1. spring boot 配置
2. spring boot 日志
3. spring boot 的 web 开发
4. springboot 数据访问
异常记录
补充
- 1. 注解 @Condition
- maven repository 下载依赖包">2. 使用 maven repository 下载依赖包
参考

1. spring boot 配置

在这部分将会学习到：
- 配置文件 pplication.properties 或 application.yml 的值注入、占位符、profile 不同环境配置、不同位置的配置文件的加载优先级、外部配置、自动配置的原理及案例分析，以及如何基于 springboot 已有配置进行修改和开发等；
笔记链接

2. spring boot 日志
在这部分将会学习到：
- 了解基本日志框架，重点介绍 springboot 支持的 slf4j +logback 的背景及使用；
笔记链接

3. spring boot 的 web 开发
在这部分将会学习到：
- 对静态资源的映射规则，webjars，自定义静态资源、欢迎页、图标映射等；
- 对比 springmvc 和 springboot 的模板引擎 thymeleaf，学习 thymeleaf 的基本语法规则和简单配置，并利用 thymeleaf 实现 restfulCRUD 案例；
- 了解 springboot 中有关 mvc 的自动配置机制及定制化的修改；
- springboot 的错误处理机制；
- 如何使用和定制 springboot 内嵌或外置的 servlet 容器
笔记链接

4. springboot 数据访问
在这部分将会学习到：
- 对静态资源的映射规则，webjars，自定义静态资源、欢迎页、图标映射等；
笔记链接

异常记录
1. springboot 单元测试显示 no runnable methods ```java 三月 15, 2020 3:40:10 下午 org.junit.vintage.engine.descriptor.RunnerTestDescriptor warnAboutUnfilterableRunner 警告: Runner org.junit.internal.runners.ErrorReportingRunner (used on class com.cyt.springboot.SpringBoot02ConfigApplicationTests) does not support filtering and will therefore be run completely.

java.lang.Exception: No runnable methods at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:191) at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:128) at org.junit.runners.ParentRunner.validate(ParentRunner.java:416) at org.junit.runners.ParentRunner.(ParentRunner.java:84) at org.junit.runners.BlockJUnit4ClassRunner.(BlockJUnit4ClassRunner.java:65) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.(SpringJUnit4ClassRunner.java:137) at org.springframework.test.context.junit4.SpringRunner.(SpringRunner.java:49) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104) at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder$DefensiveAnnotatedBuilder.buildRunner(DefensiveAllDefaultPossibilitiesBuilder.java:113) at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:86) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26) at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder.runnerForClass(DefensiveAllDefaultPossibilitiesBuilder.java:56) at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59) at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolveTestClass(ClassSelectorResolver.java:66) at org.junit.vintage.engine.discovery.ClassSelectorResolver.resolve(ClassSelectorResolver.java:47) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:129) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1351) at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:174) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:120) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.access$100(EngineDiscoveryRequestResolution.java:53) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution$DefaultContext.resolve(EngineDiscoveryRequestResolution.java:227) at org.junit.vintage.engine.discovery.MethodSelectorResolver.resolveParentAndAddFilter(MethodSelectorResolver.java:56) at org.junit.vintage.engine.discovery.MethodSelectorResolver.resolve(MethodSelectorResolver.java:40) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.lambda$resolve$2(EngineDiscoveryRequestResolution.java:138) at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) at java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1351) at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:152) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:464) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:174) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolve(EngineDiscoveryRequestResolution.java:120) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.resolveCompletely(EngineDiscoveryRequestResolution.java:87) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolution.run(EngineDiscoveryRequestResolution.java:80) at org.junit.platform.engine.support.discovery.EngineDiscoveryRequestResolver.resolve(EngineDiscoveryRequestResolver.java:112) at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:42) at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:62) at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:177) at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:164) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)


   - 原因：在 pom 里的 junit 和 @Test 的 junit 版本对应不一致，在@Test 时选择 maven 下的版本既可，SpringJUnit4ClassRunner 只支持 4.12 及以上版本；
   - 解决：将 org.junit.jupiter.api.Test 这个包替换成 org.junit.Test，并将 test 类和方法都用 public 修饰；
- 2. 使用 application.properties 会出现中文乱码
   - 原因：properties 在运行时需要转化为 ASCII 编码，而文件为 UTF-8 编码；
   - 解决：File->Setting->File-Encodings 如下图设置，如果还是乱码，可尝试用单引号将字段圈起来，如： person.name='陈玉婷'；
![image.png](https://cdn.nlark.com/yuque/0/2020/png/611598/1584261726800-9c76bf80-0a84-49c3-bd8e-00ba7efcf8da.png#align=left&display=inline&height=707&name=image.png&originHeight=707&originWidth=944&size=75263&status=done&style=none&width=944)
- 3. 在 application.yml 配置 msql 数据源
   - mysqljdbc 6.0 版本以上必须配置“serverTimezone”参数， UTC 代表的是全球标准时间；
```yaml
spring:
  dataSource:
    username: root
    password: 1234
    url: jdbc:mysql://localhost:3306/test_jdbc #应改为jdbc:mysql://localhost:3306/test_jdbc?serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver #应改为com.mysql.cj.jdbc.Driver
两个报错：
错误1：Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
报错2：Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the 'serverTimezone' configuration property) to use a more specifc time zone value if you want to utilize time zone support.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

1. 报错：org.thymeleaf.exceptions.TemplateInputException: Error resolving template
  - 解决：可以将 @Controller 换成 @RestController，不过需要注意有没有其他的方法返回了 html 页面，会导致返回的不是页面而是字符串，最好的方法就是在所请求的方法上面加一个 @ResponseBody ；
    
    补充
    
    1. 注解 @Condition
  - Spring @Conditional注解详细讲解及示例
  - spring 4.x @Condition 注解详解
    2. 使用 maven repository 下载依赖包
    参考
    SpringBoot权威教程_spring boot_springboot核心篇+springboot整合篇-雷丰阳_尚硅谷
     springboot 中文索引及各种相关资料文档

java 学习记录

spring boot 系统学习

1. spring boot 配置

2. spring boot 日志

3. spring boot 的 web 开发

4. springboot 数据访问

异常记录

补充

1. 注解 @Condition

2. 使用 maven repository 下载依赖包

参考