<分区>
所以我只是想打印所有已加载的 bean,我理解 getBeanDefinitionNames()
方法是很多人建议的。为此,我知道你需要一个 ApplicationContext
,我按如下方式 Autowiring 它,但是当我调用 getBeanDefinitionNames()
时,我在对象上遇到空指针异常:
package hello;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
public class BeansPrinter
{
@Autowired
private ApplicationContext appContext;
public void printBeans()
{
System.out.println("Number of beans:");
System.out.println(appContext.getBeanDefinitionCount());
String[] names = appContext.getBeanDefinitionNames();
for(String name : names)
{
System.out.println("-----------------");
System.out.println(name);
}
}
}
应用程序.java
package hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
BeansPrinter b = new BeansPrinter();
b.printBeans();
}
}