs:3309

push @ vue-router.mjs:3235

install @ vue-router.mjs:3677

use @ runtime-core.esm-bundler.js:3863

eval @ main.js:14

./src/main.js @ app.js:19

__webpack_require__ @ app.js:243

(匿名) @ app.js:1414

__webpack_require__.O @ app.js:285

(匿名) @ app.js:1415

(匿名) @ app.js:1417

content.js:202 

-----------
控制台警告报错,什么原因呢

老师，单表查询时创建的emp表插入的数据 资料里没有给，这个多表查询时创建的dept表需要插入的数据 资料里也没有。只能一个一个的敲里面啊。。。

为什么我运行是这样的

老师，你好。我按照要求设置，可以正常使用。就是重启后，ip又变为默认的了，必须得 执行一次 service network restart 命令，ip才能设置好。  请问，这是缺少什么设置吗？

这个哪里出错了，看不出来不知道怎么错了

package com.bjsxt;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ResourceBundle;

/**
 * jdbc工具类
 * @author Administrator
 *
 */
public class JdbcUtil2 {
	private static String driver;
	private static String jdbcUrl;
	private static String username;
	private static String userpassword;
	static{
		//读取Properties文件
		ResourceBundle bundle = ResourceBundle.getBundle("jdbc");
		driver = bundle.getString("driver");
		jdbcUrl= bundle.getString("jdbcUrl");
		username = bundle.getString("username");
		userpassword = bundle.getString("userpassword");
		try {
			Class.forName(driver);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}

	//获取Connection对象
	public static Connection getConnection(){
		Connection conn = null;
		try {
		 conn =	DriverManager.getConnection(jdbcUrl, username, userpassword);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return conn;
		
	}
	//关闭Statement
	public static void closeStatement(Statement state){
			try {
				if(state != null){
					state.close();
				}
			} catch (SQLException e) {
				e.printStackTrace();
			}
	}
	//关闭Connection
	public static void closeConnection(Connection conn){
		try {
			if(conn != null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	//關閉資源
	public static void closeResource(Statement state,Connection conn,ResultSet rs){
		closeStatement(state);
		closeConnection(conn);
		closeResultSet(rs);
	}
	//关闭ResultSet连接
	public static void closeResultSet(ResultSet rs){
		try {
			if(rs != null){
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

package com.bjsxt;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;



public class JdbcTest2 {
	//向Department表中添加一条数据
	public void insertDepartments(String department_name,int location_id) {
			Connection conn = null;
			Statement state = null;
		try {
			conn = JdbcUtil2.getConnection();
			String sql="insert into departments values(default,'"+department_name+"',"+location_id+")";
			state = conn.createStatement();
			int flag = state.executeUpdate(sql);
			System.out.println(flag);
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			JdbcUtil2.closeResource(state, conn,null);
			}
			
		}
	
	//更新departments表中的deoartment_id为5的数据，将部门名称修改为教学部，location_id修改为5
	public void updateDempartments(String department_name,int location_id,int department_id) {
		Connection conn = null;
		Statement state = null;
		try {
			conn = JdbcUtil2.getConnection();
			state = conn.createStatement();
			String sql = "update departments d set d.department_name = '"+department_name+"',d.location_id = "+location_id+" where d.department_id = "+department_id;
			int flag = state.executeUpdate(sql);
			System.out.println(flag);
		}catch(Exception e) {
			e.printStackTrace();
		}finally{
			JdbcUtil2.closeResource(state,conn,null);
		}
	}
	//查询Departments表中部门ID为6的部门信息
	public void selectDepartmentsById(int departmentId) {
		Connection conn = null;
		Statement state = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtil2.getConnection();
			state = conn.createStatement();
			String sql = "select * from departments d where d.department_id = "+departmentId;
			//执行查询返回结果
			rs=state.executeQuery(sql);
			while(rs.next()) {
				System.out.println(rs.getInt("department_id")+" "+rs.getString("department_name")+" "+rs.getInt(3));
			}
		}catch(Exception e) {
			e.printStackTrace();
		}finally {
			JdbcUtil2.closeResource(state,conn,rs);
		}
	}
	public static void main(String[] args) {
		JdbcTest2 test2 = new JdbcTest2();
		//test2.insertDepartments("教学部",9);
		//test2.updateDempartments("工程部",7,5);
		test2.selectDepartmentsById(6);

	}

}

麻烦老师帮忙看一下这个是什么问题

老师，本节中关于时间这个问题datetime.now

视频中这两块没加括号，老师也说不用加括号，但是我自己加了也能创建成功，不知道到此处底是什么规范？

完全没听懂啊，救救孩子吧，不知道例子举的啥意思。。。。。。。。。。。。。。

老师，我在使用Java api 创建连接Zookeeper时idea出现以下错误,在网上找了很多方法都无法解决，麻烦您帮我看一下，甚是感谢！

错误提示：

main方法所在类：

package com.zyt;

import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;

import java.io.IOException;

public class ZookeeperDemo implements Watcher {

    public static void main(String[] args) throws IOException {

        ZooKeeper zooKeeper = new ZooKeeper("192.168.242.128:2181,192.168.242.128:2182,192.168.242.128:2183",15000, new ZookeeperDemo());

        //zooKeeper.create("");
    }

    @Override
    public void process(WatchedEvent event) {

        if(event.getState() == Event.KeeperState.SyncConnected) {
            System.out.println("成功连接！");
        }
    }
}

pom.xml配置文件:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zyt</groupId>
    <artifactId>ZookeeperDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.6.0</version>
        </dependency>
    </dependencies>

</project>

setting.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?>


<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
 

   <!--1、配置本地仓库的标签-->
   <localRepository>I:\IntelliJ Idea\localRepository</localRepository>

  <pluginGroups>
   
  </pluginGroups>

  
  <proxies>
  
  </proxies>

  
  <servers>
   
      <!--2、配置私服中仓库的访问-->
      <server>
         <id>releases</id>
         <username>deployment</username>
         <password>deployment123</password>
      </server>
      <server>
         <id>snapshots</id>
         <username>deployment</username>
         <password>deployment123</password>
      </server>

  </servers>

 
  <mirrors>
    
      <!--如果不配置私服，镜像仓库的配置方式-->
      <!--<mirror>
      <id>nexus-aliyun</id>
      <name>Nexus aliyun</name>
      <mirrorOf>central</mirrorOf>
      <url>http://maven.aliyun.com/nexus/content/groups/public</url>
      </mirror>-->
  </mirrors>

  <profiles>
    
     <!--3、Maven中插件的配置-->
     <profile>
        <!--配置私服的相关属性-->
        <id>sxt</id>
        <activation>
           <activeByDefault>false </activeByDefault>
           <jdk>1.8</jdk>
        </activation>
        <repositories>
           <repository>
              <id>public</id>
              <!--配置私服中仓库组的地址-->
              <url>http://192.168.242.128:8081/nexus/content/groups/public/</url>
              <releases>
                 <enabled>true</enabled>
              </releases>
              <snapshots>
                 <enabled>true</enabled>
              </snapshots>
           </repository>
        </repositories>
        <pluginRepositories>
           <pluginRepository>
              <id>public</id>
              <url>http://192.168.242.128:8081/nexus/content/groups/public/</url>
              <releases>
                 <enabled>true</enabled>
              </releases>
              <snapshots>
                 <enabled>true</enabled>
              </snapshots>
           </pluginRepository>
        </pluginRepositories>
     </profile>
    
      <!--Maven工程中jdk版本的配置-->
      <profile>
         <id>jdk1.8</id>
         <activation>
            <activeByDefault>true</activeByDefault>
            <jdk>1.8</jdk>
         </activation>
         <properties>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
            <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
         </properties>
      </profile>

</profiles>

   <activeProfiles>
      <!--<activeProfile>jdk1.8</activeProfile>-->
      <activeProfile>sxt</activeProfile>
   </activeProfiles>
 
</settings>

项目目录截图：

这下面报的错，所以到底是安装成功了吗？

buildpath为啥和视频不一样？有影响吗？

1我的

2.视频的

我再进行打包的时候出现这个错误，百度看了也没有找到具体的方法，应该怎么办？？

'utf-8' codec can't decode byte 0x80 in position 6: invalid start byte

老师，您好，帮忙看一下，为何我使用assembly插件中的pom文件时，descriptor这个标签一直是红的，一直找不到，如下图所示：

老师，这个图片文件，用FileInputStream可以直接读取，为啥还要加上new File()这个？

老师，您好。系统变量也配了，重启cmd进行登录时 ，还是出现下列问题: