【序列化与反序列化】Java原生 & Hessian & protobuf

序列化应用场景：网络传输；将发送端信息序列化为二进制，通过流的方式发送到接收端后，反序列化还原对象

序列化方案：Java原生

待序列化对象必须implements Serializable

//序列化对象
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("./objectFile.obj"));
Customer customer = new Customer();    
out.writeObject("你好!");    //写入字面值常量
out.writeObject(new Date());    //写入匿名Date对象
out.writeObject(customer);    //写入customer对象
out.close();
        
//反序列化对象
ObjectInputStream in = new ObjectInputStream(new FileInputStream("./objectFile.obj"));
System.out.println("obj1 " + (String) in.readObject());    //读取字面值常量
System.out.println("obj2 " + (Date) in.readObject());    //读取匿名Date对象
Customer obj3 = (Customer) in.readObject();    //读取customer对象
System.out.println("obj3 " + obj3);
in.close();

序列化方案：Hessian

代码样例：

     // 序列化
     public static <T extends Serializable> byte[] serialize(T t){
        HessianOutput hessianOutput = null;
        try(ByteArrayOutputStream os = new ByteArrayOutputStream()){
            hessianOutput = new HessianOutput(os);
            hessianOutput.writeObject(t);
            return os.toByteArray();
        }catch(Exception e){
            LOGGER.error("serialize", e);
        }finally {
            if(hessianOutput!=null){
                try {
                    hessianOutput.close();
                } catch (IOException e) {
                    LOGGER.error("serialize", e);
                }
            }
        }
        return null;
    }

    //  反序列化
    public static <T extends Serializable> T deserialize(byte[] bytes){
        HessianInput hessianInput = null;
        try(ByteArrayInputStream is = new ByteArrayInputStream(bytes)){
            hessianInput = new HessianInput(is);
            return (T) hessianInput.readObject();
        }catch(Exception e){
            LOGGER.error("deserialize", e);
        }finally {
            if(hessianInput!=null){
                hessianInput.close();
            }
        }
        return null;
    }