protected Class<?> loadClass(String name, boolean resolve)
        throws ClassNotFoundException
    {
        synchronized (getClassLoadingLock(name)) {
            // First, check if the class has already been loaded
            Class<?> c = findLoadedClass(name);
            if (c == null) {
                long t0 = System.nanoTime();
                try {
                    if (parent != null) {
                        c = parent.loadClass(name, false);
                    } else {
                        c = findBootstrapClassOrNull(name);
                    }
                } catch (ClassNotFoundException e) {
                    // ClassNotFoundException thrown if class not found
                    // from the non-null parent class loader
                }
 
                if (c == null) {
                    // If still not found, then invoke findClass in order
                    // to find the class.
                    long t1 = System.nanoTime();
                    c = findClass(name);
 
                    // this is the defining class loader; record the stats
                    sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0);
                    sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1);
                    sun.misc.PerfCounter.getFindClasses().increment();
                }
            }
            if (resolve) {
                resolveClass(c);
            }
            return c;
        }
    }

public class DynamicClassLoader extends ClassLoader {
 
    private static final String CLASS_EXTENSION = "class";
 
    @Override
    public Class<?> findClass(String encryptClassInfo) {
        EncryptClassInfo info = JSON.parseObject(encryptClassInfo, EncryptClassInfo.class);
        String filePath = info.getAbsoluteFilePath();
        String systemPath = System.getProperty("java.io.tmpdir");
        String normalizeFileName = FilenameUtils.normalize(filePath, true);
        if (StringUtils.isEmpty(normalizeFileName) || !normalizeFileName.startsWith(systemPath)
                ||getApkFileExtension(normalizeFileName) == null
                || !CLASS_EXTENSION.equals(getApkFileExtension(normalizeFileName))) {
            return null;
        }
 
        String className = info.getEncryptClassName();
        byte[] classBytes = null;
        File customEncryptFile = new File(filePath);
        try {
            Path path = Paths.get(customEncryptFile.toURI());
            classBytes = Files.readAllBytes(path);
        } catch (IOException e) {
            log.info("加密錯(cuò)誤", e);
        }
        if (classBytes != null) {
            return defineClass(className, classBytes, 0, classBytes.length);
        }
        return null;
    }
 
    private static String getApkFileExtension(String fileName) {
        int index = fileName.lastIndexOf(".");
        if (index != -1) {
            return fileName.substring(index + 1);
        }
        return null;
    }
}

public String encrypt(String rawString) {
        String keyString = "R.string.0x7f050001";
        byte[] enByte = encryptField(keyString, rawString.getBytes());
        return Base64.encode(enByte);
    }

public class EncryptStringHandler {
 
    private static final Map<String, Class<?>> classMameMap = new HashMap<>();
 
    @Autowired
    private VivofsFileHelper vivofsFileHelper;
 
    @Autowired
    private DynamicClassLoader dynamicClassLoader;
 
    public String encryptString(String fileId, String encryptClassName, String fileContent) {
        try {
            Class<?> clazz = obtainEncryptClass(fileId, encryptClassName);
            Object obj = clazz.newInstance();
            Method method = clazz.getMethod("encrypt", String.class);
            String encryptStr = (String) method.invoke(obj, fileContent);
            log.info("原字符串為:{},加密后的字符串為:{}", fileContent, encryptStr);
            return encryptStr;
        } catch (Exception e) {
            log.error("自定義加載器加載加密類異常", e);
            return null;
        }
    }
 
    private Class<?> obtainEncryptClass(String fileId, String encryptClassName) {
        Class<?> clazz = classMameMap.get(encryptClassName);
        if (clazz != null) {
            return clazz;
        }
        String absoluteFilePath = null;
        try {
            String domain = VivoConfigManager.getString("vivofs.host");
            String fullPath = domain + "/" + fileId;
            File classFile = vivofsFileHelper.downloadFileByUrl(fullPath);
            absoluteFilePath = classFile.getAbsolutePath();
            EncryptClassInfo encryptClassInfo = new EncryptClassInfo(encryptClassName, absoluteFilePath);
            String info = JSON.toJSONString(encryptClassInfo);
            clazz = dynamicClassLoader.findClass(info);
            //設(shè)置緩存
            Assert.notNull(clazz, "自定義類加載器加載加密類異常");
            classMameMap.put(encryptClassName, clazz);
            return clazz;
        } finally {
            if (absoluteFilePath != null) {
                FileUtils.deleteQuietly(new File(absoluteFilePath));
            }
        }
    }
}

protected Class<?> loadClass(String name, boolean resolve)
        throws ClassNotFoundException
    {
        synchronized (getClassLoadingLock(name)) {
            // First, check if the class has already been loaded
            Class<?> c = findLoadedClass(name);
            if (c == null) {
                long t0 = System.nanoTime();
                try {
                    if (parent != null) {
                        c = parent.loadClass(name, false);
                    } else {
                        c = findBootstrapClassOrNull(name);
                    }
                } catch (ClassNotFoundException e) {
                    // ClassNotFoundException thrown if class not found
                    // from the non-null parent class loader
                }
 
                if (c == null) {
                    // If still not found, then invoke findClass in order
                    // to find the class.
                    long t1 = System.nanoTime();
                    c = findClass(name);
 
                    // this is the defining class loader; record the stats
                    sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0);
                    sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1);
                    sun.misc.PerfCounter.getFindClasses().increment();
                }
            }
            if (resolve) {
                resolveClass(c);
            }
            return c;
        }
    }

@Slf4j
@Component
public class Test implements ApplicationListener<ContextRefreshedEvent> {
 
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        log.info("classLoader DynamicClassLoader:" + DynamicClassLoader.class.getClassLoader().toString());
    }
}

public DynamicClassLoader() {
        super(DynamicClassLoader.class.getClassLoader());
}

public String encrypt(String rawString) {
        log.info("classLoader Base64:{}", Base64.class.getClassLoader().toString());
        String keyString = "R.string.0x7f050001";
        byte[] enByte = encryptField(keyString, rawString.getBytes());
        return Base64.encode(enByte);
    }

public String encrypt(String rawString) {
        System.out.println("類加載器詳情...");
        System.out.println("classLoader EncryptStrategyHandler:" + EncryptStrategyHandlerH.class.getClassLoader().toString());
        System.out.println("classLoader EncryptStrategyHandler:" + EncryptStrategyHandlerH.class.getClassLoader().getParent().toString());
        String classPath = System.getProperty("java.class.path");
        System.out.println("classPath:" + classPath);
        System.out.println("classLoader Base64:" + Base64.class.getClassLoader().toString());
        String keyString = "R.string.0x7f050001";
        byte[] enByte = encryptField(keyString, rawString.getBytes());
        return Base64.encode(enByte);
    }