How to upload file using JSP and Servlet
In this tutorial, I will like to share how to upload file on JSP page and servlet.
Note: Please add JSTL1.1 library and Apache Common FileUpload
*JSTL 1.1 library is in global libraries. (I'm using Netbean 7.3.1)JSP file
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Upload page - servlet</title>
</head>
<body>
<h1>Upload file JSP!</h1>
${uploadMessage}
<br/>
<form action="<c:url value="/uploadservlet" />" method="post" enctype="multipart/form-data">
<input type="file" id="FUploadDoc" name="afile" size="50" />
<input type="submit" name="bUpload" value="upload file"/>
</form>
</body>
</html>
web.xml Configuration
<servlet>
<servlet-name>uploadservlet</servlet-name>
<servlet-class>sys.servlet.uploadservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>uploadservlet</servlet-name>
<url-pattern>/uploadservlet</url-pattern>
</servlet-mapping>
The Servlet
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.Part;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@MultipartConfig
@SuppressWarnings("unchecked")
public class uploadservlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
File file = null;
int maxFileSize = 50000 * 1024;
int maxMemSize = 50000 * 1024;
boolean configExist = false;
// Verify the content type
String contentType = request.getContentType();
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(maxMemSize); // maximum size that will be stored in memory
factory.setRepository(new File("C:/DataUpload/"));
String workingDir = "C:/DataUpload/";
ProcessUpload(file, factory, maxFileSize,request,workingDir);
}else{
request.setAttribute("uploadMessage", "upload form must be in multipart");
}
//redirect back to upload page
request.getRequestDispatcher("/UploadPage.jsp").forward(request, response);
}
public void ProcessUpload(File file, DiskFileItemFactory factory, int maxFileSize,
HttpServletRequest request,String UploadPath) {
ServletFileUpload upload = new ServletFileUpload(factory); // Create a new file upload handler
upload.setSizeMax(maxFileSize); // maximum file size to be uploaded.
String Msg = "";
boolean fileHaveContent = false;
try {
String contentType = request.getContentType();
if ((contentType.indexOf("multipart/form-data") >= 0)) {
if(!new File(UploadPath).exists()){
new File(UploadPath).mkdir();
}
//upload using stream
Part uploadFile = request.getPart("afile");
String fileName = getFileName(uploadFile);
OutputStream out = null;
InputStream filecontent = null;
out = new FileOutputStream(new File(UploadPath + File.separator
+ fileName));
filecontent = uploadFile.getInputStream();
int read = 0;
final byte[] bytes = new byte[1024];
while ((read = filecontent.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
Msg += "New file (" + fileName + ") created at " + UploadPath;
out.close();
filecontent.close();
fileHaveContent = true;
} else {
Msg = "No File Upload";
}
request.setAttribute("uploadMessage", Msg);
} catch (Exception ex) {
request.setAttribute("uploadMessage", ex.getMessage());
}
}
private String getFileName(final Part part) {
String partHeader = part.getHeader("content-disposition");
String FileName = "";
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
FileName = content.substring(
content.indexOf('=') + 1).trim().replace("\"", "");
}
}
//means user use Browser IE to upload file, So the above method will not work. This will handle
//for user using browser IE to upload file
if(FileName.contains(":")){
String[] FileNameArr = FileName.split("\\\\");
FileName = FileNameArr[FileNameArr.length - 1];
}
return FileName;
}
}
Output
- Before Upload
- After upload finish
.bmp)
