Question

我在dropwizard项目中使用groovy并且在未指定@QueryParam时尝试返回404而不是500。

我尝试过使用javax.validation.constraints.NotNull以及com.sun.isstack.NotNull中的@NotNull标志，但都没有正常工作。

为了澄清，当用户没有输入其中一个特定参数的参数时，我想返回404：

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import (Column, Index, Date, DateTime, Numeric, BigInteger, String, ForeignKey, Boolean)

Base = declarative_base()

class Project(Base):
    """sqlalchemy ORM for my table."""
    __tablename__ = "table1"
    id = Column("id", BigIntegerID, primary_key=True, autoincrement=True)
    date = Column("date", Date, nullable=False)
    value = Column("value", Numeric(20, 8))
    ...
    ...

Answer 1

尝试为def a(): data = get_data_somewhere() for val in data: yield val def b(): a_gen = a() val = next(a_gen) try: while True: if val == "foo": received = yield val val = a_gen.send(received) else: val = a_gen.send(None) except StopIteration: pass finally: del a_gen（依赖项包含在Dropwizard中）：

com.google.common.base.Optional

如何验证@QueryParam为非null

1 个答案: