SpringBoot重写配置文件的属性

第一步：编写MyEnvironmentPostProcessor

package gen;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertySource;

import java.util.HashMap;

public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        HashMap<String, Object> map = new HashMap<>();
        map.put("logging.level.com.dao", "error");
        map.put("server.port", "7400");
        map.put("spring.datasource.username", "root");
        map.put("spring.datasource.password", "123456");
        PropertySource source = new MapPropertySource("myCloudConfig", map);
        MutablePropertySources propertySources = environment.getPropertySources();
        for (PropertySource propertySource : propertySources) {
            if(propertySource.getName().startsWith("applicationConfig: [classpath:/application")){
                propertySources.addBefore(propertySource.getName(), source);
                break;
            }
        }
    }
}

第二步：编写META-INF/spring.factories

org.springframework.boot.env.EnvironmentPostProcessor=gen.MyEnvironmentPostProcessor