本文整理了Java中org.springframework.core.convert.TypeDescriptor.forObject()方法的一些代码示例，展示了TypeDescriptor.forObject()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。TypeDescriptor.forObject()方法的具体详情如下：
包路径：org.springframework.core.convert.TypeDescriptor
类名称：TypeDescriptor
方法名：forObject

TypeDescriptor.forObject介绍

[英]Create a new type descriptor for an object.

Use this factory method to introspect a source object before asking the conversion system to convert it to some another type.

If the provided object is null, returns null, else calls #valueOf(Class) to build a TypeDescriptor from the object's class.
[中]为对象创建新的类型描述符。
在要求转换系统将源对象转换为其他类型之前，请使用此工厂方法对其进行内省。
如果提供的对象为null，则返回null，否则调用#valueOf（Class）从对象的类中构建TypeDescriptor。

代码示例

代码示例来源：origin: spring-projects/spring-framework

private List<TypeDescriptor> getArgumentTypes(Object... arguments) {
  List<TypeDescriptor> descriptors = new ArrayList<>(arguments.length);
  for (Object argument : arguments) {
    descriptors.add(TypeDescriptor.forObject(argument));
  }
  return Collections.unmodifiableList(descriptors);
}

代码示例来源：origin: spring-projects/spring-framework

@Override
@SuppressWarnings("unchecked")
@Nullable
public <T> T convert(@Nullable Object source, Class<T> targetType) {
  Assert.notNull(targetType, "Target type to convert to cannot be null");
  return (T) convert(source, TypeDescriptor.forObject(source), TypeDescriptor.valueOf(targetType));
}

代码示例来源：origin: spring-projects/spring-framework

@SuppressWarnings("unchecked")
private <T> T convertValue(TypeConverter converter, @Nullable Object value, Class<T> targetType) {
  T result = (T) converter.convertValue(
      value, TypeDescriptor.forObject(value), TypeDescriptor.valueOf(targetType));
  if (result == null) {
    throw new IllegalStateException("Null conversion result for index [" + value + "]");
  }
  return result;
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public void setValue(@Nullable Object newValue) {
  if (this.mapEntryDescriptor.getMapValueTypeDescriptor() != null) {
    newValue = this.typeConverter.convertValue(newValue, TypeDescriptor.forObject(newValue),
        this.mapEntryDescriptor.getMapValueTypeDescriptor());
  }
  this.map.put(this.key, newValue);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void serializable() throws Exception {
  TypeDescriptor typeDescriptor = TypeDescriptor.forObject("");
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  ObjectOutputStream outputStream = new ObjectOutputStream(out);
  outputStream.writeObject(typeDescriptor);
  ObjectInputStream inputStream = new ObjectInputStream(new ByteArrayInputStream(
      out.toByteArray()));
  TypeDescriptor readObject = (TypeDescriptor) inputStream.readObject();
  assertThat(readObject, equalTo(typeDescriptor));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void formatMethodWithMultipleArgumentsForMessage() {
  String message = FormatHelper.formatMethodForMessage("foo", Arrays.asList(TypeDescriptor.forObject("a string"), TypeDescriptor.forObject(Integer.valueOf(5))));
  assertEquals("foo(java.lang.String,java.lang.Integer)", message);
}

代码示例来源：origin: spring-projects/spring-framework

private void populateReferenceTypeArray(ExpressionState state, Object newArray, TypeConverter typeConverter,
    InlineList initializer, Class<?> componentType) {
  TypeDescriptor toTypeDescriptor = TypeDescriptor.valueOf(componentType);
  Object[] newObjectArray = (Object[]) newArray;
  for (int i = 0; i < newObjectArray.length; i++) {
    SpelNode elementNode = initializer.getChild(i);
    Object arrayEntry = elementNode.getValue(state);
    newObjectArray[i] = typeConverter.convertValue(arrayEntry,
        TypeDescriptor.forObject(arrayEntry), toTypeDescriptor);
  }
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void mixedInNulls() throws Exception {
  List<Resource> resources = new ArrayList<>();
  resources.add(new ClassPathResource("test"));
  resources.add(null);
  resources.add(new FileSystemResource("test"));
  resources.add(new TestResource());
  TypeDescriptor sourceType = TypeDescriptor.forObject(resources);
  assertSame(resources, conversionService.convert(resources, sourceType, new TypeDescriptor(getClass().getField("resources"))));
}

代码示例来源：origin: spring-projects/spring-framework

@Test(expected = ConversionFailedException.class)
public void nothingInCommon() throws Exception {
  List<Object> resources = new ArrayList<>();
  resources.add(new ClassPathResource("test"));
  resources.add(3);
  TypeDescriptor sourceType = TypeDescriptor.forObject(resources);
  assertEquals(resources, conversionService.convert(resources, sourceType, new TypeDescriptor(getClass().getField("resources"))));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void convertMapToMap() throws Exception {
  Map<String, String> foo = new HashMap<>();
  foo.put("1", "BAR");
  foo.put("2", "BAZ");
  @SuppressWarnings("unchecked")
  Map<Integer, FooEnum> map = (Map<Integer, FooEnum>) conversionService.convert(foo,
      TypeDescriptor.forObject(foo), new TypeDescriptor(getClass().getField("genericMap")));
  assertEquals(FooEnum.BAR, map.get(1));
  assertEquals(FooEnum.BAZ, map.get(2));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void testWildcardMap() throws Exception {
  Map<String, String> input = new LinkedHashMap<>();
  input.put("key", "value");
  Object converted = conversionService.convert(input, TypeDescriptor.forObject(input), new TypeDescriptor(getClass().getField("wildcardMap")));
  assertEquals(input, converted);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void listToCollectionNoCopyRequired() throws NoSuchFieldException {
  List<?> input = new ArrayList<>(Arrays.asList("foo", "bar"));
  assertSame(input, conversionService.convert(input, TypeDescriptor.forObject(input),
      new TypeDescriptor(getClass().getField("wildcardCollection"))));
}

代码示例来源：origin: spring-projects/spring-framework

@SuppressWarnings("rawtypes")
private void testCollectionConversionToArrayList(Collection<String> aSource) {
  Object myConverted = (new CollectionToCollectionConverter(new GenericConversionService())).convert(
      aSource, TypeDescriptor.forObject(aSource), TypeDescriptor.forObject(new ArrayList()));
  assertTrue(myConverted instanceof ArrayList<?>);
  assertEquals(aSource.size(), ((ArrayList<?>) myConverted).size());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void testStringToEnumSet() throws Exception {
  conversionService.addConverterFactory(new StringToEnumConverterFactory());
  List<String> list = new ArrayList<>();
  list.add("A");
  list.add("C");
  assertEquals(EnumSet.of(MyEnum.A, MyEnum.C),
      conversionService.convert(list, TypeDescriptor.forObject(list), new TypeDescriptor(getClass().getField("enumSet"))));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void testStandardTypeConverter() throws EvaluationException {
  TypeConverter tc = new StandardTypeConverter();
  tc.convertValue(3, TypeDescriptor.forObject(3), TypeDescriptor.valueOf(Double.class));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void emptyMapDifferentTargetImplType() throws Exception {
  Map<String, String> map = new HashMap<>();
  TypeDescriptor sourceType = TypeDescriptor.forObject(map);
  TypeDescriptor targetType = new TypeDescriptor(getClass().getField("emptyMapDifferentTarget"));
  assertTrue(conversionService.canConvert(sourceType, targetType));
  @SuppressWarnings("unchecked")
  LinkedHashMap<String, String> result = (LinkedHashMap<String, String>) conversionService.convert(map, sourceType, targetType);
  assertEquals(map, result);
  assertEquals(LinkedHashMap.class, result.getClass());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void emptyListToList() throws Exception {
  conversionService.addConverter(new CollectionToCollectionConverter(conversionService));
  conversionService.addConverterFactory(new StringToNumberConverterFactory());
  List<String> list = new ArrayList<>();
  TypeDescriptor sourceType = TypeDescriptor.forObject(list);
  TypeDescriptor targetType = new TypeDescriptor(getClass().getField("emptyListTarget"));
  assertTrue(conversionService.canConvert(sourceType, targetType));
  assertEquals(list, conversionService.convert(list, sourceType, targetType));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void emptyListToArray() {
  conversionService.addConverter(new CollectionToArrayConverter(conversionService));
  conversionService.addConverterFactory(new StringToNumberConverterFactory());
  List<String> list = new ArrayList<>();
  TypeDescriptor sourceType = TypeDescriptor.forObject(list);
  TypeDescriptor targetType = TypeDescriptor.valueOf(String[].class);
  assertTrue(conversionService.canConvert(sourceType, targetType));
  assertEquals(0, ((String[]) conversionService.convert(list, sourceType, targetType)).length);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void elementTypeForMapSubclass() throws Exception {
  @SuppressWarnings("serial")
  class CustomMap extends HashMap<String, Integer> {
  }
  assertEquals(TypeDescriptor.valueOf(CustomMap.class).getMapKeyTypeDescriptor(), TypeDescriptor.valueOf(String.class));
  assertEquals(TypeDescriptor.valueOf(CustomMap.class).getMapValueTypeDescriptor(), TypeDescriptor.valueOf(Integer.class));
  assertEquals(TypeDescriptor.forObject(new CustomMap()).getMapKeyTypeDescriptor(), TypeDescriptor.valueOf(String.class));
  assertEquals(TypeDescriptor.forObject(new CustomMap()).getMapValueTypeDescriptor(), TypeDescriptor.valueOf(Integer.class));
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void elementTypeForCollectionSubclass() throws Exception {
  @SuppressWarnings("serial")
  class CustomSet extends HashSet<String> {
  }
  assertEquals(TypeDescriptor.valueOf(CustomSet.class).getElementTypeDescriptor(), TypeDescriptor.valueOf(String.class));
  assertEquals(TypeDescriptor.forObject(new CustomSet()).getElementTypeDescriptor(), TypeDescriptor.valueOf(String.class));
}