我有一个小项目，从数据库中读取/搜索数据包括图片。我已将primefaces-5.3.jar添加到我的项目中，而我的问题是，当我将用户照片更改为另一个时，它不会立即显示我的更改，而我可以在用户记录中看到其他更改（更新）并且仅当我刷新网页我能看到另一张图片。请帮帮我这个
这是我的代码：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:f="http://xmlns.jcp.org/jsf/core">
//....
<h:form id="searchform">
<!--1 Form for searching -->
<br/>
<br/>
<h:form id="searchform">
<p:outputLabel value="type the key"/>
<p:inputText value="#{personBean.searchinperson.searchAllUsingLikeOpSTRING}" required="true" requiredMessage="Please Enter the key"/>
<br/>
<p:commandButton value="Search by key" icon="ui-icon-search" action="#{personBean.displaySearchedPeopleList()}" update="searchform"/>
<p:dataTable id="searchdatatable_id" value="#{personBean.listofSeachedPeople}" var="person">
<p:column headerText="PersonId">
<p:outputLabel value="#{person.personid}"/>
</p:column>
<p:column headerText="FirstName">
<p:outputLabel value="#{person.firstname}"/>
</p:column>
<p:column headerText="LastName">
<p:outputLabel value="#{person.lastname}"/>
</p:column>
<p:column headerText="Age">
<p:outputLabel value="#{person.age}"/>
</p:column>
<p:column headerText="UserName">
<p:outputLabel value="#{person.username}"/>
</p:column>
<p:column headerText="Password" >
<p:outputLabel value="#{person.password}"/>
</p:column>
<p:column headerText="DataAddTime" >
<p:outputLabel value="#{person.dataaddtime}"/>
</p:column>
<p:column headerText="Person Photo">
<p:graphicImage value="#{personBeanApp.imageDisplay}" alt="no image" height="150" width="150">
<f:param value="#{person.personid}" name="image_id"/>
</p:graphicImage>
</p:column>
<p:column headerText="Modification">
<p:commandLink value="Modify" actionListener="#{personBean.readPersonID(person)}" oncomplete="PF('wdlgData').show();" update=":dlgDataform" />
</p:column>
<p:column headerText="Delete" style=" color: red;">
<p:commandLink value="Delete Person" actionListener="#{personBean.readPersonID(person)}" oncomplete="PF('wdlgconfirmation').show();" update=":dlgconfdelform" />
</p:column>
</p:dataTable>
</h:form>
<!-- Dialog for Modification column -->
<h:form id="dlgDataform">
<p:dialog header="Data" widgetVar="wdlgData" >
<h:panelGrid columns="2" cellpadding="5">
<p:outputLabel for="modifyDlgPersonid_id" value="PersonID"/>
<p:inputText id="modifyDlgPersonid_id" value="#{personBean.person.personid}" required="true" />
<p:outputLabel for="modifyDlgFirstname_id" value="FirstName"/>
<p:inputText id="modifyDlgFirstname_id" value="#{personBean.person.firstname}" required="true" />
<p:outputLabel for="modifyDlgLastname_id" value="LastName"/>
<p:inputText id="modifyDlgLastname_id" value="#{personBean.person.lastname}" required="true"/>
<p:outputLabel for="modifyDlgAge_id" value="Age"/>
<p:inputText id="modifyDlgAge_id" value="#{personBean.person.age}" required="true"/>
<p:outputLabel for="modifyDlgUsername_id" value="UserName"/>
<p:inputText id="modifyDlgUsername_id" value="#{personBean.person.username}" required="true"/>
<p:outputLabel for="modifyDlgPassword_id" value="Password"/>
<p:inputText id="modifyDlgPassword_id" value="#{personBean.person.password}" required="true"/>
</h:panelGrid>
<p:outputLabel value="add/alter Picture"/>
<p:fileUpload fileUploadListener="#{personBean.handleFileUploadForAdminModifyDlg}" mode="advanced" dragDropSupport="false"
update="adminModifyDlgUpload_msgs" sizeLimit="1000000" fileLimit="1" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />
<p:messages id="adminModifyDlgUpload_msgs" for="adminModifyDlgPicUpload" showDetail="true" autoUpdate="true" closable="true" />
<br/>
<br/>
<p:separator />
<p:messages for="dialogModAdmin" showDetail="true" autoUpdate="true" closable="true" />
<br/>
<p:commandButton value="Modify" actionListener="#{personBean.modificatePersonData()}" update=":searchform:searchdatatable_id" />
<h:outputText value=" " />
<p:commandButton value="Cancel/Close" immediate="true" oncomplete="PF('wdlgData').hide();"/>
</p:dialog>
</h:form>
PersonBean.java：
@ManagedBean
@SessionScoped
public class PersonBean {
private List<Person> listofSeachedPeople;
public List<Person> getListofSeachedPeople() {
return listofSeachedPeople;
}
public void setListofSeachedPeople(List<Person> listofSeachedPeople) {
this.listofSeachedPeople = listofSeachedPeople;
}
public void displaySearchedPeopleList() throws Exception
{
PersonDAO dao;
try{
dao=new PersonDAO();
listofSeachedPeople=dao.searchByAll(searchinperson);
}
catch(Exception ex){throw ex;}
}
public void readPersonID(Person per) throws Exception{
PersonDAO dao;
Person temp;
try{
dao=new PersonDAO();
temp=dao.readID(per);
if(temp!=null){ persId=temp.getPersonid();persPass=temp.getPassword();this.person=temp; }
}
catch(Exception ex){throw ex;}
}
public void modificatePersonData() throws Exception{
PersonDAO dao;
try{
dao=new PersonDAO();
if("personIdFree".equals(dao.IsPersonIdFreeExceptThis(person)) && "passwordFree".equals(dao.IsPasswordFreeExceptThis(person))){dao.modificate(person);FacesContext.getCurrentInstance().addMessage("dialogModAdmin", new FacesMessage(FacesMessage.SEVERITY_INFO, "Info", "The Data has been modified"));}
else {FacesContext.getCurrentInstance().addMessage("dialogModAdmin", new FacesMessage(FacesMessage.SEVERITY_ERROR, "Error!", "PersonID or Password is already in use"));}
this.displaySearchedPeopleList();
}
catch(Exception ex){throw ex;}
}
public void handleFileUploadForAdminModifyDlg(FileUploadEvent event) throws Exception {
try{
if(event.getFile()!=null){
uplf.setUploadedFile(event.getFile());
person.setPersonimage(IOUtils.toByteArray(uplf.getUploadedFile().getInputstream()));
FacesMessage message = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
FacesContext.getCurrentInstance().addMessage("adminModifyDlgPicUpload", message);}
}
catch(Exception ex){throw ex;}
}
PersonDAO.java：
public void modificate(Person per) throws Exception {
PreparedStatement pst;
Date date = new Date();
DateFormat df = new SimpleDateFormat("dd/MM/YYYY - hh:mm:ss");
try {
this.connectDB();
pst = this.getConn().prepareStatement("UPDATE person SET personid=?,firstname=?, lastname=?, age=?, username=?, password=?,dataaddtime=?,personimage=? WHERE personid=? ");
pst.setInt(1, per.getPersonid());
pst.setString(2, per.getFirstname());
pst.setString(3, per.getLastname());
pst.setInt(4, per.getAge());
pst.setString(5, per.getUsername());
pst.setString(6, per.getPassword());
pst.setString(7, df.format(date));
pst.setBytes(8,per.getPersonimage());
pst.setInt(9,PersonBean.getPersId());
pst.executeUpdate();
} catch (Exception ex) {
throw ex;
} finally {
this.toClose();
}
}
public byte[] chosenPictureInBytes(int id) throws Exception{
PreparedStatement pst;
ResultSet rs;
byte[] byteArr =new byte[1048576];
try{
this.connectDB();
pst = this.getConn().prepareStatement("SELECT personimage FROM person WHERE personid=? ");
pst.setInt(1,id);
rs = pst.executeQuery();
while(rs.next()){
// byteArr=rs.getBytes("personimage");
Blob blobPic = rs.getBlob("personimage");
byteArr=blobPic.getBytes(1,(int) blobPic.length());
}
}
catch(Exception ex){throw ex;}
finally{this.toClose();}
return byteArr;
}
PersonBeanApp.java：
@ManagedBean
@ApplicationScoped
public class PersonBeanApp {
public StreamedContent getImageDisplay() throws Exception{
PersonDAO dao;
try{
dao=new PersonDAO();
FacesContext fc=FacesContext.getCurrentInstance();
String id=fc.getExternalContext().getRequestParameterMap().get("image_id");
if(fc.getCurrentPhaseId()==PhaseId.RENDER_RESPONSE){ return new DefaultStreamedContent(); }
byte[] imageInByteArray=dao.chosenPictureInBytes(Integer.parseInt(id));
return new DefaultStreamedContent(new ByteArrayInputStream(imageInByteArray));
}
catch(Exception ex){throw ex;}
}
}
请帮帮我......
答案 0 :(得分：0)
在我的情况下，我必须在模态对话框中有一个img标签，我在用户点击对话框上的提交按钮时更新了@form。
<p:dialog widgetVar="dlg7" id="showImage" closable="true" modal="true" header="Edit Email Image" closeOnEscape="true" draggable="true" dynamic="true" >
<p:ajax event="close" listener="#{emailConfigurationEditAction.handleCloseEditImage}" update=":emailConfiguration" />
<h:form id="editImage">
<div id="editImageDiv" align="center">
<p:messages globalOnly="false" autoUpdate="true" id="messages"
rendered="true" closable="true">
<p:effect id="idar760" type="bounce" event="load" delay="500" />
</p:messages>
<h:panelGrid columns="2" width="500px;" id="editImageGrid" columnClasses="emailTemplatePadding,row1-padding">
<p:outputLabel value="#{msg.EMAIL_INLINE_IMAGE_NAME}" for="imageNameText" id="imageNameLable" />
<h:outputText value="#{emailConfigurationEditAction.editEmbeddedImage.cidname}" converter="upperCaseConverter" id="imageNameText" style="width:300px;" maxlength="20" validatorMessage="#{msg.EMAIL_INLINE_IMAGES_CIDNAME_VLDMSG}"/>
<p:outputLabel value="#{msg.EMAIL_INLINE_IMAGE_MIMETYPE}" for="imageMimeType" id="imagemimeLabel"/>
<p:selectOneMenu id="imageMimeType" value="#{emailConfigurationEditAction.editEmbeddedImage.mimeType}" style="width:310px">
<f:selectItem itemLabel="#{msg.DROP_SELECTONE }" itemValue="#{null}" />
<f:selectItems value="#{emailConfigurationEditAction.mimeTypeOptions}"/>
</p:selectOneMenu>
<p:outputLabel value="Uploaded Image:" id="imageUploadedLabel"/>
<img width="100" height="100" border="0" id="imageUploaded" src="data:image/jpg;base64,#{imageUtility.getImageAsString(emailConfigurationEditAction.editEmbeddedImage.imageByteArray)}" />
<!-- p:graphicImage value="#{emailImages.image}" id="imageUploaded" height="100px" width="100px" >
<f:param name="cidName" value="#{emailConfigurationEditAction.editEmbeddedImage.cidname}"/>
</p:graphicImage-->
<p:outputLabel value="#{msg.EMAIL_INLINE_IMAGE_UPLOAD}" for="imageUploader" id="imageUploaderLabel"/>
<p:fileUpload id="imageUploader" mode="advanced" dragDropSupport="true" fileLimit="1" update=":editImage" style="width:310px" label="#{msg.EMAIL_INLINE_UPLAOD_IMAGE}"
allowTypes="/(\.|\/)(gif|jpe?g|png)$/" fileUploadListener="#{emailConfigurationEditAction.imageEditListener}" fileLimitMessage="#{msg.EMAIL_INLINE_IMAGES_FILELIMIT_VLDMSG}"/>
</h:panelGrid>
<p:commandButton value="#{msg.BTN_SUBMIT}" id="submitNewImage" action="#{emailConfigurationEditAction.updateEmbeddedImage}" process=":editImage" ajax="true" update="@form"/>
<p:commandButton value="#{msg.BTN_CANCEL}" id="cancelEditImage" action="#{emailConfigurationEditAction.cancel}" immediate="true" ajax="true" process="@this"/>
</div>
</h:form>
</p:dialog>
我的数据表看起来如下：
<p:dataTable var="image" value="#{emailConfigurationEditAction.searchedImages}" id="dataTableImages" rendered="#{emailConfigurationEditAction.searchedImages!=null}"
paginator="true" rows="10" paginatorPosition="top"
rowStyleClass="#{index%2==0?'row1Data':'row2Data'}" style="width:600px;"
styleClass="ui-citi-datatable-paginator"
rowClasses="row1Data,row2Data"
paginatorTemplate="{FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}"
currentPageReportTemplate="{currentPage} #{msg.LBL_OF} {totalPages}"
emptyMessage="#{msg.INFO_SEARCH_RESULT_EMPTY}" >
<p:column id="col1" headerText="#{msg.EMAIL_INLINE_IMAGES_COLHDR_NAME}" styleClass="centered" style="width:175px;">
#{image.cidname}
</p:column>
<p:column id="col2" headerText="#{msg.EMAIL_INLINE_IMAGES_COLHDR_MIMETYPE}" styleClass="centered" style="width:120px;">
#{image.mimeType}
</p:column>
<p:column id="col3" headerText="#{msg.EMAIL_INLINE_IMAGES_COLHDR_IMAGE}" styleClass="centered" style="width:120px;">
<img width="100" height="100" border="0" id="graphicImage3"
src="data:image/jpg;base64,#{imageUtility.getImageAsString(image.imageByteArray)}" />
<!--p:graphicImage value="#{emailImages.image}" id="graphicImage3" height="100px" width="100px;">
<f:param name="cidName" value="#{image.cidname}"/>
</p:graphicImage-->
</p:column>
<p:column id="col4" headerText="" styleClass="centered" style="width:60px;">
<!-- h:commandButton image="/global/images/Delete_But_small.png" title="#{msg.LBL_EVENTEMAILMAPPING_DELETE_BUTTON}" immediate="true" value="#{msg.BTN_DELETE}" id="imgDelete"/>
<pe:tooltip for="imgDelete" value="#{msg.LBL_EVENTEMAILMAPPING_DELETE_BUTTON}" myPosition="left" atPosition="right"
showEffect="slideToggle" hideEffect="slideToggle" id="tooltip_delimg"/-->
<h:commandButton image="/global/images/Edit_But_small.png" title="#{msg.LBL_EVENTEMAILMAPPING_EDIT_BUTTON}" value="#{msg.BTN_EDIT}" id="imgEdit" action="#{emailConfigurationEditAction.editImage(image)}">
<p:ajax update=":editImage" oncomplete="PF('dlg7').show()" process="dataTableImages"/>
</h:commandButton>
<pe:tooltip for="imgEdit" value="#{msg.LBL_EVENTEMAILMAPPING_EDIT_BUTTON}" myPosition="left" atPosition="right"
showEffect="slideToggle" hideEffect="slideToggle" id="tooltip_edim"/>
</p:column>
</p:dataTable>
当我使用grpahicImage时，我明白它不会因为它的设计方式而起作用