Process image and processing file with description Information upload 4 (62), file upload 62

Process image and processing file with description Information upload 4 (62), file upload 62

I. process the upload of images and processed files with instructions

void		delete() Delete the files stored in the temporary directory.
String		GetContentType() Obtain the document type Returns the content type passed by the browser or null if not defined.
String		GetFieldName() Obtain the field name, that is, name = xxxx Returns the name of the field in the multipart form corresponding to this file item. <Input type = "file" name ="Img"/>
InputStream		GetInputStream() Returns an InputStream that can be used to retrieve the contents of the file.
String		GetName() ReturnsOriginalFilename in the client's filesystem, as provided by the browser (or other client software ). Obtain the file name. If the file obtained in IE is c: \ aaa \ xxx.jpg-the complete path. Non-IE; the file name is only xxx.jpg
Long		GetSize() Get the file size equivalent to in. avilivable (); Returns the size of the file item
If you upload a common text element, you can obtain the data in the element in the following ways: <Form enctype = "multipart/form-data"> <Input type = "text" name = "name"/>
String		GetString() Is used to obtain information about common form fields. Returns the contents of the file item as a String, using the default character encoding. (IOS-8859-1)
String		GetString(String encoding) the encoding format can be specified. Returns the contents of the file item as a String, using the specified encoding.
Void		Write(File file) directly save the File to another file. A convenience method to write an uploaded item to disk.
The following files determine whether a fileItem is a file (type = file) object or a text (type = text | checkbox | radio) object:
boolean	isFormField()If it is text | checkbox | radio | select, the value is true. Determines whether or notFileItemInstance represents a simple form field.

Code:

Public ClassUpDescServletExtendsHttpServlet {

Public VoidDoPost (HttpServletRequest request, HttpServletResponse response)

ThrowsServletException, IOException {

Request. setCharacterEncoding ("UTF-8"); // get Chinese file names

String path = getServletContext (). getRealPath ("/up ");

DiskFileItemFactory disk =

NewDiskFileItemFactory ();

Disk. setRepository (NewFile ("d:/"));

Try{

ServletFileUpload up =

NewServletFileUpload (disk );

List <FileItem> list = up. parseRequest (request );

For(FileItem file: list ){

// Step 1: determine whether it is a normal form item

If(File. isFormField ()){

String fileName = file. getFieldName (); // <input type = "text" name = "desc"> = desc

String value = file. getString ("UTF-8"); // data is read in ISO by default

System.Err. Println (fileName + "=" + value );

}Else{// Indicates a file

String fileName = file. getName ();

FileName = fileName. substring (fileName. lastIndexOf ("\") + 1 );

File. write (NewFile (path + "/" + fileName ));

System.Err. Println ("file name:" + fileName );

System.Err. Println ("file size:" + file. getSize ());

File. delete ();

}

}

}Catch(Exception e ){

E. printStackTrace ();

}

}

}

2. Process File Upload (Performance Improvement)

 

Use FileItemIterator it = up. getItemIterator (request) to process file uploads.

PackageCn. hx. servlet;

ImportJava. io. File;

ImportJava. io. IOException;

ImportJava. io. InputStream;

ImportJava. io. PrintWriter;

ImportJava. util. List;

ImportJavax. servlet. ServletException;

ImportJavax. servlet. http. HttpServlet;

ImportJavax. servlet. http. HttpServletRequest;

ImportJavax. servlet. http. HttpServletResponse;

ImportOrg. apache. commons. fileupload. FileItem;

ImportOrg. apache. commons. fileupload. FileItemIterator;

ImportOrg. apache. commons. fileupload. FileItemStream;

ImportOrg. apache. commons. fileupload. RequestContext;

ImportOrg. apache. commons. fileupload. disk. DiskFileItemFactory;

ImportOrg. apache. commons. fileupload. servlet. ServletFileUpload;

ImportOrg. apache. commons. fileupload. servlet. ServletRequestContext;

ImportOrg. apache. commons. io. FileUtils;

Public ClassFastServletExtendsHttpServlet {

Public VoidDoPost (HttpServletRequest request, HttpServletResponse response)

ThrowsServletException, IOException {

Request. setCharacterEncoding ("UTF-8 ");

String path = getServletContext (). getRealPath ("/up ");

DiskFileItemFactory disk =

NewDiskFileItemFactory ();

Disk. setRepository (NewFile ("d:/"));

Try{

ServletFileUpload up =NewServletFileUpload (disk );

// The following is the iterator Mode

FileItemIterator it = up. getItemIterator (request );

While(It. hasNext ()){

FileItemStream item = it. next ();

String fileName = item. getName ();

FileName = fileName. substring (fileName. lastIndexOf ("\") + 1 );

InputStream in = item. openStream ();

FileUtils.CopyInputStreamToFile(In,NewFile (path + "/" + fileName ));

}

}Catch(Exception e ){

E. printStackTrace ();

}

}

}