相关疑难解决方法(0)

我想显示的保存在数据库中的图像字节StreamedContent中<p:graphicImage>,如下所示:

<p:graphicImage  value="#{item.imageF}" width="50"  id="grpImage" height="80"/>

private StreamedContent content; // getter and setter

public StreamedContent getImageF() {

    if (student.getImage() != null) {
        InputStream is = new ByteArrayInputStream(student.getImage());
        System.out.println("Byte :"+student.getImage());
        content = new DefaultStreamedContent(is, "", student.getStuID());
        System.out.println("ddd ------------------------------- " + content);
        return content;
    }

    return content;
}

这将返回一个空白图像.这是怎么造成的,我该如何解决？

标准输出打印以下内容:

INFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@b0887b
INFO: Byte :[B@a2fb48
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@1d06a92
INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@39a60
INFO: Byte :[B@d52f0b
INFO: ddd ------------------------------- org.primefaces.model.DefaultStreamedContent@8c3daa …

我在JBoss 7.1.1上使用PrimeFaces 3.2.

我试图在MySQL数据库中显示存储在BLOB中的图像<ui:repeat>.图像存储在a中byte[],然后转换StreamedContent为如下:

InputStream stream = new ByteArrayInputStream(ingredient.getImage());
ingredient.setJsfImage(new DefaultStreamedContent(stream, "image/jpg"));

然后我试图在Facelet中显示它如下:

<ui:repeat var="ingredient" value="#{formBean.ingredientResultSet}">
    <p:panel id="resultsPanel" header="#{ingredient.location.shopName}">
        <p:graphicImage value="#{ingredient.jsfImage}" alt="No picture set" />
...

但是,在加载页面时,我在JBoss中收到以下错误:

SEVERE [org.primefaces.application.PrimeResourceHandler](http - 127.0.0.1-8080-12)流式动态资源出错.

这是怎么造成的,我该如何解决？

我想使用PrimeFaces数据表从数据库动态加载图像.代码如下所示,基于此PF论坛主题:

<p:dataTable id="tablaInventario" var="inv" value="#{registrarPedidoController.inventarioList}" paginator="true" rows="10"
    selection="#{registrarPedidoController.inventarioSelected}" selectionMode="single"                                     
    update="tablaInventario tablaDetalle total totalDesc" dblClickSelect="false" paginatorPosition="bottom">
    <p:column sortBy="producto.codigo" filterBy="producto.codigo">
        <f:facet name="header">#{msg.codigo}</f:facet>
        #{inv.producto.codProducto}
    </p:column>                            
    <p:column>
        <f:facet name="header">Foto</f:facet>
        <p:graphicImage id="photo" value="#{registrarPedidoController.streamedImageById}" cache="FALSE">
            <f:param name="inv" value="#{inv.id}" />
        </p:graphicImage>                                
    </p:column>
</p:dataTable>

同

public StreamedContent getStreamedImageById() {
    DefaultStreamedContent image = null;
    String get = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("inv");
    System.out.println("[Param]: " + get); // This prints null.
    Long id = new Long(get);
    List<Inventario> listInventarios = controladorRegistrarPedido.listInventarios();

    for (Inventario i : listInventarios) {
        if (i.getId().compareTo(id) == 0) {
            byte[] …

我试图显示一个面板,用户可以看到项目列表类别(显示为图像),点击后可以查看该类别中的产品(图像将显示)

为了显示项目类别,我使用了ui:重复nad支持bean calss下面是我的xhtml代码

<ui:repeat id="repeat" value="#{getData.images}" var="img" varStatus="loop">
<h:panelGroup>
<p:graphicImage id="img1" value="#{img}" alt="image not available" >
</p:graphicImage>
</h:panelGroup>
</ui:repeat>

和Managed Bean Code部分

private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private List<StreamedContent> imageList = new ArrayList<StreamedContent>();

public List<StreamedContent> getImages(){
  for (int i = 0; i < sdh.getNumOfImages(); i++) {
    imageID = imageIDArray.get(i);
    ImageService imgSer = new ImageService();
    imgList.add(imageID);
    imgSer.setData(imageID);
    baos = imgSer.getImage();
    try {
      imageList.add(new DefaultStreamedContent(new 
            ByteArrayInputStream(baos.toByteArray())));
    } catch (Exception ex) {
        ex.printStackTrace();
    }
  }
  imageNum = 0;
  return imageList;
}

public …

我在eclipse下收到以下警告:

WARNING: JSF1091: No mime type could be found for file dynamiccontent. To resolve this, add a mime-type mapping to the applications web.xml

发布图片时会导致此错误

在primefaces composant下面:

<p:graphicImage  value="#{bean.image}"/>

Java Bean:

private StreamedContent image;

// Getter
public StreamedContent getImage() {
    try {
        JFreeChart jfreechart = ChartFactory.createPieChart3D("",
                        createDataset(), true, true, false);

        PiePlot3D plot = (PiePlot3D) jfreechart.getPlot();

        File chartFile = new File("dynamichart");
        ChartUtilities.saveChartAsPNG(chartFile, jfreechart, 375, 300);
        chartImage = new DefaultStreamedContent(new FileInputStream(
                        chartFile), "image/png");
        return chartImage;
    } catch (Exception e) {
        e.printStackTrace();
        return new …