Spring Boot参数校验：入门指南与最佳实践

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    @PostMapping("/users")
    public String createUser(@Validated @RequestBody UserDto userDto) {
        // 验证通过后的逻辑处理
        return "User created: " + userDto.getName();
    }
}

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

public class UserDto {

    @NotBlank(message = "Name cannot be blank")
    @Size(min = 2, max = 30)
    private String name;

    // 省略getter和setter方法
}