Request Body

@RequestBody

@PostMapping("/products")
public ResponseEntity<Product> create(
        @Valid @RequestBody CreateProductRequest request) {
    Product product = productService.create(request);
    return ResponseEntity.status(201).body(product);
}

// DTO
public class CreateProductRequest {
    @NotBlank
    private String name;

    @NotNull @Positive
    private BigDecimal price;

    private String description;

    // Getters and setters
}

JSON Mapping

POST /api/products
Content-Type: application/json

{
  "name": "Wireless Mouse",
  "price": 29.99,
  "description": "Ergonomic wireless mouse"
}

Content Types

Content-Type	Annotation	Use Case
application/json	@RequestBody	REST APIs
application/xml	@RequestBody	XML APIs
multipart/form-data	@RequestParam	File uploads
application/x-www-form-urlencoded	@ModelAttribute	HTML forms

Key Principles

1. Follow SOLID principles
2. Write clean, readable code
3. Test thoroughly
4. Document decisions
5. Monitor in production

Implementation

• Start simple, refactor as needed
• Use established patterns
• Consider trade-offs
• Review with peers

Continuous Improvement

• Learn from incidents
• Update documentation
• Share knowledge
• Mentor others

Key Points

• Understanding Request Body is essential for production systems
• Always consider scalability and maintainability
• Test thoroughly before deploying to production
• Monitor performance and set up alerting

Common Patterns

1. Validation: Always validate input at the boundary
2. Error Handling: Use structured error responses
3. Logging: Log key events for debugging
4. Testing: Unit, integration, and load tests
5. Documentation: Keep docs updated with code changes