SpringBoot热部署详解

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目录

• 🍁前言
• 🍁为什么要使用热部署
• 🍁手动启动热部署
• 🍁自动启动热部署
• 🍁热部署范围配置
• 🍁禁用热部署

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🍁前言

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🍁为什么要使用热部署

🔥关于热部署：

• 重启（Restart)∶自定义开发代码，包含类、页面、配置文件等，加载位置restart类加载器
• 重载（ReLoad) : jar包，加载位置base类加载器

🍁手动启动热部署

🔥导入坐标 - 启动开发者工具

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

🔥修改数据

方便测试是否启用了热部署：
详细代码：点击直接查看

 @GetMapping("{id}")
    public R getById(@PathVariable Integer id){
        System.out.println("host deploy...");
        System.out.println("host deploy...");
        System.out.println("host deploy...");
        return new R(true, bookService.getById(id));
    }

🔥build project

🔥测试

🍁自动启动热部署

🍁热部署范围配置

如果想要某些文件或者文件夹不参与热部署的配置需要在application.xml中配置以下信息：

# 设置不参与热部署的文件或文件夹
devtools:
  restart:
    exclude: static/**,public/**,config/application.yml

🍁禁用热部署

🔥方式一

在application.yml中配置:

# 设置不参与热部署的文件或文件夹
devtools:
  restart:
    exclude: static/**,public/**,config/application.yml
    enabled: false

这种形式关闭热部署，优先级别太低，可能关闭之后，别人又从别的配置文件或者其他地方给打开了（在优先级别高的地方），从而导致热部署在此启动.

🔥方式二

🔥在优先级别高的地方禁用热部署。

• 属性加载优先顺序：由低到高
  • 1 Default properties (specified by setting springApplication.setDefaultproperties )
  • 2 GPropertySsource annotations on your @Cconfiguration classes. Please note that such property sources are not added to theEnvironment until the application context is being refreshed.This is too late to configure certain properties such as logging.* and spring.main.* which are read before refresh begins.
  • 3 Config data (such as application.properties files)
  • 4 A RandomValuePropertySource that has properties only in random.* .
  • 5 OS environment variables.
  • 6 Java System properties ( system.getProperties() ).
  • 7 JNDl attributes from java:comp/env .
  • 8 ServletContext init parameters.
  • 9 Servletconfig init parameters.
  • 10 Properties from spRING_APpLICATION_soN (inline JSON embedded in an environment variable or system property).
  • 11 Command line arguments.
  • 12 properties attribute on your tests.Available on gSpringRootTest and the test annotations for testing a particular slice ofyour application.
  • 13 @TestPropertySource annotations on your tests.
  • 14 Devtools global settings properties in the SHN’E .config/spring-boot directory when devtools ,s.ati

🔥application.yml配置文件在优先级为3的地方,可以在优先级为6的地方禁用热部署功能：

package com.jkj;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootHotDeployApplication {
    public static void main(String[] args) {
        System.setProperty("spring.devtools.restart.enabled","false");
        SpringApplication.run(SpringbootHotDeployApplication.class);
    }

}