core/src/main/java/com/taobao/arthas/core/advisor/Enhancer.java [294:318]:
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    private static void dumpClassIfNecessary(String className, byte[] data, EnhancerAffect affect) {
        if (!GlobalOptions.isDump) {
            return;
        }
        final File dumpClassFile = new File("./arthas-class-dump/" + className + ".class");
        final File classPath = new File(dumpClassFile.getParent());

        // 创建类所在的包路径
        if (!classPath.mkdirs() && !classPath.exists()) {
            logger.warn("create dump classpath:{} failed.", classPath);
            return;
        }

        // 将类字节码写入文件
        try {
            FileUtils.writeByteArrayToFile(dumpClassFile, data);
            affect.addClassDumpFile(dumpClassFile);
            if (GlobalOptions.verbose) {
                logger.info("dump enhanced class: {}, path: {}", className, dumpClassFile);
            }
        } catch (IOException e) {
            logger.warn("dump class:{} to file {} failed.", className, dumpClassFile, e);
        }

    }
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labs/arthas-grpc-web-proxy/src/main/java/com/taobao/arthas/grpcweb/grpc/service/advisor/Enhancer.java [280:304]:
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    private static void dumpClassIfNecessary(String className, byte[] data, EnhancerAffect affect) {
        if (!GlobalOptions.isDump) {
            return;
        }
        final File dumpClassFile = new File("./arthas-class-dump/" + className + ".class");
        final File classPath = new File(dumpClassFile.getParent());

        // 创建类所在的包路径
        if (!classPath.mkdirs() && !classPath.exists()) {
            logger.warn("create dump classpath:{} failed.", classPath);
            return;
        }

        // 将类字节码写入文件
        try {
            FileUtils.writeByteArrayToFile(dumpClassFile, data);
            affect.addClassDumpFile(dumpClassFile);
            if (GlobalOptions.verbose) {
                logger.info("dump enhanced class: {}, path: {}", className, dumpClassFile);
            }
        } catch (IOException e) {
            logger.warn("dump class:{} to file {} failed.", className, dumpClassFile, e);
        }

    }
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