注入

@Value&ConfigurationProperties

@PropertySource:

• 加载指定的配置文件

@ImportResource:

• 加载Spring配置文件

  @ImportResource(location = {"xmlFilePath"})
  

  推荐使用全注解的方式：

  // Bean id is the name of the method
  // the return value is the object in IOC container.
  @Configuration
  public class ConfigurationClass{
      @Bean
      public BeanMethod beanMethod(){
          ...
      return new Bean;
      }
      ...
  }
  

Profile创建多个环境

• 默认application.properties

• 格式application-{name}.properties

• 配置方式：

  • yaml

    • 用文档块来分环境

      server:
        port: 8080
      spring:
        profiles: 
        active: {env}
      ---
      server:
        port: 8081
      spring:
        profiles: dev
      ---
      server:
        port: 8082
      spring:
        profiles: prod
      

  • properties

    • spring.profile.active={env}
    • 命令行
      • –spring.profile.active={env}
    • 虚拟机
      • -Dspring.profile.active={env}

配置文件加载顺序

按以下顺序（由高到低）：

1. file: ./config/
2. file: ./
3. classpath: /config/
4. classpath: /

高优先级文件会覆盖低优先级的文件。

若要指定路径，请用 –spring.config.location={path}

具体请看 https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config

配置

参照：https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#common-application-properties

查看生效的自动配置类：debug=true

thymeleaf

HTML 文件格式

标准表达式

• Simple expressions:
  • Variable Expressions: ${…}
  • Selection Variable Expressions: *{…}
  • Message Expressions: #{…}
  • Link URL Expressions: @{…}
  • Fragment Expressions: ~{…}
• Literals
  • Text literals: ‘one text’ , ‘Another one!’ ,…
  • Number literals: 0 , 34 , 3.0 , 12.3 ,…
  • Boolean literals: true , false
  • Null literal: null
  • Literal tokens: one , sometext , main ,…
• Text operations:
  • String concatenation: +
  • Literal substitutions: |The name is ${name}|
• Arithmetic operations:
  • Binary operators: + , - , * , / , %
  • Minus sign (unary operator): -
• Boolean operations:
  • Binary operators: and , or
  • Boolean negation (unary operator): ! , not
• Comparisons and equality:
  • Comparators: > , < , >= , <= ( gt , lt , ge , le )
  • Equality operators: == , != ( eq , ne )
• Conditional operators:
  • If-then: (if) ? (then)
  • If-then-else: (if) ? (then) : (else)
  • Default: (value) ?: (defaultvalue)
• Special tokens:
  • No-Operation: _

Message Expressions: #{...}

    #ctx : the context object.
    #vars: the context variables.
    #locale : the context locale.
    #request : (only in Web Contexts) the HttpServletRequest object.
    #response : (only in Web Contexts) the HttpServletResponse object.
    #session : (only in Web Contexts) the HttpSession object.
    #servletContext : (only in Web Contexts) the ServletContext object
    #execInfo : information about the template being processed.
    #messages : methods for obtaining externalized messages inside variables expressions, in the same way as they
        would be obtained using #{…} syntax.
    #uris : methods for escaping parts of URLs/URIs
        Page 20 of 106#conversions : methods for executing the configured conversion service (if any).
    #dates : methods for java.util.Date objects: formatting, component extraction, etc.
    #calendars : analogous to #dates , but for java.util.Calendar objects.
    #numbers : methods for formatting numeric objects.
    #strings : methods for String objects: contains, startsWith, prepending/appending, etc.
    #objects : methods for objects in general.
    #bools : methods for boolean evaluation.
    #arrays : methods for arrays.
    #lists : methods for lists.
    #sets : methods for sets.
    #maps : methods for maps.
    #aggregates : methods for creating aggregates on arrays or collections.
    #ids : methods for dealing with id attributes that might be repeated (for example, as a result of an           iteration).