GraalVM Native + Base64 编解码命令行小工具开发
- 初衷：
- 浏览 V 站 帖子有很多 Base64 加密的信息，希望能够快速解密。
- 实现：
v1：直接使用 JShell 命令行运行 Java 代码解密
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ant@ant:~$ jshell | Welcome to JShell -- Version 17.0.9 | For an introduction type: /help intro jshell> var enc = "c2F2ZW9sZQ==" enc ==> "c2F2ZW9sZQ==" jshell> var decodedBytes = Base64.getDecoder().decode(enc.getBytes()) decodedBytes ==> byte[8] { 115, 97, 118, 101, 95, 111, 108, 101 } jshell> new String(decodedBytes) $3 ==> "saveole"
v2：GraalVM Native 的方式将 Java 程序编译打包成可执行文件小工具
原 Java 程序：
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import java.util.Base64; public class Base64Tool { static String helpMsg = """ -e Encode input string -d Decode input string """;; public static void main(String[] args) { if (args == null || args.length == 0) { System.err.println(helpMsg); System.exit(1); } var arg = args[0]; switch(arg) { case "-help": System.out.println(helpMsg); break; case "-e": var toEncode = getAndCheckArg(args); System.out.println(new String(Base64.getEncoder().encode(toEncode.getBytes()))); break; case "-d": var toDecode = getAndCheckArg(args); System.out.println(new String(Base64.getDecoder().decode(toDecode.getBytes()))); break; default: System.err.println("Unknown command, use -help to see how to use this tool."); break; } System.exit(1); } static String getAndCheckArg(String[] args) { if (args == null || args.length < 2) { System.err.println("Please input valid string"); System.exit(0); } return args[1]; } }
使用 native-image 编译构建可执行程序
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ant@ant:~/native$ javac Base64Tool.java ant@ant:~/native$ native-image Base64Tool ======================================================================================================================== GraalVM Native Image: Generating 'base64tool' (executable)... ======================================================================================================================== [1/8] Initializing... (1.7s @ 0.14GB) Java version: 17.0.9+9, vendor version: GraalVM CE 17.0.9+9.1 Graal compiler: optimization level: 2, target machine: x86-64-v3 C compiler: gcc (linux, x86_64, 11.4.0) Garbage collector: Serial GC (max heap size: 80% of RAM) [2/8] Performing analysis... [****] (4.4s @ 0.27GB) 2,912 (71.67%) of 4,063 types reachable 3,536 (50.94%) of 6,942 fields reachable 13,209 (43.86%) of 30,116 methods reachable 907 types, 0 fields, and 348 methods registered for reflection 58 types, 58 fields, and 52 methods registered for JNI access 4 native libraries: dl, pthread, rt, z [3/8] Building universe... (0.9s @ 0.30GB) [4/8] Parsing methods... [*] (0.6s @ 0.32GB) [5/8] Inlining methods... [***] (0.5s @ 0.22GB) [6/8] Compiling methods... [**] (4.5s @ 0.35GB) [7/8] Layouting methods... [*] (0.7s @ 0.37GB) [8/8] Creating image... [*] (1.1s @ 0.38GB) 4.42MB (36.75%) for code area: 7,506 compilation units 7.04MB (58.46%) for image heap: 89,275 objects and 5 resources 590.55kB ( 4.79%) for other data 12.03MB in total ------------------------------------------------------------------------------------------------------------------------ Top 10 origins of code area: Top 10 object types in image heap: 3.37MB java.base 1009.70kB byte[] for code metadata 795.13kB svm.jar (Native Image) 889.53kB java.lang.String 112.32kB java.logging 836.32kB byte[] for general heap data 62.07kB org.graalvm.nativeimage.base 671.94kB java.lang.Class 24.15kB jdk.internal.vm.ci 665.65kB byte[] for java.lang.String 23.14kB org.graalvm.sdk 347.48kB java.util.HashMap$Node 6.11kB jdk.internal.vm.compiler 250.25kB com.oracle.svm.core.hub.DynamicHubCompanion 1.68kB Base64Tool 169.02kB java.lang.String[] 1.35kB jdk.proxy1 165.57kB java.lang.Object[] 1.27kB jdk.proxy3 148.84kB byte[] for embedded resources 1.56kB for 2 more packages 1.20MB for 829 more object types ------------------------------------------------------------------------------------------------------------------------ Recommendations: HEAP: Set max heap for improved and more predictable memory usage. CPU: Enable more CPU features with '-march=native' for improved performance. ------------------------------------------------------------------------------------------------------------------------ 0.7s (4.3% of total time) in 164 GCs | Peak RSS: 0.84GB | CPU load: 8.21 ------------------------------------------------------------------------------------------------------------------------ Produced artifacts: /home/ant/native/base64tool (executable) ======================================================================================================================== Finished generating 'base64tool' in 14.8s.
使用
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ant@ant:~/native$ ./base64tool -help -e Encode input string -d Decode input string ant@ant:~/native$ ./base64tool -e saveole c2F2ZW9sZQ== ant@ant:~/native$ ./base64tool -d c2F2ZW9sZQ== saveole ant@ant:~/native$
- 注意事项
- 使用 native-image 构建可执行程序时，需要注意当前的执行目录。它默认会扫描当前目录及子目录下的所有文件(不能区分 Java 程序相关的文件)，导致构建失败。建议在单独的文件夹中进行编译构建。
This post is licensed under CC BY 4.0 by the author.