使用GWT Jersey Rest显示存储为blob的图像

Question

我无法显示存储为休息服务返回的blob的图像：

这是返回编码到base64中的blob存储图像的其余服务代码：

@GET
@Path("/get")
@Produces("image/jpeg")
public Response getFile() {
    String base64 = getStringImage();
    ResponseBuilder response = Response.ok((Object) base64);
    return response.build();
}

String getStringImage() {
    try {
        AnounceService anounceService =                          (AnounceService)getApplicationContext().getBean("AnounceService");
        Blob imageBlob =  anounceService.getStgImage();
        int blobLength = (int)imageBlob.length();
        byte[] buff = imageBlob.getBytes(1, blobLength);
        String base64=Base64Utils.toBase64(buff);
        return base64;
    } catch (Exception exc) {

    }
    return null;
}

这是gwt客户端代码，无法显示上述其余代码返回的图像： String url =＆＃34; root / api / image / get＆＃34 ;; 最终RequestBuilder builder = new RequestBuilder（RequestBuilder.GET，url）; Image img;

builder.setCallback（new RequestCallback（）{

            public void onResponseReceived(final Request request, final Response response) {
                    if (response.getStatusCode() == Response.SC_OK) {
                        final HTML imageHolder = new HTML();
                        String base64 = response.getText();
                        String imgTag = "<img src='data:image/gif;base64,"+base64+"' />'";
                        imageHolder.setHTML(imgTag);

                        RootPanel.get().add(imageHolder);

                    }

                }

没有触发任何错误，但我没有看到浏览器中显示的任何图片。