SpringBoot实现通用的接口参数校验

public class AccountVO {
  private String name; // 姓名
  private Integer age; // 年龄
}

@Service
public class TestImpl implements ITestService {

  @Override
  @Check({"name", "age"})
  public void testValid(AccountVO vo) {
    // ...
  }

}

@Check({"id>=8", "name!=aaa", "title<10"})

updateUserId must not null while calling testValid
id must >= 8 while calling testValid
name must != aaa while calling testValid

@Check({"title<=8:标题字数不超过8个字，含标点符号"})
public void testValid(TestPO po) {
  // ...
}

  org.apache.commons
  commons-lang3
  3.3.2




  org.slf4j
  slf4j-api
  1.7.25

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * 参数校验 注解
 * Created by cipher on 2017/9/20.
 */
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RUNTIME)
public @interface Check {

  // 字段校验规则，格式：字段名+校验规则+冒号+错误信息，例如：id<10:ID必须少于10
  String[] value();

}

@Around(value = "@com.cipher.checker.Check") // 这里要换成自定义注解的路径
public Object check(ProceedingJoinPoint point) throws Throwable {
  Object obj;
  // 参数校验
  String msg = doCheck(point);
  if (!StringUtils.isEmpty(msg)) {
    // 这里可以返回自己封装的返回类
    throw new IllegalArgumentException(msg);
  }
  obj = point.proceed();
  return obj;
}

/**
 * 参数校验
 *
 * @param point ProceedingJoinPoint
 * @return 错误信息
 */
private String doCheck(ProceedingJoinPoint point) {
  // 获取方法参数值
  Object[] arguments = point.getArgs();
  // 获取方法
  Method method = getMethod(point);
  String methodInfo = StringUtils.isEmpty(method.getName()) &＃63; "" : " while calling " + method.getName();
  String msg = "";
  if (isCheck(method, arguments)) {
    Check annotation = method.getAnnotation(Check.class);
    String[] fields = annotation.value();
    Object vo = arguments[0];
    if (vo == null) {
      msg = "param can not be null";
    } else {
      for (String field : fields) {
        // 解析字段
        FieldInfo info = resolveField(field, methodInfo);
        // 获取字段的值
        Object value = ReflectionUtil.invokeGetter(vo, info.field);
        // 执行校验规则
        Boolean isValid = info.optEnum.fun.apply(value, info.operatorNum);
        msg = isValid &＃63; msg : info.innerMsg;
      }
    }
  }
  return msg;
}

/**
 * 操作枚举
 */
enum Operator {
  /**
   * 大于
   */
  GREATER_THAN(">", CheckParamAspect::isGreaterThan),
  /**
   * 大于等于
   */
  GREATER_THAN_EQUAL(">=", CheckParamAspect::isGreaterThanEqual),
  /**
   * 小于
   */
  LESS_THAN("<", CheckParamAspect::isLessThan),
  /**
   * 小于等于
   */
  LESS_THAN_EQUAL("<=", CheckParamAspect::isLessThanEqual),
  /**
   * 不等于
   */
  NOT_EQUAL("!=", CheckParamAspect::isNotEqual),
  /**
   * 不为空
   */
  NOT_NULL("not null", CheckParamAspect::isNotNull);

  private String value;
  private BiFunction fun;

  Operator(String value, BiFunction fun) {
    this.value = value;
    this.fun = fun;
  }
}