平时使用ProtoStuff作为序列化工具,对于一些POJO对象序列化,但是在实际使用中,发现针对BigDecimal对象进行序列化时却出现了问题
- 不管什么数,生成的byte数组都一样
- 无法正确反序列化
下面记录一下这个问题
1. 场景复现
我们使用的protostuff依赖如下
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| <dependency> <groupId>com.dyuproject.protostuff</groupId> <artifactId>protostuff-core</artifactId> <version>1.1.3</version> </dependency> <dependency> <groupId>com.dyuproject.protostuff</groupId> <artifactId>protostuff-runtime</artifactId> <version>1.1.3</version> </dependency>
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写一个简单测试demo,如下
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| public static byte[] serialize(Object obj) { Schema schema = RuntimeSchema.getSchema(obj.getClass()); LinkedBuffer buffer = LinkedBuffer.allocate(1048576);
byte[] protoStuff; try { protoStuff = ProtostuffIOUtil.toByteArray(obj, schema, buffer); } catch (Exception var8) { throw new RuntimeException("Failed to serializer"); } finally { buffer.clear(); }
return protoStuff; }
public static <T> T deserialize(byte[] paramArrayOfByte, Class<T> targetClass) { if (paramArrayOfByte != null && paramArrayOfByte.length != 0) { Schema<T> schema = RuntimeSchema.getSchema(targetClass); T instance = schema.newMessage(); ProtostuffIOUtil.mergeFrom(paramArrayOfByte, instance, schema); return instance; } else { throw new RuntimeException("Failed to deserialize"); } }
@Test public void testSer() { byte[] ans = serialize(new BigDecimal(20)); byte[] ans2 = serialize(new BigDecimal(120));
System.out.println(new String(ans)); System.out.println(new String(ans2));
BigDecimal res = deserialize(ans, BigDecimal.class); System.out.println(res); }
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执行如下
2. 疑似原因与兼容方法
并没有找到具体的原因,在github上有一个issure: https://github.com/protostuff/protostuff/issues/245,其中回复为
Protostuff works on user-defined types (pojos), not on built-in jdk types.
上面的说法是ProtoStuff更多的是用于简单对象的序列化,而不是基础的jdk类型,因此推荐的是序列一个成员变量为BigDecimal的对象
接下来我们试一下,定义一个简单的对象,成员为BigDecimal的场景
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| @Data public static class InnerDecimal { private BigDecimal decimal;
public InnerDecimal() { }
public InnerDecimal(BigDecimal decimal) { this.decimal = decimal; } }
@Test public void testSer() { byte[] ans = serialize(new InnerDecimal(new BigDecimal(20.123))); byte[] ans2 = serialize(new InnerDecimal(new BigDecimal(120.1970824)));
System.out.println(new String(ans)); System.out.println(new String(ans2));
InnerDecimal res = deserialize(ans, InnerDecimal.class); System.out.println(res); }
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测试输出如下
上面虽然可以正常工作,但与我们希望的差别有点大,序列化一个BigDecimal,还需要定义一个POJO包装他,有点麻烦;于是一个猥琐的方法就是在序列化和反序列化的时候,针对BigDeimal进行特殊处理
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| public static byte[] serialize(Object obj) { if (obj instanceof BigDecimal) { obj = ((BigDecimal) obj).toPlainString(); }
Schema schema = RuntimeSchema.getSchema(obj.getClass()); LinkedBuffer buffer = LinkedBuffer.allocate(1048576);
byte[] protoStuff; try { protoStuff = ProtostuffIOUtil.toByteArray(obj, schema, buffer); } catch (Exception var8) { throw new RuntimeException("Failed to serializer"); } finally { buffer.clear(); }
return protoStuff; }
public static <T> T deserialize(byte[] paramArrayOfByte, Class<T> targetClass) { if (paramArrayOfByte != null && paramArrayOfByte.length != 0) { Schema schema; if (targetClass.isAssignableFrom(BigDecimal.class)) { schema = RuntimeSchema.getSchema(String.class); Object instance = schema.newMessage(); ProtostuffIOUtil.mergeFrom(paramArrayOfByte, instance, schema); return (T) new BigDecimal((String) instance); } else { schema = RuntimeSchema.getSchema(targetClass); Object instance = schema.newMessage(); ProtostuffIOUtil.mergeFrom(paramArrayOfByte, instance, schema); return (T) instance; } } else { throw new RuntimeException("Failed to deserialize"); } }
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再次测试,正常执行
II. 其他
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