Spring Boot提供了注解@Endpoint供我们定义一个端点类,并在端点类的方法上使用@ReadOperation注解来显示监控信息(对应Get请求),使用@WriteOperation来动态更新监控信息(对应Post请求,可以是rest-client-master访问)。
自定义端点(演示显示数据源的相关信息) 1.创建基于Spring Data JPA和Spring Boot Actuator的Web应用ch10_2 2.修改pom.xml文件添加MySQL依赖 3.配置数据源 4.自定义端点 5.暴露端点 6.测试端点
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.endpoint</groupId> <artifactId>SpringBootEndPoint</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <properties> <!-- 声明项目配置依赖编码格式为 utf-8 --> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <fastjson.version>1.2.24</fastjson.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <!-- 添加MySQL依赖 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> <version>8.0.13</version><!--$NO-MVN-MAN-VER$ --> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>
spring.datasource.url=jdbc:mysql://localhost:3306/springbootjpa?serverTimezone=UTC&autoReconnect=true spring.datasource.username=root spring.datasource.password=admin spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.jpa.database=MYSQL spring.jpa.show-sql=true spring.jpa.hibernate.ddl-auto=update spring.jackson.serialization.indent-output=true management.endpoints.web.exposure.include=* management.endpoint.health.show-details=always
package com.ch.ch10_2.endPoint; import java.util.HashMap; import java.util.Map; import org.springframework.boot.actuate.endpoint.annotation.Endpoint; import org.springframework.boot.actuate.endpoint.annotation.ReadOperation; import org.springframework.boot.actuate.endpoint.annotation.WriteOperation; import org.springframework.stereotype.Component; import com.zaxxer.hikari.HikariConfigMXBean; import com.zaxxer.hikari.HikariDataSource; import com.zaxxer.hikari.HikariPoolMXBean; //注册为端点,id不能使用驼峰法(dataSource),需要以-分割 @Endpoint(id = "data-source") @Component public class DataSourceEndpoint { // HikariDataSource提供多个监控信息 HikariDataSource ds; public DataSourceEndpoint(HikariDataSource ds) { this.ds = ds; } @ReadOperation public Map<String, Object> info() { Map<String, Object> map = new HashMap<String, Object>(); // 连接池配置 HikariConfigMXBean configBean = ds.getHikariConfigMXBean(); map.put("max", configBean.getMaximumPoolSize()); // 连接池运行状态 HikariPoolMXBean mxBean = ds.getHikariPoolMXBean(); map.put("active", mxBean.getActiveConnections()); map.put("idle", mxBean.getIdleConnections()); // 连接池无连接时,等待获取连接的线程个数 map.put("wait", mxBean.getThreadsAwaitingConnection()); return map; } @WriteOperation public void setMax(int max) { ds.getHikariConfigMXBean().setMaximumPoolSize(max); } }
5.暴露端点 在配置文件application.properties中暴露端点,内容如下: #暴露所有端点,当然包括data-source,我们也可以只暴露data-source端点 management.endpoints.web.exposure.include=*
package com.ch.ch10_2; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Ch102Application { public static void main(String[] args) { SpringApplication.run(Ch102Application.class, args); } }
6.测试端点 首先,启动应用程序主类Ch102Application,然后通过“http://localhost:8080/actuator/data-source”测试端点data-source
使用rest-client-master发送POST请求“http://localhost:8080/actuator/data-source?max=20” POST请求“http://localhost:8080/actuator/data-source?max=20”执行后,“http://localhost:8080/actuator/data-source”测试端点data-source