protostuff序列化

github地址：

https://github.com/protostuff/protostuff

Documentation:

http://www.protostuff.io/

Usage (maven)

 
    io.protostuff 
    protostuff-core 
    1.3.5 

protostuff工具类

编写一个SerializationUtil工具类，使用Protostuff实现序列化：

public class SerializationUtil {

    private static Map, Schema> cachedSchema = new ConcurrentHashMap<>();

    private static Objenesis objenesis = new ObjenesisStd(true);

    private SerializationUtil() {
    }

    @SuppressWarnings("unchecked")
    private static  Schema getSchema(Class cls) {
        Schema schema = (Schema) cachedSchema.get(cls);
        if (schema == null) {
            schema = RuntimeSchema.createFrom(cls);
            if (schema != null) {
                cachedSchema.put(cls, schema);
            }
        }
        return schema;
    }

    @SuppressWarnings("unchecked")
    public static  byte[] serialize(T obj) {
        Class cls = (Class) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try {
            Schema schema = getSchema(cls);
            return ProtostuffIOUtil.toByteArray(obj, schema, buffer);
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        } finally {
            buffer.clear();
        }
    }

    public static  T deserialize(byte[] data, Class cls) {
        try {
            T message = (T) objenesis.newInstance(cls);
            Schema schema = getSchema(cls);
            ProtostuffIOUtil.mergeFrom(data, message, schema);
            return message;
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
}

以上了使用 Objenesis 来实例化对象，它是比 Java 反射更加强大。

注意：如需要替换其它序列化框架，只需修改SerializationUtil即可。当然，更好的实现方式是提供配置项来决定使用哪种序列化方式。