玩！ 2.1 Java完整的基本文件上传解决方案? [英] Play! 2.1 Java complete basic file upload solution?

问题描述

我的控制器中具有以下基本操作(出于说明目的)，该基本操作已传递给MultipartFormData对象并检索图像和文件名.如果不为null，则将文件名打印到sbt控制台(确实如此)，然后根据播放 http://www.playframework.com/documentation/2.1.0/JavaFileUpload 文档有望将其保存到file.renameTo中指定的目录中(女巫不是).

I have the following basic Action (for illustration purposes) in my controller that is passed a MultipartFormData object and retrieves the image and file name. If not null then prints the file name to the sbt console (witch it does) and then according to play http://www.playframework.com/documentation/2.1.0/JavaFileUpload documentation hopefully save it to the directory specified in file.renameTo (witch is does not).

public static Result uploadProductImage(
        Http.MultipartFormData body
) {
    Http.MultipartFormData.FilePart image = body.getFile("image");

    if (image != null) {
        String fileName = image.getFilename();
        System.out.println(fileName);
        File file = image.getFile();
        file.renameTo(new File("/public/images/products", fileName));
    }
    return products();
}

我找不到任何文档的部分是您实际上如何将此文件移动到play项目的公用文件夹中.我注意到scala家伙具有功能

The part that I can't find any documentation on is how you actually move this file in to the public folder of the play project. I noticed the scala guys have the function

ref.moveTo()

我知道至少还有2到3个其他类似的问题，但是它们没有描述如何将文件移动到项目目录.我在这里根本上错过了一些非常简单的东西，但是我找不到它记录在网上的任何地方.

I know that there are at least 2 to 3 other questions that are similar but they do not describe how to move the file to a project directory. I'm missing something fundamentally very simple here but I cannot find it documented anywhere on the net.

推荐答案

经进一步检查，结果发现播放首先将上载的图像保存到系统特定的临时目录中，在我的情况下为/tmp/.

On further inspection it turns out that play first saves the uploaded image to the system specific temporary directory that in my case was /tmp/.

我的linux系统设置了三个分区:-

My linux system is set up with with three partitions:-

/boot
/
/home

play安装位于/home分区上，从逻辑上与tmp所在的/分开.在这种情况下，分区被视为单独的文件系统.

The play installation is located on the /home partition, logically separated from / where tmp resides. In this case the partitions are treated as separate file systems.

javadoc状态:-

javadoc states:-

重命名操作可能无法将文件从一个文件系统移动到另一个文件系统

这意味着File.renameTo()可能无法在两个不同的分区，磁盘或文件系统上运行，这取决于系统.这是.renameTo()失败的原因.

Meaning that depending on the system there's a chance that File.renameTo() may not operate across two different partitions, disks or filesystems. This is the reason that .renameTo() was failing.

解决方案:-

使用apache commons io FileUtils.moveFile()

Use apache commons io FileUtils.moveFile()

在Build.scala中添加"org.apache.directory.studio" % "org.apache.commons.io" % "2.4"

val appDependencies = Seq(
    javaCore, jdbc, javaJdbc, javaEbean,
    "org.apache.directory.studio" % "org.apache.commons.io" % "2.4"
)

在播放控制台中，使用play clean compile.

In the play console use play clean compile.

如果使用IDEA play idea

public static Result uploadProductImage(
        Http.MultipartFormData body
) {
    Http.MultipartFormData.FilePart image = body.getFile("image");

    if (image != null) {
        String fileName = image.getFilename();
        File file = image.getFile();
        try {
            FileUtils.moveFile(file, new File("public/images/products", fileName));
        } catch (IOException ioe) {
            System.out.println("Problem operating on filesystem");
        }
    }
    return products();
}

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