Multipart file upload in java (Version 2)

July 7, 2009 ICE, The Fascinator Desktop, eResearch, java 1 Comment

Time to blog my multipart file upload version 2. In this version I am no longer using the MultiPartFormOutputStream.java (see my previous blog: http://lindaocta.com/?p=185)

In this version, I use java dependencies:

Transformer_two.java code:

[html]
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.commons.io.IOUtils;
 
class transformer_two{
    public static void main(String [] args) {
        String convertUrl = "http://ice-service.usq.edu.au/api/convert/";
        if(args.length == 1) {
            String fileName = args[0];
            System.out.println(fileName);
            File f = new File(fileName);
            if(f.exists()) {
                String extResult = getExtension(f);
                if (!extResult.startsWith("Error")) {
                    convertUrl = convertUrl + extResult;
                    getRendition(f, convertUrl);
                }
            } else {
                System.out.println("Error: file doesn't exist!");
            }
        } else {
            System.out.println("Usage: java transformer fileName");
        }
    }
 
    public static void getRendition (File sourceFile, String convertUrl) {
        try{
                HttpClient client = new HttpClient();  
                PostMethod filePost = new PostMethod(convertUrl);
                Part[] parts = {
                        new StringPart("zip", "1"),
                        new StringPart("toc", "1"),
                        new StringPart("pdfLink", "1"),
                        new StringPart("pathext", ""),
                        new StringPart("template", getTemplate()),
                        new FilePart("file", sourceFile)
                };
               
                filePost.setRequestEntity(new MultipartRequestEntity(parts, filePost.getParams()));
                client.executeMethod(filePost);
               
                //Get Response
                InputStream is = filePost.getResponseBodyAsStream();
                String[] filePart = sourceFile.getName().split("\\.");
                System.out.println(sourceFile.getName());
                String outputFilename = "/tmp/"+ filePart[0] + ".zip";
                FileOutputStream fos = new FileOutputStream(outputFilename);
                IOUtils.copy(is, fos);
               
                is.close();
                fos.close();
                System.out.println("Rendition zip file is located at: " + outputFilename);
        } catch (Exception e) {
            System.out.println("An error occurred: " + e.getClass());
            e.printStackTrace();
        }
    }
 
    private static String getExtension(File fileObject) {
        /** getExtension method
         * @param File fileObject
         * @return String
         */
        String[] parts = fileObject.getName().split("\\.");
        String ext = "";
        if (parts.length == 2) {
            ext = parts[1];
            return ext;
        }
        return "Error: Unable to detect file extension properly!";
    }

    private static String getTemplate (){
        String template = "<html>" +
  "<head>" +
    "<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'/>" +
    "<title>Default Template</title>" +
    "<style type='text/css'>" +
      ".rendition-links { text-align: right; }" +
      ".body table td { vertical-align: top; }" +
    "</style>" +
    "<style class='sub style-css' type='text/css'></style>" +
  "</head>" +
  "<body>" +
    "<div class='rendition-links'>" +
      "<span class='ins source-link'></span>" +
      "<span class='ins slide-link'></span>" +
      "<span class='ins pdf-rendition-link'></span>" +
    "</div>" +
    "<h1 class='ins title'></h1>" +
    "<div class='ins page-toc'></div>" +
    "<div class='ins body'></div>" +
  "</body>" +
"</html>";
        return template;
    }
}

To run the new transformer_two.java:

  1. download the code from: transformer_two.java and save as transformer_two.java
  2. create “lib” folder in the same level
  3. Put all the jar file from the downloaded dependencies above in “lib” folder
  4. Compile transformer_two.java:
    [html]
    javac -d . -classpath ./lib/commons-httpclient-3.1.jar:./lib/commons-io-1.4.jar transformer_two.java
  5. To run transformer_two:
    [html]
    java -classpath .:./lib/commons-httpclient-3.1.jar:./lib/commons-io-1.4.jar:./lib/commons-logging-1.1.1.jar:./lib/commons-codec-1.3.jar transformer_two ABSOLUTE_PATH_TO_YOUR_DOCUMENT

Multipart file upload in java (Version 1)

July 2, 2009 ICE, The Fascinator Desktop, eResearch, java 1 Comment

Uploading Multipart file through java is not that easy. I need to write this code for the Transformer (I don’t have a chance to write the wiki yet :P ), the bridge between The Fascinator desktop and Ice-Service.

Since I am trying my best to remember java syntax again, I am confuse which library to use. In this blog, I will put up the first version of multipart upload code, so for those who would like to use Ice-Service to get the rendered version of your documents, you can use this code independently :)
From this website http://forums.sun.com/thread.jspa?threadID=451245&forumID=31, I found a class that I can use directly, you can download the code from MultiPartFormOutputStream.java

And below are my transformer.java code:

[html]
import java.io.*;
import java.net.*;

class transformer{
    public static void main(String [] args) {
        String convertUrl = "http://ice-service.usq.edu.au/api/convert/";
        if(args.length == 1) {
            String fileName = args[0];
            System.out.println(fileName);
            File f = new File(fileName);
            if(f.exists()) {
                getRendition(convertUrl, f);
            } else {
                System.out.println("Error: file doesn't exist!");
            }
        } else {
            System.out.println("Usage: java transformer fileName");
        }
    }
   
    public static void getRendition (String convertUrl, String fileName) {
        getRendition(convertUrl, new File(fileName));
    }
   
    public static void getRendition (String convertUrl, File sourceFile) {
        String[] parts = sourceFile.getName().split("\.");
        String ext = "";
        if(parts.length == 2) { // check we have exactly two parts
            ext = parts[1];
        } else {
            System.out.println("Error: Unable to detect file extension properly!");
            return;
        }
       
        System.out.println("convertUrl: " + convertUrl);
        convertUrl = convertUrl + ext;
        System.out.println("fileName: " + sourceFile.getAbsolutePath());
       
        try{
                //Create connection
                URL url = new URL(convertUrl);
               
                //create a boundary string
                String boundary = MultiPartFormOutputStream.createBoundary();
                URLConnection urlConn = MultiPartFormOutputStream.createConnection(url);
                urlConn.setRequestProperty("Accept", "*/*");
                urlConn.setRequestProperty("Content-Type",
                    MultiPartFormOutputStream.getContentType(boundary));
                //set some other request headers...
                urlConn.setRequestProperty("Connection", "Keep-Alive");
                urlConn.setRequestProperty("Cache-Control", "no-cache");
                //no need to connect cuz getOutputStream() does it
                MultiPartFormOutputStream out =
                    new MultiPartFormOutputStream(urlConn.getOutputStream(), boundary);

                //Setting up all the options
                out.writeField("zip", "1");
                out.writeField("toc", "1");
                out.writeField("pdfLink", "1");
                out.writeField("pathext", "");
                out.writeField("template", getTemplate());
                out.writeFile("file", "application/zip", sourceFile);
                out.close();
               
                //Get Response 
                InputStream is = urlConn.getInputStream();
                BufferedReader rd = new BufferedReader(new InputStreamReader(is));
               
                //zip the file and store in the /tmp directory
                String outputFilename = "/tmp/rendition.zip";
                FileOutputStream fos = new FileOutputStream(outputFilename);
                Writer fileout = new OutputStreamWriter(fos);
                int ch;
                while ((ch = rd.read()) > -1) {
                    fileout.write((char)ch);
                }
                fileout.close();

               
        } catch (Exception e) {
            System.out.println("An error occurred: " + e.getClass());
            //e.printStackTrace();
        }
    }
   
    private static String getTemplate (){
        String template = "<html>" +
  "<head>" +
    "<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'/>" +
    "<title>Default Template</title>" +
    "<style type='text/css'>" +
      ".rendition-links { text-align: right; }" +
      ".body table td { vertical-align: top; }" +
    "</style>" +
    "<style class='sub style-css' type='text/css'></style>" +
  "</head>" +
  "<body>" +
    "<div class='rendition-links'>" +
      "<span class='ins source-link'></span>" +
      "<span class='ins slide-link'></span>" +
      "<span class='ins pdf-rendition-link'></span>" +
    "</div>" +
    "<h1 class='ins title'></h1>" +
    "<div class='ins page-toc'></div>" +
    "<div class='ins body'></div>" +
  "</body>" +
"</html>";
        return template;
    }
}

To use the code, simply put download both transformer.java and MultiPartFormOutputStream.java in the same directory and compile transformer.java:

[html]
lindaoctalina$ javac transformer.java
lindaoctalina$ java transformer ABSOLUTE_PATH_TO_YOUR_DOCUMENT

Your file will be saved to /tmp directory called rendition.zip

In my next few blogs, I will put up my enhanced version of this transformer.java. I am not using the MultiPartFormOutputStream.java anymore. I will also blog the transformer in php version (since I have the code somewhere when I did Open Journal System project)