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前言

前后端统一用MessagePack，结果序列化的结果不一样，发现C#侧需要给每个类增加描述字段数量的Head，而Java却不用，所以在Java侧封装一下序列化和反序列化方法，这样两边解析的内容就完全一致了。

项目

代码编写

感觉还有很大的压缩空间

import org.msgpack.core.MessageBufferPacker;
import org.msgpack.core.MessagePack;
import org.msgpack.core.MessageUnpacker;import java.io.IOException;
import java.lang.reflect.*;
import java.util.*;public class MessagePackSerializer {public static byte[] serialize(Object obj) throws IOException, IllegalAccessException {try (MessageBufferPacker packer = MessagePack.newDefaultBufferPacker()) {serializeObject(obj, packer);return packer.toByteArray();}}public static <T> T deserialize(byte[] data, Class<T> clazz) throws IOException, IllegalAccessException,InstantiationException, InvocationTargetException, NoSuchMethodException, ClassNotFoundException {try (MessageUnpacker unpacker = MessagePack.newDefaultUnpacker(data)) {return clazz.cast(deserializeObject(clazz, unpacker));}}private static void serializeObject(Object obj, MessageBufferPacker packer)throws IOException, IllegalAccessException {if (obj == null) {packer.packNil();return;}Class<?> clazz = obj.getClass();List<Field> allFields = new ArrayList<>();while (clazz != null) {Field[] fields = clazz.getDeclaredFields();allFields.addAll(Arrays.asList(fields));clazz = clazz.getSuperclass(); // 处理父类字段}packer.packArrayHeader(allFields.size());for (Field field : allFields) {field.setAccessible(true);Object value = field.get(obj);serializeValue(value, packer);}}private static Object deserializeObject(Class<?> clazz, MessageUnpacker unpacker) throws IOException,IllegalAccessException, InvocationTargetException, InstantiationException, NoSuchMethodException,ClassNotFoundException {if (unpacker.tryUnpackNil()) {return null;}Object obj = clazz.getDeclaredConstructor().newInstance();int fieldCount = unpacker.unpackArrayHeader();List<Field> allFields = new ArrayList<>();while (clazz != null) {Field[] fields = clazz.getDeclaredFields();allFields.addAll(Arrays.asList(fields));clazz = clazz.getSuperclass();}for (int i = 0; i < fieldCount; i++) {Field field = allFields.get(i);field.setAccessible(true);Object value = deserializeValue(field.getType(), unpacker, getFieldGenericType(field));field.set(obj, value);}return obj;}private static void serializeValue(Object value, MessageBufferPacker packer)throws IOException, IllegalAccessException {if (value == null) {packer.packNil();} else if (value instanceof String) {packer.packString((String) value);} else if (value instanceof Integer) {packer.packInt((Integer) value);} else if (value instanceof Long) {packer.packLong((Long) value);} else if (value instanceof Float) {packer.packFloat((Float) value);} else if (value instanceof Double) {packer.packDouble((Double) value);} else if (value instanceof Boolean) {packer.packBoolean((Boolean) value);} else if (value instanceof List) {List<?> list = (List<?>) value;packer.packArrayHeader(list.size());for (Object item : list) {serializeValue(item, packer);}} else if (value instanceof Map) {Map<?, ?> map = (Map<?, ?>) value;packer.packMapHeader(map.size());for (Map.Entry<?, ?> entry : map.entrySet()) {serializeValue(entry.getKey(), packer);serializeValue(entry.getValue(), packer);}} else {serializeObject(value, packer);}}private static Object deserializeValue(Class<?> type, MessageUnpacker unpacker, Type genericType)throws IOException, IllegalAccessException, InstantiationException, InvocationTargetException,NoSuchMethodException, ClassNotFoundException {if (unpacker.tryUnpackNil()) {return null;} else if (type == String.class) {return unpacker.unpackString();} else if (type == Integer.class || type == int.class) {return unpacker.unpackInt();} else if (type == Long.class || type == long.class) {return unpacker.unpackLong();} else if (type == Float.class || type == float.class) {return unpacker.unpackFloat();} else if (type == Double.class || type == double.class) {return unpacker.unpackDouble();} else if (type == Boolean.class || type == boolean.class) {return unpacker.unpackBoolean();} else if (List.class.isAssignableFrom(type)) {int size = unpacker.unpackArrayHeader();List<Object> list = new ArrayList<Object>(size);for (int i = 0; i < size; i++) {Type listItemType = (genericType instanceof ParameterizedType)? ((ParameterizedType) genericType).getActualTypeArguments()[0]: Object.class;list.add(deserializeValue((Class<?>) listItemType, unpacker, listItemType));}return list;} else if (Map.class.isAssignableFrom(type)) {int size = unpacker.unpackMapHeader();Map<Object, Object> map = new HashMap<Object, Object>(size);Type keyType = (genericType instanceof ParameterizedType)? ((ParameterizedType) genericType).getActualTypeArguments()[0]: String.class;Type valueType = (genericType instanceof ParameterizedType)? ((ParameterizedType) genericType).getActualTypeArguments()[1]: Object.class;for (int i = 0; i < size; i++) {Object key = deserializeValue((Class<?>) keyType, unpacker, keyType);Object value = deserializeValue((Class<?>) valueType, unpacker, valueType);map.put(key, value);}return map;} else {return deserializeObject(type, unpacker);}}private static Type getFieldGenericType(Field field) {return field.getGenericType();}
}

结

如果有优化会放到下面这个地址
JavaMsgPack-Utility