相关问题：Maven Exec Plugin not reading configuration
在我的配置中，我需要一个参数，它是一个文件路径。我发现了一个相当“脏”的解决方法，用POM中的引号包围参数（“脏”，因为参数将使用这些引号传递给main方法，它们必须在代码中再次删除。）
<configuration>
<executable>java</executable>
<arguments>
<argument>"path to file"</argument>
</arguments>
</configuration>
但是我找不到将路径作为命令行参数传递的解决方案：
>mvn exec:java -Dexec.args="path to file"
答案 0 :(得分：8)
通常，如果参数值中有空格，maven需要引用整个参数。
mvn exec:java "-Dexec.args=path to file"
答案 1 :(得分：3)
在命令行中，您可以尝试使用单引号（但我不确定它是否有效），例如：
>mvn exec:java -Dexec.args="'path to file' arg2 arg3"
答案 2 :(得分：2)
使用-Dexec.args="'space parameter' normalparameter 'one more space parameter'"
我在Windows上尝试过它并且有效。
答案 3 :(得分：1)
如果您希望在命令行中尝试：$ mvn exec:java -Dexec.args="path\ to\ file arg2 arg3"
答案 4 :(得分：0)
尝试static Stream<List<User>> getSpecifiedUsersStreamWithDistance(
{@required User loggedInUser, @required List<String> uids}) {
try {
List<Stream<User>> listOfStreams = [];
for (var uid in uids) {
Stream<User> streamToAdd = _fireStore
.collection('users')
.where('email', isEqualTo: uid)
.snapshots()
.map((snap) => snap.documents
.map((doc) => User.fromMap(map: doc.data))
.map((user) {
user.updateDistanceToOtherUser(otherUser: loggedInUser);
return user;
}).toList()[0]);
listOfStreams.add(streamToAdd);
}
Stream<List<User>> usersStream = ZipStream.list(listOfStreams);
return usersStream;
} catch (e) {
print(e);
return null;
}
}
（而不是import UIKit
class ViewController: UIViewController, LogInViewDelegate, SignUpViewDelegate
{
@IBOutlet weak var logInSignUpControl: UISegmentedControl!
@IBOutlet weak var containerView: UIView!
var logInVC: LogInViewController?
var signUpVC: SignUpViewController?
var activeVC = 0
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view.
initializeCustomControllers()
}
func initializeCustomControllers()
{
let storyboard = UIStoryboard(name: "Main", bundle: nil)
logInVC = storyboard.instantiateViewController(withIdentifier: "LogInViewController") as? LogInViewController
signUpVC = storyboard.instantiateViewController(withIdentifier: "SignUpViewController") as? SignUpViewController
logInVC?.delegate = self
signUpVC?.delegate = self
logInVC?.willMove(toParent: self)
logInVC?.view.frame = containerView.bounds
containerView.addSubview(logInVC!.view)
addChild(logInVC!)
logInVC?.didMove(toParent: self)
}
func swapCustomController(from: UIViewController,to: UIViewController)
{
from.view.removeFromSuperview()
from.removeFromParent()
to.willMove(toParent: self)
to.view.frame = containerView.bounds
containerView.addSubview(to.view)
addChild(to)
to.didMove(toParent: self)
}
@IBAction func logInSignUpControlTapped(_ sender: Any)
{
switch logInSignUpControl.selectedSegmentIndex
{
case 0:
if activeVC == 1
{
swapCustomController(from: signUpVC!, to: logInVC!)
activeVC = 0
}
case 1:
if activeVC == 0
{
swapCustomController(from: logInVC!, to: signUpVC!)
activeVC = 1
}
default:
break
}
}
func logInAttempted(error: Error?)
{
if error == nil
{
// segue
print("log in successful")
}
else
{
showAlert(title: "Log In error",
message: error?.localizedDescription ?? "Unknown Error")
}
}
func signUpAttempted(error: Error?)
{
showAlert(title: "Sign Up Error",
message: error?.localizedDescription ?? "Unknown Error")
}
}
）