a4j:mediaOutput not working

Question

我使用JBoss网站上的示例来上传图像并显示它们。上传工作正常，但在a4j:mediaOutput中显示图像不起作用。有人能告诉我问题出在哪里吗？谢谢

我的视图代码：

<h:body>
<h:form>
    <h:panelGrid border="1" columns="2"  columnClasses="top,top">
        <rich:fileUpload fileUploadListener="#{fileUploadBean.uploadsAvailable}" id="upload"
            immediateUpload="#{fileUploadBean.autoUpload}"
            acceptedTypes="jpg, gif, png, bmp"
            allowFlash="#{fileUploadBean.useFlash}">
            <a4j:ajax render="info" event="uploadcomplete" />
        </rich:fileUpload>
        <h:panelGroup id="info">
            <rich:panel bodyClass="info">
                <f:facet name="header">
                    <h:outputText value="Uploaded Files Info" />
                </f:facet>
                <h:outputText value="No files currently uploaded"
                    rendered="#{fileUploadBean.size==0}" />
                <rich:dataGrid columns="1" value="#{fileUploadBean.files}"
                    var="file" rowKeyVar="row">
                    <rich:panel bodyClass="rich-laguna-panel-no-header">
                        <h:panelGrid columns="2">
                            <a4j:mediaOutput element="img" mimeType="#{file.mime}"
                                createContent="#{fileUploadBean.paint}" value="#{row}"
                                style="width:100px; height:100px;" cacheable="false">
                                <f:param value="#{fileUploadBean.timeStamp}" name="time" />
                            </a4j:mediaOutput>
                            <h:panelGrid columns="2">
                                <h:outputText value="File Name:" />
                                <h:outputText value="#{file.name}" />
                                <h:outputText value="File Length(bytes):" />
                                <h:outputText value="#{file.length}" />
                            </h:panelGrid>
                        </h:panelGrid>
                    </rich:panel>
                </rich:dataGrid>
            </rich:panel>               
            <br />
            <a4j:commandButton action="#{fileUploadBean.clearUploadData}"
                reRender="info, upload" value="Clear Uploaded Data"
                rendered="#{fileUploadBean.size>0}" />  
        </h:panelGroup>     
    </h:panelGrid>
</h:form>

Bean

public class FileUploadBean implements Serializable {
private static final long serialVersionUID = 1L;
private ArrayList<File> files = new ArrayList<File>();
private int uploadsAvailable = 5;
private boolean autoUpload = false;
private boolean useFlash = false;
private int size;

public int getSize() {
    if (getFiles().size() > 0) {
        return getFiles().size();
    } else {
        return 0;
    }
}
public FileUploadBean() {
}
public void paint(OutputStream stream, Object object) throws IOException {
    stream.write(getFiles().get((Integer) object).getData());
    stream.close();
}
public void listener(FileUploadEvent event) throws Exception {
    UploadedFile item = event.getUploadedFile();
    File file = new File();
    file.setLength(item.getData().length);
    file.setName(item.getName());
    file.setData(item.getData());
    files.add(file);
    uploadsAvailable--;
}
public String clearUploadData() {
    files.clear();
    setUploadsAvailable(5);
    return null;
}
public long getTimeStamp() {
    return System.currentTimeMillis();
}
public ArrayList<File> getFiles() {
    return files;
}
public void setFiles(ArrayList<File> files) {
    this.files = files;
}
public int getUploadsAvailable() {
    return uploadsAvailable;
}
public void setUploadsAvailable(int uploadsAvailable) {
    this.uploadsAvailable = uploadsAvailable;
}
public boolean isAutoUpload() {
    return autoUpload;
}
public void setAutoUpload(boolean autoUpload) {
    this.autoUpload = autoUpload;
}
public boolean isUseFlash() {
    return useFlash;
}
public void setUseFlash(boolean useFlash) {
    this.useFlash = useFlash;
}
}

和文件类：

public class File {
private String Name;
private String mime;
private long length;
private byte[] data;
public byte[] getData() {
    return data;
}
public void setData(byte[] data) {
    this.data = data;
}
public String getName() {
    return Name;
}
public void setName(String name) {
    Name = name;
    int extDot = name.lastIndexOf('.');
    if (extDot > 0) {
        String extension = name.substring(extDot + 1);
        if ("bmp".equals(extension)) {
            mime = "image/bmp";
        } else if ("jpg".equals(extension)) {
            mime = "image/jpeg";
        } else if ("gif".equals(extension)) {
            mime = "image/gif";
        } else if ("png".equals(extension)) {
            mime = "image/png";
        } else {
            mime = "image/unknown";
        }
    }
}
public long getLength() {
    return length;
}
public void setLength(long length) {
    this.length = length;
}
public String getMime() {
    return mime;
}
}

Answer 1

<rich:fileUpload fileUploadListener="#{fileUploadBean.uploadsAvailable}"

侦听器被设置为错误的方法。(如果你从RichFaces 3切换到4，你可以只使用当前代码，而不是尝试自己移植它。(