为此，您需要注册一个ApplicationListener。ApplicationPreparedEvent]根据文档，要捕获的事件是：
ApplicationPreparedEvent是一个启动事件，当SpringApplication启动并且ApplicationContext已完全准备但未刷新时，发布该事件。在此阶段将加载Bean定义，并且可以使用环境了。
主要方法如下所示：
public static void main(String[] args) {
SpringApplication springApplication = new SpringApplication(MyApplication.class);
springApplication.addListeners(new PropertiesLogger());
springApplication.run(args);
}
我重用了当前问题中引用的答案的代码，但由于您所获取的上下文尚未刷新，并且环境的结构与应用程序启动后的结构并不完全相同，因此我对其进行了修改。我还按属性来源打印了属性：一个用于系统环境，一个用于系统属性，一个用于应用程序配置属性，等等。请注意，ApplicationPreparedEvent可以多次触发，并且我打印了属性只有第一次。有关详细信息，请参见Spring Boot问题＃8899。
package com.toto.myapp.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.context.event.ApplicationPreparedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.EnumerablePropertySource;
import org.springframework.core.env.PropertySource;
import java.util.LinkedList;
import java.util.List;
public class PropertiesLogger implements ApplicationListener<ApplicationPreparedEvent> {
private static final Logger log = LoggerFactory.getLogger(PropertiesLogger.class);
private ConfigurableEnvironment environment;
private boolean isFirstRun = true;
@Override
public void onApplicationEvent(ApplicationPreparedEvent event) {
if (isFirstRun) {
environment = event.getApplicationContext().getEnvironment();
printProperties();
}
isFirstRun = false;
}
public void printProperties() {
for (EnumerablePropertySource propertySource : findPropertiesPropertySources()) {
log.info("******* " + propertySource.getName() + " *******");
String[] propertyNames = propertySource.getPropertyNames();
Arrays.sort(propertyNames);
for (String propertyName : propertyNames) {
String resolvedProperty = environment.getProperty(propertyName);
String sourceProperty = propertySource.getProperty(propertyName).toString();
if(resolvedProperty.equals(sourceProperty)) {
log.info("{}={}", propertyName, resolvedProperty);
}else {
log.info("{}={} OVERRIDDEN to {}", propertyName, sourceProperty, resolvedProperty);
}
}
}
}
private List<EnumerablePropertySource> findPropertiesPropertySources() {
List<EnumerablePropertySource> propertiesPropertySources = new LinkedList<>();
for (PropertySource<?> propertySource : environment.getPropertySources()) {
if (propertySource instanceof EnumerablePropertySource) {
propertiesPropertySources.add((EnumerablePropertySource) propertySource);
}
}
return propertiesPropertySources;
}
}
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