有效沟通问答-【官方】百战程序员_IT在线教育培训机构

后来删掉auth=true，就可以运行成功。而且很奇怪的是，开启用户认证后不光test中的代码会提示错误，就算在mongdb控制台中已经可以验证通过后再操作几分钟之后，mongdb控制台也会提示unauthorize的错误，类似db.shutdownServer()也无法执行了。好奇怪，请问这个有什么解决方式吗？

org.springframework.data.mongodb.UncategorizedMongoDbException: Command failed with error 13 (Unauthorized): 'not authorized on livegoods to execute command { insert: "banner", ordered: true, $db: "livegoods" }' on server 192.168.86.147:27017. The full response is {"ok": 0.0, "errmsg": "not authorized on livegoods to execute command { insert: \"banner\", ordered: true, $db: \"livegoods\" }", "code": 13, "codeName": "Unauthorized"}; nested exception is com.mongodb.MongoCommandException: Command failed with error 13 (Unauthorized): 'not authorized on livegoods to execute command { insert: "banner", ordered: true, $db: "livegoods" }' on server 192.168.86.147:27017. The full response is {"ok": 0.0, "errmsg": "not authorized on livegoods to execute command { insert: \"banner\", ordered: true, $db: \"livegoods\" }", "code": 13, "codeName": "Unauthorized"}

at org.springframework.data.mongodb.core.MongoExceptionTranslator.translateExceptionIfPossible(MongoExceptionTranslator.java:138)

at org.springframework.data.mongodb.core.MongoTemplate.potentiallyConvertRuntimeException(MongoTemplate.java:2902)

at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:587)

at org.springframework.data.mongodb.core.MongoTemplate.insertDocumentList(MongoTemplate.java:1519)

at org.springframework.data.mongodb.core.MongoTemplate.doInsertBatch(MongoTemplate.java:1384)

at org.springframework.data.mongodb.core.MongoTemplate.insert(MongoTemplate.java:1308)

at com.livegoods.mongodb.TestDatas.insertBanners(TestDatas.java:51)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)

at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)

at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)

at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)

at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Caused by: com.mongodb.MongoCommandException: Command failed with error 13 (Unauthorized): 'not authorized on livegoods to execute command { insert: "banner", ordered: true, $db: "livegoods" }' on server 192.168.86.147:27017. The full response is {"ok": 0.0, "errmsg": "not authorized on livegoods to execute command { insert: \"banner\", ordered: true, $db: \"livegoods\" }", "code": 13, "codeName": "Unauthorized"}

at com.mongodb.internal.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:175)

at com.mongodb.internal.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:303)

at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:259)

at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:99)

at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:450)

at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:72)

at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:218)

at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:269)

at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:131)

at com.mongodb.operation.MixedBulkWriteOperation.executeCommand(MixedBulkWriteOperation.java:435)

at com.mongodb.operation.MixedBulkWriteOperation.executeBulkWriteBatch(MixedBulkWriteOperation.java:261)

at com.mongodb.operation.MixedBulkWriteOperation.access$700(MixedBulkWriteOperation.java:72)

at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:205)

at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:196)

at com.mongodb.operation.OperationHelper.withReleasableConnection(OperationHelper.java:501)

at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:196)

at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:71)

at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:206)

at com.mongodb.client.internal.MongoCollectionImpl.executeInsertMany(MongoCollectionImpl.java:524)

at com.mongodb.client.internal.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:508)

at com.mongodb.client.internal.MongoCollectionImpl.insertMany(MongoCollectionImpl.java:503)

at org.springframework.data.mongodb.core.MongoTemplate.lambda$insertDocumentList$17(MongoTemplate.java:1526)

at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:585)

... 34 more

JAVA 全系列/第二十二阶段：租房网（Spring Cloud最新架构）/Livegoods第一天 31741楼

代码如下：

a = 'yuhong'
b = 'woshi
'
c = a.join(b)
print(c)

运行输出结果不是‘woshiyuhong’，而是一串乱序的字符，请问这是怎么回事呢？

Python全系列/第一阶段：AI驱动的Python编程/编程基本概念 31742楼

代码如下：

a = 'yuhong'
b = 'woshi
'
c = a.join(b)
print(c)

运行输出结果不是‘woshiyuhong’，而是一串乱序的字符，请问这是怎么回事呢？

Python全系列/第一阶段：AI驱动的Python编程/编程基本概念 31743楼

老师，我之前下载过IDEA，但是现在提示我貌似是过期了，然后就退掉了。又没有IDEA的安装包啊？

JAVA 全系列/第六阶段：JavaWeb开发/Servlet技术详解（旧） 31744楼

老师，这个报错是为什么呢？我看教程里老师也是这么写的呀

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老师，我用的是火狐浏览器，我已经安装了selenium包，把火狐对应的driver也放到了Python环境中，可是却不能运行代码

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老师以下是我对异常机制的一点个人总结劳烦斧正一下：

一：异常机制：

在程序编写中，往往会出现一些异常错误，主要有-编译错误（编写代码时就能被编辑器软件提示）；运行时错误（编写时无异常在运行过程中出现的异常）异常机制主要针对于处理运行时异常RuntimeException

二：语法：try——catch——finally

2.1 try用于将可能出现异常的代码包裹起来用于及时将异常抛出

2.2 catch：捕获，用于根据try抛出的代码异常做出相应的解决办法，以维持程序不会应出现异常而中断

2.3 finally：将不论是否发生异常都必须要运行的代码放在里面，常见于io流的关闭--比如在拷贝文件时也许文件并不存在或空间不足这都是异常想要被处理但是光处理还不够还需要将流关闭，这时候就需要用到finally

2.4 注意：catch和finally不能单独使用，必须配合try一起使用；try可以有多个catch语句用于针对不同的异常做出不同的解决办法，但catch不能有多个try

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老师，这里用console.log和alert为什么显示不一样，用alert则提示框显示11 12 。

<script>
	var a=10;
	console.log(++a);
	console.log(a);
	alert(a++);
	alert(a);
	</script>

WEB前端全系列/第二阶段：JavaScript编程模块/运算符_数据类型和流程循环语句 31748楼

jdbc链接数据库出现问题：

1：代码

package sxt.com;

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

public class JdbcTest {

    //向departments表添加一条数据
    public void insertDepartments(String department_name){
        Connection conn = null;
        Statement state = null;

        //驱动注册
        try {
            Class.forName("com.mysql.jdbc.Driver");
            //创建链接
             conn =DriverManager.getConnection("jdbc:mysql://localhost:3306/sxt？characterEncoding=utf-8","root","root");
            //执行sql
            String sql = "insert into department values(default,‘研发部’)";
             state = conn.createStatement();
           int flag = state.executeUpdate(sql);
            System.out.println(flag);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if (state != null){
                try {
                    state.close();
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }
        if (conn != null){
            try {
                conn.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }

    }

    public static void main(String[] args) {
        JdbcTest test = new JdbcTest();
        test.insertDepartments("研发部");
    }
}

2：问题：

JAVA 全系列/第四阶段：数据库与AI协同技术实战/JDBC技术（旧） 31749楼

<html>

    <head>
        <meta charset = 'UTF-8' />

        <title>  这是我的第一个网页 <title/>
    </head>
    
    <body>
      
      This is my first HTML
    
    </body>

</html>

老师为什么照视频敲出的代码没有显示body中的内容，标题倒是显示了

Python全系列/第七阶段：网页编程基础/html5 31750楼

如何在maven中央仓库，查看starter所支持的springboot的版本？

JAVA 全系列/第九阶段：Spring Boot实战/Spring Boot 31751楼

在哪里能看到spring boot admin starter支持的对应springboot的版本，我在maven中央仓库没看到呀

JAVA 全系列/第九阶段：Spring Boot实战/Spring Boot 31752楼

新增大广告之后把redis中的大广告数据删掉也是一样的效果吧。。。

JAVA 全系列/第十八阶段：亿级高并发电商项目_架构/编码（旧）/电商：使用RabbitMQ实现大广告异步缓存 31753楼

老师，我这一输入javac HelloWorld.java就出现很多错误：非法字符

百度查了查，还是不知道怎么解决

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老师，我的mysql安装完后my.cnf文件里啥也没有，是啥原因呢呀

JAVA 全系列/第十三阶段：高性能数据处理、NoSQL、分库分表/MyCat 31755楼

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