AI BriefingAnalyzing Jackson Deserializer Code
Key point
Introduces a method to automatically remove whitespace characters from QueryParam and JSON Body in a Spring Boot environment.
Details
The problem where a value exists in the database but is not displayed in the back office is often caused by whitespace characters or invisible special characters. To prevent this, it is important to ensure data accuracy by removing whitespace from the system input stage.
To remove whitespace from QueryParam, you can use a combination of @RestControllerAdvice and @InitBinder. Registering StringTrimmerEditor performs trim() processing on query parameters across all controllers, and the emptyAsNull option can convert empty strings to null, simplifying the validation process.
For JSON data passed via RequestBody, this is handled by customizing Jackson's Deserializer.
- Implement a custom class that extends JsonDeserializer
- Register the Deserializer with the ObjectMapper via SimpleModule
Applying this approach automatically strips whitespace from both sides of strings whenever JSON data is read, maintaining data consistency.
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