In this program, we connect to the servlet’s URL of the application FileUploadSpringMVC (see this tutorial: Upload files with Spring MVC): Multipart.addFilePart("fileUpload", uploadFile2) Multipart.addFilePart("fileUpload", uploadFile1) Multipart.addFormField("keywords", "Java,upload,Spring") Multipart.addFormField("description", "Cool Pictures")
Multipart.addHeaderField("Test-Header", "Header-Value") Multipart.addHeaderField("User-Agent", "CodeJava")
MultipartUtility multipart = new MultipartUtility(requestURL, charset) * This program demonstrates a usage of the MultipartUtility class.įile uploadFile1 = new File("e:/Test/PIC1.JPG") įile uploadFile2 = new File("e:/Test/PIC2.JPG")
#JAVA APPLET FILE UPLOAD EXAMPLE CODE CODE#
Code Java Client program to upload file:Since the MultipartUtility class abstracts all the detailed implementation, a usage example would be pretty simple as shown in the following program: package
#JAVA APPLET FILE UPLOAD EXAMPLE CODE HOW TO#
Now let’s take a look at an example of how to use this utility class. List finish(): this method must be invoked lastly to complete the request and receive response from server as a list of String.
void addFilePart(String fieldName, File uploadFile): attach a file to be uploaded to the request.void addHeaderField(String name, String value): adds an HTTP header field to the request.void addFormField(String name, String value): adds a regular text field to the request.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.
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