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，我想从我的 application.properties 文件中读取一些变量.事实上，下面的代码就是这样做的.但我认为这个替代方案有一个很好的方法.

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 将您的配置具体化到一个属性文件中.有多种获取属性的方法:

You can use @PropertySource to externalize your configuration to a properties file. There is number of way to do get properties:

1.通过使用 @Value 和 PropertySourcesPlaceholderConfigurer 将属性值分配给字段以解析 @Value 中的 ${}:

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 Environment 获取属性值:

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");
    }

}

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