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服务器之家 - 编程语言 - Java教程 - SpringCloud的@RefreshScope 注解你了解吗

SpringCloud的@RefreshScope 注解你了解吗

2021-12-24 12:10小布1994 Java教程

这篇文章主要介绍了Spring Cloud @RefreshScope 原理及使用，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

spring-boot-starter-actuator提供服务健康检查和暴露内置的url接口。

spring-cloud-starter-config提供动态刷新的一些支持和注解。

 

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
       xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.4.6</version>
      <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.xiaobu</groupId>
  <artifactId>demo-for-mybatis-plus</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>demo-for-mybatis-plus</name>
  <description>demo-for-mybatis-plus</description>
  <properties>
      <java.version>1.8</java.version>
      <spring-cloud.version>2020.0.3</spring-cloud.version>
  </properties>
  <dependencies>
      <!--spring boot-->
      <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>
          <exclusions>
              <exclusion>
                  <artifactId>asm</artifactId>
                  <groupId>org.ow2.asm</groupId>
              </exclusion>
          </exclusions>
      </dependency>
      <dependency>
          <groupId>com.baomidou</groupId>
          <artifactId>mybatis-plus-boot-starter</artifactId>
          <version>3.4.2</version>
      </dependency>
      <!-- lomback -->
      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <version>1.16.10</version>
      </dependency>
      <dependency>
          <groupId>cn.hutool</groupId>
          <artifactId>hutool-all</artifactId>
          <version>5.3.2</version>
      </dependency>
      <!-- 引入Swagger2依赖 -->
      <dependency>
          <groupId>io.springfox</groupId>
          <artifactId>springfox-swagger2</artifactId>
          <version>2.9.2</version>
          <exclusions>
              <exclusion>
                  <artifactId>guava</artifactId>
                  <groupId>com.google.guava</groupId>
              </exclusion>
          </exclusions>
      </dependency>
      <dependency>
          <groupId>io.springfox</groupId>
          <artifactId>springfox-swagger-ui</artifactId>
          <version>2.9.2</version>
      </dependency>
      <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
      <dependency>
          <groupId>com.google.guava</groupId>
          <artifactId>guava</artifactId>
          <version>29.0-jre</version>
      </dependency>
      <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>easyexcel</artifactId>
          <version>2.0.2</version>
      </dependency>
      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
      </dependency>

      <dependency>
          <groupId>com.xuxueli</groupId>
          <artifactId>xxl-job-core</artifactId>
          <version>2.3.0</version>
      </dependency>
      <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
      </dependency>
      <!--   spring-cloud config-->
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-config</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-actuator</artifactId>
      </dependency>
      <!--        springcloud 高版本需要引入 spring-cloud-starter-bootstrap 否则刷新不起效-->
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-bootstrap</artifactId>
      </dependency>
  </dependencies>

  <dependencyManagement>
      <dependencies>
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-dependencies</artifactId>
              <version>${spring-cloud.version}</version>
              <type>pom</type>
              <scope>import</scope>
          </dependency>
      </dependencies>
  </dependencyManagement>


  <build>
      <resources>
          <resource>
              <directory>src/main/resources</directory>
          </resource>
          <resource>
              <directory>src/main/java</directory>
              <includes>
                  <include>**/*.xml</include>
              </includes>
              <filtering>true</filtering>
          </resource>
      </resources>
      <finalName>App</finalName>
      <plugins>
          <plugin>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-maven-plugin</artifactId>
              <version>2.4.5</version>
          </plugin>
      </plugins>
  </build>

</project>

 

properties

########## Mybatis 自身配置 ##########
logging.level.com.xiaobu=debug
mybatis-plus.type-aliases-package=com.xiaobu.entity
mybatis-plus.mapper-locations=classpath:com/xiaobu/mapper/xml/*.xml
# 控制台打印sql 带参数 无法写入文件
#mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl
# 将sql 写入文件 带参数
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.slf4j.Slf4jImpl
#集成mysql数据库的配置
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/master0?useSSL=false&useUnicode=true&characterEncoding=utf-8&autoReconnect=true&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root
#测试动态刷新配置
order.pay-timeout-seconds=9999
order.create-frequency-seconds=600
#暴露内置的刷新配置文件url，这个必须写，否则无法刷新配置文件
management.endpoints.web.exposure.include=refresh
#management.endpoints.web.exposure.include=env,refresh#management.endpoints.web.exposure.include=env,refresh

 

启动类

package com.xiaobu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationPropertiesScan;

/**
* @author 小布
*/
@SpringBootApplication
@ConfigurationPropertiesScan
public class DemoForMybatisPlusApplication {

  public static void main(String[] args) {
      SpringApplication.run(DemoForMybatisPlusApplication.class, args);
  }

}

 

配置类

package com.xiaobu.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;

/**
* @author 小布
*/
@Component
@ConfigurationProperties(prefix = "order")
@RefreshScope
@Data
public class OrderProperties {
  /**
   * 订单支付超时时长，单位：秒。
   */
  private Integer payTimeoutSeconds;

  /**
   * 订单创建频率，单位：秒
   */
  private Integer createFrequencySeconds;

}

 

controller

package com.xiaobu.controller;

import com.xiaobu.config.OrderProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
* The type Refresh controller.
*
* @author 小布
* @version 1.0.0
* @className RefreshController.java
* @createTime 2021年09月06日 15:38:00
*/
@RestController
@RequestMapping("refresh")
@RefreshScope
public class RefreshController {

  @Autowired
  private OrderProperties orderProperties;

  @Value(value = "${order.pay-timeout-seconds}")
  private Integer payTimeoutSeconds;

  /**
   * Test string.
   *
   * @return the string
   */
  @GetMapping("test")
  public String test() {
      return "payTimeoutSeconds:" + payTimeoutSeconds;
  }

  @GetMapping("test01")
  public String test01() {
      return orderProperties.toString();
  }
}

 

打包

执行

mvn clean package -Dmaven.test.skip=true

cmd启动jar 并指定外部配置文件

java -jar App.jar  --spring.config.location=D:/application.properties

访问：http://localhost:8080/refresh/test

SpringCloud的@RefreshScope 注解你了解吗

修改配置文件内容:

SpringCloud的@RefreshScope 注解你了解吗

执行 POST http://localhost:8080/actuator/refresh

SpringCloud的@RefreshScope 注解你了解吗

再次访问：http://localhost:8080/refresh/test

SpringCloud的@RefreshScope 注解你了解吗

访问：http://localhost:8080/refresh/test01

SpringCloud的@RefreshScope 注解你了解吗

 

springcloud对应的springboot版本

SpringCloud的@RefreshScope 注解你了解吗

SpringCloud的@RefreshScope 注解你了解吗

 

参考:

springcloud对应的springboot版本

Spring boot 应用实现动态刷新配置

Spring Boot 指定外部启动配置文件

总结

本篇文章就到这里了，希望能够给你带来帮助，也希望您能够多多关注服务器之家的更多内容！

原文链接：https://blog.csdn.net/tanhongwei1994/article/details/120147010

  • 注解
  • SpringCloud
  • RefreshScope

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