写作时间：2019-08-05
Spring Boot: 2.1 ,JDK: 1.8, IDE: IntelliJ IDEA

说明

服务器都要跟数据库打交道，这里通过Actuator去检测已经加载的Beans，以及对数据库创建表，初始化数据，已经程序对数据的读取。

工程建立

参照教程【SpringBoot 2.1 | 第一篇：构建第一个SpringBoot工程】新建一个Spring Boot项目，名字叫demojdbccompose, 在目录src/main/java/resources 下找到配置文件application.properties，重命名为application.yml。

在Dependency中选择
Developer Tools > Lombok
Web > Spring Web Starter
SQL > H2 DataBase / JDBC API
Ops > Spring Boot Actuator。

配置pom.xml依赖

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

Controller处理请求

com.zgpeace.demojdbccompose.DemojdbccomposeApplication

package com.zgpeace.demojdbccompose;import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.JdbcTemplate;import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;@SpringBootApplication
@Slf4j
public class DemojdbccomposeApplication implements CommandLineRunner {@Autowiredprivate DataSource dataSource;public static void main(String[] args) {SpringApplication.run(DemojdbccomposeApplication.class, args);}@Overridepublic void run(String... args) throws Exception {showConnection();}private void showConnection() throws SQLException {log.info("dataSource >> " + dataSource.toString());Connection conn = dataSource.getConnection();log.info("conn >> " + conn.toString());conn.close();}
}

注意：DemojdbccomposeApplication需要implement 接口CommandLineRunner，才能override run方法。

打印启动信息

o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''c.z.d.DemojdbccomposeApplication         : Started DemojdbccomposeApplication in 3.986 seconds (JVM running for 4.935)
c.z.d.DemojdbccomposeApplication         : dataSource >> HikariDataSource (null)com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
c.z.d.DemojdbccomposeApplication         : conn >> HikariProxyConnection@364389956 wrapping conn0: url=jdbc:h2:mem:testdb user=SAo.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'o.s.web.servlet.DispatcherServlet        : Completed initialization in 10 ms

创建表

新建文件 resources > schema.sql

CREATE TABLE FOO (ID INT IDENTITY, BAR VARCHAR(64));

创建sql数据

新建文件 resources > data.sql

INSERT INTO FOO (ID, BAR) VALUES (1, 'aaa');
INSERT INTO FOO (ID, BAR) VALUES (2, 'bbb');

打印数据库数据

在类com.zgpeace.demojdbccompose.DemojdbccomposeApplication，添加新的内容

import org.springframework.jdbc.core.JdbcTemplate;@SpringBootApplication
@Slf4j
public class DemojdbccomposeApplication implements CommandLineRunner {@Autowiredprivate JdbcTemplate jdbcTemplate;@Overridepublic void run(String... args) throws Exception {showConnection();showData();}private void showData() {jdbcTemplate.queryForList("SELECT * FROM FOO").forEach(row -> log.info("data >> " + row.toString()));}

运行结果

c.z.d.DemojdbccomposeApplication         : data >> {ID=1, BAR=aaa}
c.z.d.DemojdbccomposeApplication         : data >> {ID=2, BAR=bbb}

查看Actuator启动项信息

配置application.yml, 开启Actuator查看更多信息

management:endpoints:web:exposure:include: '*'endpoint:health:show-details: alwaysbeans:enabled: true

查看health信息

% curl http://localhost:8080/actuator/health
{"status":"UP","details":{"db":{"status":"UP","details":{"database":"H2","hello":1}},"diskSpace":{"status":"UP","details":{"total":250790436864,"free":36456947712,"threshold":10485760}}}}%     ``> 查看metrics信息  ```shell
% curl http://localhost:8080/actuator/metrics
{"names":
["jvm.memory.max","jvm.threads.states","jdbc.connections.active","process.files.max","jvm.gc.memory.promoted","system.load.average.1m","jvm.memory.used","jvm.gc.max.data.size","jdbc.connections.max","jdbc.connections.min","jvm.gc.pause","jvm.memory.committed",
"system.cpu.count","logback.events","http.server.requests","tomcat.global.sent","jvm.buffer.memory.used","tomcat.sessions.created","jvm.threads.daemon","system.cpu.usage","jvm.gc.memory.allocated","tomcat.global.request.max","hikaricp.connections.idle","hikaricp.connections.pending",
"tomcat.global.request","tomcat.sessions.expired","hikaricp.connections","jvm.threads.live","jvm.threads.peak","tomcat.global.received","hikaricp.connections.active","hikaricp.connections.creation","process.uptime","tomcat.sessions.rejected",
"process.cpu.usage","tomcat.threads.config.max","jvm.classes.loaded","hikaricp.connections.max","hikaricp.connections.min","jvm.classes.unloaded","tomcat.global.error","tomcat.sessions.active.current","tomcat.sessions.alive.max","jvm.gc.live.data.size",
"hikaricp.connections.usage","tomcat.threads.current","hikaricp.connections.timeout","process.files.open","jvm.buffer.count","jvm.buffer.total.capacity","tomcat.sessions.active.max","hikaricp.connections.acquire","tomcat.threads.busy","process.start.time"]}%

查看启动beans信息，这里只列出了数据源相关的beans，其它省略…

{"contexts":{"application":{"beans":{"dataSource":{"aliases":[],"scope":"singleton","type":"com.zaxxer.hikari.HikariDataSource","resource":"class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]","dependencies":["spring.datasource-org.springframework.boot.autoconfigure.jdbc.DataSourceProperties"]},"jdbcTemplate":{"aliases":[],"scope":"singleton","type":"org.springframework.jdbc.core.JdbcTemplate","resource":"class path resource [org/springframework/boot/autoconfigure/jdbc/JdbcTemplateAutoConfiguration$JdbcTemplateConfiguration.class]","dependencies":[]},"transactionTemplate":{"aliases":[],"scope":"singleton","type":"org.springframework.transaction.support.TransactionTemplate","resource":"class path resource [org/springframework/boot/autoconfigure/transaction/TransactionAutoConfiguration$TransactionTemplateConfiguration.class]","dependencies":[]},"transactionManager":{"aliases":[],"scope":"singleton","type":"org.springframework.jdbc.datasource.DataSourceTransactionManager","resource":"class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceTransactionManagerAutoConfiguration$DataSourceTransactionManagerConfiguration.class]","dependencies":["spring.datasource-org.springframework.boot.autoconfigure.jdbc.DataSourceProperties"]},...

更多Actuator的信息请参考官网：Part V. Spring Boot Actuator: Production-ready features

总结

恭喜你，学会了应用Actuator查看 health。
代码下载：

https://github.com/zgpeace/Spring-Boot2.1/tree/master/db/demojdbccompose

参考

https://github.com/geektime-geekbang/geektime-spring-family
https://time.geekbang.org/course/detail/156-80191
https://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-endpoints.html

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说明