sprinboot 配置属性
官网：
Spring Boot Features（Externalized Configuration）
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命令行参数
命令格式
# 虚拟机参数
java -Dserver.port=8000 -jar demo.jar
java -jar -Dserver.port=8000 demo.jar
java -jar demo.jar -Dserver.port=8000
# 应用参数（在jar包后面，其余位置会报错）
java -jar demo.jar --server.port=8000
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命令行 json文件
命令格式
# 虚拟机参数
java -Dspring.application.json='{"my":{"name":"test"}}' -jar myapp.jar
# 应用参数
java -jar myapp.jar --spring.application.json='{"my":{"name":"test"}}'
# 与application.yml等效
my:
name: test
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属性文件
ConfigFileApplicationListener：
springboot 2.4开始不推荐使用，2.6计划移除
@Deprecated
public class ConfigFileApplicationListener implements EnvironmentPostProcessor, SmartApplicationListener, Ordered {
private static final String DEFAULT_SEARCH_LOCATIONS = "classpath:/,classpath:/config/,file:./,file:./config/*/,file:./config/";
//配置文件的默认加载目录
//目录层级加载顺序：classpath:/、classpath:/config/、
// file:./、file:./config/、file:./config/*/
//同一目录层级，先加载yml、再加载properties
//相同属性，先加载的被后加载的覆盖
private static final String DEFAULT_NAMES = "application";
//属性文件名称默认为application，如：application.yml
private static final Set<String> NO_SEARCH_NAMES = Collections.singleton((Object)null);
private static final Bindable<String[]> STRING_ARRAY = Bindable.of(String[].class);
private static final Bindable<List<String>> STRING_LIST = Bindable.listOf(String.class);
private static final Set<String> LOAD_FILTERED_PROPERTY;
public static final String ACTIVE_PROFILES_PROPERTY = "spring.profiles.active";
public static final String INCLUDE_PROFILES_PROPERTY = "spring.profiles.include";
public static final String CONFIG_NAME_PROPERTY = "spring.config.name";
//属性文件名称，默认为application
public static final String CONFIG_LOCATION_PROPERTY = "spring.config.location";
//属性文件加载位置，如果指定了，则不从默认目录加载
//Config file locations that replace the defaults
public static final String CONFIG_ADDITIONAL_LOCATION_PROPERTY = "spring.config.additional-location";
//属性文件额外加载位置（同时从默认目录加载配置文件）
public static final int DEFAULT_ORDER = -2147483638;
private final Log logger;
private static final Resource[] EMPTY_RESOURCES;
private static final Comparator<File> FILE_COMPARATOR;
private String searchLocations;
private String names;
private int order;
public ConfigFileApplicationListener() {
this(new DeferredLog());
}
ConfigFileApplicationListener(Log logger) {
this.order = -2147483638;
this.logger = logger;
}
注意事项
spring.config.name, spring.config.location, and spring.config.additional-location
are used very early to determine which files have to be loaded.
三个配置参数决定配置文件的加载，使用得很早
They must be defined as an environment property (typically an OS environment variable,
a system property, or a command-line argument).
应将这三个参数设置为环境参数、或者在命令行中使用
示例
java -jar myproject.jar --spring.config.name=myproject
# 设置配置文件名称为myproject，
# 应用程序加载配置文件(myproject.properties、myproject.yml)
java -jar myproject.jar --spring.config.location=\
optional:classpath:/default.properties,\
optional:classpath:/override.properties
# 文件加载位置：classpath:/default.properties、classpath:/override.properties
# optional：如果文件不存在，不会报错
java -jar myproject.jar --spring.config.location=\
optional:classpath:/default.properties,\
optional:classpath:/dir/
# 同时指定加载的配置文件、配置目录
# 指定配置目录需要以“/”结尾
java -jar myproject.jar --spring.config.additional-location=\
optional:classpath:/additional.properties,\
optional:file:./additional-dir/
# 先加载默认属性文件，后加载additional属性文件
# 同名属性，additional文件会覆盖
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profile 配置文件
示例
/cfg
application-live.properties
/ext
application-live.properties
application-prod.properties
# location 逗号间隔，配置文件加载顺序：
先加载cfg目录,再加载ext目录；同目录层层级先加载prod,再加载live
spring.config.location = classpath:/cfg/,classpath:/ext/
spring.profiles.active = prod,live
/cfg/application-live.properties
/ext/application-prod.properties
/ext/application-live.properties
# location 分号间隔，配置文件加载顺序：
配置文件加载不分先后，在同一层级(process /cfg and /ext at the same level)
spring.config.location = classpath:/cfg/;classpath:/ext/
spring.profiles.active = prod,live
/ext/application-prod.properties
/cfg/application-live.properties
/ext/application-live.properties
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import 配置文件
示例
# 导入配置文件dev.properties
spring.config.import=optional:file:./dev.properties
# 同一文档中，application.properties中spring.config.import
# 导入的文件会覆盖application.properties的同名属性
# 并且与spring.config.import的位置无关
# application.properties文件如下，my.properties如有my.property，
# 都会覆盖application.properties中的my.property属性
spring.config.import=my.properties
my.property=value
my.property=value
spring.config.import=my.properties
导入不带拓展名的文件：
myconfig
# 将文件导入为properties
spring.config.import=file:/etc/config/myconfig[.properties]
# 将文件导入为yml
spring.config.import=file:/etc/config/myconfig[.yml]
导入云平台配置树：
key为目录节点名、value为目录内容
# 配置树
etc/
config/
myapp/
username
password
spring:
config:
import: "optional:configtree:/etc/config/"
应用导入的配置属性
myapp.username=value(/etc/config/myapp/username 目录内容)
myapp.password=value2(/etc/config/myapp/password 目录内容)
导入云平台多配置树
etc/
config/
dbconfig/
db/
username
password
mqconfig/
mq/
username
password
spring:
config:
import: "optional:configtree:/etc/config/*/"
应用导入的配置
db.username=value(/etc/config/dbconfig/db/username)
db.password=value2(/etc/config/dbconfig/db/password)
mq.username=value3(/etc/config/mqconfig/mq/username)
mq.password=value4(/etc/config/mqconfig/mq/password)
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属性引用
示例
app:
name: "MyApp"
description: "${app.name} is a Spring Boot application"
app.description的属性值为：MyApp is a Spring Boot application
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使用随机数
示例
my:
secret: "${random.value}" #随机值（包含字符、数字）
number: "${random.int}" #随机整数（int）
bignumber: "${random.long}" #随机整数（long）
uuid: "${random.uuid}" #uuid数
number-less-than-ten: "${random.int(10)}" #小于等于10的随机整数
number-in-range: "${random.int[1024,65536]}" #1024、65536之间的随机整数
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多文档属性文件
yml分隔符：
—
properties分隔符：
#—
示例：
application.yml
spring:
application:
name: MyApp
---
spring:
config:
activate:
on-cloud-platform: kubernetes
application:
name: MyCloudApp
示例：
application.properties
spring.application.name=MyApp
#---
spring.config.activate.on-cloud-platform=kubernetes
spring.application.name=MyCloudApp
注意事项
分隔符前面不能有空格
分隔符紧邻的上下行不能为注释
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属性文件激活
相关配置
# 激活dev,prod属性
spring.profiles.active=dev,prod
# 满足指定条件下激活
spring.config.activate.on-profile=
spring.config.activate.on-cloud-platform=
说明：spring.profiles.active不能与spring.config.activate.on-*在同一文档中出现
示例
myprop:
always-set
---
spring:
config:
activate:
on-cloud-platform: "kubernetes"
on-profile: "prod | staging"
myotherprop: sometimes-set
CloudPlatform：
云平台
public enum CloudPlatform {
NONE {
public boolean isDetected(Environment environment) {
return false;
}
},
CLOUD_FOUNDRY {
public boolean isDetected(Environment environment) {
return environment.containsProperty("VCAP_APPLICATION") || environment.containsProperty("VCAP_SERVICES");
}
},
HEROKU {
public boolean isDetected(Environment environment) {
return environment.containsProperty("DYNO");
}
},
SAP {
public boolean isDetected(Environment environment) {
return environment.containsProperty("HC_LANDSCAPE");
}
},
KUBERNETES {
private static final String KUBERNETES_SERVICE_HOST = "KUBERNETES_SERVICE_HOST";
private static final String KUBERNETES_SERVICE_PORT = "KUBERNETES_SERVICE_PORT";
private static final String SERVICE_HOST_SUFFIX = "_SERVICE_HOST";
private static final String SERVICE_PORT_SUFFIX = "_SERVICE_PORT";
public boolean isDetected(Environment environment) {
return environment instanceof ConfigurableEnvironment ? this.isAutoDetected((ConfigurableEnvironment)environment) : false;
}
private boolean isAutoDetected(ConfigurableEnvironment environment) {
PropertySource<?> environmentPropertySource = environment.getPropertySources().get("systemEnvironment");
if (environmentPropertySource != null) {
if (environmentPropertySource.containsProperty("KUBERNETES_SERVICE_HOST") && environmentPropertySource.containsProperty("KUBERNETES_SERVICE_PORT")) {
return true;
}
if (environmentPropertySource instanceof EnumerablePropertySource) {
return this.isAutoDetected((EnumerablePropertySource)environmentPropertySource);
}
}
return false;
}
private boolean isAutoDetected(EnumerablePropertySource<?> environmentPropertySource) {
String[] var2 = environmentPropertySource.getPropertyNames();
int var3 = var2.length;
for(int var4 = 0; var4 < var3; ++var4) {
String propertyName = var2[var4];
if (propertyName.endsWith("_SERVICE_HOST")) {
String serviceName = propertyName.substring(0, propertyName.length() - "_SERVICE_HOST".length());
if (environmentPropertySource.getProperty(serviceName + "_SERVICE_PORT") != null) {
return true;
}
}
}
return false;
}
},
AZURE_APP_SERVICE {
private static final String WEBSITE_SITE_NAME = "WEBSITE_SITE_NAME";
private static final String WEBSITES_ENABLE_APP_SERVICE_STORAGE = "WEBSITES_ENABLE_APP_SERVICE_STORAGE";
public boolean isDetected(Environment environment) {
return environment.containsProperty("WEBSITE_SITE_NAME") && environment.containsProperty("WEBSITES_ENABLE_APP_SERVICE_STORAGE");
}
};
private static final String PROPERTY_NAME = "spring.main.cloud-platform";
private CloudPlatform() {
}
public boolean isActive(Environment environment) {
String platformProperty = environment.getProperty("spring.main.cloud-platform");
return this.isEnforced(platformProperty) || platformProperty == null && this.isDetected(environment);
}
public boolean isEnforced(Environment environment) {
return this.isEnforced(environment.getProperty("spring.main.cloud-platform"));
}
public boolean isEnforced(Binder binder) {
return this.isEnforced((String)binder.bind("spring.main.cloud-platform", String.class).orElse((Object)null));
}
private boolean isEnforced(String platform) {
return this.name().equalsIgnoreCase(platform);
}
public abstract boolean isDetected(Environment environment);
public boolean isUsingForwardHeaders() {
return true;
}
public static CloudPlatform getActive(Environment environment) {
if (environment != null) {
CloudPlatform[] var1 = values();
int var2 = var1.length;
for(int var3 = 0; var3 < var2; ++var3) {
CloudPlatform cloudPlatform = var1[var3];
if (cloudPlatform.isActive(environment)) {
return cloudPlatform;
}
}
}
return null;
}
}
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