cn.m1c.frame.utils.ObjectUtil Maven / Gradle / Ivy
package cn.m1c.frame.utils;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Array;
import java.util.Arrays;
/**
* 2016年7月27日 对象工具
* @author phil([email protected],m1c softCo.,ltd)
* @version lannie
*/
public abstract class ObjectUtil {
private static final int INITIAL_HASH = 7;
private static final int MULTIPLIER = 31;
private static final String EMPTY_STRING = "";
private static final String NULL_STRING = "null";
private static final String ARRAY_START = "{";
private static final String ARRAY_END = "}";
private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;
private static final String ARRAY_ELEMENT_SEPARATOR = ", ";
/**
* 检查对象是否为数组类型，包括基本类型数组和对象类型数组
* 参数 obj the object to check
*/
public static boolean isArray(Object obj) {
return (obj != null && obj.getClass().isArray());
}
/**
* 确定是否在给定的数组是空的：即null或长度为零。
* 参数 array the array to check
*/
public static boolean isEmpty(Object[] array) {
return (array == null || array.length == 0);
}
/**
* 检查是否在给定的数组包含给定的元素。
* 参数 array the array to check (may be null,
* in which case the return value will always be false)
* 参数 element the element to check for
* 返回 whether the element has been found in the given array
*/
public static boolean containsElement(Object[] array, Object element) {
if (array == null) {
return false;
}
for (Object arrayEle : array) {
if (nullSafeEquals(arrayEle, element)) {
return true;
}
}
return false;
}
/**
* Append the given Object to the given array, returning a new array
* consisting of the input array contents plus the given Object.
* 参数 array the array to append to (can be null)
* 参数 obj the Object to append
* 返回 the new array (of the same component type; never null)
*/
public static Object[] addObjectToArray(Object[] array, Object obj) {
Class compType = Object.class;
if (array != null) {
compType = array.getClass().getComponentType();
}
else if (obj != null) {
compType = obj.getClass();
}
int newArrLength = (array != null ? array.length + 1 : 1);
Object[] newArr = (Object[]) Array.newInstance(compType, newArrLength);
if (array != null) {
System.arraycopy(array, 0, newArr, 0, array.length);
}
newArr[newArr.length - 1] = obj;
return newArr;
}
/**
* Convert the given array (which may be a primitive array) to an
* object array (if necessary of primitive wrapper objects).
* A null source value will be converted to an
* empty Object array.
* 参数 source the (potentially primitive) array
* 返回 the corresponding object array (never null)
* 异常 IllegalArgumentException if the parameter is not an array
*/
public static Object[] toObjectArray(Object source) {
if (source instanceof Object[]) {
return (Object[]) source;
}
if (source == null) {
return new Object[0];
}
if (!source.getClass().isArray()) {
throw new IllegalArgumentException("Source is not an array: " + source);
}
int length = Array.getLength(source);
if (length == 0) {
return new Object[0];
}
Class wrapperType = Array.get(source, 0).getClass();
Object[] newArray = (Object[]) Array.newInstance(wrapperType, length);
for (int i = 0; i < length; i++) {
newArray[i] = Array.get(source, i);
}
return newArray;
}
//---------------------------------------------------------------------
// Convenience methods for content-based equality/hash-code handling
//---------------------------------------------------------------------
/**
* Determine if the given objects are equal, returning true
* if both are null or false if only one is
* null.
*
Compares arrays with Arrays.equals, performing an equality
* check based on the array elements rather than the array reference.
* 参数 o1 first Object to compare
* 参数 o2 second Object to compare
* 返回 whether the given objects are equal
* @see java.util.Arrays#equals
*/
public static boolean nullSafeEquals(Object o1, Object o2) {
if (o1 == o2) {
return true;
}
if (o1 == null || o2 == null) {
return false;
}
if (o1.equals(o2)) {
return true;
}
if (o1.getClass().isArray() && o2.getClass().isArray()) {
if (o1 instanceof Object[] && o2 instanceof Object[]) {
return Arrays.equals((Object[]) o1, (Object[]) o2);
}
if (o1 instanceof boolean[] && o2 instanceof boolean[]) {
return Arrays.equals((boolean[]) o1, (boolean[]) o2);
}
if (o1 instanceof byte[] && o2 instanceof byte[]) {
return Arrays.equals((byte[]) o1, (byte[]) o2);
}
if (o1 instanceof char[] && o2 instanceof char[]) {
return Arrays.equals((char[]) o1, (char[]) o2);
}
if (o1 instanceof double[] && o2 instanceof double[]) {
return Arrays.equals((double[]) o1, (double[]) o2);
}
if (o1 instanceof float[] && o2 instanceof float[]) {
return Arrays.equals((float[]) o1, (float[]) o2);
}
if (o1 instanceof int[] && o2 instanceof int[]) {
return Arrays.equals((int[]) o1, (int[]) o2);
}
if (o1 instanceof long[] && o2 instanceof long[]) {
return Arrays.equals((long[]) o1, (long[]) o2);
}
if (o1 instanceof short[] && o2 instanceof short[]) {
return Arrays.equals((short[]) o1, (short[]) o2);
}
}
return false;
}
/**
* 返回对象的Hash码
* Return as hash code for the given object; typically the value of
* {@link Object#hashCode()}. If the object is an array,
* this method will delegate to any of the nullSafeHashCode
* methods for arrays in this class. If the object is null,
* this method returns 0.
* @see #nullSafeHashCode(Object[])
* @see #nullSafeHashCode(boolean[])
* @see #nullSafeHashCode(byte[])
* @see #nullSafeHashCode(char[])
* @see #nullSafeHashCode(double[])
* @see #nullSafeHashCode(float[])
* @see #nullSafeHashCode(int[])
* @see #nullSafeHashCode(long[])
* @see #nullSafeHashCode(short[])
*/
public static int nullSafeHashCode(Object obj) {
if (obj == null) {
return 0;
}
if (obj.getClass().isArray()) {
if (obj instanceof Object[]) {
return nullSafeHashCode((Object[]) obj);
}
if (obj instanceof boolean[]) {
return nullSafeHashCode((boolean[]) obj);
}
if (obj instanceof byte[]) {
return nullSafeHashCode((byte[]) obj);
}
if (obj instanceof char[]) {
return nullSafeHashCode((char[]) obj);
}
if (obj instanceof double[]) {
return nullSafeHashCode((double[]) obj);
}
if (obj instanceof float[]) {
return nullSafeHashCode((float[]) obj);
}
if (obj instanceof int[]) {
return nullSafeHashCode((int[]) obj);
}
if (obj instanceof long[]) {
return nullSafeHashCode((long[]) obj);
}
if (obj instanceof short[]) {
return nullSafeHashCode((short[]) obj);
}
}
return obj.hashCode();
}
/**
* 返回数组内容的Hask码，当数组为空时返回0
* 参数 array
* 返回
*/
public static int nullSafeHashCode(Object[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + nullSafeHashCode(array[i]);
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(boolean[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + hashCode(array[i]);
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(byte[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + array[i];
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(char[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + array[i];
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(double[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + hashCode(array[i]);
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(float[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + hashCode(array[i]);
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(int[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + array[i];
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(long[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + hashCode(array[i]);
}
return hash;
}
/**
* Return a hash code based on the contents of the specified array.
* If array is null, this method returns 0.
*/
public static int nullSafeHashCode(short[] array) {
if (array == null) {
return 0;
}
int hash = INITIAL_HASH;
int arraySize = array.length;
for (int i = 0; i < arraySize; i++) {
hash = MULTIPLIER * hash + array[i];
}
return hash;
}
/**
* Return the same value as {@link Boolean#hashCode()}.
* @see Boolean#hashCode()
*/
public static int hashCode(boolean bool) {
return bool ? 1231 : 1237;
}
/**
* Return the same value as {@link Double#hashCode()}.
* @see Double#hashCode()
*/
public static int hashCode(double dbl) {
long bits = Double.doubleToLongBits(dbl);
return hashCode(bits);
}
/**
* Return the same value as {@link Float#hashCode()}.
* @see Float#hashCode()
*/
public static int hashCode(float flt) {
return Float.floatToIntBits(flt);
}
/**
* Return the same value as {@link Long#hashCode()}.
* @see Long#hashCode()
*/
public static int hashCode(long lng) {
return (int) (lng ^ (lng >>> 32));
}
//---------------------------------------------------------------------
// Convenience methods for toString output
//---------------------------------------------------------------------
/**
* Return a String representation of an object's overall identity.
* 参数 obj the object (may be null)
* 返回 the object's identity as String representation,
* or an empty String if the object was null
*/
public static String identityToString(Object obj) {
if (obj == null) {
return EMPTY_STRING;
}
return obj.getClass().getName() + "@" + getIdentityHexString(obj);
}
/**
* Return a hex String form of an object's identity hash code.
* 参数 obj the object
* 返回 the object's identity code in hex notation
*/
public static String getIdentityHexString(Object obj) {
return Integer.toHexString(System.identityHashCode(obj));
}
/**
* Return a content-based String representation if obj is
* not null; otherwise returns an empty String.
*
Differs from {@link #nullSafeToString(Object)} in that it returns
* an empty String rather than "null" for a null value.
* 参数 obj the object to build a display String for
* 返回 a display String representation of obj
* @see #nullSafeToString(Object)
*/
public static String getDisplayString(Object obj) {
if (obj == null) {
return EMPTY_STRING;
}
return nullSafeToString(obj);
}
/**
* Determine the class name for the given object.
*
Returns "null" if obj is null.
* 参数 obj the object to introspect (may be null)
* 返回 the corresponding class name
*/
public static String nullSafeClassName(Object obj) {
return (obj != null ? obj.getClass().getName() : NULL_STRING);
}
/**
* Return a String representation of the specified Object.
*
Builds a String representation of the contents in case of an array.
* Returns "null" if obj is null.
* 参数 obj the object to build a String representation for
* 返回 a String representation of obj
*/
public static String nullSafeToString(Object obj) {
if (obj == null) {
return NULL_STRING;
}
if (obj instanceof String) {
return (String) obj;
}
if (obj instanceof Object[]) {
return nullSafeToString((Object[]) obj);
}
if (obj instanceof boolean[]) {
return nullSafeToString((boolean[]) obj);
}
if (obj instanceof byte[]) {
return nullSafeToString((byte[]) obj);
}
if (obj instanceof char[]) {
return nullSafeToString((char[]) obj);
}
if (obj instanceof double[]) {
return nullSafeToString((double[]) obj);
}
if (obj instanceof float[]) {
return nullSafeToString((float[]) obj);
}
if (obj instanceof int[]) {
return nullSafeToString((int[]) obj);
}
if (obj instanceof long[]) {
return nullSafeToString((long[]) obj);
}
if (obj instanceof short[]) {
return nullSafeToString((short[]) obj);
}
String str = obj.toString();
return (str != null ? str : EMPTY_STRING);
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(Object[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(String.valueOf(array[i]));
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(boolean[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(byte[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(char[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append("'").append(array[i]).append("'");
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(double[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(float[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(int[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(long[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
/**
* Return a String representation of the contents of the specified array.
*
The String representation consists of a list of the array's elements,
* enclosed in curly braces ("{}"). Adjacent elements are separated
* by the characters ", " (a comma followed by a space). Returns
* "null" if array is null.
* 参数 array the array to build a String representation for
* 返回 a String representation of array
*/
public static String nullSafeToString(short[] array) {
if (array == null) {
return NULL_STRING;
}
int length = array.length;
if (length == 0) {
return EMPTY_ARRAY;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
if (i == 0) {
sb.append(ARRAY_START);
}
else {
sb.append(ARRAY_ELEMENT_SEPARATOR);
}
sb.append(array[i]);
}
sb.append(ARRAY_END);
return sb.toString();
}
public static boolean isTheClass(Object obj, Class cls){
if(obj.getClass().equals(cls) || cls.equals(Object.class)){
return true;
}
Class superClass = null;
while(!(superClass = obj.getClass().getSuperclass()).equals(Object.class)){
if(superClass.equals(cls)){
return true;
}
}
for(Class interfaceClass : obj.getClass().getInterfaces()){
if(interfaceClass.equals(cls)){
return true;
}
}
return false;
}
//-----------------------------------------------对象系列化----------------------------------------------------
public final static String CHARSET_ISO88591 = "ISO-8859-1";
/**
* 标题: serialize
* 描述: java对象序列化
* 参数 original 要进行序列化的java对象
* 返回 String 序列化的后的值
* 异常 IOException
*
*
*/
public static String serialize(Object original) throws IOException {
if(null==original) return null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(original);
byte[] str = baos.toByteArray();
oos.close();
baos.close();
return new String(str,CHARSET_ISO88591);
}
/**
* 标题: deserialize
* 描述: 序列化的String对象的反序列化
* 需要自己进行强制转换得到最终类型
* eg:
* Map newmap = (Map)SerializeUtil.deserialize(serializedMapStr);
* 参数 serializedstr 经序列化处理过的信息
* 返回 Object 反序列化后生成的Object。
* 异常 IOException
* 异常 UnsupportedEncodingException
* 异常 ClassNotFoundException
*
*/
public static Object deserialize(String serializedstr) throws UnsupportedEncodingException, IOException, ClassNotFoundException{
if(null==serializedstr)return null;
BufferedInputStream bis=new BufferedInputStream(new ByteArrayInputStream(serializedstr.getBytes(CHARSET_ISO88591)));
ObjectInputStream ois = new ObjectInputStream(bis);
Object obj = ois.readObject();
ois.close();
bis.close();
return obj;
}
public static byte[] objectToByteArray(Object original) throws IOException {
if (null == original)
return null;
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try (ObjectOutputStream oout = new ObjectOutputStream(bout);) {
oout.writeObject(original);
}
return bout.toByteArray();
}
public static void main(String[] args) {
System.out.println(nullSafeClassName(1l));
}
}