Develop Spring MVC Apps with JBuilder2005 - Multipart (FileUpload)

Develop Spring MVC Apps with JBuilder2005 - Multipart (FileUpload)

Gaoke Hua

About the author: Gao Jinghua, Nanjing Aviation College computing a master's degree in mathematics, more than ten years of corporate informationization work experience. Current research interest, J2EE enterprise application, ERP software research and development, data warehouse system research and development.

1. Establish basic Spring applications according to "Developing Spring MVC Applications with JBuilder2005"

2. Add a Commons-FileUpload.jar class library

3. Add two class files

/ src / fileupload / fileuploadController.java

Package fileupload;

Import java.io. *;

Import javax.servlet. *;

Import javax.servlet.http. *;

Import org.springframework.validation. *;

Import org.springframework.Web.bind. *;

Import org.springframework.web.multipart.support. *;

Import org.springframework.web.servlet. *;

Import org.springframework.Web.Servlet.mvc. *;

// snippet from FileUploadController

Public Class FileUploadController Extends SimpleFormController {

Protected ModlandView OnSubmit

HTTPSERVLETREQUEST REQUEST,

HTTPSERVLETRESPONSE RESPONSE,

Object Command,

Bindexception error) throws servletexception, ioException {

// Cast the bean

FileUploadBean bean = (fileuploadbean) Command;

// let's see if there's content there

Byte [] file = bean.getfile ();

IF (file.length == 0) {

// HMM, That's Strange, The User Did Not Upload Anything

Return New ModelandView (this.GetformView ());

}

// Well, Let's do Nothing with the bean for now and return:

File myfile = new file ("myfile.txt");

myfile.createnewfile ();

Try {

Return Super.onSubmit (Request, Response, Command, Errors);

} catch (exception ex) {

Return NULL;

}

}

protected void initbinder

HTTPSERVLETREQUEST REQUEST,

ServletRequestDataBinder Binder) THROWS servletexception {

// TO ACTUALLY Be Able To Convert Multipart Instance To Byte []

// we have to register a Custom Editor (in this Case THE

// ByteArraymultiparteditor

Binder.registerCustomeditor (byte []. Class, New ByteArraymultipartFileEditor ());

// Now Spring Knows How To Handle Multipart Object And Convert THEM

}

}

If you have selected the file you want to upload, file.length is not 0 when you upload files, otherwise file.length is 0. The content of the upload file is saved in the Byte [] file, this example does not process the uploaded file.

/Web-inf/fileupload/fileuploadbean.java

Package fileupload;

// snippet from FileUploadBean

Public clas fileuploadbean {

PRIVATE BYTE [] File;

Public void setfile (Byte [] file) {

THIS.FILE = file;

}

Public Byte [] getFile () {

Return file;

}

}

4. The springApp-servlet.xml file is as follows:

/Web-inf/springapp-servlet.xml

- Application Context Definition for "SpringApp" DispatcherServlet.

->

fileuploadController

Org.springframework.web.servlet.view.jstlview

/ web-inf / jsp /

.jsp

fileupload.fileUploadbean

FileUploadForm

Confirmation

"- one of the profmenties available; the maximum file size in bytes ->

100000

The value of the attribute success confirmation refers to Confirmation.jsp. InternalResourceViewResolver allows us to omit prefix (file path) and suffix (.jsp)

5. File confirmation.jsp is the confirmation page after the successful file success

/Web-inf/jsp/confirmation.jsp

<% @ Page ContentType = "Text / HTML; Charset = BIG5"%>