File upload 基本文件上载失败
我无法在服务器上执行任何上载操作。与玩游戏可以做的五件很酷的事情中的一件相反,以下几点似乎不起作用:File upload 基本文件上载失败,file-upload,playframework,File Upload,Playframework,我无法在服务器上执行任何上载操作。与玩游戏可以做的五件很酷的事情中的一件相反,以下几点似乎不起作用: public static void doSingleFileUpload( Long id, @Required java.io.File upload, String description, String title ) { Score score = Score.findById(id); try
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如下所示:
@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();
}
基于这一观点:
<!-- ... -->
<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>
}
视图:
现在的问题是:除了第一个应用程序有更多的参数之外,应用程序之间的区别是什么
谢谢大家迄今为止的帮助
您好,
jasper不确定您的代码为什么不起作用,但我通过使用Blob而不是File获得了类似的效果
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>${userProfile.profilePic == null ? 'Upload' : 'Change'} profile pic</label>
</div>
<div>
<input type="submit" value="Submit" id="postComment" />
</div>
#{/form}
它编译吗?您正在将java.io.File对象传递给doFileUpload,其第一个参数是InputStream。您使用的是什么版本的Play,doFileUpload的代码是什么样子的。如果是公共静态,那么您的代码将无法工作。谢谢您的回答!我已经用你的答案编辑了我的帖子。。。它不是一个公共方法,但这并不能解释上传的空值,或者是吗?这个例子太复杂了,我在看答案的同时编写代码,因此用不同版本的应用程序编辑我的文章。我将用一个非常简单的文件上传应用程序编辑我的第一篇文章。谢谢你的回答。希望很快收到你的来信!谢谢你的帮助,谢谢!但是在开发过程的这个阶段,我不能对数据库结构进行任何更改。我不确定是否也要将所有二进制文件存储在数据库中。。。但我真的很感谢你的努力!
#{extends 'main.html' /}
#{set title:'Home' /}
#{form @Application.upload(), enctype:'multipart/form-data'}
<input type="file" name="upload" />
<input type="submit" />
#{/form}
#{if (dir.list()!=null)}
<ul>
#{list items:dir.list(), as:'file'}
<li><a href="public/uploads/${file}">${file}</a></li>
#{/list}
</ul>
#{/if}
public static void update(long userId,
String aboutMyself,
String location,
Blob profilePicBlob) {
UserProfile userProfile = UserProfile.find("select distinct upr from UserProfile upr where upr.user.id = ?", userId).first();
if(profilePicBlob != null) {
//TODO: Delete the old profile pic
userProfile.profilePic = new Pic(profilePicBlob).save();
}
userProfile.aboutMyself = aboutMyself;
userProfile.location = location;
userProfile.save();
show(userId);
}
@Entity
public class Pic extends Model {
public Blob image;
public Pic(Blob image) {
this.image = image;
}
}
#{form @UserProfileC.update(userProfile.user.id), enctype:'multipart/form-data'}
<div>
<div>About Myself:</div>
<textarea rows="10" cols="80" name="aboutMyself">${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}