我希望有人可以在这里帮助我。我正在尝试创建一个可以上传一个或多个 mp3 文件并将其属性添加到数据库（歌曲标题、专辑等）的上传程序。我不确定我遇到的问题是因为数据库问题还是因为我不太了解 CommonsMultipartFile 的工作原理。无论如何，这是我的代码”
看法：
<g:form name="fileupload" url="[action:'uploads',controller:'fileResource']" method="POST" enctype="multipart/form-data">
<span>Add files...</span>
<input type="file" name="files" multiple>
</g:form>
文件资源：
def uploads = {
Collection result = []
if (request instanceof MultipartHttpServletRequest) {
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
CommonsMultipartFile file = (CommonsMultipartFile)multiRequest.getFile("files");
println"one"
moveFile(file)
println"three"
result << [name: file.originalFilename, size:file.size]
}
render result as JSON
}
private moveFile(CommonsMultipartFile file){
println"two"
try{
def userId = getUserId()
def newFileName = java.util.UUID.randomUUID().toString()
def userGuid = SecUser.get(userId.id).uid
def webRootDir = servletContext.getRealPath("/")
File myFile = new File( webRootDir + "/myUsers/${userGuid}/music",newFileName + ".")
file.transferTo(myFile)
MP3File mp3file = new MP3File(myFile);
String duration = mp3file.getAudioHeader().getTrackLength()
String bitRate = mp3file.getAudioHeader().getBitRate()
String encodingType = mp3file.getAudioHeader().getEncodingType()
String getFormat = mp3file.getAudioHeader().getFormat()
String trackLength = mp3file.getAudioHeader().getTrackLength()
String fileName = file.originalFilename
String artistName = ""
String albumName = ""
String songName = ""
def getArtistId=""
try{
if (mp3file.hasID3v2Tag()){
//println("has id3v2 tag")
ID3v24Tag id3v24tag = mp3file.getID3v2TagAsv24();
artistName = (id3v24tag.getFirst(ID3v24Frames.FRAME_ID_ARTIST).trim())
albumName = (id3v24tag.getFirst(ID3v24Frames.FRAME_ID_ALBUM).trim())
songName = (id3v24tag.getFirst(ID3v24Frames.FRAME_ID_TITLE).trim())
}else if (mp3file.hasID3v1Tag()) {
//println("has id3v1 tag")
ID3v1Tag tag = mp3file.getID3v1Tag();
artistName = tag.getFirst(FieldKey.ARTIST).trim()
albumName = tag.getFirst(FieldKey.ALBUM).trim()
songName = tag.getFirst(FieldKey.TITLE).trim()
}
else{
println("this format not yet supported:" + getFormat)
}
}catch (Exception ex) {
log.error("ERROR: FILE NOT PROCESSED")
}
try{
def oArtist = ""
def c = Artist.createCriteria()
def getMyArtist = c.get {
eq('artistName', artistName )
secUser {
eq('id', userId.id)
}
}
if (getMyArtist == null){
//artist does not exist
// 1c. add artist
// 1d. add album
// 1e. add song
// 1f. move song
// 1g. DONE
oArtist= new com.jason.score.Artist(
artistName : artistName ,
secUser : userId.id
)
userId.addToArtist(oArtist).save(flush:true)
def oAlbum = new Album
(
albumName: albumName
)
oArtist.addToAlbum(oAlbum).save(flush:true)
def oSong = new Song
(
fileLocation: webRootDir + "myUsers/${userGuid}/music/",
songBitRate: bitRate,
songDuration: duration,
songEncodeType: encodingType,
songName: songName
)
oAlbum.addToSong(oSong).save(flush:true)
}else{
//artist exists with that username
//need album name and artist id
def d = Album.createCriteria()
def getMyAlbum = d.get {
eq('albumName', albumName )
artist {
eq('id', getMyArtist.id)
}
}
if(getMyAlbum == null){
// 3. add album
// 3a. add song
// 3b. move song
// 3c. DONE
Artist findArtist = Artist.get(getMyArtist.id)
def oAlbum = new Album
(
albumName: albumName
)
findArtist.addToAlbum(oAlbum).save(flush:true)
def oSong = new Song
(
fileLocation: webRootDir + "myUsers/${userGuid}/music/",
songBitRate: bitRate,
songDuration: duration,
songEncodeType: encodingType,
songName: songName
)
oAlbum.addToSong(oSong).save(flush:true)
}else{
//album does exist
//check if song exists with album id
def e = Song.createCriteria()
def getMySong = e.get {
eq('songName', songName )
album {
eq('id', getMyAlbum.id)
}
}
if (getMySong==null){
Album findAlbum = Album.get(getMyAlbum.id)
def oSong = new Song
(
fileLocation: webRootDir + "myUsers/${userGuid}/music/",
songBitRate: bitRate,
songDuration: duration,
songEncodeType: encodingType,
songName: songName
)
findAlbum.addToSong(oSong).save(flush:true)
}else{
//it already exists, so do nothing
}
}
}
}catch (Exception ex){
log.error("ERROR: ADDING TO DB: " + ex)
}
}catch (Exception ex){
log.error("error" + ex)
}
}
private getUserId(){
return SecUser.get(springSecurityService.principal.id)
}
private getUser(){
return SecUser.get(springSecurityService.principal)
}
我得到的错误是：
2012-01-02 14:25:25,314 [http-8080-1] ERROR events.PatchedDefaultFlushEventListener - Could not synchronize database state with session
org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.jason.score.SecUser#1]
at org.hibernate.persister.entity.AbstractEntityPersister.check(AbstractEntityPersister.java:1792)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2435)
at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335)
at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635)
at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168)
at org.codehaus.groovy.grails.orm.hibernate.events.PatchedDefaultFlushEventListener.performExecutions(PatchedDefaultFlushEventListener.java:46)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
at org.springframework.orm.hibernate3.HibernateTemplate$28.doInHibernate(HibernateTemplate.java:883)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.flush(HibernateTemplate.java:881)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.SavePersistentMethod$1.doInHibernate(SavePersistentMethod.java:58)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:339)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.SavePersistentMethod.performSave(SavePersistentMethod.java:53)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractSavePersistentMethod.doInvokeInternal(AbstractSavePersistentMethod.java:179)
at org.codehaus.groovy.grails.orm.hibernate.metaclass.AbstractDynamicPersistentMethod.invoke(AbstractDynamicPersistentMethod.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSite.invoke(PojoMetaMethodSite.java:188)
....
2012-01-02 14:25:25,379 [http-8080-1] ERROR errors.GrailsExceptionResolver - 处理请求时发生异常：[POST] /com.jason.score/fileResource/uploads Stacktrace 如下：org.springframework.orm。 hibernate3.HibernateOptimisticLockingFailureException：具有标识符 [1] 的类 [com.jason.score.SecUser] 的对象：乐观锁定失败；嵌套异常是 org.hibernate.StaleObjectStateException：行已被另一个事务更新或删除（或未保存的值映射不正确）：[com.jason.score.SecUser#1] at java.lang.Thread.run(Thread.java :662) 原因：org.hibernate.StaleObjectStateException：行已被另一个事务更新或删除（或未保存的值映射不正确）：[com.jason.score.SecUser#1] ... 1 更多