Java對象驗證框架 OVal

OVal 是一個可擴展的Java對象數據驗證框架，驗證的規則可以通過配置文件、Annotation、POJOs 進行設定。可以使用純 Java 語言、JavaScript 、Groovy 、BeanShell 等進行規則的編寫。

示例代碼：

private static class TestEntity
{
  @Min(1960)
  private int year = 1977;

  @Range(min=1, max=12)
  private int month = 2;

  @ValidateWithMethod(methodName = "isValidDay", parameterType = int.class)
  private int day = 31;

  private boolean isValidDay(int day)
  {
    GregorianCalendar cal = new GregorianCalendar();
    cal.setLenient(false);
    cal.set(GregorianCalendar.YEAR, year); 
    cal.set(GregorianCalendar.MONTH, month - 1);
    cal.set(GregorianCalendar.DATE, day);
    try {
      cal.getTimeInMillis(); // throws IllegalArgumentException
    } catch (IllegalArgumentException e) { 
      return false;
    }
    return true;
  }
}

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