优雅的方式来校验spring-boot的form表单参数和jso

参数验证的目的

作为一个好的服务端的开发人员，对于外部传入的参数一定要做参数验证，我们使用springboot可以方便的利用内置的javax.validation包来进行参数的验证

RequestParam类型参数的验证

对于RequestParam类型参数的验证，需要在controller类上面加入@Validated注解

例子1

下面的例子就是简单的post方法中的form表单参数验证

@Validated
public class SampleWebParamValidController {

 @PostMapping("/param")
  public BaseResult param(
      @Max(value = 100, message = "int1不能大于100")
      @Min(value = 18, message = "int1不能小于18")
      @RequestParam Integer int1,
      @NotNull(message = "int2必须存在")
      @RequestParam Integer int2,
      @PositiveOrZero(message = "int3必须是正数或0")
      @RequestParam Integer int3,
      @RequestParam(required = false, defaultValue = "100") Integer int4,
      @NotEmpty(message = "str1不能为空")
      @RequestParam String str1,
      @Length(min = 2, max = 10, message = "str2长度在2~10字符")
      @RequestParam String str2,
      @AssertTrue(message = "bool1必须为正")
      @RequestParam Boolean bool1) {
    UserDomain userDomain = new UserDomain();
    userDomain.setBool1(bool1);
    userDomain.setInt1(int1);
    userDomain.setInt2(int2);
    userDomain.setInt4(int4);
    userDomain.setInt3(int3);
    userDomain.setStr1(str1);
    userDomain.setStr2(str2);
    return BaseResult.success(userDomain);
  }
}

例子2

下面的例子就是简单的post方法中的form表单中有复杂参数验证

@Validated
public class SampleWebParamValidController {
@PostMapping("/listParam")
  public BaseResult listParam(
      @Size(min = 1, max = 4, message = "list1长度元素必须是1-4个")
      @RequestParam List<String> list1) {
    UserDomain userDomain = new UserDomain();
    userDomain.setList1(list1);
    return BaseResult.success(userDomain);
  }
}

RequestBody类型参数的验证

对于RequestBody类型参数的验证，需要在@RequestBody参数前面加上@Valid注解

例子3

下面的例子就是简单的post方法中的单个requestbody中有参数验证

@PostMapping("/listBody")
  public BaseResult listBody(
      @Valid
      @Size(min = 1, max = 4, message = "list1长度元素必须是1-4个")
      @RequestBody List<String> list1) {
    UserDomain userDomain = new UserDomain();
    userDomain.setList1(list1);
    return BaseResult.success(userDomain);
  }

例子4

下面的例子就是简单的post方法中的requestbody中有对象参数验证

@PostMapping("/validReqeustBody")
  public BaseResult addUserErrorAge(@Valid @RequestBody UserDomain userDomain) {
    log.info("userDomain:{}", userDomain);
    return BaseResult.success(userDomain);
  }

@Data
public class UserDomain {

  @Max(value = 100, message = "int1不能大于100")
  @Min(value = 18, message = "int1不能小于18")
  private Integer int1;

  @NotNull(message = "int2必须存在")
  private Integer int2;

  @PositiveOrZero(message = "int3必须是正数或0")
  private Integer int3;

  private Integer int4 = 10;

  @NotEmpty(message = "str1不能为空")
  private String str1;

  @Length(min = 2, max = 10, message = "str2长度在2~10字符")
  private String str2;

  @Size(min = 1, max = 4, message = "list1长度元素必须是1-4个")
  private List<String> list1;

  @Size(min = 2, max = 6, message = "list2长度元素必须是2-6个")
  private List<Integer> list2;

  @AssertTrue(message = "bool1必须为正")
  private Boolean bool1;

}