org.apache.log4j.helpers.Loader.loadClass()方法的使用及代码示例

x33g5p2x  于2022-01-24 转载在 其他  
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本文整理了Java中org.apache.log4j.helpers.Loader.loadClass()方法的一些代码示例，展示了Loader.loadClass()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。Loader.loadClass()方法的具体详情如下：
包路径：org.apache.log4j.helpers.Loader
类名称：Loader
方法名：loadClass

Loader.loadClass介绍

[英]If running under JDK 1.2 load the specified class using the Thread``contextClassLoader if that fails try Class.forname. Under JDK 1.1 only Class.forName is used.
[中]如果在JDK 1.2下运行，请使用Thread``contextClassLoader加载指定的类，如果失败，请尝试类。forname。仅在JDK1.1类下。使用forName。

代码示例

代码示例来源：origin: log4j/log4j

  1. private
  2. void readLevel(ObjectInputStream ois)
  3.           throws java.io.IOException, ClassNotFoundException {
  4.  int p = ois.readInt();
  5.  try {
  6.   String className = (String) ois.readObject();
  7.   if(className == null) {
  8.  level = Level.toLevel(p);
  9.   } else {
  10.  Method m = (Method) methodCache.get(className);
  11.  if(m == null) {
  12.   Class clazz = Loader.loadClass(className);
  13.   // Note that we use Class.getDeclaredMethod instead of
  14.   // Class.getMethod. This assumes that the Level subclass
  15.   // implements the toLevel(int) method which is a
  16.   // requirement. Actually, it does not make sense for Level
  17.   // subclasses NOT to implement this method. Also note that
  18.   // only Level can be subclassed and not Priority.
  19.   m = clazz.getDeclaredMethod(TO_LEVEL, TO_LEVEL_PARAMS);
  20.   methodCache.put(className, m);
  21.  }
  22.  PARAM_ARRAY[0] = new Integer(p);
  23.  level = (Level) m.invoke(null,  PARAM_ARRAY);
  24.   }
  25.  } catch(Exception e) {
  26.  LogLog.warn("Level deserialization failed, reverting to default.", e);
  27.  level = Level.toLevel(p);
  28.  }
  29. }

代码示例来源：origin: log4j/log4j

  1. Method m = (Method) methodCache.get(className);
  2. if(m == null) {
  3.  Class clazz = Loader.loadClass(className);

代码示例来源：origin: log4j/log4j

  1. LogLog.debug("Parsing layout of class: \""+className+"\"");		 
  2. try {
  3.  Object instance     = Loader.loadClass(className).newInstance();
  4.  Layout layout       = (Layout)instance;
  5.  PropertySetter propSetter = new PropertySetter(layout);

代码示例来源：origin: log4j/log4j

  1. LogLog.debug("Parsing throwableRenderer of class: \""+className+"\"");
  2. try {
  3.  Object instance     = Loader.loadClass(className).newInstance();
  4.  ThrowableRenderer tr       = (ThrowableRenderer)instance;
  5.  PropertySetter propSetter = new PropertySetter(tr);

代码示例来源：origin: log4j/log4j

  1. if (converterObj instanceof String) {
  2.  try {
  3.   converterClass = Loader.loadClass((String) converterObj);
  4.  } catch (ClassNotFoundException ex) {
  5.    LogLog.warn(

代码示例来源：origin: log4j/log4j

  1. LogLog.debug("Desired Level sub-class: ["+className+']');
  2. try {	 
  3.  Class clazz = Loader.loadClass(className);
  4.  Method toLevelMethod = clazz.getMethod("toLevel", 
  5.             ONE_STRING_PARAM);

代码示例来源：origin: log4j/log4j

  1. Class customLevel = Loader.loadClass(clazz);

代码示例来源：origin: log4j/log4j

  1. if(className != null) {
  2.  try {
  3. Class classObj = Loader.loadClass(className);
  4. if(!superClass.isAssignableFrom(classObj)) {
  5.  LogLog.error("A \""+className+"\" object is not assignable to a \""+

代码示例来源：origin: log4j/log4j

  1. LogLog.debug("Class name: [" + className+']');    
  2. try {
  3.  Object instance     = Loader.loadClass(className).newInstance();
  4.  Appender appender    = (Appender)instance;
  5.  PropertySetter propSetter = new PropertySetter(appender);

代码示例来源：origin: log4j/log4j

  1. LogLog.debug("Desired logger sub-class: ["+className+']');
  2.  try {	 
  3. Class clazz = Loader.loadClass(className);
  4. Method getInstanceMethod = clazz.getMethod("getLogger", 
  5.            ONE_STRING_PARAM);

代码示例来源：origin: log4j/log4j

  1. /**
  2.   Add a renderer to a hierarchy passed as parameter.
  3. */
  4. static
  5. public
  6. void addRenderer(RendererSupport repository, String renderedClassName,
  7.      String renderingClassName) {
  8.  LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
  9.     renderedClassName+"].");
  10.  ObjectRenderer renderer = (ObjectRenderer)
  11.       OptionConverter.instantiateByClassName(renderingClassName,
  12.              ObjectRenderer.class,
  13.              null);
  14.  if(renderer == null) {
  15.   LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
  16.   return;
  17.  } else {
  18.   try {
  19.  Class renderedClass = Loader.loadClass(renderedClassName);
  20.  repository.setRenderer(renderedClass, renderer);
  21.   } catch(ClassNotFoundException e) {
  22.  LogLog.error("Could not find class ["+renderedClassName+"].", e);
  23.   }
  24.  }
  25. }

代码示例来源：origin: camunda/camunda-bpm-platform

  1. private
  2. void readLevel(ObjectInputStream ois)
  3.           throws java.io.IOException, ClassNotFoundException {
  4.  int p = ois.readInt();
  5.  try {
  6.   String className = (String) ois.readObject();
  7.   if(className == null) {
  8.  level = Level.toLevel(p);
  9.   } else {
  10.  Method m = (Method) methodCache.get(className);
  11.  if(m == null) {
  12.   Class clazz = Loader.loadClass(className);
  13.   // Note that we use Class.getDeclaredMethod instead of
  14.   // Class.getMethod. This assumes that the Level subclass
  15.   // implements the toLevel(int) method which is a
  16.   // requirement. Actually, it does not make sense for Level
  17.   // subclasses NOT to implement this method. Also note that
  18.   // only Level can be subclassed and not Priority.
  19.   m = clazz.getDeclaredMethod(TO_LEVEL, TO_LEVEL_PARAMS);
  20.   methodCache.put(className, m);
  21.  }
  22.  PARAM_ARRAY[0] = new Integer(p);
  23.  level = (Level) m.invoke(null,  PARAM_ARRAY);
  24.   }
  25.  } catch(Exception e) {
  26.  LogLog.warn("Level deserialization failed, reverting to default.", e);
  27.  level = Level.toLevel(p);
  28.  }
  29. }

代码示例来源：origin: apache/log4j

  1. private
  2. void readLevel(ObjectInputStream ois)
  3.           throws java.io.IOException, ClassNotFoundException {
  4.  int p = ois.readInt();
  5.  try {
  6.   String className = (String) ois.readObject();
  7.   if(className == null) {
  8.  level = Level.toLevel(p);
  9.   } else {
  10.  Method m = (Method) methodCache.get(className);
  11.  if(m == null) {
  12.   Class clazz = Loader.loadClass(className);
  13.   // Note that we use Class.getDeclaredMethod instead of
  14.   // Class.getMethod. This assumes that the Level subclass
  15.   // implements the toLevel(int) method which is a
  16.   // requirement. Actually, it does not make sense for Level
  17.   // subclasses NOT to implement this method. Also note that
  18.   // only Level can be subclassed and not Priority.
  19.   m = clazz.getDeclaredMethod(TO_LEVEL, TO_LEVEL_PARAMS);
  20.   methodCache.put(className, m);
  21.  }
  22.  PARAM_ARRAY[0] = new Integer(p);
  23.  level = (Level) m.invoke(null,  PARAM_ARRAY);
  24.   }
  25.  } catch(Exception e) {
  26.  LogLog.warn("Level deserialization failed, reverting to default.", e);
  27.  level = Level.toLevel(p);
  28.  }
  29. }

代码示例来源：origin: camunda/camunda-bpm-platform

  1. if(className != null) {
  2.  try {
  3. Class classObj = Loader.loadClass(className);
  4. if(!superClass.isAssignableFrom(classObj)) {
  5.  LogLog.error("A \""+className+"\" object is not assignable to a \""+

代码示例来源：origin: camunda/camunda-bpm-platform

  1. LogLog.debug("Parsing layout of class: \""+className+"\"");		 
  2. try {
  3.  Object instance     = Loader.loadClass(className).newInstance();
  4.  Layout layout       = (Layout)instance;
  5.  PropertySetter propSetter = new PropertySetter(layout);

代码示例来源：origin: apache/log4j

  1. LogLog.debug("Parsing throwableRenderer of class: \""+className+"\"");
  2. try {
  3.  Object instance     = Loader.loadClass(className).newInstance();
  4.  ThrowableRenderer tr       = (ThrowableRenderer)instance;
  5.  PropertySetter propSetter = new PropertySetter(tr);

代码示例来源：origin: camunda/camunda-bpm-platform

  1. LogLog.debug("Desired Level sub-class: ["+className+']');
  2. try {	 
  3.  Class clazz = Loader.loadClass(className);
  4.  Method toLevelMethod = clazz.getMethod("toLevel", 
  5.             ONE_STRING_PARAM);

代码示例来源：origin: camunda/camunda-bpm-platform

  1. LogLog.debug("Desired logger sub-class: ["+className+']');
  2.  try {	 
  3. Class clazz = Loader.loadClass(className);
  4. Method getInstanceMethod = clazz.getMethod("getLogger", 
  5.            ONE_STRING_PARAM);

代码示例来源：origin: camunda/camunda-bpm-platform

  1. /**
  2.   Add a renderer to a hierarchy passed as parameter.
  3. */
  4. static
  5. public
  6. void addRenderer(RendererSupport repository, String renderedClassName,
  7.      String renderingClassName) {
  8.  LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
  9.     renderedClassName+"].");
  10.  ObjectRenderer renderer = (ObjectRenderer)
  11.       OptionConverter.instantiateByClassName(renderingClassName,
  12.              ObjectRenderer.class,
  13.              null);
  14.  if(renderer == null) {
  15.   LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
  16.   return;
  17.  } else {
  18.   try {
  19.  Class renderedClass = Loader.loadClass(renderedClassName);
  20.  repository.setRenderer(renderedClass, renderer);
  21.   } catch(ClassNotFoundException e) {
  22.  LogLog.error("Could not find class ["+renderedClassName+"].", e);
  23.   }
  24.  }
  25. }

代码示例来源：origin: apache/log4j

  1. /**
  2.   Add a renderer to a hierarchy passed as parameter.
  3. */
  4. static
  5. public
  6. void addRenderer(RendererSupport repository, String renderedClassName,
  7.      String renderingClassName) {
  8.  LogLog.debug("Rendering class: ["+renderingClassName+"], Rendered class: ["+
  9.     renderedClassName+"].");
  10.  ObjectRenderer renderer = (ObjectRenderer)
  11.       OptionConverter.instantiateByClassName(renderingClassName,
  12.              ObjectRenderer.class,
  13.              null);
  14.  if(renderer == null) {
  15.   LogLog.error("Could not instantiate renderer ["+renderingClassName+"].");
  16.   return;
  17.  } else {
  18.   try {
  19.  Class renderedClass = Loader.loadClass(renderedClassName);
  20.  repository.setRenderer(renderedClass, renderer);
  21.   } catch(ClassNotFoundException e) {
  22.  LogLog.error("Could not find class ["+renderedClassName+"].", e);
  23.   }
  24.  }
  25. }

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