package com.yese.pojo;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.*;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class User {
 /**
 * 用戶ID
 */
 @NotNull(message = "用戶id不能為空")
 private Long userId;

 /**
 * 用戶名
 */
 @NotBlank(message = "用戶名不能為空")
 @Length(max = 20, message = "用戶名不能超過10個字符")
 @Pattern(regexp = "^[\\u4E00-\\u9FA5A-Za-z0-9\\*]*$", message = "用戶名限制：最多10字符，包含文字、字母和數字")
 private String username;

 /**
 * 密碼
 */
 @NotBlank(message = "密碼不能為空")
 private String password;

 /**
 * 手機號
 */
 @NotBlank(message = "手機號不能為空")
 @Pattern(regexp = "^[1][3,4,5,6,7,8,9][0-9]{9}$", message = "手機號格式有誤")
 private String mobile;

 /**
 * 性別
 */
 @NotNull(message = "性別不能為空")
 private Integer sex;

 /**
 * 年齡
 */
 @NotNull(message = "年齡不能為空")
 @Min(value = 1, message = "年齡最小為1歲")
 @Max(value = 120, message = "年齡最大為120歲")
 private Integer age;

 /**
 * 郵箱
 */
 @NotBlank(message = "郵箱不能為空")
 @Email(message = "郵箱格式錯誤")
 private String email;

}

package com.yese.controller;

import com.yese.pojo.User;
import lombok.extern.slf4j.Slf4j;
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
@Slf4j
public class UserController {

 /**
 * controller方法的入參里面在實體類前面加上@Validated
 */
 @PostMapping("/user")
 public void add(@RequestBody @Validated User user) {
 log.info("user====={}", user);
 }

}

package com.yese.config;


import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import javax.validation.ConstraintViolationException;
import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;

/**
 * 全局異常處理器
 */
@RestControllerAdvice
public class GlobalExceptionHandler {
 /**
 * post方式提交json數據,參數校驗失敗后,會拋出一個MethodArgumentNotValidException
 */
 @ExceptionHandler(MethodArgumentNotValidException.class)
 public Map<String, Object> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
 // 獲取所有的錯誤
 // List<FieldError> fieldErrors = e.getBindingResult().getFieldErrors();
 // 獲取錯誤提示
 // System.out.println(fieldErrors.get(0).getDefaultMessage());
 // 獲取錯誤字段
 // System.out.println(fieldErrors.get(0).getField());

 // 將所有的錯誤提示使用";"拼接起來并返回
 StringJoiner sj = new StringJoiner(";");
 e.getBindingResult().getFieldErrors().forEach(x -> sj.add(x.getDefaultMessage()));

 // 此處通常定義一個全局相應對象返回
 Map<String, Object> map = new HashMap<>();
 // 此處狀態碼可以通過枚舉或者常量定義
 map.put("code", 1001);
 map.put("msg", sj.toString());
 return map;
 }

 /**
 * get方式提交參數,參數校驗失敗后,會拋出一個ConstraintViolationException
 */
 @ExceptionHandler(ConstraintViolationException.class)
 public Map<String, Object> handleConstraintViolationException(ConstraintViolationException e) {
 StringJoiner sj = new StringJoiner(";");
 e.getConstraintViolations().forEach(x -> sj.add(x.getMessage()));

 Map<String, Object> map = new HashMap<>();
 map.put("code", 1001);
 map.put("msg", sj.toString());
 return map;
 }

}