SpringBoot改动后0.03秒启动
一、概述
GraalVM 是一种高性能运行时，可显着提高应用程序性能和效率，非常适合微服务. 对于 Java 程序 GraalVM 负责将 Java 字节码编译成机器码，映像生成过程使用静态分析来查找可从主 Java 方法访问的任何代码，然后执行完全提前 (AOT) 编译。生成的本机二进制文件包含机器代码形式的整个程序，以便立即执行。
二、环境准备
下载 GraalVM : https://www.graalvm.org/downloads/，需要选择Java 17版本，下载完成后解压配置java环境变量
GRAALVM_HOME: D:\devops\graalvm-ce-java17-22.3.0
JAVA_HOME: %GRAALVM_HOME%
PATH: %GRAALVM_HOME%\bincmd(不要使用powershell，powershell可能回报错) 运行 gu install native-image
三、创建SpringBoot项目
SDK选择17
pom文件如下，都是自动生成的，没有修改
<?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 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>3.0.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo6</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo6</name>
<description>demo6</description>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<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>
<groupId>org.graalvm.buildtools</groupId>
<artifactId>native-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
创建IndexController，内容如下：
@RestController
@RequestMapping
public class IndexController {
@RequestMapping("/")
public String test(){
return "spring-native";
}
}四、打包镜像
在项目目录里启动cmd，输入命令
mvn clean -U -DskipTests -Pnative spring-boot:build-image运行命令：
C:\Windows\system32>docker images
demo6 0.0.1-SNAPSHOT f025642103bf 43 years ago 96.8MB
C:\Windows\system32> docker run -di -p 8080:8080 demo6:0.0.1-SNAPSHOT
C:\Windows\system32>docker stats
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
159c9bd5f0dc jolly_hellman 0.01% 47.51MiB / 25.01GiB 0.19% 1.98kB / 538B 0B / 0B 18
PS D:\devops\java-project\demo6> docker logs -f 159c9bd5f0dc
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v3.0.0)
2022-12-21T07:19:43.970Z INFO 1 --- [ main] com.example.demo.Demo6Application : Starting AOT-processed Demo6Application using Java 17.0.5 with PID 1 (/workspace/com.example.demo.Demo6Application started by cnb in /workspace)
2022-12-21T07:19:43.971Z INFO 1 --- [ main] com.example.demo.Demo6Application : No active profile set, falling back to 1 default profile: "default"
2022-12-21T07:19:43.979Z INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-12-21T07:19:43.980Z INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-12-21T07:19:43.980Z INFO 1 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.1]
2022-12-21T07:19:43.983Z INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-12-21T07:19:43.983Z INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 12 ms
2022-12-21T07:19:43.997Z INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-12-21T07:19:43.997Z INFO 1 --- [ main] com.example.demo.Demo6Application : Started Demo6Application in 0.032 seconds (process running for 0.034)
2022-12-21T07:20:13.975Z INFO 1 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-12-21T07:20:13.975Z INFO 1 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-12-21T07:20:13.976Z INFO 1 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
可以看出使用native，打出的包为96M，运行内存47M，启动时间0.032S，占用资源和启动速度方面还是非常有优势的
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