@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
@JSONField(format = "yyyy-MM-dd HH:mm:ss")
@ApiModelProperty(value = "Before production date")
private Date productDatePre; @JsonFormatand@JSONFieldThe difference
@JsonFormat and @JSONField are both annotations for handling date formatting, but they belong to different libraries and frameworks respectively. The following is a detailed comparison of these two annotations, including their origins, main functions and applicable scenarios.
1. Source
@JsonFormat：
This is an annotation from the Jackson library. Jackson is a widely used Java JSON processing library for serializing Java objects into
JSON and deserialize JSON into Java objects. @JSONField:This is an annotation from the Fastjson library. Fastjson is a high-performance JSON processing library open source for Alibaba, designed to provide fast JSON
Serialization and deserialization functions.
2. Function
@JsonFormat：
Used to specify the format of the date type field during serialization and deserialization. Applicable to all contexts of Jackson, including API design, object mapping, and more. Available
The shape property specifies the output format, such as shape = . java
@JsonFormat(pattern = “yyyy-MM-dd HH:mm:ss”) private Date
productDatePre; @JSONField：It is mainly used for serialization and deserialization of Fastjson, and can specify the name, format, etc. of the field in JSON.
In addition to date format, it also supports many other functions, such as alias of fields, whether to serialize, etc. java @JSONField(format = "yyyy-MM-dd
HH:mm:ss”) private Date productDatePre;
3. Use scenarios
@JsonFormat: When you use Jackson for JSON processing, using @JsonFormat is a more suitable choice. For example,
In Spring Boot applications, Jackson is usually used as the default JSON processor. @JSONField:
If you use Fastjson in your project to handle JSON data, then using @JSONField is a better choice. Fastjson
Provides better performance, especially when dealing with large amounts of data.
4. Example
use @JsonFormat
java
import ;
import ;
public class Product {
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date productDatePre;
// getters and setters
}
use @JSONField
java
import ;
import ;
public class Product {
@JSONField(format = "yyyy-MM-dd HH:mm:ss")
private Date productDatePre;
// getters and setters
}
5. Summary
Selection: The choice of which annotation to use mainly depends on the JSON library you are using. If Jackson is used, use @JsonFormat; if
Fastjson, then use @JSONField. Interoperability: These two annotations cannot be directly interchangeable because they belong to different JSONs respectively
Processing framework. Make sure to use the same library consistently in your project to avoid potential problems.
When comparing @JsonFormat (from Jackson) and @JSONField (from Fastjson), the performance differences are mainly reflected in the following aspects:
1. Performance
Fastjson: Fastjson is generally considered faster in terms of performance, especially when dealing with large data volumes or complex data structures.
It uses many optimization techniques, such as precompilation, caching, etc., to improve the speed of serialization and deserialization. Jackson: Jackson is also a high-performance JSON
Processing libraries, but in some cases, especially when dealing with large numbers of small objects, may be slightly slower. Jackson
The flexibility and feature richness may lead to performance overhead in certain usage scenarios.
2. Memory usage
Fastjson: Fastjson usually performs better in terms of memory footprint because it uses fewer intermediate objects when serializing and deserializing. Jackson:
Jackson may generate more temporary objects in some cases, especially in complex nested structures, which may lead to higher memory usage.
3. Applicable scenarios
If your project involves simple JSON data exchange and has extremely high performance requirements, Fastjson may be a better choice.
If your project requires complex features such as data binding, annotation configuration, etc., Jackson provides richer features, although it may be slightly inferior in performance.
4. Other considerations
Ease of use: Jackson has some advantages in functionality and ease of use, especially when integrating with Spring frameworks. Community Support: Jackson
With wider community support and more documentation resources, it may be easier to find solutions when you encounter problems.
5. Summary
Overall, Fastjson usually performs better when it comes to pure performance, but Jackson has a greater advantage in functionality and flexibility.
The best choice depends on the specific usage scenario and requirements: if you focus on performance and process a large amount of data, Fastjson
Probably more appropriate; Jackson is a great choice if complex features and good community support are needed.
When it comes to scalability, Jackson is often considered to have better flexibility and scalability
1. Custom serialization and deserialization
Jackson: Jackson supports flexible extensions through custom serializers and deserializers. You can implement JsonSerializer and
The JsonDeserializer interface defines how to serialize and deserialize specific types.
It provides rich annotation support, which can easily be serialized through annotation configuration properties, such as @JsonIgnore, @JsonProperty, etc.
java
public class CustomSerializer extends JsonSerializer<MyClass> {
@Override
public void serialize(MyClass value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
// Custom serialization logic }
}
Fastjson: Fastjson also supports custom serialization and deserialization, but its expansion ability is relatively weak. You can use JSONType
Annotations specify serialization behavior, but their flexibility and functionality are relatively limited.
2. Support complex data structures
Jackson: Jackson can easily handle complex data structures, such as nested objects, collections, generics, etc., and can be flexibly configured when parsing and generating JSON. By using
ObjectMapper can conveniently handle complex JSON objects and support JSON Schema verification. Fastjson:
Fastjson is also able to handle complex data structures, but in some cases, additional configuration and processing may be required and less scalable.
3. Community and ecosystem
Jackson: Jackson has an active community and rich documentation support, with many third-party libraries and extensions that can be used with Jackson, such as Spring
Boot, Jersey, etc., enhance their ecosystem. Supports extensions to various data formats (such as XML, YAML, etc.) make Jackson more general.
Fastjson: Fastjson has a small ecosystem, mainly focusing on JSON processing, lacking rich third-party integration and support
4. Use scenarios
Jackson: If your project requires a high level of customizability, complex data structures, or integration with Spring frameworks, Jackson is a better choice.
Fastjson: If you need fast and simple JSON processing and don't involve complex serialization requirements, Fastjson may meet the basic needs.
5. Summary
Scalability: Overall, Jackson has more advantages in scalability, supporting rich custom serialization, annotation configurations, and integration with other frameworks. Simplicity vs
Flexibility: Fastjson performs well in simple scenarios, but Jackson is more suitable when complex scenarios or when extensions are required
In the Java ecosystem, Jackson and Fastjson are widely used JSON processing libraries, but their usage is different
1. Jackson usage
Widely used: Jackson is one of the most popular JSON processing libraries in the Java community, especially in projects using Spring frameworks. Spring
Boot uses Jackson to perform JSON serialization and deserialization by default.
Community Support: Jackson is used by many large enterprises and open source projects because of its active community support and rich documentation. Feature-rich: Jackson
Provides rich functionality and flexibility for handling complex JSON data structures.
2. Fastjson usage
High Performance: Fastjson is an open source JSON processing library from Alibaba, known for its high performance. Fastjson in scenarios where it is necessary to quickly parse and generate JSON
Favored. Enterprise usage: Fastjson is widely used in some projects of Alibaba and its subsidiaries, especially in high concurrency and high performance occasions. Simple and easy to use: for simple
JSON serialization and deserialization, Fastjson is also very simple to use, suitable for small projects or personal development.
3. Comparison and selection
If your project already uses Spring: Jackson is usually recommended because it integrates very well with Spring, is powerful and flexible.
If your project requires high-performance JSON processing: Fastjson may be a suitable choice in situations where performance is strictly required, especially in Alibaba-related projects.
Community and Support: Jackson has a larger community and support, so it may be easier to find solutions when you encounter problems.
4. Summary
Usage: Overall, Jackson is used more in the community and ecosystem, especially in Spring-related projects. Specific scenario: Fastjson
It is also significantly used in enterprise-level applications with high performance needs, especially Alibaba's related projects.
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