Spring-boot参考（三）配置

本文主要是介绍Spring-boot参考（三）配置，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

debug

开启debug开关可以查看更多的信息

java -jar myproject-0.0.1-SNAPSHOT.jar –debug
或者
在application.yml 中
debug: true

banner.txt在classpath下增加这个文件，可以替换掉启动Spring的图案。

Customizing the Banner

配置文件就是环境变量。

在程序启动时执行一些方法

实现 ApplicationRunner or CommandLineRunner 接口。

@Component
public class MyBean2 implements ApplicationRunner {@Overridepublic void run(ApplicationArguments args) throws Exception {System.out.println(args);}
}

@Component
public class MyBean implements CommandLineRunner {public void run(String... args) {// Do something...System.out.println("hello");System.out.println(args);}}

修改程序退出的返回值

@SpringBootApplication
public class ExitCodeApplication {@Beanpublic ExitCodeGenerator exitCodeGenerator() {return () -> 42;}public static void main(String[] args) {System.exit(SpringApplication.exit(SpringApplication.run(ExitCodeApplication.class, args)));}}

Spring boot 配置参数的加载顺序

Devtools global settings properties on your home directory
(~/.spring-boot-devtools.properties when devtools is active).
@TestPropertySource annotations on your tests.
@SpringBootTest#properties annotation attribute on your tests.
Command line arguments.
Properties from SPRING_APPLICATION_JSON
(inline JSON embedded in an environment variable or system
ServletConfig init parameters.
ServletContext init parameters.
JNDI attributes from java:comp/env.
Java System properties (System.getProperties()).
OS environment variables.
A RandomValuePropertySource that only has properties in random.*.
Profile-specific application properties outside of your packaged jar
(application-{profile}.properties and YAML variants).
Profile-specific application properties packaged inside your jar
(application-{profile}.properties and YAML variants).
Application properties outside of your packaged jar (application.properties and YAML variants).
Application properties packaged inside your jar
(application.properties and YAML variants).
@PropertySource
annotations on your @Configuration classes.
Default properties
(specified using SpringApplication.setDefaultProperties).

配置随机值

my.secret=${random.value}
my.number=${random.int}
my.bignumber=${random.long}
my.uuid=${random.uuid}
my.number.less.than.ten=${random.int(10)}
my.number.in.range=${random.int[1024,65536]}

配置 SpringApplication

public static void main(String[] args) {SpringApplication app = new SpringApplication(MySpringConfiguration.class);app.setBannerMode(Banner.Mode.OFF);app.run(args);
}

配置文件

默认会从 application.properties 这个文件中读取配置

这个文件放在

A /config subdirectory of the current directory.
The current directory
A classpath /config package
The classpath root
这几个位置都可以。

类型安全的配置 ConfigurationProperties

@Value(“${property}”) 可能会造成类型的不安全，所以提供了
ConfigurationProperties

@ConfigurationProperties("foo")
public class FooProperties {private boolean enabled;private InetAddress remoteAddress;private final Security security = new Security();public boolean isEnabled() { ... }public void setEnabled(boolean enabled) { ... }public InetAddress getRemoteAddress() { ... }public void setRemoteAddress(InetAddress remoteAddress) { ... }public Security getSecurity() { ... }public static class Security {private String username;private String password;private List<String> roles = new ArrayList<>(Collections.singleton("USER"));public String getUsername() { ... }public void setUsername(String username) { ... }public String getPassword() { ... }public void setPassword(String password) { ... }public List<String> getRoles() { ... }public void setRoles(List<String> roles) { ... }}
}