SpringBoot教程(四)开发环境springboot的热加载和热部署

比眉伴天荒 2022-04-11 12:06 208阅读 0赞

> ## **为了避免每次改动后重新启动的繁琐引入spring的热加载和热部署** ##

>  一.SpringBoot热部署的原理
> 
>        spring-boot-devtools是一个为开发者服务的一个模块，其中最重要的功能就是自动应用代码更改到最新的App上面去。原理是在发现代码有更改之后，重新启动应用，但是比速度比手动停止后再启动还要更快，更快指的不是节省出来的手工操作的时间。其深层原理是使用了两个ClassLoader，一个Classloader加载那些不会改变的类（第三方Jar包），另一个ClassLoader加载会更改的类，称为  restart ClassLoader,这样在有代码更改的时候，原来的restartClassLoader 被丢弃，重新创建一个restartClassLoader，由于需要加载的类相比较少，所以实现了较快的重启时间（5秒以内）

二.SpringBoot热加载和热部署的配置

1.整体pom结构

<?xml version="1.0" encoding="UTF-8"?>
    <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.lpinfo.shop</groupId>
    	<artifactId>lpinfo-shop</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>lpinfo-shop</name>
    	<description>Demo project for Spring Boot</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.1.1.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-thymeleaf</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-devtools</artifactId>
    			<optional>true</optional>
    		</dependency>
    
    		<dependency>
    			<groupId>mysql</groupId>
    			<artifactId>mysql-connector-java</artifactId>
    			<version>5.1.45</version>
    		</dependency>
    
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    				<configuration>
    					<fork>true</fork>
    				</configuration>
    				<dependencies>
    					<dependency>
    						<groupId>org.springframework</groupId>
    						<artifactId>springloaded</artifactId>
    						<version>1.2.0.M1</version>
    					</dependency>
    				</dependencies>
    			</plugin>
    		</plugins>
    	</build>
    
    
    </project>

2.applicaation.yml配置

>   ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxODI3MjQ1NTYz_size_16_color_FFFFFF_t_70][]
> 
>    \#热部署生效  
>    spring.devtools.restart.enabled=true  
>    \#设置重启的目录，检索目录(resources/static、resources/templates)  
>    spring.devtools.restart.additional-paths= src/main/java  
>    \#classpath目录下的WEB-INF文件夹内容修改不重启  
>    \#spring.devtools.restart.exclude= WEB-INF/\*\*  
>

三.开发工具需要配置的地方

1.idea工具配置

file-setting->如下![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxODI3MjQ1NTYz_size_16_color_FFFFFF_t_70 1][]

执行快捷键 shift+ctrl+alt+/

![20181206112846216.png][]

进入Registry选择

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxODI3MjQ1NTYz_size_16_color_FFFFFF_t_70 2][]

重启Idea测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxODI3MjQ1NTYz_size_16_color_FFFFFF_t_70 3][]

2.eclipse配置

参考:[https://blog.csdn.net/qq\_29379115/article/details/78983169][https_blog.csdn.net_qq_29379115_article_details_78983169]

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[20181206112846216.png]: /images/20220411/4feda41d892b46d5a5f54bbf30c1db95.png
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[https_blog.csdn.net_qq_29379115_article_details_78983169]: https://blog.csdn.net/qq_29379115/article/details/78983169