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-java17-22.3.0JAVA_HOME: %GRAALVM_HOME%PATH: %GRAALVM_HOME%\bin

cmd(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

<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/>     </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@RequestMappingpublic 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 imagesdemo6                      0.0.1-SNAPSHOT   f025642103bf   43 years ago    96.8MBC:\Windows\system32> docker run -di -p 8080:8080 demo6:0.0.1-SNAPSHOTC:\Windows\system32>docker statsCONTAINER ID   NAME              CPU %     MEM USAGE / LIMIT     MEM %     NET I/O           BLOCK I/O   PIDS159c9bd5f0dc   jolly_hellman     0.01%     47.51MiB / 25.01GiB   0.19%     1.98kB / 538B     0B / 0B     18PS 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 WebApplicationContext2022-12-21T07:19:43.983Z  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 12 ms2022-12-21T07:19:43.997Z  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