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%\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

<?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