2
請幫我查找Play Framework 2(Java)中的多文件上傳示例。在Play Framework 2中製作多文件上傳的示例
我試試這個代碼:
public static Result saveImages() {
File dir = new File(Play.application().path() + File.separator + "public" + File.separator + "uploads");
if (!dir.exists()) {
dir.mkdirs();
}
FileOutputStream moveTo = null;
String filename = request().headers().get("x-file-name").toString();
Logger.info("Name of the file " + filename);
return ok();
}
筆者認爲:
<form action="save_image" method="POST" enctype="multipart/form-data">
<input type="file" name="image" />
<input type="submit" value="save">
</form>
但是這個代碼給我一個錯誤NullPointerException
在行:
String filename = request().headers().get("x-file-name").toString();
堆棧跟蹤:
[error] application -
! @6dkiaiban - Internal server error, for (POST) [/save_image] ->
play.api.Application$$anon$1: Execution exception[[NullPointerException: null]]
at play.api.Application$class.handleError(Application.scala:289) ~[play_2.10.jar:2.1.0]
at play.api.DefaultApplication.handleError(Application.scala:383) [play_2.10.jar:2.1.0]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:132) [play_2.10.jar:2.1.0]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:128) [play_2.10.jar:2.1.0]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.0]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.0]
java.lang.NullPointerException: null
at controllers.Realty.saveImages(Realty.java:76) ~[na:na]
at Routes$$anonfun$routes$1$$anonfun$applyOrElse$9$$anonfun$apply$9.apply(routes_routing.scala:253) ~[na:na]
at Routes$$anonfun$routes$1$$anonfun$applyOrElse$9$$anonfun$apply$9.apply(routes_routing.scala:253) ~[na:na]
at play.core.Router$HandlerInvoker$$anon$6$$anon$2.invocation(Router.scala:141) ~[play_2.10.jar:2.1.0]
at play.core.Router$Routes$$anon$1.invocation(Router.scala:322) ~[play_2.10.jar:2.1.0]
at play.core.j.JavaAction$$anon$1.call(JavaAction.scala:31) ~[play_2.10.jar:2.1.0]
複製/粘貼堆棧跟蹤作爲[編輯問題](http://stackoverflow.com/posts/15519830/edit)。這也有助於發佈[SSCCE](http://sscce.org/),以便我們匹配行號。 – 2013-03-20 09:41:44
我還在此主題中添加了堆棧跟蹤和我的查看錶單 – guyver 2013-03-20 09:56:35
是否存在您不明白的「SSCCE」的某些部分? – 2013-03-20 13:18:33