将byte数组转为Object

小咪咪 2023-06-24 04:48 13阅读 0赞

如果使用下面方法，将会报`java.io.StreamCorruptedException: invalid stream header: 31323334`异常

public static Object toObject(byte[] bytes) { 
    	Object obj = null;
    	try { 
    		ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
    		ObjectInputStream ois = new ObjectInputStream(bis);
    		obj = ois.readObject();
    		ois.close();
    		bis.close();
    	} catch (IOException ex) { 
    		ex.printStackTrace();
    	} catch (ClassNotFoundException ex) { 
    		ex.printStackTrace();
    	}
    	return obj;
    }
    
    public static void main(String[] args) { 
    	String str = "123456";
    	byte b[] = str.getBytes();
    	Object obj = toObject(b);
    }

ObjectInputStream 是进行反序列化，因为反序列化byte数组之前没有对byte数组进行序列化，

> 如果使用readObject()读取，则必须使用writeObject()  
> 如果使用readUTF()读取，则必须使用writeUTF()  
> 如果使用readXXX()读取,对于大多数XXX值，都必须使用writeXXX()

##### 可使用下面的两种正确方法进行将byte数组转为Object #####

public static Object toObject(byte[] bytes) { 
    	Object obj = null;
    	try { 
    
    		FileOutputStream fos = new FileOutputStream("d:\\a.txt");
    		ObjectOutputStream oos = new ObjectOutputStream(fos);
    		oos.writeObject(bytes);
    
    		ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
    				"d:\\a.txt"));
    		return ois.readObject();
    	} catch (IOException ex) { 
    		ex.printStackTrace();
    	} catch (ClassNotFoundException e) { 
    		e.printStackTrace();
    	}
    	return obj;
    }

public static Object toObject2(byte[] bytes) { 
    	Object obj = new Object();
    	ByteArrayOutputStream baos = new ByteArrayOutputStream();
    	ObjectOutputStream oos;
    	try { 
    		oos = new ObjectOutputStream(baos);
    		oos.writeObject(bytes);
    		byte[] strData = baos.toByteArray();
    
    		ByteArrayInputStream bais = new ByteArrayInputStream(strData);
    		ObjectInputStream ois = new ObjectInputStream(bais);
    		obj = ois.readObject();
    	} catch (IOException e) { 
    		e.printStackTrace();
    	} catch (ClassNotFoundException e) { 
    		e.printStackTrace();
    	}
    
    	return obj;
    }