Jqm file upload, Image Upload, jqm form operations, jqm ajax usage, jqm File Operations Daquan, file operation demo

I recently saw various problems in uploading images or files using html5 in the Forum. I have never done this before. Today I have made some time to study it. Now the example is OK. I will share it with you, hoping to help you.
Well, let's first look at the effect:

Let's see the Page code:

<! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> Let's take a look at the simple servlet code:


Package com. herman. jqm. servlet; import java. io. file; import java. io. fileOutputStream; import java. io. IOException; import java. io. inputStream; import java. io. outputStream; import java. util. list; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import org. apache. commons. fileupload. fileItem; I Mport org. apache. commons. fileupload. disk. diskFileItemFactory; import org. apache. commons. fileupload. servlet. servletFileUpload;/*** @ see: upload an image or file FileServlet * @ author Administrator * @ date 10:00:39 on January 1, June 23, 2014 */public class FileServlet extends HttpServlet {private static final long serialVersionUID = 1L; /*** default constructor */public FileServlet () {}/ *** @ see HttpServlet # doGet (HttpServletRequest request, H Response) */protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {}/*** @ see HttpServlet # doPost (HttpServletRequest request, HttpServletResponse response) * // @ SuppressWarnings ("unchecked") protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request. setCh AracterEncoding ("UTF-8"); // sets the encoding // gets the disk file entry factory DiskFileItemFactory factory = new DiskFileItemFactory (); // obtain the path to which the file is to be uploaded. String path = getServletContext (). getRealPath ("/"); // if the following two rows are not set, uploading large files will occupy a lot of memory. // you can set a temporary storage room, it may be different from the directory of the final stored file. * ** the principle is that it is first saved to the temporary storage room and then written to the hard disk of the corresponding directory. * When uploading a file, actually, two copies are uploaded, and the first one is. * In tem format, and then write it to the hard disk of the corresponding directory */factory. setRepository (new File (path); // sets the cache size. When the size of the uploaded File exceeds the cache Put it in the temporary storage room factory. setSizeThreshold (1024*1024); // high-level API File upload processing ServletFileUpload upload = new ServletFileUpload (factory ); try {// you can upload multiple file lists <FileItem> List = (list <FileItem>) upload. parseRequest (request); for (FileItem item: list) {// obtain the attribute name of the Form. String name = item. getFieldName (); // if the obtained form information is normal text information if (item. isFormField () {// obtain the String entered by the user. The name is very good because the String value = item is submitted in the form. getString (); request. se TAttribute (name, value);} else {// process input non-simple strings, such as binary images and movies. *** the following three steps, obtain the name of the uploaded file * // obtain the path String value = item. getName (); // index to the last backslash int start = value. lastIndexOf ("\"); // intercept the name of the uploaded file. Add 1 to remove the backslash, String filename = value. substring (start + 1); request. setAttribute (name, filename); // OutputStream out = new FileOutputStream (new File (path, filename) Written manually to the disk; InputStream in = item. getInputStream (); Int length = 0; byte [] buf = new byte [1024]; // in. read (buf) the data read each time is stored in the buf array while (length = in. read (buf ))! =-1) {// extract data from the buf array and write it to the (output stream) disk out. write (buf, 0, length);} in. close (); out. flush (); out. close () ;}} catch (Exception e) {e. printStackTrace ();} request. getRequestDispatcher ("/OK .html "). forward (request, response );}}
It's easy. Well, it's here. You are also welcome to pay more attention to my blog!

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Resource demo download path: http://download.csdn.net/download/xmt1139057136/7538193

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