java.lang.ClassLoader.defineClass()方法的使用及代码示例

x33g5p2x  于2022-01-17 转载在 其他  
字(7.1k)|赞(0)|评价(0)|浏览(1006)

本文整理了Java中java.lang.ClassLoader.defineClass()方法的一些代码示例，展示了ClassLoader.defineClass()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ClassLoader.defineClass()方法的具体详情如下：
包路径：java.lang.ClassLoader
类名称：ClassLoader
方法名：defineClass

ClassLoader.defineClass介绍

[英]Defines a new class with the specified name, byte code from the byte buffer and the optional protection domain. If the provided protection domain is null then a default protection domain is assigned to the class.
[中]使用指定的名称、字节缓冲区中的字节代码和可选的保护域定义一个新类。如果提供的保护域为空，则会将默认保护域分配给该类。

代码示例

代码示例来源：origin: Graylog2/graylog2-server

public void defineClass(String className, byte[] bytes) {
    super.defineClass(className, bytes, 0, bytes.length);
  }
}

代码示例来源：origin: apache/geode

public Class addClass(final String className, final byte[] definition) {
  return super.defineClass(className, definition, 0, definition.length);
 }
}

代码示例来源：origin: pxb1988/dex2jar

public Class<?> xxxDefine(String type, byte[] data) {
    return super.defineClass(type, data, 0, data.length);
  }
}

代码示例来源：origin: stackoverflow.com

public static class ByteClassLoader extends URLClassLoader {
 private final Map<String, byte[]> extraClassDefs;
 public ByteClassLoader(URL[] urls, ClassLoader parent, Map<String, byte[]> extraClassDefs) {
  super(urls, parent);
  this.extraClassDefs = new HashMap<String, byte[]>(extraClassDefs);
 }
 @Override
 protected Class<?> findClass(final String name) throws ClassNotFoundException {
  byte[] classBytes = this.extraClassDefs.remove(name);
  if (classBytes != null) {
   return defineClass(name, classBytes, 0, classBytes.length); 
  }
  return super.findClass(name);
 }
}

代码示例来源：origin: voldemort/voldemort

public Class<?> loadClass(String className, byte[] classBuffer, int offset, int length) {
  Class<?> loadedClass = super.findLoadedClass(className);
  if(null == loadedClass) {
    return super.defineClass(className, classBuffer, offset, length);
  }
  return loadedClass;
}

代码示例来源：origin: robovm/robovm

/**
 * Defines a new class with the specified name, byte code from the byte
 * buffer and the optional protection domain. If the provided protection
 * domain is {@code null} then a default protection domain is assigned to
 * the class.
 *
 * @param name
 *            the expected name of the new class, may be {@code null} if not
 *            known.
 * @param b
 *            the byte buffer containing the byte code of the new class.
 * @param protectionDomain
 *            the protection domain to assign to the loaded class, may be
 *            {@code null}.
 * @return the {@code Class} object created from the data in {@code b}.
 * @throws ClassFormatError
 *             if {@code b} does not contain a valid class.
 * @throws NoClassDefFoundError
 *             if {@code className} is not equal to the name of the class
 *             contained in {@code b}.
 */
protected final Class<?> defineClass(String name, ByteBuffer b,
    ProtectionDomain protectionDomain) throws ClassFormatError {
  byte[] temp = new byte[b.remaining()];
  b.get(temp);
  return defineClass(name, temp, 0, temp.length, protectionDomain);
}

代码示例来源：origin: stackoverflow.com

public class DatabaseClassLoader extends ClassLoader {

  public DatabaseClassLoader(ClassLoader parent, ... /* connection to database */ ) {
    super(parent);
    // store the connection
  }

  public Class findClass(String name) {
    byte[] data = loadDataFromDatabase(name);
    return defineClass(name, data, 0, data.length);
  }
  private byte[] loadDataFromDatabase(String name) {
    // this is your job.
  }
}

代码示例来源：origin: stackoverflow.com

class MyClassLoader extends ClassLoader {
 @Override
 public Class<?> loadClass(String name) throws ClassNotFoundException {
  if (name is white-listed JDK class) return super.loadClass(name);
  return findClass(name);
 }
 @Override
 public Class findClass(String name) {
  byte[] b = loadClassData(name);
  return defineClass(name, b, 0, b.length);
 }
 private byte[] loadClassData(String name) {
  // load the untrusted class data here
 }
}

代码示例来源：origin: stackoverflow.com

try {
  byte[] bytes = loadClassData(s);
  return defineClass(s, bytes, 0, bytes.length);
} catch (IOException ioe) {
  try {

代码示例来源：origin: google/j2objc

getGenerator(r).generateClass(w);
byte[] b = w.toByteArray();
Class c = super.defineClass(name, b, 0, b.length, DOMAIN);
postProcess(c);
return c;

代码示例来源：origin: cglib/cglib

getGenerator(r).generateClass(w);
byte[] b = w.toByteArray();
Class c = super.defineClass(name, b, 0, b.length, DOMAIN);
postProcess(c);
return c;

代码示例来源：origin: org.easymock/easymock

getGenerator(r).generateClass(w);
byte[] b = w.toByteArray();
Class c = super.defineClass(name, b, 0, b.length, DOMAIN);
postProcess(c);
return c;

代码示例来源：origin: cglib/cglib

getGenerator(r).generateClass(w);
byte[] b = w.toByteArray();
Class c = super.defineClass(name, b, 0, b.length, DOMAIN);
postProcess(c);
return c;

代码示例来源：origin: stackoverflow.com

java.lang.NoClassDefFoundError: com/my/package/MyClass
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
  at Main$MyClassLoader.getClasses(Main.java:78)
  at Main.main(Main.java:109)
Caused by: java.lang.ClassNotFoundException: com.my.package.MyClass

代码示例来源：origin: inferred/FreeBuilder

@Override
 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
  if (name.startsWith(JAVAC_METHOD_INTROSPECTOR)) {
   String path = name.replace('.', '/').concat(".class");
   URL resource = processorLoader.getResource(path);
   try (InputStream stream = resource.openStream()) {
    byte[] bytes = ByteStreams.toByteArray(stream);
    return super.defineClass(name, bytes, 0, bytes.length);
   } catch (IOException e) {
    throw new RuntimeException(e);
   }
  } else {
   try {
    return processingEnvironmentLoader.loadClass(name);
   } catch (ClassNotFoundException e) {
    return processorLoader.loadClass(name);
   }
  }
 }
}

代码示例来源：origin: biezhi/learn-java8

@Override
  protected Class<?> findClass(String name) throws ClassNotFoundException {
    Iterator<ClassJavaFileObject> itr = files.iterator();
    while (itr.hasNext()) {
      ClassJavaFileObject file = itr.next();
      if (file.getClassName().equals(name)) {
        itr.remove();
        byte[] bytes = file.getBytes();
        return super.defineClass(name, bytes, 0, bytes.length);
      }
    }
    return super.findClass(name);
  }
}

代码示例来源：origin: stackoverflow.com

byte[] buf = new byte[10000];
  int len = is.read(buf);
  return defineClass(name, buf, 0, len);
} catch (IOException e) {
  throw new ClassNotFoundException("", e);

代码示例来源：origin: inferred/FreeBuilder

@Override
 protected Class<?> findClass(String name) throws ClassNotFoundException {
  InMemoryJavaFile classFile = javaFiles.get(FileKey.forClass(location, name, CLASS));
  if (classFile == null) {
   throw new ClassNotFoundException();
  }
  return super.defineClass(name, classFile.getBuffer(), null);
 }
};

代码示例来源：origin: inferred/FreeBuilder

@Override
 protected Class<?> findClass(String name) throws ClassNotFoundException {
  if (testFiles.contains(name.split("[$]", 0)[0])) {
   throw new ClassNotFoundException();
  }
  try {
   JavaFileObject classFile = fileManager.getJavaFileForInput(
     StandardLocation.CLASS_OUTPUT, name, CLASS);
   if (classFile == null) {
    throw new ClassNotFoundException();
   }
   byte[] bytes = ByteStreams.toByteArray(classFile.openInputStream());
   return super.defineClass(name, bytes, 0, bytes.length);
  } catch (IOException e) {
   throw new ClassNotFoundException();
  }
 }
}

代码示例来源：origin: inferred/FreeBuilder

@Override
 protected Class<?> findClass(String name) throws ClassNotFoundException {
  if (!testFiles.contains(name.split("[$]", 0)[0])) {
   return SingleBehaviorTester.class.getClassLoader().loadClass(name);
  }
  try {
   JavaFileObject classFile = fileManager.getJavaFileForInput(
     StandardLocation.CLASS_OUTPUT, name, CLASS);
   if (classFile == null) {
    throw new ClassNotFoundException();
   }
   byte[] bytes = ByteStreams.toByteArray(classFile.openInputStream());
   return super.defineClass(name, bytes, 0, bytes.length);
  } catch (IOException e) {
   throw new ClassNotFoundException();
  }
 }
}

内容来源于网络，如有侵权，请联系作者删除！

ClassLoader

相关文章

    查看更多

    热门标签

    更多
    JavaquerypythonNode开发语言requestUtil数据库Table后端算法LoggerMessageElementParser

    最新文章

    更多

    ClassLoader类方法

    • 蜀ICP备2022004421号-2 NULL123 https://www.null123.com © All rights reserved
    • 本站内容来源互联网,如果侵犯您的权益请联系我们删除, 联系方式：448109455@qq.com