如何使用Spring Boot从java属性文件中读取数据 [英] How to read data from java properties file using Spring Boot
问题描述
我有一个spring boot应用程序,我想从application.properties文件中读取一些变量。事实上,下面的代码就是这样做但我认为这种方法有一个很好的方法。
I have a spring boot application and I want to read some variable from my application.properties file. In fact below codes do that. But I think there is a good method for this alternative.
Properties prop = new Properties();
InputStream input = null;
try {
input = new FileInputStream("config.properties");
prop.load(input);
gMapReportUrl = prop.getProperty("gMapReportUrl");
} catch (IOException ex) {
ex.printStackTrace();
} finally {
...
}
推荐答案
您可以使用 @PropertySource
将配置外部化为属性文件。有多种方法可以获得房产:
You can use @PropertySource
to externalize your configuration to a properties file. There is number of way to do get properties:
1。
使用 @Value
将属性值分配给字段,并使用 PropertySourcesPlaceholderConfigurer
来解析 $ {}
in @Value
:
1.
Assign the property values to fields by using @Value
with PropertySourcesPlaceholderConfigurer
to resolve ${}
in @Value
:
@Configuration
@PropertySource("file:config.properties")
public class ApplicationConfiguration {
@Value("${gMapReportUrl}")
private String gMapReportUrl;
@Bean
public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
return new PropertySourcesPlaceholderConfigurer();
}
}
2。
使用环境
获取房产价值:
2.
Get the property values by using Environment
:
@Configuration
@PropertySource("file:config.properties")
public class ApplicationConfiguration {
@Autowired
private Environment env;
public void foo() {
env.getProperty("gMapReportUrl");
}
}
希望这可以帮助
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