SpringBoot 2.x （15）：Actuator监控

Actuator监控：SpringBoot自带的，对生成环境进行监控的系统

使用：既然是监控，那就不能监控一个空项目

这里我使用SpringBoot整合MyBatis的Demo:

https://www.cnblogs.com/xuyiqing/p/10837299.html

依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

然后直接启动项目即可

访问http://localhost:8080/actuator

{
    "_links": {
        "self": {
            "href": "http://localhost:8080/actuator",
            "templated": false
        },
        "health-component-instance": {
            "href": "http://localhost:8080/actuator/health/{component}/{instance}",
            "templated": true
        },
        "health-component": {
            "href": "http://localhost:8080/actuator/health/{component}",
            "templated": true
        },
        "health": {
            "href": "http://localhost:8080/actuator/health",
            "templated": false
        },
        "info": {
            "href": "http://localhost:8080/actuator/info",
            "templated": false
        }
    }
}

显示可监控列表

访问http://localhost:8080/actuator/health

{"status":"UP"}

说明状态正常

进一步地，使用Actuator获取地JSON可以写前端页面进行显示，或者结合定时任务

比如定时访问http://localhost:8080/actuator/health，如果返回UP说明正常，然后进行其他操作

问题解决：访问http://localhost:8080/actuator/health显示404

原因：SpringBoot版本问题，SpringBoot1.x访问http://localhost:8080/health

其实这里获得的是较少的信息，更多的信息需要进行配置：

management.endpoints.web.exposure.include=*

现在访问：http://localhost:8080/actuator

{
    "_links": {
        "self": {
            "href": "http://localhost:8080/actuator",
            "templated": false
        },
        "auditevents": {
            "href": "http://localhost:8080/actuator/auditevents",
            "templated": false
        },
        "beans": {
            "href": "http://localhost:8080/actuator/beans",
            "templated": false
        },
        "caches-cache": {
            "href": "http://localhost:8080/actuator/caches/{cache}",
            "templated": true
        },
        "caches": {
            "href": "http://localhost:8080/actuator/caches",
            "templated": false
        },
        "health": {
            "href": "http://localhost:8080/actuator/health",
            "templated": false
        },
        "health-component-instance": {
            "href": "http://localhost:8080/actuator/health/{component}/{instance}",
            "templated": true
        },
        "health-component": {
            "href": "http://localhost:8080/actuator/health/{component}",
            "templated": true
        },
        "conditions": {
            "href": "http://localhost:8080/actuator/conditions",
            "templated": false
        },
        "configprops": {
            "href": "http://localhost:8080/actuator/configprops",
            "templated": false
        },
        "env": {
            "href": "http://localhost:8080/actuator/env",
            "templated": false
        },
        "env-toMatch": {
            "href": "http://localhost:8080/actuator/env/{toMatch}",
            "templated": true
        },
        "info": {
            "href": "http://localhost:8080/actuator/info",
            "templated": false
        },
        "loggers": {
            "href": "http://localhost:8080/actuator/loggers",
            "templated": false
        },
        "loggers-name": {
            "href": "http://localhost:8080/actuator/loggers/{name}",
            "templated": true
        },
        "heapdump": {
            "href": "http://localhost:8080/actuator/heapdump",
            "templated": false
        },
        "threaddump": {
            "href": "http://localhost:8080/actuator/threaddump",
            "templated": false
        },
        "metrics-requiredMetricName": {
            "href": "http://localhost:8080/actuator/metrics/{requiredMetricName}",
            "templated": true
        },
        "metrics": {
            "href": "http://localhost:8080/actuator/metrics",
            "templated": false
        },
        "scheduledtasks": {
            "href": "http://localhost:8080/actuator/scheduledtasks",
            "templated": false
        },
        "httptrace": {
            "href": "http://localhost:8080/actuator/httptrace",
            "templated": false
        },
        "mappings": {
            "href": "http://localhost:8080/actuator/mappings",
            "templated": false
        }
    }
}

访问：http://localhost:8080/actuator/env

获得配置信息

访问：http://localhost:8080/actuator/beans

监控项目Spring中的beans

访问：http://localhost:8080/actuator/metrics

查看应用基本指标列表

通常不建议全部开启，因为不安全

所以，可以这样配置

#开启全部
management.endpoints.web.exposure.include=*
#开启某个
management.endpoints.web.exposure.include=metrics
#关闭某个
management.endpoints.web.exposure.exclude=metrics

SpringBoot的学习暂时结束了：

总结和未来规划：

学会了基本的配置、整合Mybatis、Redis、ActiveMQ、ElasticSearch等

技术栈的规划：

初级路线：Java基础->Java Web（html+css+js,servlet,request+response,ajax,mysql+jdbc...）->SSM、SSH->SpringBoot->Spring Cloud

高级路线：Linux->源码阅读（Spring、JDK）->数据库优化（分库分表，慢查询，调优...）->缓存（Redis集群...）->HTTP/HTTPS协议优化

                 ->安全（XSS、DDOS、CSRF）->消息队列（ActiveMQ,Kafka,RocketMQ）->搜索框架（Lucene、Solr、ElasticSearch）->Docker、K8S

下面开始Spring Cloud的学习！