Jersey (JAX-RS) single file upload example

Jersey provides an easy mechanism to let clients upload files to the server. In this tutorial, we will learn a single file upload to Jersey (JAX-RS) endpoint.

1. Include Jersey media multipart dependency in Gradle

File: build.gradle (snippet)

....
dependencies {
     compile 'org.springframework.boot:spring-boot-starter-web',
     		 'org.springframework.boot:spring-boot-starter-jersey',
     		 'org.glassfish.jersey.media:jersey-media-multipart:2.+', 
    		 'org.springframework.boot:spring-boot-starter-jdbc',
    		 'org.springframework.boot:spring-boot-devtools',	 
    		 'com.h2database:h2:1.4.+'
    		 
    testCompile 'org.springframework.boot:spring-boot-starter-test'
}
....

Jersey provides multipart form data support using a separate extension. We need to include that library as a dependency in the application. Include 'org.glassfish.jersey.media:jersey-media-multipart:2.+' as a compile-time dependency.

2. HTML form with single file input

File: /src/main/resources/static/file-upload.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Upload File Test</title>
</head>
<body>
	<h2>Upload file</h2>
	<form action="/upload/file" enctype="multipart/form-data" method="post">
		<label>Select File</label><input type= "file" name="file" /> <br/><br/>
		<label>Tags</label> <input name="tags" maxlength="10"/> <br/><br/>
		<input type="submit" title="Save"/>
	</form>
</body>
</html>

An HTML form with multipart/form-data support with single file selection.

3. Use @FormDataParam injection

We can inject named multipart form values (File, binary, text, etc.) using @FormDataParam, For e.g. form elements with name file and tags.

File: /src/main/java/in/geekmj/resource/FileUploadResource.java

package in.geekmj.resource;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.util.List;

import javax.ws.rs.Consumes;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.media.multipart.BodyPartEntity;
import org.glassfish.jersey.media.multipart.FormDataBodyPart;
import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataMultiPart;
import org.glassfish.jersey.media.multipart.FormDataParam;
import org.springframework.stereotype.Component;

/*
 * 
 * @author geekmj Three ways to get Form data in Jersey
 */
@Path("/upload")

@Component
public class FileUploadResource {

	@Path("/file")
	@POST
	@Consumes(MediaType.MULTIPART_FORM_DATA)
	public Response uploadFile(@DefaultValue("") @FormDataParam("tags") String tags, 
				@FormDataParam("file") InputStream file,
				@FormDataParam("file") FormDataContentDisposition fileDisposition) {

		String fileName = fileDisposition.getFileName();
		
		saveFile(file, fileName);
		
		String fileDetails = "File saved at /Volumes/Drive2/temp/file/" + fileName + " with tags "+ tags;

		System.out.println(fileDetails);

		return Response.ok(fileDetails).build();
	}
	
	private void saveFile(InputStream file, String name) {
		try {
			/* Change directory path */
			java.nio.file.Path path = FileSystems.getDefault().getPath("/Volumes/Drive2/temp/file/" + name); 
			/* Save InputStream as file */
			Files.copy(file, path);
		} catch (IOException ie) {
			ie.printStackTrace();
		}
	}

}

Using @FormDataParam we have injected the input type file as InputStream and its FileDataContentDisposition. We have injected text input field tags also.

4. Test single file upload

Download the complete source code for this project and then follow this instruction to run the application.

Go to https://localhost:8080/file-upload.html

Single file upload to jersey endpoint demo

Mrityunjay

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