在Play Framework中通过GET请求发送日期参数的理想方式是什么？ [英] What is the ideal way to send a date parameter over a GET request in Play Framework?
问题描述
当尝试在路由中执行此操作时文件，
GET / food / fetchMealInfo /：noOfDays /：dateSelected controllers.trackandplan.FoodController.fetchMealInfo（noOfDays：Integer，dateSelected ：日期）
我收到错误说
没有找到编译错误
：类型日期
将前端AngularJS应用程序中的日期对象从Play Framework中传递到Java应用程序的正确，安全和干净的方法是什么？
请指导。
你有几个选项。稍微更容易理解的方法是简单地将日期/时间作为 Long （unix timestamp）发送，并将其转换为 Date 在控制器方法中。
GET / food / fetchMealInfo /：noOfDays /：dateSelected controllers.trackandplan.FoodController。 fetchMealInfo（noOfDays：Integer，dateSelected：Long）
public static Result fetchMealInfo（Integer noOfDays，Long dateSelected）{
Date date = new Date（dateSelected.longValue（））;
...
}
更复杂的方式是使用 PathBindable ，这将允许您在路由文件中使用 Date 本身。但是，您仍然需要将 Date 作为 Long （ PathBindable 将尽可能进行转换）。不幸的是，由于我们显然无法控制 Date ，所以我们必须在Scala中实现 PathBindable ，而不是Java （Java将需要实现 Date 的接口，我们不能）。
应用/ libs / PathBinders.scala
package com.example.libs
import java。 util.Date
import play.api.mvc.PathBindable
import scala.util.Either
object PathBinders {
implicit def bindableDate（implicit longBinder ：PathBindable [Long]）= new PathBindable [Date] {
override def bind（key：String，value：String）：Either [String，Date] = {
longBinder.bind key，value）.right.map（new Date（_））
}
覆盖def unbind（key：String，date：Date）：String = key +=+ date .getTime（）。toString
}
}
为了让路线文件能够选择，哟您需要将以下内容添加到您的 build.sbt 文件中：
PlayKeys.routesImport + =com.example.libs.PathBinders._
PlayKeys.routesImport + =java.util.Date
现在您可以在路由文件中使用 Date （如 Long ），而不需要特别处理使用它的每个方法。
GET / food / fetchMealInfo /：noOfDays /：dateSelected controllers.trackandplan.FoodController.fetchMealInfo（noOfDays：Integer，dateSelected：Date）
注意：如果您使用的是较旧的Play版本，则可能无法立即编译。我使用Play 2.3.8和sbt 0.13.5进行了测试。
还可以修改 PathBindable 我在这里使用了一个基本的 String ，并接受一个特定的日期格式。
package com.example.libs
import java.util.Date
import java.text.SimpleDateFormat
import play.api.mvc.PathBindable
导入scala.util {否，失败，成功，尝试}
对象PathBinders {
implicit def bindableDate（implicit stringBinder：PathBindable [String]）= new PathBindable [Date ] {
val sdf = new SimpleDateFormat（yyyy-MM-dd）
override def bind（key：String，value：String）：Either [String，Date ] = {
for {
dateString< - stringBinder.bind（key，value）.right
date< - Try（sdf.parse（dateString））toOption.toRight（日期格式无效）。右
}收益日期
}
override def unbind（key：String，date：Date）：String = key +=+ sdf.format（date）
}
}
I am new to Play Framework. I am able to send simple data types like string, integer etc directly via the request and access them in the Back end Java method.
When I try doing this in the route file,
GET /food/fetchMealInfo/:noOfDays/:dateSelected controllers.trackandplan.FoodController.fetchMealInfo(noOfDays : Integer, dateSelected : Date)
I am getting an error saying
Compilation error
not found: type Date
What is the correct, safe and clean way to transfer a date object from a front end AngularJS application to the Java application in Play Framework. Please guide.
You have a couple options. The slightly easier way to understand is to simply transmit the date/time as a Long (unix timestamp), and convert it to a Date in the controller method.
GET /food/fetchMealInfo/:noOfDays/:dateSelected controllers.trackandplan.FoodController.fetchMealInfo(noOfDays: Integer, dateSelected: Long)
public static Result fetchMealInfo(Integer noOfDays, Long dateSelected) {
Date date = new Date(dateSelected.longValue());
...
}
The more sophisticated way would be to use a PathBindable, which would allow you to use Date within the routes file itself. However, you would still need to transmit the Date as a Long (the PathBindable would make the conversion if possible). Unfortunately, since we obviously don't have control over Date, we have to implement PathBindable in Scala, and not Java (Java would require implementing an interface for Date, which we can't).
app/libs/PathBinders.scala
package com.example.libs
import java.util.Date
import play.api.mvc.PathBindable
import scala.util.Either
object PathBinders {
implicit def bindableDate(implicit longBinder: PathBindable[Long]) = new PathBindable[Date] {
override def bind(key: String, value: String): Either[String, Date] = {
longBinder.bind(key, value).right.map(new Date(_))
}
override def unbind(key: String, date: Date): String = key + "=" + date.getTime().toString
}
}
In order for the routes file to be able to pick this up, you'll need to add the following to your build.sbt file:
PlayKeys.routesImport += "com.example.libs.PathBinders._"
PlayKeys.routesImport += "java.util.Date"
Now you can use Date within your routes file (as Long), without the need to handle it specially for every method that uses it.
GET /food/fetchMealInfo/:noOfDays/:dateSelected controllers.trackandplan.FoodController.fetchMealInfo(noOfDays: Integer, dateSelected: Date)
Note: This might not compile straight away if you're using an older Play version. I tested it with Play 2.3.8 and sbt 0.13.5.
It is also possible to modify the PathBindable I made here to use an underlying String instead, and accept a specific date format.
package com.example.libs
import java.util.Date
import java.text.SimpleDateFormat
import play.api.mvc.PathBindable
import scala.util.{Either, Failure, Success, Try}
object PathBinders {
implicit def bindableDate(implicit stringBinder: PathBindable[String]) = new PathBindable[Date] {
val sdf = new SimpleDateFormat("yyyy-MM-dd")
override def bind(key: String, value: String): Either[String, Date] = {
for {
dateString <- stringBinder.bind(key, value).right
date <- Try(sdf.parse(dateString)).toOption.toRight("Invalid date format.").right
} yield date
}
override def unbind(key: String, date: Date): String = key + "=" + sdf.format(date)
}
}
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