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What is the difference between JSON serialization and JDK serialization in storage?
What is the difference between JSON serialization and JDK serialization in storage?
Apr 19, 2025 pm 05:33 PM
JSON serialization and JDK serialization: storage space difference analysis
This article discusses the differences in data storage between two common methods: JSON serialization and JDK serialization. In storage systems such as Redis, choosing the right serialization method is crucial because it directly affects storage efficiency and space usage.
background:
During the process of learning Redis, the author found that JSON serialization is usually more efficient and takes up less space than JDK serialization. However, when studying OAuth2 in the Pig framework, it was found that its token token is serialized using JDK, which triggered in-depth thinking on the efficiency differences between the two serialization methods. In actual tests, after the same data is serialized using JSON, the storage space is much larger than that of JDK serialization (JDK version 17). After further testing different types of data, it was found that JSON serialization took up less space in some cases. This shows that the efficiency difference between JSON and JDK serialization is not absolute, but is closely related to the data type.
Test method:
To verify this conclusion, the following test was designed: JSON and JDK serialization were performed using RedisTemplate , and the storage space size was compared. The test code snippet is as follows:
// ... (Omit some code, including dependency injection and ObjectMapper initialization) ...
@Test
void testRedisSerialization() throws JsonProcessingException {
ComplexObject complexObject = createComplexObject(); // Create the test object redisTemplate.opsForValue().set("json:test", complexObject); // JSON serialization redisTemplate.setValueSerializer(RedisSerializer.java()); // JDK serialization redisTemplate.opsForValue().set("jdk:test", complexObject);
// ... (Compare storage space size) ...
}
// ... (Omit the ComplexObject class definition and createComplexObject method) ...
analyze:
JSON serialization is based on text and has high storage efficiency of character data, but non-character data such as numbers and booleans take up more space in JSON. The JSON format is well readable and portable, but its textual properties cause the spatial overhead to be greater than binary serialization.
JDK serialization is binary serialization, which contains metadata such as the data itself and type information. Therefore, in some cases, the spatial efficiency is not much higher than other binary serialization methods. But for binary data, JDK serialization saves more space. However, the data serialized by JDK can only be read by Java programs, which lacks readability and editability.
in conclusion:
The advantages and disadvantages of JSON and JDK serialization depend on the specific application scenario and data type. JSON is more suitable for character-type data, while JDK serialization is more efficient when processing binary data. When choosing a serialization method, you need to weigh factors such as space occupation, readability, portability and compatibility based on actual needs.
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