Gwt SampleUploadServlet,如何将文件保存到服务器(JAVA,Gwt)中的文件夹中?
我从互联网上复制了这段代码(允许用户将图像从客户端上传到服务器) 但它并没有给出将文件保存到服务器文件夹中的实际代码Gwt SampleUploadServlet,如何将文件保存到服务器(JAVA,Gwt)中的文件夹中?,java,gwt,Java,Gwt,我从互联网上复制了这段代码(允许用户将图像从客户端上传到服务器) 但它并没有给出将文件保存到服务器文件夹中的实际代码 package my.server; public class SampleUploadServlet extends UploadAction{ private static final long serialVersionUID = 1L; Hashtable<String, String> receivedContentTypes = new Has
package my.server;
public class SampleUploadServlet extends UploadAction{
private static final long serialVersionUID = 1L;
Hashtable<String, String> receivedContentTypes = new Hashtable<String, String>();
/**
* Maintain a list with received files and their content types.
*/
Hashtable<String, File> receivedFiles = new Hashtable<String, File>();
/**
* Override executeAction to save the received files in a custom place
* and delete this items from session.
*/
@Override
public String executeAction(HttpServletRequest request, List<FileItem> sessionFiles) throws UploadActionException {
String response = "";
int cont = 0;
for (FileItem item : sessionFiles) {
if (false == item.isFormField()) {
cont ++;
try {
/// Create a new file based on the remote file name in the client
// String saveName = item.getName().replaceAll("[\\\\/><\\|\\s\"'{}()\\[\\]]+", "_");
// File file =new File("/tmp/" + saveName);
/// Create a temporary file placed in /tmp (only works in unix)
// File file = File.createTempFile("upload-", ".bin", new File("/tmp"));
/// Create a temporary file placed in the default system temp folder
File file = File.createTempFile("upload-", ".bin");
item.write(file);
/// Save a list with the received files
receivedFiles.put(item.getFieldName(), file);
receivedContentTypes.put(item.getFieldName(), item.getContentType());
//Window.alert(file.getAbsolutePath()+" oook");
//String s=file.getAbsolutePath()+" oook";
/// Send a customized message to the client.
response += "File saved as " + file.getAbsolutePath();
//FileWriter fstream = new FileWriter(file.getAbsolutePath()+"//folder//out.txt",true);
//SEEM WE NEED TO DO SOMETHING HERE TO SAVE A FILE INTO THE FOLDER.
} catch (Exception e) {
throw new UploadActionException(e);
}
}
}
// System.out.println(response);
/// Remove files from session because we have a copy of them
removeSessionFileItems(request);
/// Send your customized message to the client.
return response;
}
/**
* Get the content of an uploaded file.
*/
@Override
public void getUploadedFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
String fieldName = request.getParameter(UConsts.PARAM_SHOW);
File f = receivedFiles.get(fieldName);
if (f != null) {
response.setContentType(receivedContentTypes.get(fieldName));
FileInputStream is = new FileInputStream(f);
copyFromInputStreamToOutputStream(is, response.getOutputStream());
} else {
renderXmlResponse(request, response, XML_ERROR_ITEM_NOT_FOUND);
}
}
/**
* Remove a file when the user sends a delete request.
*/
@Override
public void removeItem(HttpServletRequest request, String fieldName) throws UploadActionException {
File file = receivedFiles.get(fieldName);
receivedFiles.remove(fieldName);
receivedContentTypes.remove(fieldName);
if (file != null) {
file.delete();
}
}
}
打包my.server;
公共类SampleUploadServlet扩展了UploadAction{
私有静态最终长serialVersionUID=1L;
Hashtable receivedContentTypes=新Hashtable();
/**
*维护包含已接收文件及其内容类型的列表。
*/
Hashtable receivedFiles=新Hashtable();
/**
*重写executeAction以将收到的文件保存在自定义位置
*并从会话中删除此项目。
*/
@凌驾
公共字符串执行操作(HttpServletRequest请求,列表会话文件)引发UploadActionException{
字符串响应=”;
int cont=0;
对于(文件项:会话文件){
if(false==item.isFormField()){
cont++;
试一试{
///基于客户端中的远程文件名创建新文件
//String saveName=item.getName().replaceAll(“[\\\\/>这不是我的解决方案。已经有人回答了
您应该使用文件#createTempFile(),该文件采用一个目录
File file = File.createTempFile("upload-", ".bin", new File("/path/to/your/uploads"));
item.write(file);
或者,如果以后确实要将临时文件移动到另一个位置,请使用file#rename to()
绝对一旦你收到文件rest是simple core java没有什么特别的。我尝试了很多方法,但都无法保存文件。我的客户端没有调用SampleUploadServlet,你知道如何让客户端调用SampleUploadServlet吗?在客户端,它工作正常&实际上它将图像放入客户端会话中。它说系统找不到路径吗阅读注释///在/tmp中创建一个临时文件(仅在unix中可用),并将其存储为.bin bot,即映像的实际ext
File destination = new File("/path/to/your/uploads", file.getName());
file.renameTo(destination);