英文:
External properties file in spring
问题
我有一个使用Maven构建的Java命令行程序，涉及Spring框架但不是Spring Boot。在使用Maven的maven-assembly-plugin插件构建包含所有依赖的JAR文件时，会包含application.properties文件。我想知道如何读取外部的application.properties文件而不是JAR包内部的那个。
我目前是这样读取属性文件的：
@PropertySource(value = { "classpath:application.properties" })
如果我打印类路径（classpath），类路径只包括JAR包路径，而不包括当前目录。
英文:
I have a java,spring and not spring boot command line program with maven , which when i build a jar with all dependencies using maven-assembly-plugin , it includes application.properties, what i need to know is how to read the external application.properties and not the jar one.
I am reading the property file as:
@PropertySource(value = { "classpath:application.properties" })
If I print the classpath, the classpath does only include the jar and not the current directory.
答案1
得分: 0
这里是你可以做的：
@PropertySources({
@PropertySource("classpath:application.properties"),
@PropertySource(value = "file:/etc/config/my-custom-config.properties", ignoreResourceNotFound = true)
})
这个 ignoreResourceNotFound 自从 Spring 4.3 版本就可用，而且很容易理解。
你也可以选择 "编程式" 方法。在纯 Spring 中（不是你在问题中提到的 Spring Boot）：
@Configuration
public class CommonConfig {
...
@Bean
public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
PropertySourcesPlaceholderConfigurer ppc = new PropertySourcesPlaceholderConfigurer();
ppc.setLocations(new FileSystemResource("/etc/config/my-custom-config.properties"),
new ClassPathResource("config/application.properties"));
return ppc;
}
...
}
FileSystemResource 用于访问外部文件系统中的资源。
ClassPathResource 用于访问类路径中的资源。
英文:
Here is what you can do:
@PropertySources({
@PropertySource("classpath:application.properties"),
@PropertySource(value = "file:/etc/config/my-custom-config.properties", ignoreResourceNotFound = true)
})
This ignoreResourceNotFound is available since spring 4.3 and is pretty self-explanatory.
You can also opt for "programmatic" approach. In pure spring (not spring boot as you've mentioned in the question):
@Configuration
public class CommonConfig {
...
@Bean
public static PropertySourcesPlaceholderConfigurer propertyPlaceholderConfigurer() {
PropertySourcesPlaceholderConfigurer ppc = new PropertySourcesPlaceholderConfigurer();
ppc.setLocations(new FileSystemResource("/etc/config/my-custom-config.properties"),
new ClassPathResource("config/application.properties"),
return ppc;
}
...
}
FileSystemResource is for accessing resources available externally in the file system
ClassPathResource is for accessing resources in the classpath
答案2
得分: 0
我们使用动态生成的配置文件，其中注入了特定环境的机密信息。使一切保持一致的组合如下：
代码：
myFunction(@Value("${custom.configuration.name}") final String customConfigurationName) {
InputStream inputStream = new ClassPathResource(customconfigFileName).getInputStream();
// ...
}
模板 - 添加一个硬性要求的路径，以确认文件在磁盘上并已加载：
- name: SPRING_CONFIG_LOCATION
value: file:./config/schema-${ENV}.yml
...
- name: custom.configuration.name
value: file:config/schema-${ENV}.yml
英文:
We use dynamically generated configuration files that are injected with environment specific secrets. The combination to get everything aligned is as follows:
Code:
myFunction(@Value("${custom.configuration.name}") final String customConfigurationName) {
InputStream inputStream=new ClassPathResource(customconfigFileName).getInputStream()){}
...
}
Template - Add a hard required path as this confirms the file is on disk and loaded:
- name: SPRING_CONFIG_LOCATION
value: file:./config/schema-${ENV}.yml
...
- name: custom.configuration.name
value: file:config/schema-${ENV}.yml
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