Servlet Three comes with default assist of file add. To make your servlet multipart conscious builders suppose to make use of @MultipartConfig
annotation. @MultipartConfig
annotation is used to point that the Servlet on which it’s declared expects requests to made utilizing the multipart/form-data MIME sort.
To make use of servlet 3.Zero api’s you must deploy your software on Java EE 6 conscious internet/app server. I’m utilizing Apache Tomcat 7.x which comes with servlet Three assist.
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package deal org.techzoo.servlet3;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Half;
@WebServlet (“/add”)
@MultipartConfig
public class FileUploadServlet extends HttpServlet {
non-public static ultimate lengthy serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
uploadFile(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
uploadFile(request, response);
}
/**
* uploadFile technique used to add file to server.
*
***/
non-public void uploadFile(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
for(Half half : request.getParts()) {
String title = half.getName();
InputStream is = request.getPart(title).getInputStream();
String fileName = getUploadedFileName(half);
FileOutputStream fos = new FileOutputStream(“c:/add/”+fileName);
int knowledge = 0;
whereas((knowledge = is.learn()) != –1) {
fos.write(knowledge);
}
fos.shut();
is.shut();
response.sendRedirect(“success.jsp”);
}
}
/**
* Technique used to get uploaded file title.
* It will parse following string and get filename
* Content material-Disposition: form-data; title=”content material”; filename=”a.txt”
**/
non-public String getUploadedFileName(Half p) {
String file = “”, header = “Content material-Disposition”;
String[] strArray = p.getHeader(header).cut up(“;”);
for(String cut up : strArray) {
if(cut up.trim().startsWith(“filename”)) {
file = cut up.substring(cut up.indexOf(‘=’) + 1);
file = file.trim().exchange(“””, “”);
System.out.println(“File title : “+file);
}
}
return file;
}
}
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Now create a jsp web page with a kind tag. This manner tag should have attribute enctype="multipart/form-data"
.
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<kind motion=“add” enctype=“multipart/form-data” technique=“publish”>
<enter sort=“file” title=“uploadFile” />
<enter sort=“submit” worth=“Add File” />
</kind>
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Output will seem like as following screenshot.
Supply techzoo.org