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4.4.2 查看运行程序的Bean
如果需要了解Spring Boot上下文注入了哪些Bean，这些Bean的类型、状态、生命周期等信息时，只需要发起一个GET类型的请求，请求API为“/beans”，在浏览器上访问 “http://locahost:9001/actuator/beans”，浏览器会显示如下的信息：
[
{
"context": "application:dev:8082",
"parent": null,
"beans": [
{
"bean": "springbootFirstApplication",
"aliases": [
],
"scope": "singleton",
"type": "com.forezp.SpringbootFirstApplication$$EnhancerBySpringCGLIB$$3efbe85a",
"resource": "null",
"dependencies": [
]
},
{
"bean": "org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory",
"aliases": [
],
"scope": "singleton",
"type": "org.springframework.core.type.classreading.CachingMetadataReaderFactory",
"resource": "null",
"dependencies": [
]
},
{
"bean": "configBean",
"aliases": [
],
"scope": "singleton",
"type": "com.forezp.bean.ConfigBean",
"resource": "file [F:/book/springboot-first-application/target/classes/com/forezp/bean/ConfigBean.class]",
"dependencies": [
]
},
{
"bean": "user",
"aliases": [
],
"scope": "singleton",
"type": "com.forezp.bean.User$$EnhancerBySpringCGLIB$$eb8cd986",
"resource": "file [F:/book/springboot-first-application/target/classes/com/forezp/bean/User.class]",
"dependencies": [
]
},
{
"bean": "helloController",
"aliases": [
],
"scope": "singleton",
"type": "com.forezp.web.HelloController",
"resource": "file [F:/book/springboot-first-application/target/classes/com/forezp/web/HelloController.class]",
"dependencies": [
]
},
{
"bean": "lucyController",
"aliases": [
],
"scope": "singleton",
"type": "com.forezp.web.LucyController",
"resource": "file [F:/book/springboot-first-application/target/classes/com/forezp/web/LucyController.class]",
"dependencies": [
"configBean",
"user"
]
}
...
]
在返回的信息中包含了Bean的以下4类信息。
•bean：Spring应用程序上下文中的Bean名称或Id。
•resource：class文件的物理位置，通常是一个Url，指向构建出的Jar文件的路径。
•scope：Bean的作用域（通常是单例singleton，也可以是ptototype、request和session）。
•type：Bean的类型。