fileuploadcontroller.java

springlive ch8

package org.appfuse.web;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.mail.MailException;
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.util.FileCopyUtils;
import org.springframework.validation.BindException;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class FileUploadController extends SimpleFormController {
    private static Log log = LogFactory.getLog(FileUploadController.class);
    private MailSender mailSender;
    private SimpleMailMessage message;

    public void setMailSender(MailSender mailSender) {
        this.mailSender = mailSender;
    }
    
    public void setMessage(SimpleMailMessage message) {
        this.message = message;
    }
    protected void initBinder(HttpServletRequest request,
                              ServletRequestDataBinder binder) 
    throws ServletException {
        binder.registerCustomEditor(byte[].class,
                                    new ByteArrayMultipartFileEditor());
    } 
    
    protected ModelAndView onSubmit(HttpServletRequest request,
                                    HttpServletResponse response, 
                                    Object command, BindException errors)
    throws ServletException, IOException {
    
        FileUpload bean = (FileUpload) command;
        byte[] bytes = bean.getFile();
        
        // cast to multipart file so we can get additional information
        MultipartHttpServletRequest multipartRequest = 
            (MultipartHttpServletRequest) request;
        CommonsMultipartFile file = 
            (CommonsMultipartFile) multipartRequest.getFile("file");
        
        String uploadDir = getServletContext().getRealPath("/upload/");

        // Create the directory if it doesn't exist
        File dirPath = new File(uploadDir);
        
        if (!dirPath.exists()) {
            dirPath.mkdirs();
        }
        
        String sep = System.getProperty("file.separator");
        if (log.isDebugEnabled()) {
        	log.debug("uploading to: " + uploadDir + sep + 
                      file.getOriginalFilename());
        }
        
        String filename = file.getOriginalFilename();
        if (filename.endsWith(".html")) {
        	filename = filename.replaceAll(".html", ".htm");
        }
        File uploadedFile = new File(uploadDir + sep + filename);
        FileCopyUtils.copy(bytes, uploadedFile);
        
        // set success message
        request.getSession().setAttribute("message", "Upload completed."); 
                
        String url = request.getContextPath() + "/upload/" + 
                     filename;
        
        Map model = new HashMap();
        model.put("filename", file.getOriginalFilename());
        model.put("url", url);
        
        // Notify user that file has finished uploading
        SimpleMailMessage msg = new SimpleMailMessage(this.message);
        msg.setTo("[e-mail]");
        msg.setText("File \"" + file.getOriginalFilename() +
                    "\" has finished uploading.");
        try {
            mailSender.send(msg);
        } catch (MailException ex) {
            log.error(ex.getMessage());
        }
        
        return new ModelAndView(getSuccessView(), "model", model);
    }
}