struts2 File Upload Download

File Upload

Introduction to File Upload in 1.struts2

Struts2 file upload requires the use of the file upload components (Commons-fileupload.jar and Commons-io.jar) provided by Apache.

The core of the Struts2 file upload is implemented by the FileUpload interceptor.

2. How to implement File upload

1> add commons-fileupload and Commons-io packages

2> On the JSP page, do the following configuration

Set the method property value of the form to post

Add a property enctype= "Multipart/form-data" to the form tag (let the submitted form data be submitted as a stream)

3> Add the following attribute to the action class and add the Get|set method

Private File xxx;

Private String Xxxfilename;

Private String Xxxcontenttype;

Note: XXX refers to the name value of the "File" > File field of the <input type=

Struts2 File Upload function, is to save the client upload files to a temporary directory, we have to do is to save the temporary directory files in the specified directory.

File download

How to implement file download in Struts2


1. Add a file to download the action class

public class downloadaction{

Private InputStream Logostream;

Public InputStream Getlogostream () {

try{

This.filename = Brand.getlogourl ();

Gets the absolute path to the file being downloaded
String FilePath = Servletactioncontext.getrequest (). Getservletcontext (). Getrealpath (Brand.getlogourl ());

System.out.println (FilePath);

Read the downloaded file
Logostream = new FileInputStream (FilePath);

return logostream;

}catch (Exception ex) {

Ex.printstacktrace ();
return null;
}
}
}

2. Add an action method to the class to return the success

public class downloadaction{

Public String Download () {

Return "Success";

}

}

3. Configure the action in Struts.xml, and result type is stream

<action name= "Download" class= "... Downloadaction "method=" Download ">
<result name= "Success" type= "Stream" >

</result>
</action>

4. In result, set the parameter InputName, the value of which must be a property of the action class with a data type of inputstream.

<action name= "Download" class= "... Downloadaction "method=" Download ">
<result name= "Success" type= "Stream" >
<param name= "InputName" >logoStream</param>
</result>
</action>

5. Control the file name of the downloaded file: Add parameter in Result: Contentdisposition


<action name= "Download" class= "... Downloadaction "method=" Download ">
<result name= "Success" type= "Stream" >
<param name= "InputName" >logoStream</param>
<param name= "contentdisposition" >attachment;filename= "${filename}" </param>
</result>
</action>

Note: FileName in ${filename} is a property in the action class

6. Control file Type: Add parameter to result: ContentType

ContentType:

Word:application/msword

Excel:application/vnd.ms-excel

Ppt:application/vnd.ms-powerpoint

Html:text/html

Text file: Text/plain

Executable file: Application/octet-stream


<action name= "Download" class= "... Downloadaction "method=" Download ">
<result name= "Success" type= "Stream" >
<param name= "InputName" >logoStream</param>
<param name= "contentdisposition" >attachment;filename= "${filename}" </param>
<param name= "ContentType" >application/octet-stream</param>
</result>
</action>

struts2 File Upload Download