在 Spring Boot 中未读取环境属性

Question

我有一个实用程序类来读取环境变量。

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

@Component
public final class PropertyUtil {

    /** The system environment. */
    private static Environment environment;

    public static String getConfigProp(final String key) {
        return environment.getProperty(key);
    }

    @Autowired
    public void setEnvironment(Environment environment) {
        PropertyUtil.environment = environment;
    }
}

我在初始化时在一个 bean 中使用它。问题是，如果我在 tomcat 上部署 war 文件，它会运行文件，但如果我从 eclipse 运行与 spring boot 应用程序相同的应用程序，它不会读取环境属性，因此返回值为 null。

知道导致这个问题的原因是什么吗？

Answer 1

package com.myspringboot.controller;

import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
@Component
public  class PropertyUtil  implements EnvironmentAware {

    /** The system environment. */
    public  Environment environment;

    public  String getConfigProp(String key) {
        return environment.getProperty(key);
    }
    @Override
    public void setEnvironment(Environment arg0) {
        environment=arg0;

    }
}
    @Test
    public void testProperty(){
/*      String driver= System.getenv().get("spring.datasource.driverClassName");
        System.out.println(driver);
        System.out.println(PropertyUtil.environment);*/
        String str= propertyUtil.getConfigProp("spring.datasource.driverClassName");
        System.out.println(str);
    }

Answer 2

package com.myspringboot.controller;

import org.springframework.context.EnvironmentAware;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
@Component
public final  class PropertyUtil  implements EnvironmentAware {

    /** The system environment. */
    public static  Environment environment;

    public static  String getConfigProp(String key) {
        return environment.getProperty(key);
    }
    @Override
    public void setEnvironment(Environment arg0) {
        if(environment==null){
            environment=arg0;
        }

    }
}