此代码似乎可以正常工作，但是当我使用它从数据库呈现图像时，页面上的图像不完整。仅渲染了图像的前 70%。用不同的图像渲染不同数量的图像。
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
FileData fileData = new FileData();
int id = Integer.parseInt(request.getParameter("id"));
UploadFile uploadFile = fileData.SelectFile(id);
inputStream = uploadFile.data;
fileName = uploadFile.name;
if(uploadFile.Type.equals("Image/Video"))
{
contentType = "image";
}
render(request, response);
}
private void render(ServletRequest request, ServletResponse response) throws IOException {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int inputStreamLength = 0;
int length = 0;
while ((length = inputStream.read(buffer)) > -1) {
inputStreamLength += length;
baos.write(buffer, 0, length);
}
if (inputStreamLength > contentLength) {
contentLength = inputStreamLength;
}
if (response instanceof HttpServletResponse) {
HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.reset();
httpResponse.setHeader("Content-Type", contentType);
httpResponse.setHeader("Content-Length", String.valueOf(contentLength));
httpResponse.setHeader("Content-Disposition", "\"" + contentDisposition +
"\"" + (fileName != null && !fileName.isEmpty()) !=
null ? "; filename=\"" + fileName + "\"": "");
}
response.getOutputStream().write(baos.toByteArray(), 0, (int)contentLength);
//finally
response.getOutputStream().flush();
//clear
baos = null;
}
finally {
close(response.getOutputStream());
close(inputStream);
}
}
private void close(Closeable resource) throws IOException {
if (resource != null) {
resource.close();
}
}
这是图像在 Firefox 页面上的外观示例。
我检查了图像在上传到网站时没有损坏，并且图像在数据库中很好。问题是在网站上呈现图像的代码。
我究竟做错了什么？