Question

我无法在服务器上执行任何上传操作。与“玩游戏可以做的五件很酷的事情之一”相反，以下似乎不起作用：

    public static void doSingleFileUpload(
            Long id, @Required java.io.File upload,  String description, String title
            ) {
        Score score = Score.findById(id);

        try {
            score.files.add(new File(doFileUpload(new FileInputStream(upload), score), title));//PLAY crashes here, with a nullpointer exception on the upload parameter
        } catch (IOException ex) {
            //TODO: do something nice
        }
        score.save();
    }

doFileUpload看起来像这样：

@Check("registered")
private static String doFileUpload(InputStream is, Score score) throws IOException {
    //get Score from db
    //get dir if present
    java.io.File dir = new java.io.File("/public/uploads/" + play.templates.JavaExtensions.slugify(score.title));
    //if not, create
    if (!dir.exists()) {
        dir.mkdirs(); //create new dir if not present
    }
    //create file on server
    java.io.File newfile = new java.io.File(dir, "testfile.txt");
    OutputStream os = new FileOutputStream(newfile);
    IOUtils.copy(is, os);
    return newfile.getAbsolutePath();

}

有了这个观点：

<!-- ... -->
    <form action="@{ScoreController.doSingleFileUpload()}" method="POST" enctype="multipart/form-data">
    <input type="hidden" name="id" value="${score.id}" />
    <input type="file" id="upload" name="upload" />
    <input type="text" name="description" />
    <input type="hidden" name="title" value="${score.title}" />
    <input type="submit" value="submit" />
</form>

为什么upload为空？我发现了类似的问题here。但是当我在POST之后查看标题时，除了playsession键之外，其中的信息非常少......

我做错了什么？

我正在测试FF4并使用Play 1.1.1。

编辑：此示例应用程序适用于1.1.1和1.2。

控制器：

public class Application extends Controller {

public static void index() {
    File dir = new File(Play.applicationPath+File.separator+"public"+File.separator+"uploads");
    if (!dir.exists() && dir.isDirectory()) {
        renderText("something went wrong");
    } else {
        String[] files = dir.list();
        if (files != null) {
            render(dir);
        } else {
            render();
        }
    }
}

public static void upload(File upload) throws FileNotFoundException, IOException {
    File dir = new File(Play.applicationPath+File.separator+"public"+File.separator+"uploads");
    if (!dir.exists()) {
        dir.mkdirs();
    }
    File newfile = new File(dir, upload.getName());
    FileInputStream fis = new FileInputStream(upload);
    FileOutputStream fos = new FileOutputStream(newfile);
    IOUtils.copy(fis, fos);
    index();
}

}

查看：

#{extends 'main.html' /}
#{set title:'Home' /}

#{form @Application.upload(), enctype:'multipart/form-data'}
<input type="file" name="upload" />
<input type="submit" />
#{/form}
#{if (dir.list()!=null)}
<ul>
    #{list items:dir.list(), as:'file'}
    <li><a href="public/uploads/${file}">${file}</a></li>
    #{/list}
</ul>
#{/if}

现在问题是：应用程序之间有什么区别，除了第一个应用程序有更多参数......

感谢大家到目前为止的帮助！

问候，碧玉

Answer 1

这会编译吗？您将java.io.File对象传递给doFileUpload，其第一个参数为InputStream。

Answer 2

不确定为什么你的代码不起作用，但是通过使用Blob而不是File，我得到了类似的工作。

public static void update(long userId, 
                          String aboutMyself, 
                          String location, 
                          Blob profilePicBlob) {

    UserProfile userProfile = UserProfile.find("select distinct upr from UserProfile upr where upr.user.id = ?", userId).first();
    if(profilePicBlob != null) {
        //TODO: Delete the old profile pic
        userProfile.profilePic = new Pic(profilePicBlob).save();
    }
    userProfile.aboutMyself = aboutMyself;
    userProfile.location = location;
    userProfile.save();

    show(userId);
}

@Entity
public class Pic extends Model {
    public Blob image;

    public Pic(Blob image) {
        this.image = image;
    }
}

#{form @UserProfileC.update(userProfile.user.id), enctype:'multipart/form-data'}
    <div>
        <div>About Myself:</div>
        <textarea rows="10" cols="80" name="aboutMyself">${userProfile.aboutMyself</textarea>
    </div>
    <div> 
        <div>Location</div>
        <input type="text" name="location" value="${userProfile.location}"/>
</div>
    <div>                   
        <input type="file" name="profilePicBlob" />
        <label>${userProfile.profilePic == null ? 'Upload' : 'Change'} profile pic</label>
    </div>
    <div>
        <input type="submit" value="Submit" id="postComment" />
    </div>
#{/form}

基本文件上传失败

2 个答案: