Java Code Examples for java.beans.PropertyDescriptor#getReadMethod()

private static boolean hasAtLeastOneBeanProperty(Class<?> clazz) {
    BeanInfo beanInfo = null;
    try {
        beanInfo = Introspector.getBeanInfo(clazz);
    } catch (IntrospectionException e) {
        return false;
    }

    for (PropertyDescriptor beanProp : beanInfo.getPropertyDescriptors()) {
        if (beanProp.getReadMethod() != null && beanProp.getWriteMethod() != null) {
            return true;
        }
    }

    return false;
}
 

private Element createElement( Document document, String name, Object bean )
    throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException {
  Element element = document.createElement( name );
  BeanInfo beanInfo = Introspector.getBeanInfo( bean.getClass(), Object.class );
  for( PropertyDescriptor propInfo: beanInfo.getPropertyDescriptors() ) {
    String propName = propInfo.getName();
    if( propInfo.getReadMethod() != null && String.class.isAssignableFrom( propInfo.getPropertyType() ) ) {
      String propValue = BeanUtils.getProperty( bean, propName );
      if( propValue != null && !propValue.isEmpty() ) {
        // Doing it the hard way to avoid having the &'s in the query string escaped at &
        Attr attr = document.createAttribute( propName );
        attr.setValue( propValue );
        element.setAttributeNode( attr );
        //element.setAttribute( propName, propValue );
      }
    }
  }
  return element;
}
 

private static boolean hasAtLeastOneBeanProperty(Class<?> clazz) {
    BeanInfo beanInfo = null;
    try {
        beanInfo = Introspector.getBeanInfo(clazz);
    } catch (IntrospectionException e) {
        return false;
    }

    for (PropertyDescriptor beanProp : beanInfo.getPropertyDescriptors()) {
        if (beanProp.getReadMethod() != null && beanProp.getWriteMethod() != null) {
            return true;
        }
    }

    return false;
}
 

private static Map<String, ?> extractMap(Object bean) throws IntrospectionException,
        InvocationTargetException,
        IllegalAccessException {
    LinkedHashMap<String, Object> result = new LinkedHashMap<>();

    BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
    PropertyDescriptor[] properties = beanInfo.getPropertyDescriptors();
    for (PropertyDescriptor property : properties) {
        Method readMethod = property.getReadMethod();
        if (!property.getName().equals("class") && readMethod != null) {
            result.put(property.getName(), readMethod.invoke(bean));
        }
    }

    return result;
}
 

/**
 * @see net.sf.jasperreports.engine.JRDataSourceProvider#getFields(net.sf.jasperreports.engine.JasperReport)
 */
@Override
public JRField[] getFields(JasperReport report) throws JRException {
	BeanInfo beanInfo = null;

	try {
		beanInfo = Introspector.getBeanInfo(beanClass);
	} catch (IntrospectionException e) {
		throw new JRException(e);
	}

	PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
	if(descriptors != null) 
	{
		ArrayList<JRField> fields = new ArrayList<JRField>(descriptors.length);
		
		for (int i = 0; i < descriptors.length; i++) {
			PropertyDescriptor descriptor = descriptors[i];
			
			if (!(descriptor instanceof IndexedPropertyDescriptor) && descriptor.getReadMethod() != null) 
			{
				JRDesignField field = new JRDesignField();
				field.setValueClassName(normalizeClass(descriptor.getPropertyType()).getCanonicalName());
				field.setName(descriptor.getName());
				
				fields.add(field);
			}
		}

		return fields.toArray(new JRField[fields.size()]);
	}

	return new JRField[0];
}
 

public static boolean hasPD(PropertyDescriptor pd) {
    if (null == pd.getPropertyType()) {
        return false;
    }
    return (null != pd.getReadMethod())
        || (null != pd.getWriteMethod());
}
 

public static Method getReadMethod(Class objClass, PropertyDescriptor pd) {
		Method readMethod;
//		if (Serializable.class.equals(pd.getPropertyType())) {
		if (pd.getReadMethod()==null || pd.getReadMethod().isBridge()) {
			readMethod = getReadMethod(objClass, pd.getName(), pd.getPropertyType());
		} else {
			readMethod = pd.getReadMethod();
		}
		return readMethod;
	}
 

private static void test(Class type) {
    PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(type, "prop");
    if (pd instanceof IndexedPropertyDescriptor) {
        error(pd, type.getSimpleName() + ".prop should not be an indexed property");
    }
    if (!pd.getPropertyType().equals(Color.class)) {
        error(pd, type.getSimpleName() + ".prop type should be a Color");
    }
    if (null == pd.getReadMethod()) {
        error(pd, type.getSimpleName() + ".prop should have classic read method");
    }
    if (null == pd.getWriteMethod()) {
        error(pd, type.getSimpleName() + ".prop should have classic write method");
    }
}
 

/**
 * 比较两个对象,并返回不一致的信息
 *
 * @author stylefeng
 * @Date 2017/5/9 19:34
 */
public static String contrastObj(Object pojo1, Object pojo2) {
    String str = "";
    try {
        Class clazz = pojo1.getClass();
        Field[] fields = pojo1.getClass().getDeclaredFields();
        int i = 1;
        for (Field field : fields) {
            if ("serialVersionUID".equals(field.getName())) {
                continue;
            }
            PropertyDescriptor pd = new PropertyDescriptor(field.getName(), clazz);
            Method getMethod = pd.getReadMethod();
            Object o1 = getMethod.invoke(pojo1);
            Object o2 = getMethod.invoke(pojo2);
            if (o1 == null || o2 == null) {
                continue;
            }
            if (o1 instanceof Date) {
                o1 = DateUtil.formatDate((Date) o1);
            }
            if (!o1.toString().equals(o2.toString())) {
                if (i != 1) {
                    str += separator;
                }
                str += "字段名称" + field.getName() + ",旧值:" + o1 + ",新值:" + o2;
                i++;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return str;
}
 

public static boolean hasPD(PropertyDescriptor pd) {
    if (null == pd.getPropertyType()) {
        return false;
    }
    return (null != pd.getReadMethod())
        || (null != pd.getWriteMethod());
}
 

private static void test(Class type) {
    PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(type, "prop");
    if (pd instanceof IndexedPropertyDescriptor) {
        error(pd, type.getSimpleName() + ".prop should not be an indexed property");
    }
    if (!pd.getPropertyType().equals(Color.class)) {
        error(pd, type.getSimpleName() + ".prop type should be a Color");
    }
    if (null == pd.getReadMethod()) {
        error(pd, type.getSimpleName() + ".prop should have classic read method");
    }
    if (null == pd.getWriteMethod()) {
        error(pd, type.getSimpleName() + ".prop should have classic write method");
    }
}
 

private static Object mergeDictText(Object object, Map<String, List<SysDictItem>> mapDictItems)
    throws Exception {
  // Map<Field->Value>
  HashMap<String, Object> mapFieldValues = new HashMap<>();
  //  Map<Field->FieldType>
  HashMap<String, Object> mapFieldAndType = new HashMap<>();

  Class<? extends Object> objectClass = object.getClass();
  BeanInfo beanInfo = Introspector.getBeanInfo(objectClass);
  PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
  // Get data that already exists in the object
  for (int i = 0; i < propertyDescriptors.length; i++) {
    PropertyDescriptor descriptor = propertyDescriptors[i];
    String propertyName = descriptor.getName();
    if (!propertyName.equals("class")) {
      Method readMethod = descriptor.getReadMethod();
      if (null == readMethod) {
        throw new Exception("Can not found " + propertyName + " ReadMethod(), All fields in "
            + objectClass.getName() + " need add set and set methods.");
      }
      Object result = readMethod.invoke(object, new Object[0]);
      mapFieldValues.put(propertyName, result);
      mapFieldAndType.put(propertyName, descriptor.getPropertyType());

      if (mapDictItems.containsKey(propertyName)) {
        // add new dict text field to object
        mapFieldAndType.put(propertyName + DICT_SUFFIX, String.class);

        List<SysDictItem> dictItems = mapDictItems.get(propertyName);
        for (SysDictItem dictItem : dictItems) {
          if (StringUtils.equals(String.valueOf(result), dictItem.getItemCode())) {
            mapFieldValues.put(propertyName + DICT_SUFFIX, dictItem.getItemName());
            break;
          }
        }
      }
    }
  }

  // Map to entity object
  DictAnnotation bean = new DictAnnotation(mapFieldAndType);
  Set<String> keys = mapFieldAndType.keySet();
  for (Iterator<String> it = keys.iterator(); it.hasNext(); ) {
    String key = it.next();
    bean.setValue(key, mapFieldValues.get(key));
  }

  Object newObj = bean.getObject();
  return newObj;
}
 

public BeanPropertyHandler(PropertyDescriptor pd) {
	super(pd.getPropertyType(), pd.getReadMethod() != null, pd.getWriteMethod() != null);
	this.pd = pd;
}
 

private static boolean isMappableProperty(PropertyDescriptor propertyDescriptor) {
    return propertyDescriptor.getReadMethod() != null
        && propertyDescriptor.getWriteMethod() != null
        && getPropertyAnnotation(propertyDescriptor, DynamoDbIgnore.class) == null;
}
 

/**
 * Tests the get/set methods of the specified class.
 */
public static <T> void validateAccssor(final Class<T> clazz, final String... skipThese)
        throws IntrospectionException {
    final PropertyDescriptor[] props = Introspector.getBeanInfo(clazz).getPropertyDescriptors();
    for (PropertyDescriptor prop : props) {

        for (String skipThis : skipThese) {
            if (skipThis.equals(prop.getName())) {
                continue;
            }
        }

        findBooleanIsMethods(clazz, prop);

        final Method getter = prop.getReadMethod();
        final Method setter = prop.getWriteMethod();

        if (getter != null && setter != null) {
            final Class<?> returnType = getter.getReturnType();
            final Class<?>[] params = setter.getParameterTypes();

            if (params.length == 1 && params[0] == returnType) {
                try {
                    Object value = buildValue(returnType);

                    T bean = clazz.getDeclaredConstructor().newInstance();

                    setter.invoke(bean, value);

                    Assert.assertEquals(
                            String.format(Locale.ROOT, "Failed while testing property %s", prop.getName()), value,
                            getter.invoke(bean));

                } catch (Exception ex) {
                    ex.printStackTrace();
                    System.err.println(
                            String.format(Locale.ROOT, "An exception was thrown while testing the property %s: %s",
                                    prop.getName(), ex.toString()));
                }
            }
        }
    }
}
 

/**
 * Iterate through all properties on the MBean class and gives subclasses
 * the chance to vote on the inclusion of both the accessor and mutator.
 * If a particular accessor or mutator is voted for inclusion, the appropriate
 * metadata is assembled and passed to the subclass for descriptor population.
 * @param managedBean the bean instance (might be an AOP proxy)
 * @param beanKey the key associated with the MBean in the beans map
 * of the {@code MBeanExporter}
 * @return the attribute metadata
 * @throws JMException in case of errors
 * @see #populateAttributeDescriptor
 */
@Override
protected ModelMBeanAttributeInfo[] getAttributeInfo(Object managedBean, String beanKey) throws JMException {
	PropertyDescriptor[] props = BeanUtils.getPropertyDescriptors(getClassToExpose(managedBean));
	List<ModelMBeanAttributeInfo> infos = new ArrayList<ModelMBeanAttributeInfo>();

	for (PropertyDescriptor prop : props) {
		Method getter = prop.getReadMethod();
		if (getter != null && getter.getDeclaringClass() == Object.class) {
			continue;
		}
		if (getter != null && !includeReadAttribute(getter, beanKey)) {
			getter = null;
		}

		Method setter = prop.getWriteMethod();
		if (setter != null && !includeWriteAttribute(setter, beanKey)) {
			setter = null;
		}

		if (getter != null || setter != null) {
			// If both getter and setter are null, then this does not need exposing.
			String attrName = JmxUtils.getAttributeName(prop, isUseStrictCasing());
			String description = getAttributeDescription(prop, beanKey);
			ModelMBeanAttributeInfo info = new ModelMBeanAttributeInfo(attrName, description, getter, setter);

			Descriptor desc = info.getDescriptor();
			if (getter != null) {
				desc.setField(FIELD_GET_METHOD, getter.getName());
			}
			if (setter != null) {
				desc.setField(FIELD_SET_METHOD, setter.getName());
			}

			populateAttributeDescriptor(desc, getter, setter, beanKey);
			info.setDescriptor(desc);
			infos.add(info);
		}
	}

	return infos.toArray(new ModelMBeanAttributeInfo[infos.size()]);
}
 

@Override
protected BeanInfo instantiate(Class<?> type, String prefix, String name) {
    if (DEFAULT.equals(prefix)) {
        prefix = DEFAULT_NEW;
    }
    // this optimization will only use the BeanInfo search path
    // if is has changed from the original
    // or trying to get the ComponentBeanInfo
    BeanInfo info = !DEFAULT_NEW.equals(prefix) || "ComponentBeanInfo".equals(name)
            ? super.instantiate(type, prefix, name)
            : null;

    if (info != null) {
        // make sure that the returned BeanInfo matches the class
        BeanDescriptor bd = info.getBeanDescriptor();
        if (bd != null) {
            if (type.equals(bd.getBeanClass())) {
                return info;
            }
        }
        else {
            PropertyDescriptor[] pds = info.getPropertyDescriptors();
            if (pds != null) {
                for (PropertyDescriptor pd : pds) {
                    Method method = pd.getReadMethod();
                    if (method == null) {
                        method = pd.getWriteMethod();
                    }
                    if (isValid(type, method)) {
                        return info;
                    }
                }
            }
            else {
                MethodDescriptor[] mds = info.getMethodDescriptors();
                if (mds != null) {
                    for (MethodDescriptor md : mds) {
                        if (isValid(type, md.getMethod())) {
                            return info;
                        }
                    }
                }
            }
        }
    }
    return null;
}
 

@SuppressWarnings({ "rawtypes", "unchecked" })
public static Map bean2Map(Object bean) throws IntrospectionException,
		IllegalAccessException, InvocationTargetException {
	Class type = bean.getClass();
	Map returnMap = new HashMap();
	BeanInfo beanInfo = Introspector.getBeanInfo(type);
	PropertyDescriptor[] propertyDescriptors = beanInfo
			.getPropertyDescriptors();
	for (int i = 0; i < propertyDescriptors.length; i++) {
		PropertyDescriptor descriptor = propertyDescriptors[i];
		String propertyName = descriptor.getName();
		if (!propertyName.equals("class")) {
			Method readMethod = descriptor.getReadMethod();
			Object result = readMethod.invoke(bean, new Object[0]);
			// System.out.println(descriptor.getName()+"---"+descriptor.getPropertyType().getSimpleName());
			if (result != null) {
				returnMap.put(propertyName, result);
			} else {
				switch (descriptor.getPropertyType().getSimpleName()) {
				case "String":
					returnMap.put(propertyName, "");
					break;
				case "Integer":
					returnMap.put(propertyName, 0);
					break;
				case "Long":
					returnMap.put(propertyName, 0l);
					break;
				case "BigDecimal":
					returnMap.put(propertyName, 0);
					break;
				case "int":
					returnMap.put(propertyName, 0);
					break;
				case "float":
					returnMap.put(propertyName, 0f);
					break;
				case "double":
					returnMap.put(propertyName, 0d);
					break;
				default:
					returnMap.put(propertyName, null);
				}

			}
		}
	}
	return returnMap;
}
 

/**
 * Copy the property values of the given source bean into the given target bean.
 * <p>Note: The source and target classes do not have to match or even be derived
 * from each other, as long as the properties match. Any bean properties that the
 * source bean exposes but the target bean does not will silently be ignored.
 * @param source the source bean
 * @param target the target bean
 * @param editable the class (or interface) to restrict property setting to
 * @param ignoreProperties array of property names to ignore
 * @throws BeansException if the copying failed
 * @see BeanWrapper
 */
private static void copyProperties(Object source, Object target, Class<?> editable, String... ignoreProperties)
		throws BeansException {

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

	Class<?> 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<String> ignoreList = (ignoreProperties != null ? 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);
					}
				}
			}
		}
	}
}
 

protected Map<String, Object> resolveBeanMetadata(final Object bean) {

        final Map<String, Object> beanMetadata = new LinkedHashMap<>();

        try {

            BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

            for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {

                Method readMethod = propertyDescriptor.getReadMethod();

                if (readMethod != null && isSimpleType(propertyDescriptor.getPropertyType())) {

                    String name = Introspector.decapitalize(propertyDescriptor.getName());
                    Object value = readMethod.invoke(bean);

                    beanMetadata.put(name, value);
                }

            }

        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return beanMetadata;

    }