Download PDF File Using CXF REST / JAX-RS

By admin | May 15, 2013 | Updated : October 11, 2016 cxf, rest, No Comments

Download PDF File Using CXF REST / JAX-RS explains about downloading PDF file using CXF REST / JAX-RS API

@Produces("application/pdf")

On the above annotation, we are mapping the response as PDF mime type, you can change mime type according to different file formats

response.header("Content-Disposition", "attachment; filename=test.pdf");

We are also setting header as "Content-Disposition" in order to open file as an attachment

This tutorial is for downloading PDF file, but you can see different mime types(formats) below

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Download PDF File Using CXF REST / JAX-RS

I am going to re-use CXF REST File Upload

We are making changes on UploadServiceImpl class, just adding new method downloadFile() in order to download pdf file

package com.student;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.activation.DataHandler;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;

import org.apache.cxf.jaxrs.ext.multipart.Attachment;

public class UploadServiceImpl {
   private static final String FILE_PATH = "c:\\downloads\\test.pdf";

   @GET
   @Path("/downloadFile")
   @Produces("application/pdf")
   public Response downloadFile() {
      File file = new File(FILE_PATH);
      ResponseBuilder response = Response.ok((Object) file);
      response.header("Content-Disposition", "attachment; filename=test.pdf");
      return response.build();
   }

   @POST
   @Path("/uploadFile")
   @Consumes(MediaType.MULTIPART_FORM_DATA)
   public Response uploadFile(List<Attachment> attachments, @Context HttpServletRequest request) {
      for (Attachment attachment : attachments) {
         DataHandler handler = attachment.getDataHandler();
         try {
            InputStream stream = handler.getInputStream();
            MultivaluedMap<String, String> map = attachment.getHeaders();
            System.out.println("fileName Here" + getFileName(map));
            OutputStream out = new FileOutputStream(new File("C:/uploads/" + getFileName(map)));

            int read = 0;
            byte[] bytes = new byte[1024];
            while ((read = stream.read(bytes)) != -1) {
               out.write(bytes, 0, read);
            }
            stream.close();
            out.flush();
            out.close();
         } catch (Exception e) {
            e.printStackTrace();
         }
      }

      return Response.ok("file uploaded").build();
   }

   private String getFileName(MultivaluedMap<String, String> header) {
      String[] contentDisposition = header.getFirst("Content-Disposition").split(";");
      for (String filename : contentDisposition) {
         if ((filename.trim().startsWith("filename"))) {
            String[] name = filename.split("=");
            String exactFileName = name[1].trim().replaceAll("\"", "");
            return exactFileName;
         }
      }
      return "unknown";
   }
}

Run Client

You can test this service in two different ways

1) Using Java Program

package com.client;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

public class DownloadFileClient {

   public static void main(String[] args) {
      try {
         URL url = new URL("http://localhost:8080/CXFRestUpload/services/rest/downloadFile");
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         conn.setDoOutput(true);
         conn.setRequestMethod("GET");
         conn.setRequestProperty("Content-Type", "application/json");
         if (conn.getResponseCode() == 200) {
            InputStream inputStream = conn.getInputStream();
            OutputStream output = new FileOutputStream("C:/downloads/copyOfTest.pdf");
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
               output.write(buffer, 0, bytesRead);
            }
            output.close();
         } else {
            Scanner scanner = new Scanner(conn.getErrorStream());
            System.out.println(scanner.next());
            scanner.close();
         }
         conn.disconnect();
      } catch (MalformedURLException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

Output

2) Using Browser

Download PDF File Using CXF REST / JAX-RS

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Download PDF File Using CXF REST / JAX-RS

Run Client

Output

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