form file upload form, servlet file reception

1. The need to import jar package

• commons-fileupload-1.3.2.jar
• commons-io-2.5.jar

2.index.html 

<! DOCTYPE HTML > 
< HTML > 
< head > 
< Meta charset = "UTF-. 8" > 
< title > the Insert title here Wallpaper </ title > 
</ head > 
< body > 
        <-! To utilize DiskFileItemFactory Upload Files in jsp or html page, form a form method must be set to post, and to set = the enctype "multipart / form-Data":   -> 
        < form Action = "the FileServlet" method = "POST" the enctype = "multipart / form- the Data " >
        Name: < the INPUT of the type="text" name="uname">
        密码：<input type="password" name="pwd">
        文件：<input type="file" name="myfile">
        
        <input type="submit" value="提交">
    </form>
    
</body>
</html>

3.FileServlet.java servlet receives the file code

package web;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
importorg.apache.commons.fileupload.servlet.ServletFileUpload;
 / * 
 * @WebServlet marked for annotation on a inherited HttpServlet class, belonging to the class level annotation 
 * where / FileServlet url indicates access the servlet mapping (address) ( here a relative path, i.e., "item name / the FileServlet") 
 * the role equivalent to the annotation servlet configuration in web.xml <servlet-mapping> element <url-pattern> configuration 
 * * / 
@ WebServlet ( "/ the FileServlet" )
 public  class the FileServlet the extends HttpServlet { // extend HttpServlet class
     // serialVersionUID role is to maintain compatibility version, i.e. deserialize objects remain in the version upgrade serialization uniqueness, the version control 
    Private  static  Final  Long serialVersionUID = 1L ; 
       
    // processing method GET method request 
    protected void the doGet (the HttpServletRequest Request, the HttpServletResponse Response) throws ServletException, IOException {
         // create a parser facility 
        DiskFileItemFactory Factory = new new DiskFileItemFactory ();
         // file upload parser 
        ServletFileUpload = Upload new new ServletFileUpload (Factory);
         // determines whether the attribute enctype is a multipart / form-Data 
        Boolean isMultipart = ServletFileUpload.isMultipartContent (request);
         IF (isMultipart) {
             the try {
                 // parse the request, the entry form for each object is encapsulated into a FileItem
                List <the FileItem> fileItems = upload.parseRequest (Request);
                 // iteration form data 
                for (the FileItem FileItem: fileItems) {
                     // determine the type of input ordinary file entry or 
                    IF (fileItem.isFormField ()) {
                         // Normal entry, obtain the value of the name attribute of the input, fileItem.getFieldName () 
                        //// obtained values of the input items, fileItem.getString ( "UTF-8" ), "UTF-8" Chinese prevent distortion 
                        System.out .println (fileItem.getFieldName () + "\ T" + fileItem.getString ( "UTF-. 8" )); 
                    } the else {
                         // upload a file, get file upload the file name field
                         //Note IE or FireFox acquired file name is not the same, IE is an absolute path, FireFox only the file name 
                        String fileName = fileItem.getName (); 
                        System.out.println (fileName); 
                        // the Substring string is taken , the return value is a string taken after
                         // string after lastIndexOf ( ".") from right to left to check, obtaining 
                        string EXT = fileName.substring (fileName.lastIndexOf ( "." ));
                         // . UUID.randomUUID () toString () is a method of automatically generating a primary key javaJDK provided only drawback is that the results generated UUID string will be longer 
                        String name = UUID.randomUUID () + EXT;
                         // save the object FileItem the main content saved to a file specified by 
                        file file = new new File("E:\\火影忍者\\"+name);
                    
                        fileItem.write(file);
                    }
                }
            } catch (FileUploadException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            
        }else{
            System.out.println("普通表单");
        }
        
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}