run执行原理
run
开启服务
package com.hyc.spring01helloworld; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; //@SpringBootApplication 标注这个类是一个springboot的应用：启动类下的资源全部被导入 @SpringBootApplication public class Spring01HelloworldApplication { public static void main(String[] args) { SpringApplication.run(Spring01HelloworldApplication.class, args); } }
SpringBootApplication.run分析
主要是两个部分，一个是SpringBootApplication实例化，一个是run的执行
SpringBootApplication
执行的步骤：
推断应用类型是普通的java项目还是web项目
查找并加载所有可用的初始化器，设置到initializers实行中
找出所有的应用程序监听器，设置到listeners属性中
推断并且设置main方法定义类，找到运行的主类
查看构造器
public SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) { this.sources = new LinkedHashSet(); this.bannerMode = Mode.CONSOLE; this.logStartupInfo = true; this.addCommandLineProperties = true; this.addConversionService = true; this.headless = true; this.registerShutdownHook = true; this.additionalProfiles = Collections.emptySet(); this.isCustomEnvironment = false; this.lazyInitialization = false; this.applicationContextFactory = ApplicationContextFactory.DEFAULT; this.applicationStartup = ApplicationStartup.DEFAULT; this.resourceLoader = resourceLoader; Assert.notNull(primarySources, "PrimarySources must not be null"); this.primarySources = new LinkedHashSet(Arrays.asList(primarySources)); this.webApplicationType = WebApplicationType.deduceFromClasspath(); this.bootstrapRegistryInitializers = this.getBootstrapRegistryInitializersFromSpringFactories(); this.setInitializers(this.getSpringFactoriesInstances(ApplicationContextInitializer.class)); this.setListeners(this.getSpringFactoriesInstances(ApplicationListener.class)); this.mainApplicationClass = this.deduceMainApplicationClass(); }
SpringBoot配置
官方配置太多，
如何配置tml
学习原理，一通百通
yml是什么?
YAML是"YAML Ain’t a Markup Language"（YAML不是一种标记语言）的递归缩写。在开发的这种语言时，YAML 的意思其实是：“Yet Another Markup Language”（仍是一种标记语言），但为了强调这种语言以数据做为中心，而不是以标记语言为重点，而用反向缩略语重命名。
标记语言：
以前的配置文件，大多数都是用xml来配置，比如一个简单的端口配置，我们来对比下yaml和xml的区别
yml：
server:
port: 8080
xml：
<server>
<port>8080</port>
</server>
yml:特点
K：V
对空格的要求十分高
普通的key-value
可以注入到我们的配置类中
两种赋值方式
1.注解赋值
@Component public class Dog { @Value("郑文杰") private String name; @Value("3") private Integer age;
2.YML注入
实体类：
@Component @ConfigurationProperties(prefix = "person") public class person { private String name; private Integer age; private Boolean happy; private Date birth; private Map<String,Object> maps; private List<Object> lists; private Dog dog;
YML:
person: name: hyc age : 3 happy: false birth: 2019/11/02 maps: {k1: 123, k2: 456} lists: -code -music -girl dog: name: 旺财 age: 3
@ConfigurationProperties（）作用：
将配置文件中每个属性的值，映射这个组件中；
告诉SpringBoot将奔雷所有的属性和配置文件中相关的配置进行绑定
参数perfix = “person” 将person组件（类）和yml中person的值对应绑定
@PropertySource
指定配置文件：properties文件
@PropertySource(value = "classpath:application.properties")
用@value赋值
SpringBoot推荐我们用yml
对比：
应为yml十分灵活：
person: name: hyc age : ${random.int} happy: false birth: 2019/11/02 maps: {k1: 123, k2: 456} lists: -code -music -girl dog: name: 旺财 age: 3
java类
package com.hyc.pojo; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; import org.springframework.validation.annotation.Validated; import javax.validation.constraints.Email; import java.util.Date; import java.util.List; import java.util.Map; @Component @ConfigurationProperties(prefix = "person") @Validated //数据校验 public class person { @Email(message = "邮箱格式错误") private String name; private Integer age; private Boolean happy; private Date birth; private Map<String,Object> maps; private List<Object> lists; private Dog dog; @Override public String toString() { return "person{" + "name='" + name + '\'' + ", age=" + age + ", happy=" + happy + ", birth=" + birth + ", maps=" + maps + ", lists=" + lists + ", dog=" + dog + '}'; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Boolean getHappy() { return happy; } public void setHappy(Boolean happy) { this.happy = happy; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } public Map<String, Object> getMaps() { return maps; } public void setMaps(Map<String, Object> maps) { this.maps = maps; } public List<Object> getLists() { return lists; } public void setLists(List<Object> lists) { this.lists = lists; } public Dog getDog() { return dog; } public void setDog(Dog dog) { this.dog = dog; } }
jsr303校验注解：
@Validated //数据校验
校验示例：
java类：
@Component @ConfigurationProperties(prefix = "person") @Validated //数据校验 public class person { @Email(message = "邮箱格式错误") private String name; private Integer age; private Boolean happy; private Date birth; private Map<String,Object> maps; private List<Object> lists; private Dog dog;
YML:此时我们的name并不是邮箱格式
person: name: hyc age : ${random.int} happy: false birth: 2019/11/02 maps: {k1: 123, k2: 456} lists: -code -music -girl dog: name: 旺财 age: 3
执行效果：
使用了@Validated //数据校验注解的类可以对自己的属性设置格式数据校验
全部注解：
常用注解：
正则表达式：相对核心
源码位置：
