我只是复制了 primefaces 展示上的示例，但没有显示选择图像的区域。在陈列柜中，它看起来很简单。
我的页面：
<ui:composition
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:form>
<p:imageCropper value="#{uploadMB.croppedImage}" id="imageCropper"
image="/images/banner.jpg" />
</h:form>
</ui:composition>
我的BackBean：
@ManagedBean
public class UploadMB implements Serializable{
private static final Logger logger = Logger.getLogger(UploadMB.class.getName());
private CroppedImage croppedImage;
private String newImageName;
public String crop() {
if(croppedImage == null)
return null;
setNewImageName(getRandomImageName());
ServletContext servletContext = (ServletContext) FacesContext.getCurrentInstance().getExternalContext().getContext();
String newFileName = servletContext.getRealPath("") + File.separator + "images" + File.separator + "barca" + File.separator + getNewImageName() + ".jpg";
FileImageOutputStream imageOutput;
try {
imageOutput = new FileImageOutputStream(new File(newFileName));
imageOutput.write(croppedImage.getBytes(), 0, croppedImage.getBytes().length);
imageOutput.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private String getRandomImageName() {
int i = (int) (Math.random() * 100000);
return String.valueOf(i);
}
public String getNewImageName() {
return newImageName;
}
public CroppedImage getCroppedImage() {
return croppedImage;
}
public void setCroppedImage(CroppedImage croppedImage) {
this.croppedImage = croppedImage;
}
public void setNewImageName(String newImageName) {
this.newImageName = newImageName;
}
是否有可能缺少一些库？或其他配置选项？我刚刚下载了 primefaces 3.5 jar 并将其放入我的类路径中。
谢谢