A simple example of Struts2 file upload and download

A simple example of Struts2 file upload and download

I have previously reposted an upload and download article. I have sorted it out by myself and verified it.

Package com.jereh.edu. entity; import java. io. file; import java. io. fileInputStream; import java. io. fileOutputStream; import java. io. IOException; import java. io. inputStream; import java. io. outputStream; import java. io. unsupportedEncodingException; import org. apache. struts2.ServletActionContext; import com. opensymphony. xwork2.Action; public class UpLoadAction {private String uname; // user name submitted at the front end; private File f Ile; // upload the file private String fileFileName; // the file name to be uploaded is automatically submitted at the front end without additional input private String fileContentType; /the file type of the uploaded file is automatically submitted at the front end without additional input private InputStream inputStream; // The input stream used for upload can define the local variable private String fileName; // The front-end hides the downloaded file name private String downLoadPath; // download path public String getFileName () {return fileName;} public void setFileName (String fileName) throws UnsupportedEncodingException {byte [] B = fileN Ame. getBytes ("UTF-8"); String str = new String (B, "iso-8859-1"); // re-decodes the encoding upon retrieval to solve the problem of garbled characters and not displaying Chinese characters. this. fileName = str;} public String getDownLoadPath () {return downLoadPath;} public void setDownLoadPath (String downLoadPath) {this. downLoadPath = downLoadPath;} public InputStream getInputStream () {return inputStream;} public void setInputStream (InputStream inputStream) {this. inputStream = inputStream;} public Str Ing getUname () {return uname;} public void setUname (String uname) {this. uname = uname;} public File getFile () {return file;} public void setFile (File file) {this. file = file;} public String getFileFileName () {return fileFileName;} public void setFileFileName (String fileContentName) {this. fileFileName = fileContentName;} public String getFileContentType () {return fileContentType;} public void setFileCont EntType (String fileContentType) {this. fileContentType = fileContentType;} public String upFile () throws IOException {// File Upload path; String path = ServletActionContext. getServletContext (). getRealPath ("/upload/"); // File upFile = new File (path + File. separatorChar + file. getName (); File upFile = new File (path + File. separatorChar + fileFileName); upFile. getParentFile (). mkdir (); // create the path System. out. println ("file name + +++ "+ File. getName () + "---" + file. getPath (); // the uploaded file is a temporary file, Struts2, Which is saved and imported to the desired path System. out. println ("uploaded file name +++" + fileFileName + "---" + fileContentType); inputStream = new FileInputStream (file ); // read OutputStream ops = new FileOutputStream (upFile) from a temporary file; // output to the specified file byte [] B = new byte [1024]; while (inputStream. read (B, 0, B. length ))! =-1) {ops. write (B);} ops. close (); inputStream. close (); return Action. SUCCESS;} public InputStream getDownLoad () {return ServletActionContext. getServletContext (). getResourceAsStream (downLoadPath);} public String downLoadFile () {return Action. SUCCESS ;}}

Once you have configured Struts, you will understand it.

                             
  
                    /success.jsp                
                                      
              
   attachment;filename=${fileName}            
   downLoad            
                          
 

 attachment;filename=${fileName}

ContentDisposition is configured. The front-end is downloaded in the pop-up download box. Otherwise, filename is the name of the downloaded file displayed on the page.

Front-end jsp form

<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %>              UpFile               
Download


The
enctype="multipart/form-data"
Attributes must be added and the method = "post" method is submitted for data integrity.
Jsp hides the file path and file name project. You can change it to js Code.