第一步,引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
@Data
public class ValidVO {
private String id;
@Length(min = 6,max = 12,message = "appId长度必须位于6到12之间")
private String appId;
@NotBlank(message = "名字为必填项")
private String name;
@Email(message = "请填写正确的邮箱地址")
private String email;
private String sex;
@NotEmpty(message = "级别不能为空")
private String level;
}
常见的约束注解如下:
注解 | 功能 |
---|---|
@AssertFalse | 可以为null,如果不为null的话必须为false |
@AssertTrue | 可以为null,如果不为null的话必须为true |
@DecimalMax | 设置不能超过最大值 |
@DecimalMin | 设置不能超过最小值 |
@Digits | 设置必须是数字且数字整数的位数和小数的位数必须在指定范围内 |
@Future | 日期必须在当前日期的未来 |
@Past | 日期必须在当前日期的过去 |
@Max | 最大不得超过此最大值 |
@Min | 最大不得小于此最小值 |
@NotNull | 不能为null,可以是空 |
@Null | 必须为null |
@Pattern | 必须满足指定的正则表达式 |
@Size | 集合、数组、map等的size()值必须在指定范围内 |
必须是email格式 | |
@Length | 长度必须在指定范围内 |
@NotBlank | 字符串不能为null,字符串trim()后也不能等于“” |
@NotEmpty | 不能为null,集合、数组、map等size()不能为0;字符串trim()后可以等于“” |
@Range | 值必须在指定范围内 |
@URL | 必须是一个URL |
@RestController
@Slf4j
@Validated
public class ValidController {
@ApiOperation("RequestBody校验")
@PostMapping("/valid/test1")
public String test1(@Validated @RequestBody ValidVO validVO){
log.info("validEntity is {}", validVO);
return "test1 valid success";
}
@ApiOperation("Form校验")
@PostMapping(value = "/valid/test2")
public String test2(@Validated ValidVO validVO){
log.info("validEntity is {}", validVO);
return "test2 valid success";
}
@ApiOperation("单参数校验")
@PostMapping(value = "/valid/test3")
public String test3(@Email String email){
log.info("email is {}", email);
return "email valid success";
}
}
参数异常加入全局异常处理器
@ExceptionHandler(value = {BindException.class, ValidationException.class, MethodArgumentNotValidException.class})
public ResponseEntity<ResultData<String>> handleValidatedException(Exception e) {
ResultData<String> resp = null;
if (e instanceof MethodArgumentNotValidException) {
// BeanValidation exception
MethodArgumentNotValidException ex = (MethodArgumentNotValidException) e;
resp = ResultData.fail(HttpStatus.BAD_REQUEST.value(),
ex.getBindingResult().getAllErrors().stream()
.map(ObjectError::getDefaultMessage)
.collect(Collectors.joining("; "))
);
} else if (e instanceof ConstraintViolationException) {
// BeanValidation GET simple param
ConstraintViolationException ex = (ConstraintViolationException) e;
resp = ResultData.fail(HttpStatus.BAD_REQUEST.value(),
ex.getConstraintViolations().stream()
.map(ConstraintViolation::getMessage)
.collect(Collectors.joining("; "))
);
} else if (e instanceof BindException) {
// BeanValidation GET object param
BindException ex = (BindException) e;
resp = ResultData.fail(HttpStatus.BAD_REQUEST.value(),
ex.getAllErrors().stream()
.map(ObjectError::getDefaultMessage)
.collect(Collectors.joining("; "))
);
}
return new ResponseEntity<>(resp,HttpStatus.BAD_REQUEST);
}