使用prime faces和Hibernate将图像上载到数据库
我想使用primefaces和hibernate上传图像，但是当我执行这个简单的JDBC连接示例时，它给出了以下错误，但我需要在hibernate中使用它。当我尝试休眠时，它也需要隐藏。当我尝试下面给出的方法时，它给出了错误。如果有人有想法，请帮忙使用prime faces和Hibernate将图像上载到数据库,hibernate,jsf,primefaces,Hibernate,Jsf,Primefaces,我想使用primefaces和hibernate上传图像，但是当我执行这个简单的JDBC连接示例时，它给出了以下错误，但我需要在hibernate中使用它。当我尝试休眠时，它也需要隐藏。当我尝试下面给出的方法时，它给出了错误。如果有人有想法，请帮忙 exception javax.servlet.ServletException: java.lang.ClassCastException: [B cannot be cast to java.sql.Blob javax.faces.
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();
}
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) {
...
}
那么我们就不需要try-and-catch块中的代码了？只是转换成blob，然后我想我必须保存在blob类型相同？请解释…@RohitKaushal“[B不能转换为java.sql.Blob”（[B是字节数组），因此您应该转换为java.sql.Blob。它可以工作，但您知道如何将上载的文件转换为文件，以便我可以通过从ui中选择文件来提供组件。@RohitKaushal您可以通过从上载的文件获取InputStream并将其放入DefaultStreamContent中来实现。在使用之后，文件对象是一个对象StreamContent。但是，您可以不能直接将上传文件转换为java.io.File您应该先写入某个路径，然后再读取它。InputStream input=schoolStudent.getFile（）.getInputstream（）；DefaultStreamContent d=new DefaultStreamedContent（input）；好的，我已经这样做了……现在如何将输入提供给java.io.File。。。