Struts2 (b)

1:stream

<result-type name="stream" class="Org.apache.struts2.result.StreamResult"/>

A custom Result type for sending raw data (via an InputStream) directly to the HttpServletResponse. Very useful for allowing users to download content.

This result type takes the following parameters:

• ContentType -The stream Mime-type as sent to the Web browser (default = Text/plain).
• contentlength -The stream length in bytes (The browser displays a progress bar).
• contentdisposition -The content disposition header value for specifing the file name (default = inline, values a Re typically attachment;filename= "Document.pdf".
• InputName -the name of the InputStream property from the chained action (default = InputStream).

Step 1: Develop an actionthat provides a getinputstream (): InputStream

Public class downaction extends Actionsupport {

@Override

Public String Execute () throws Exception {

System. err. println (" Judging the user's points, judging the state of the user . ");

return SUCCESS;

}

Public InputStream getInputStream () throws Exception {

String Path = Servletactioncontext. Getservletcontext (). Getrealpath ("/files/yy.zip");

InputStream in = new fileinputstream (path);

return in;

}

}

Step 2: Configure to stuts.xml and return the <result type="stream"/>

<action name= "Down" class="Cn.down.DownAction">

<result type="stream"></result>

</action>

<action name= "Down" class="Cn.down.DownAction">

<result type="Stream">

<param name="ContentType">application/force-download</param>

<param name="contentdisposition">attachment;filename= "Document.zip" </param>

</result>

</action>

Additional:

1: Modify name when downloading

String name = " my file . zip";

Name = Urlencoder. encode (Name, "UTF-8");

Actioncontext. GetContext (). Put ("FileName", name);

To take a value in XML :

use OGNL in XML to take a value, is through ${...}

<action name= "Down" class="Cn.struts2.down.DownAction">

<result type="Stream">

<param name="ContentType">application/force-download</param>

<param name="contentdisposition">attachment;filename= "${filename}" </param>

</result>

</action>

-- Specify the method name by inputname :

<action name= "Down" class="Cn.struts2.down.DownAction">

<result type="Stream">

<param name="ContentType">application/force-download</param>

<param name="contentdisposition">attachment;filename= "${filename}" </param>

<!-- in downaction.getdownfile (): InputStream--

<param name="InputName">downfile</param>

</result>

</action>

Public InputStream Getdownfile () throws Exception {

String Path = Servletactioncontext. Getservletcontext (). Getrealpath ("/files/yy.zip");

InputStream in = new fileinputstream (path);

return in;

}

Struts2 (b)