Spring Boot请求正文验证输入无效数据类型时添加自定义消息

{
  "username": "testuser",
  "age": "twenty"
}

import javax.validation.constraints.Pattern;

public class UserRegistration {

    private String username;

    @Pattern(regexp = "\\d+", message = "年龄必须是整数")
    private String age;

    // getters and setters
}

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("/register")
    public String registerUser(@Validated @RequestBody UserRegistration userRegistration) {
        // 处理注册逻辑
        return "User registered successfully";
    }
}