JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to upload file using Jersey restful web services?


In this page you will see an example for how to upload a file using Jersey API in restful web services.

In order to implement file upload feature, include jersey-multipart dependency in your pom.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    			http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>RestfulWebServices</groupId>
	<artifactId>RestfulWebServices</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<dependencies>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-server</artifactId>
			<version>1.17</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey</groupId>
			<artifactId>jersey-servlet</artifactId>
			<version>1.17</version>
		</dependency>
		<dependency>
			<groupId>com.sun.jersey.contribs</groupId>
			<artifactId>jersey-multipart</artifactId>
			<version>1.17</version>
		</dependency>
	</dependencies>
</project>

web.xml file reference:

<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	    
    <servlet>
		<servlet-name>jersey-serlvet</servlet-name>
			<servlet-class>
                     com.sun.jersey.spi.container.servlet.ServletContainer
                </servlet-class>
		<init-param>
		     <param-name>jersey.config.server.provider.packages</param-name>
		     <param-value>com.java2novice.restful</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
  
    <servlet-mapping>
        <servlet-name>jersey-serlvet</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

Here is the HTML upload form:

<!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=UTF-8">
<title>Upload File Example</title>
</head>
<body>
	<h1>Upload File</h1>
    <form action="rest/test/upload" method="post" enctype="multipart/form-data">
    	<p>Select a file : <input type="file" name="file"/></p>
		<input type="submit" value="Upload File" />
    </form>
</body>
</html>

Here is the upload service class, we are using @FormDataParam annotation to receive uploaded file and FormDataContentDisposition to receive file properties like name, header, etc.

package com.java2novice.restful;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import com.sun.jersey.core.header.FormDataContentDisposition;
import com.sun.jersey.multipart.FormDataParam;

@Path("test")
public class RestUploadService {

	private static final String FOLDER_PATH = "C:\my_files\";
	
	@POST
	@Path("/upload")
	@Consumes(MediaType.MULTIPART_FORM_DATA)
	@Produces(MediaType.TEXT_PLAIN)
	public String uploadFile(@FormDataParam("file") InputStream fis,
					@FormDataParam("file") FormDataContentDisposition fdcd) {
 
		OutputStream outpuStream = null;
		String fileName = fdcd.getFileName();
		System.out.println("File Name: " + fdcd.getFileName());
		String filePath = FOLDER_PATH + fileName;
		
		try {
			int read = 0;
			byte[] bytes = new byte[1024];
			outpuStream = new FileOutputStream(new File(filePath));
			while ((read = fis.read(bytes)) != -1) {
				outpuStream.write(bytes, 0, read);
			}
			outpuStream.flush();
			outpuStream.close();
		} catch(IOException iox){
			iox.printStackTrace();
		} finally {
			if(outpuStream != null){
				try{outpuStream.close();} catch(Exception ex){}
			}
		}
		return "File Upload Successfully !!";
 	}
}

Try below URL to upload file:

http://localhost:8080/RestfulWebServices/index.html

User Upload Form

Output

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Interface and its usage
Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
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