Learn struts2 how to download files with a personal struts2 case
1.<!--configured in action-
<result name= "Success" type= "Stream" >
Types of files downloaded
<param name= "ContentType" >image/jpeg</param>
File input stream source
<param name= "InputName" >imageStream</param>
Set the file name of the saved files
<param name= "contentdisposition" >attachment;filename= "Document.pdf" </param>
Buffer size
<param name= "BufferSize" >1024</param>
</result>
1.1. The above parameters can be provided by getter Mode in Action! < no longer set parameters in Result >
1.2 The following case assigns a value to a variable by getter
2.javabean Concrete Implementation Code (case)
Package com.cn.web;
Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.IOException;
Import Java.io.InputStream;
Import Org.apache.struts2.ServletActionContext;
Import Com.opensymphony.xwork2.ActionSupport;
public class DownloadFile extends Actionsupport {
/**
* struts2 File Download image
*/
Private static final long serialversionuid = 1L;
Get file name
Private String imgname;
Types of files downloaded
Private String ContentType;
Length of file downloaded
Private long contentlength;
Set the file name of the saved files
Private String contentdisposition;
File input stream source
Private InputStream InputStream;
Public String getContentType () {
return contentType;
}
public void setContentType (String contentType) {
This.contenttype = ContentType;
}
Public long getcontentlength () {
return contentlength;
}
public void Setcontentlength (long contentlength) {
This.contentlength = ContentLength;
}
Public String getcontentdisposition () {
return contentdisposition;
}
public void Setcontentdisposition (String contentdisposition) {
This.contentdisposition = contentdisposition;
}
Public String Getimgname () {
return imgname;
}
public void Setimgname (String imgname) {
This.imgname = imgname;
}
Public InputStream getInputStream () {
return inputstream;
}
public void Setinputstream (InputStream inputstream) {
This.inputstream = InputStream;
}
Get the downloaded view
Public String Downloadui () {
return "Downloadui";
}
Public String Execute () throws IOException {
Determining the values of individual member variables
ContentType = "Image/jpeg";
Contentdisposition = "Attachment;filename=" + imgname + ". jpg";
String newsrc = Servletactioncontext.getservletcontext (). Getrealpath (
"/web-inf/upload" + file.separator + imgname + ". jpg");
System.out.println (NEWSRC);
InputStream = new FileInputStream (NEWSRC);
ContentLength = Inputstream.available ();
return SUCCESS;
}
}
3. Open the Struts2.xml file and configure the <result name= "success" type= "stream" in the appropriate action ></result>
<action name= "down_*" class= "Com.cn.web.DownloadFile" method= "{1}" >
<result name= "{1}" >/WEB-INF/downloadUI.jsp</result>
<!--provide content for users to download-
<result name= "Success" type= "Stream" >
<!--buffer Size--
<param name= "BufferSize" >1024</param>
</result>
</action>
4.html Code
<%@ page language= "java" import= "java.util.*" pageencoding= "UTF-8"
Contenttype= "text/html; Charset=utf-8 "%>
<%@ taglib uri= "/struts-tags" prefix= "s"%>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>struts2 File Download </title>
<meta http-equiv= "Pragma" content= "No-cache" >
<meta http-equiv= "Cache-control" content= "No-cache" >
<meta http-equiv= "Expires" content= "0" >
<meta http-equiv= "keywords" content= "keyword1,keyword2,keyword3" >
<meta http-equiv= "description" content= "This is my page" >
<body>
<a href= "down_execute?imgname=886001c3-335b-4604-b547-a659f55ddf76" > File download 1:</a>
<br/>
<a href= "down_execute?imgname=eff2d51f-192a-451c-be06-050fb6529ffd" > File download 2:</a>
<br>
<a href= "down_execute?imgname=e813e7ad-18dd-461a-87cf-2b035d41026d" > File download 3:</a>
<br>
</body>
5. What does not know schoolmate, welcome message, Mutual exchange, common progress.
This article is from the "12276706" blog, please be sure to keep this source http://12286706.blog.51cto.com/12276706/1872153
Download of struts2--file
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