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MultipartUtility(String requestURL, String charset): creates a new instance of this class for a given request URL and charset.It has one constructor and three methods: Public void addFormField(String name, String value) This utility class uses class and follows the RFC 1867 (Form-based File Upload in HTML) to make an HTTP POST request with multipart/form-data content type in order to upload files to a given URL.

Writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), OutputStream = httpConn.getOutputStream() tRequestProperty("User-Agent", "CodeJava Agent") "multipart/form-data boundary=" + boundary) HttpConn = (HttpURLConnection) url.openConnection() creates a unique boundary based on time stampīoundary = "=" + System.currentTimeMillis() + "="

Public MultipartUtility(String requestURL, String charset) * This constructor initializes a new HTTP POST request with content type Private static final String LINE_FEED = "\r\n" * This utility class provides an abstraction layer for sending multipart HTTP Code Java multipart utility class:We build the utility class called MultipartUtility with the following code: package Let’s examine this interesting solution now. In this post, you will learn how to code a Java client program that upload files to a web server programmatically.In the article Upload file to servlet without using HTML form, we discussed how to fire an HTTP POST request to transfer a file to a server – but that request’s content type is not of multipart/form-data, so it may not work with the servers which handle multipart request and it requires both client and server are implemented in Java.To overcome that limitation, in this article, we are going to discuss a different solution for uploading files from a Java client to any web server in a programmatic way, without using upload form in HTML code.