我想使用primefaces和hibernate上传图像，但是当我做这个简单的JDBC连接但我在Hibernate中需要它时，它会给出以下错误。当我尝试它休眠然后它也需要隐蔽当我尝试这下面给出然后它给出错误。如果有人有想法那么请帮助
exception
javax.servlet.ServletException: java.lang.ClassCastException: [B cannot be cast to java.sql.Blob
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:77)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
javax.faces.el.EvaluationException: java.lang.ClassCastException: [B cannot be cast to java.sql.Blob
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:98)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
javax.faces.component.UICommand.broadcast(UICommand.java:311)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:77)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ClassCastException: [B cannot be cast to java.sql.Blob
org.hibernate.type.BlobType.set(BlobType.java:49)
org.hibernate.type.BlobType.nullSafeSet(BlobType.java:117)
org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1947)
org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:1924)
org.hibernate.persister.entity.AbstractEntityPersister$1.bindValues(AbstractEntityPersister.java:2102)
org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:32)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2108)
org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2588)
org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:290)
org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:180)
org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:108)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
com.school.entityDao.SchoolStudentDao.saveStudent(SchoolStudentDao.java:37)
com.school.entity.SchoolStudent.saveStudent(SchoolStudent.java:381)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.el.parser.AstValue.invoke(AstValue.java:278)
org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:273)
com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
javax.faces.component.UICommand.broadcast(UICommand.java:311)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:308)
org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:77)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
The code i have done for the uploading for hibernate is
private UploadedFile file;
private byte[] image;
public byte[] getImage() {
return image;
}
public void setImage(byte[] image) {
this.image = image;
}
public UploadedFile getFile() {
return file;
}
public void setFile(UploadedFile image) {
this.file = image;
}
the above one is for the Managed bean and for saving is
public void saveStudent(SchoolStudent schoolStudent)
{
Transaction trans=null;
Session session= HiberUtil.getSessionFactory().openSession();
File f=new File("C:\\Users\\Web It Experts\\Desktop\\New Instructions\\20.jpg");
byte[] imageData=new byte[(int) f.length()];
try{
trans=session.beginTransaction();
FileInputStream fileInputStream = new FileInputStream(f);
fileInputStream.read(imageData);
fileInputStream.close();
}
catch(Exception e)
{
e.printStackTrace();
}
schoolStudent.setImage(imageData);
session.save(schoolStudent);
session.getTransaction().commit();
}
答案 0 :(得分：0)
您应该将字节数组转换为java.sql.Blob。示例代码如下所示。
import java.sql.Blob;
import javax.sql.rowset.serial.SerialBlob;
...
byte[] imageData = .....;
try {
Blob blob = new SerialBlob(imageData);
schoolStudent.setImage(blob);
} catch (SQLException ex) {
...
}