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【Java入门】从零开始学Java：基础到实践

【企业实战】如何在项目中集成智能聊天机器人

【AI社交】在微信中接入DeepSeek打造AI女友

【大模型框架】LangChain 与基于RAG构建医疗问答系统

【AI助手与数据可视化】Assistants 与 Streamlit

【大模型本地部署与微调】训练属于你的Deepseek

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【图像绘图】走进Midjourney图像AI绘图世界

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毕设项目

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ROS2机器人开发

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百战万词考研英语

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截止目前，同学们一共提了 132600个问题

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<script>
  
    var string = 'xiaoMingTongXue';
    var str=string.lastIndexOf('i') ;
    document.write(str);
</script>

老师从末尾处往前数，i所占的位置不是6吗，怎么是5呢，这个末尾处指的是不是Ming呀

WEB前端全系列/第二阶段：JavaScript编程模块/字符串与数组 27316楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>我要成为像马斯克一样的人!</title>
</head>
<body>
    <script>
        function roll() {
        var docTitle=document.title;
        var titleArr=docTitle.split('');
        titleArr.push(titleArr.shift());
        var newTitle=titleArr.join('');
        document.title=newTitle;
    };
    setInterval ('roll()',500);
    
    </script>
</body>
</html>

WEB前端全系列/第二阶段：JavaScript编程模块/DOM模型 27317楼

老师，字节流是面向字节的，一个字节是8位，范围是0~255，那字节流是如何读取写入那些占两个字节的字符的（比如汉字）？

JAVA 全系列/第二阶段：JAVA 基础深化和提高/IO 流技术（旧） 27318楼

老师，这里使用BufferedInputStream和BufferedOutputStream定义的处理流，是不是与自定义byte[]数组缓冲区然后read(byte[] b)并不一样？

我的理解：

1）处理流仍然是一个字节一个字节从数据源中读取数据，只是将这些字节缓存在处理流定义的字节数组中，之后等满了以后（达到8192个字节）再读入到程序中；

2）而自定义的缓冲区是一次直接从数据源中读取多个字节（比如定义的1024个字节数组）到程序中。

处理小文件的时候，自定义的会不会效率更高一下？

处理大文件的时候使用那个更好一些？

两个结合在一块使用适用吗？（比如第二段代码中的适用）

第一段代码：

package cn.ljp;

import java.io.*;

public class TestBufferedInputStream02 {
    public static void main(String[] args) {
        // 1) 定义字节流和处理流
        InputStream fis = null;
        InputStream fib = null;
        OutputStream fos = null;
        OutputStream fob = null;
        try{
            fis = new FileInputStream("f:/a.png");
            fib = new BufferedInputStream(fis);
            fos = new FileOutputStream("f:/aa.png");
            fob = new BufferedOutputStream(fos);
            int emp = 0;
            long start = System.currentTimeMillis();
            while((emp = fib.read()) != -1){
                System.out.println(emp);
                fob.write(emp);
            }
            fob.flush();
            long stop = System.currentTimeMillis();
            System.out.println("花费时间" + (stop - start) + "毫秒");
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            try{
                if(fib != null)
                    fib.close();
                if(fis != null)
                    fis.close();
                if(fob != null)
                    fob.close();
                if(fos != null)
                    fos.close();
            }catch(Exception e){
                e.printStackTrace();
            }
        }
    }
}

第二段代码：

package cn.ljp;

import java.io.*;

public class TestBufferedInputStream {
    public static void main(String[] args) {
        // 1) 定义字节流和处理流
        InputStream fis = null;
        InputStream fib = null;
        OutputStream fos = null;
        OutputStream fob = null;
        try{
            fis = new FileInputStream("f:/a.png");
            fib = new BufferedInputStream(fis);
            fos = new FileOutputStream("f:/aa.png");
            fob = new BufferedOutputStream(fos);
            byte[] buff = new byte[1204];
            int emp = 0;
            long start = System.currentTimeMillis();
            while((emp = fib.read(buff)) != -1){
                System.out.println(emp);
                fob.write(buff,0,emp);
            }
            fob.flush();
            long stop = System.currentTimeMillis();
            System.out.println("花费时间" + (stop - start) + "毫秒");
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            try{
                if(fib != null)
                    fib.close();
                if(fis != null)
                    fis.close();
                if(fob != null)
                    fob.close();
                if(fos != null)
                    fos.close();
            }catch(Exception e){
                e.printStackTrace();
            }
        }

    }
}

JAVA 全系列/第二阶段：JAVA 基础深化和提高/IO 流技术（旧） 27319楼

为什么视频中可以通过，这行代码获得请求的uri，flag这个key从哪里来的？

String flag = req.getParameter("flag");

JAVA 全系列/第五阶段：JavaWeb开发/Web实战案例 27320楼

egoshop.zip

老师您看看这是什么问题啊

WEB前端全系列/第二十阶段：Vue2企业级项目（旧）/Ego商城高级Vue实战项目 27321楼

为啥我使用@PostMapping注解回报下面的错误，而使用@RequestMapping注解却不会

JAVA 全系列/第十一阶段：分布式RPC调用和分布式文件存储/Swagger 27322楼

内置函数和调用函数的区别？

例：

a = [12,43,2,34]
a.sort()#对列表原地修改，不改变
a = sorted(a)#对原列表进行修改，建立新的列表

为什么？

麻烦老师解答一下

Python 全系列/第一阶段：Python入门/序列 27323楼

老师，mysql是表名大小写不敏感，不管写大小写都是小写，列名大小写敏感吗

JAVA 全系列/第三阶段：数据库编程/MySQL数据库 27324楼

这个报错的怎么不一样啊，什么原因导致的，看不懂

JAVA 全系列/第一阶段：JAVA 快速入门/变量、数据类型、运算符 27325楼

老师我这里怎么出不来 username password的对象啊

WEB前端全系列/第二十阶段：Vue2企业级项目（旧）/Ego商城高级Vue实战项目 27326楼

<style lang="scss">
page{
    .cate-section{
	position:relative;
	z-index:5;
	border-radius:16upx 16upx 0 0;
	margin-top:-20upx;
    }
}

.cate-section {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap:wrap;
    padding: 30upx 22upx; 
    background: #fff;
    }
</style>

这种写法中的 page 的作用是什么？为什么这么写？这个百度没有找到对应的解释

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5新增元素 27327楼

现在启动AdminServiceApplication时提示如下错误.

这个ossClient我看了很多地方都没有说是什么问题或者如何修改依赖。

另外后面的jetCache也不清楚是发生了什么问题。。。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ossClient' defined in class path resource [com/alibaba/alicloud/context/oss/OssContextAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.aliyun.oss.OSS]: Factory method 'ossClient' threw exception; nested exception is java.lang.IllegalArgumentException: Oss endpoint can't be empty.

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:656) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:636) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:895) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at com.bjsxt.AdminServiceApplication.main(AdminServiceApplication.java:20) [classes/:na]

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.aliyun.oss.OSS]: Factory method 'ossClient' threw exception; nested exception is java.lang.IllegalArgumentException: Oss endpoint can't be empty.

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:651) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

... 20 common frames omitted

Caused by: java.lang.IllegalArgumentException: Oss endpoint can't be empty.

at org.springframework.util.Assert.isTrue(Assert.java:118) ~[spring-core-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at com.alibaba.alicloud.context.oss.OssContextAutoConfiguration.ossClient(OssContextAutoConfiguration.java:53) ~[spring-cloud-alicloud-context-2.2.0.RELEASE.jar:2.2.0.RELEASE]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_211]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_211]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_211]

at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_211]

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

... 21 common frames omitted

2020-12-03 19:16:31.135 WARN 67165 --- [ main] o.s.boot.SpringApplication : Unable to close ApplicationContext

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'applicationAvailability' defined in class path resource [org/springframework/boot/autoconfigure/availability/ApplicationAvailabilityAutoConfiguration.class]: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.alicp.jetcache.anno.config.JetCacheProxyConfiguration': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:512) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.event.AbstractApplicationEventMulticaster.retrieveApplicationListeners(AbstractApplicationEventMulticaster.java:245) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.event.AbstractApplicationEventMulticaster.getApplicationListeners(AbstractApplicationEventMulticaster.java:197) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:134) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:403) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:360) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.boot.availability.AvailabilityChangeEvent.publish(AvailabilityChangeEvent.java:81) ~[spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.availability.AvailabilityChangeEvent.publish(AvailabilityChangeEvent.java:67) ~[spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.doClose(ServletWebServerApplicationContext.java:167) ~[spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:978) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:814) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:325) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.0.RELEASE.jar:2.3.0.RELEASE]

at com.bjsxt.AdminServiceApplication.main(AdminServiceApplication.java:20) [classes/:na]

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.alicp.jetcache.anno.config.JetCacheProxyConfiguration': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:603) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:409) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:91) ~[spring-aop-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:109) ~[spring-aop-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:92) ~[spring-aop-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101) ~[spring-aop-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:251) ~[spring-aop-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1141) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1114) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:506) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

... 18 common frames omitted

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available

at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:814) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1282) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:276) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor.postProcessBeforeInitialization(ConfigurationClassPostProcessor.java:456) ~[spring-context-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1788) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.6.RELEASE.jar:5.2.6.RELEASE]

... 40 common frames omitted

JAVA 全系列/（隐藏）第二十三阶段：数字货币交易所项目/服务中台_后台管理系统的开发 27328楼

<script>
    //打印出1，1，2，3，5，8，13
    var num1=1;
    var num2=1;
    document.write(num1+"<br/>");
    document.write(num2+"<br/>");
    var i=0;
    while (i<5){
        //把num1的值先保存起来，如果不保存的话，就会每次都是和num1=1相加
        var temp=num1;
        //第二次的第一个值是第一次的第二个值  新的num1是上一次的num2
        num1=num2;
        //新的num2是上一次的(num1+temp)
        num2=temp+num2;
        document.write(num2+"<br/>");
        i++;
    }

</script>

老师我想着，把num1赋值给temp，到最后，不是也是num1=1和其他相加吗，老师，我不太懂while循环里面的

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 27329楼

老师，我这个练习题的11.9为啥显示不出结果呢？job_grades表也在啊

JAVA 全系列/第三阶段：数据库编程/SQL 语言 27330楼

同学您好