使用GWT保存上载的文件

我正在使用

org.apache.commons.fileupload

上传

public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {

     boolean isMultipart = ServletFileUpload.isMultipartContent(request);
     GWT.log("is multipart? " + Boolean.toString(isMultipart), null);

     ServletFileUpload upload = new ServletFileUpload();

     try{
            FileItemIterator iter = upload.getItemIterator(request);

            while (iter.hasNext()) {
                    FileItemStream item = iter.next();
                    String name = item.getFieldName();
                    InputStream stream = item.openStream() ;

                    /**
                    * Save th uploaded file
                    */

            }
     }
    catch(Exception e){
            e.printStackTrace();
    }
 }

---

如何保存上传的文件？

这看起来像是服务器端代码，它（除了GWT-RPC servlet）根本不是GWT特有的。那

GWT.log（）

是不必要的——用常规日志调用替换它，并像在非GWT代码中一样处理上载，因为这就是它

---

.

这看起来像是服务器端代码，它（除了GWT-RPC servlet）根本不是GWT特有的。那

GWT.log（）

是不必要的——用常规日志调用替换它，并像在非GWT代码中一样处理上载，因为这就是它

---

.

我想这对你有帮助

if (!item.isFormField()) {
    String fieldName = item.getFieldName();
    String fileName = item.getName();
    String contentType = item.getContentType();
    boolean isInMemory = item.isInMemory();
    long sizeInBytes = item.getSize();

  File saveTo = new File("/file_uploads/" + fileName);
  try {
    item.write(saveTo);
    ...
  }
  catch (Exception e){
    ...
  }

请记住，上传的文件可能已经由org.apache.commons.fileupload自动保存

您可以使用设置要保存在磁盘上或加载到内存中的文件的大小阈值

// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
factory.setSizeThreshold(yourMaxMemorySize);
factory.setRepository(yourTempDirectory);

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// Set overall request size constraint
upload.setSizeMax(yourMaxRequestSize);

// Parse the request
List /* FileItem */ items = upload.parseRequest(request);

---

关于org.apache.commons.fileupload，您需要了解的所有信息都在这里：

我认为这可以帮助您

if (!item.isFormField()) {
    String fieldName = item.getFieldName();
    String fileName = item.getName();
    String contentType = item.getContentType();
    boolean isInMemory = item.isInMemory();
    long sizeInBytes = item.getSize();

  File saveTo = new File("/file_uploads/" + fileName);
  try {
    item.write(saveTo);
    ...
  }
  catch (Exception e){
    ...
  }

请记住，上传的文件可能已经由org.apache.commons.fileupload自动保存

您可以使用设置要保存在磁盘上或加载到内存中的文件的大小阈值

// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();

// Set factory constraints
factory.setSizeThreshold(yourMaxMemorySize);
factory.setRepository(yourTempDirectory);

// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);

// Set overall request size constraint
upload.setSizeMax(yourMaxRequestSize);

// Parse the request
List /* FileItem */ items = upload.parseRequest(request);

关于org.apache.commons.fileupload，您需要了解的所有信息如下：