SpringBoot--配置文件--数据类型对应--application.yml/application.properties

我会带着你远行 2022-09-12 02:56 141阅读 0赞

原文网址：[SpringBoot--配置文件--数据类型对应--application.yml/application.properties\_IT利刃出鞘的博客-CSDN博客][SpringBoot--_--_--application.yml_application.properties_IT_-CSDN]

# **引用** #

spring:
      application:
        name: storage
      cloud:
        config:
          name: ${spring.application.name}

# 数组 #

## 法1：逗号 ##

**applicaiton.yml**

> **单行写法**
> 
>     test:
>       myList: Tony,Pepper
> 
> **多行写法**
> 
>     test:
>       myList: 'Tony,Pepper
>                Peter'

**代码**

>     @Value("${test.myList}")
>     private List<String> lastNames;
> 
> 或者：
> 
>     @Value("#{'${test.myList}'.split(',')}")
>     private List<String> lastNames;

> 注意：以上List<String> 完全可以换成String\[\]、Set<String>。

## 法2：并列的“-” ##

**applicaiton.yml**

>     test:
>       myList:
>         - Tony
>         - Pepper

**代码（成功的）**

>     package com.example.tmp;
>     
>     import lombok.Data;
>     import org.springframework.boot.context.properties.ConfigurationProperties;
>     import org.springframework.stereotype.Component;
>     
>     import javax.annotation.PostConstruct;
>     import java.util.List;
>     
>     @Data
>     @Component
>     @ConfigurationProperties(prefix = "test")
>     public class TestProperties {
>         private List<String> mylist;
>     
>         @PostConstruct
>         public void print() {
>             System.out.println(mylist);
>         }
>     }
> 
> 运行结果
> 
>     [Tony, Pepper]

**代码（失败的）**

>     package com.example.tmp;
>     
>     import org.springframework.beans.factory.annotation.Value;
>     import org.springframework.stereotype.Component;
>     
>     import javax.annotation.PostConstruct;
>     import java.util.List;
>     
>     @Component
>     public class TestConfig {
>         @Value("${test.mylist}")
>         private List<String> mylist;
>     
>         @PostConstruct
>         public void print() {
>             System.out.println(mylist);
>         }
>     }
> 
> 这样启动会直接报错：
> 
> Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'test.mylist' in value "$\{test.mylist\}"

# Map #

## 法1：对象 ##

**application.yml**

>     test:
>       myMap:
>         lastName: Tony
>         firstName: Stark

**代码**

>     package com.example.tmp;
>     
>     import lombok.Data;
>     import org.springframework.boot.context.properties.ConfigurationProperties;
>     import org.springframework.stereotype.Component;
>     
>     import javax.annotation.PostConstruct;
>     import java.util.Map;
>     
>     @Data
>     @Component
>     @ConfigurationProperties(prefix = "test")
>     public class TestProperties {
>         private Map<String, String> myMap;
>     
>         @PostConstruct
>         public void print() {
>             System.out.println(myMap);
>         }
>     }
> 
> 执行结果
> 
>     {lastName=Tony, firstName=Stark}

**注意**

> 如果application.yml如下：
> 
>     test:
>       myMap:
>         "19:00:00": 5
>         "19:30:00": 6
> 
> 打印结果为：
> 
>     {190000=5, 193000=6}
> 
> 暂时没找到原因，如果要用时间，可以用数组包含对象的方式：见下边“数组包含对象”

## 法2：对象放到字符串中 ##

**application.yml**

>     test:
>       myMap:
>         '{
>           lastName: "Tony",
>           firstName: "Stark",
>           code: "01"
>         }'

**代码**

>     @Value("#{${test.myMap}}")
>     Map<String, String> map;

**注意**

> **1. 对于01，外边必须有引号**
> 
> 否则识别出来之后，只有1，少了0
> 
> **2. application.yml的对象必须放到引号里**
> 
> 下边几种方法都是不可以的：
> 
>     test:
>       myMap:
>         lastName: "Tony",
>         firstName: "Stark",
>         code: 01
> 
>     test:
>       myMap:
>         {
>           lastName: "Tony",
>           firstName: "Stark",
>           code: 01
>         }
> 
> **3.key不能有横线，可以有下划线 。**
> 
> 比如：last-name不可以，last\_name可以。

# 数组包含对象 #

> **application.yml**
> 
>     test:
>       myMap:
>         -
>           time: "19:00:00"
>           delay: 5
>         -
>           time: "19:30:00"
>           delay: 6
> 
> 或者
> 
>     test:
>       myMap:
>         - {time: "19:00:00", delay: 5}
>         - {time: "19:30:00", delay: 6}

**代码**

>     package com.example.tmp;
>     
>     import lombok.Data;
>     import org.springframework.boot.context.properties.ConfigurationProperties;
>     import org.springframework.stereotype.Component;
>     
>     import javax.annotation.PostConstruct;
>     import java.util.List;
>     import java.util.Map;
>     
>     @Data
>     @Component
>     @ConfigurationProperties(prefix = "test")
>     public class MyBean {
>         private List<Map<String, String>> myMap;
>     
>         @PostConstruct
>         public void print() {
>             System.out.println(myMap);
>         }
>     }
> 
> 执行结果
> 
>     [{delay=5, time=19:00:00}, {time=19:30:00, delay=6}]

> 或者这么写：
> 
>     package com.example.tmp;
>     
>     import lombok.Data;
>     import org.springframework.boot.context.properties.ConfigurationProperties;
>     import org.springframework.stereotype.Component;
>     
>     import javax.annotation.PostConstruct;
>     import java.util.List;
>     
>     @Data
>     @Component
>     @ConfigurationProperties(prefix = "test")
>     public class MyBean {
>         private List<Program> myMap;
>     
>         @PostConstruct
>         public void print() {
>             System.out.println(myMap);
>         }
>         @Data
>         private static class Program{
>             private String time;
>             private Integer delay;
>         }
>     }
> 
> 结果
> 
>     [MyBean.Program(time=19:00:00, delay=5), MyBean.Program(time=19:30:00, delay=6)]

[SpringBoot--_--_--application.yml_application.properties_IT_-CSDN]: https://knife.blog.csdn.net/article/details/120385747