浅析Java中ApacheBeanUtils和SpringBeanUtils的用法

publicclass PersonSource {
 private Integer id;
 private String username;
 private String password;
 private Integer age;
 // getters/setters omiited
}
publicclass PersonDest {
 private Integer id;
 private String username;
 private Integer age;
 // getters/setters omiited
}
publicclass TestApacheBeanUtils {
 public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
  //下面只是用于单独测试
  PersonSource persOnSource= new PersonSource(1, "pjmike", "12345", 21);
  PersonDest persOnDest= new PersonDest();
  BeanUtils.copyProperties(personDest,personSource);
  System.out.println("persondest: "+personDest);
 }
}
persondest: PersonDest{id=1, username='pjmike', age=21}

//将源对象中的值拷贝到目标对象//将源对象中的值拷贝到目标对象
public static void copyProperties(Object dest, Object orig) throws IllegalAccessException, InvocationTargetException {
 BeanUtilsBean.getInstance().copyProperties(dest, orig);
}

public void copyProperties(final Object dest, final Object orig)
  throws IllegalAccessException, InvocationTargetException {

  // Validate existence of the specified beans
  if (dest == null) {
   thrownew IllegalArgumentException
     ("No destination bean specified");
  }
  if (orig == null) {
   thrownew IllegalArgumentException("No origin bean specified");
  }
  if (log.isDebugEnabled()) {
   log.debug("BeanUtils.copyProperties(" + dest + ", " +
      orig + ")");
  }

  // Copy the properties, converting as necessary
  if (orig instanceof DynaBean) {
   final DynaProperty[] origDescriptors =
    ((DynaBean) orig).getDynaClass().getDynaProperties();
   for (DynaProperty origDescriptor : origDescriptors) {
    final String name = origDescriptor.getName();
    // Need to check isReadable() for WrapDynaBean
    // (see Jira issue# BEANUTILS-61)
    if (getPropertyUtils().isReadable(orig, name) &&
     getPropertyUtils().isWriteable(dest, name)) {
     final Object value = ((DynaBean) orig).get(name);
     copyProperty(dest, name, value);
    }
   }
  } elseif (orig instanceof Map) {
   @SuppressWarnings("unchecked")
   final
   // Map properties are always of type 
   Map propMap = (Map) orig;
   for (final Map.Entry entry : propMap.entrySet()) {
    final String name = entry.getKey();
    if (getPropertyUtils().isWriteable(dest, name)) {
     copyProperty(dest, name, entry.getValue());
    }
   }
  } else/* if (orig is a standard JavaBean) */ {
   final PropertyDescriptor[] origDescriptors =
    getPropertyUtils().getPropertyDescriptors(orig);
   for (PropertyDescriptor origDescriptor : origDescriptors) {
    final String name = origDescriptor.getName();
    if ("class".equals(name)) {
     continue; // No point in trying to set an object's class
    }
    if (getPropertyUtils().isReadable(orig, name) &&
     getPropertyUtils().isWriteable(dest, name)) {
     try {
      final Object value =
       getPropertyUtils().getSimpleProperty(orig, name);
      copyProperty(dest, name, value);
     } catch (final NoSuchMethodException e) {
      // Should not happen
     }
    }
   }
  }

 }

publicclass TestSpringBeanUtils {
 public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {

  //下面只是用于单独测试
  PersonSource persOnSource= new PersonSource(1, "pjmike", "12345", 21);
  PersonDest persOnDest= new PersonDest();
  BeanUtils.copyProperties(personSource,personDest);
  System.out.println("persondest: "+personDest);
 }
}

private static void copyProperties(Object source, Object target, @Nullable Class<&＃63;> editable,
  @Nullable String... ignoreProperties) throws BeansException {

 Assert.notNull(source, "Source must not be null");
 Assert.notNull(target, "Target must not be null");

 Class<&＃63;> actualEditable = target.getClass();
 if (editable != null) {
  if (!editable.isInstance(target)) {
  throw new IllegalArgumentException("Target class [" + target.getClass().getName() +
   "] not assignable to Editable class [" + editable.getName() + "]");
  }
  actualEditable = editable;
 }
 PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
 List ignoreList = (ignoreProperties != null &＃63; Arrays.asList(ignoreProperties) : null);

 for (PropertyDescriptor targetPd : targetPds) {
  Method writeMethod = targetPd.getWriteMethod();
  if (writeMethod != null && (ignoreList == null || !ignoreList.contains(targetPd.getName()))) {
  PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
  if (sourcePd != null) {
   Method readMethod = sourcePd.getReadMethod();
   if (readMethod != null &&
    ClassUtils.isAssignable(writeMethod.getParameterTypes()[0], readMethod.getReturnType())) {
   try {
    if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
    readMethod.setAccessible(true);
    }
    Object value = readMethod.invoke(source);
    if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
    writeMethod.setAccessible(true);
    }
    writeMethod.invoke(target, value);
   }
   catch (Throwable ex) {
    throw new FatalBeanException(
     "Could not copy property '" + targetPd.getName() + "' from source to target", ex);
   }
   }
  }
  }
 }
 }