javax.servlet.http.Part class represents a part as uploaded to the server as part of a multipart/form-data request body. The part may represent either an uploaded file or form data. Here is one simple example to upload file using Servlet 3.0
index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><form method="post" action="/FileUploadServletExample/fileupload" enctype="multipart/form-data">Choose file <input type="file" name="file"><input type="submit" value="submit"></form></body></html>
FileUploadServlet.java
package com.pretech;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;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.Part;@MultipartConfig@WebServlet("/fileupload")public class FileUploadServlet extends HttpServlet {private static final long serialVersionUID = -7205406034336084784L;protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {Part filePart = request.getPart("file");System.out.println("filename"+ filePart.getName());String fileName = getFileName(filePart);String fileLocation="c:/temp/";InputStream inputStream = null;OutputStream outputStream = null;try {File outputFilePath = new File(fileLocation + fileName);inputStream = filePart.getInputStream();outputStream = new FileOutputStream(outputFilePath);int read = 0;final byte[] bytes = new byte[1024];while ((read = inputStream.read(bytes)) != -1) {outputStream.write(bytes, 0, read);}} catch (FileNotFoundException fne) {fne.printStackTrace();} finally {if (outputStream != null) {outputStream.close();}if (inputStream != null) {inputStream.close();}}response.setContentType("text/html;UTF-8");PrintWriter writer = response.getWriter();writer.write("File upload completed");writer.close();}private String getFileName(Part part) {for (String content : part.getHeader("content-disposition").split(";")) {if (content.trim().startsWith("filename")) {return content.substring(content.indexOf('=') + 1).trim().replace("\"", "");}}return null;}}
Output
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