How to translate from one language to another using java

Posted on 2013-11-24
Medium Priority
Last Modified: 2016-09-01
I want to write a core java program that converts the data from one langualge to another language.for example
English to French,french to German, etc..
for this i have tried with Google Translator API for Java, but this is commertial, i am not able to run my program with out HttpReferrer and Key.
And i downloaded the webtranslator api, but i dont know how to use. So kindly provide the example to use this api.

or else, kindly provide, if you have any other possible solution.
Question by:prabhualla
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Expert Comment

ID: 39674020

Does the package you indicate have API documentation/javadocs? Can you provide a URL to the package download?

Author Comment

ID: 39674184
i think you are asking about Google Translator API.

GoogleAPI.setHttpReferrer(/*your http referrere*/);
 GoogleAPI.setKey(/*key*/); String text =
Translate.DEFAULT.execute("HELLO", Language.ENGLISH,
Language.GERMAN); System.out.println(text);

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i downloaded the jar from


Expert Comment

ID: 39674211

You stated you did not want to use the Google API. The way your post was phrased indicated that "And i downloaded the webtranslator api" - which to me said that you downloaded a non-Google API. I did a quick search for 'webtranslator api java', and there appear to be quite a few out there. e.g.:

My question was basically which one did you pick?
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Author Comment

ID: 39674300
Thanks for your response smeghammer.

Yes i tried the below one.


but i don't know how to use this, Kindly provide any sample program to use this api.

Accepted Solution

smeghammer earned 1500 total points
ID: 39674452

I just had a quick look at this - if you open the source project you will find a class called

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in the com.javanetworkframework.rb.tester package.

This test file runs through the various combinations that are supported and fires 'hello world' in various languages at the services used. You can easily test this by altering the english input to something else (line 38).

I did not go through the package in detail, but you should be able to get what you need using this test class as a starting point.

I modified the example code to simplify and use just one to/from language:
Locale srcLoc = new Locale("en");
Locale dstLoc = new Locale("es"); //try fr, de, es
AbstractWebTranslator res = (AbstractWebTranslator) ResourceBundle.getBundle("com.javanetworkframework.rb.com.freetranslation.FreeTranslationTranslatorRB",dstLoc);
String output = "en2fr\n";
String textToTranslate = "What time is it in Spain? Can I have a bacon sandwich?";
output += textToTranslate + " --> " + res.getString(textToTranslate, srcLoc);

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Try amending your input string and the 'to' language.

One thing I would note - the source files appear to be created in 2004 so I suspect that this package is not being developed any more.

Expert Comment

ID: 39674945
Here is a better GUI based example. I borrowed the tutorial from here as the basis for the GUI.

The download includes a complete source development package ('WebTranslator-all-0.2a.zip'). This can be unzipped and imported as a new project into Eclipse.  

I have a single class file and a reference to the main WebTranslator-bin-0.2a.jar file. I made a very basic textarea, language dropdown, button and associated listener. The listener just takes the value in the textarea and submits it with the appropriate to/from languages. The translated result is then placed in the textarea:
package guiTest;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JLabel;

import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Locale;
import java.util.ResourceBundle;

//this is the key import for the translation package:
import com.javanetworkframework.rb.util.AbstractWebTranslator;

public class app
  public static void main(String[] args)
      new app();

  public app()
      JFrame guiFrame = new JFrame();
      //make sure the program exits when the frame closes
      guiFrame.setTitle("Example GUI");
      //This will center the JFrame in the middle of the screen
      //Options for the JComboBox 
      String[] toLanguage = {"fr", "de", "es"};
      //The first JPanel contains a JLabel and JCombobox
      final JPanel comboPanel = new JPanel();
      final JLabel comboLbl = new JLabel("Select 'to' language:");
      final JComboBox<Object> toLanguages = new JComboBox<Object>(toLanguage);

      final javax.swing.JTextArea textArea = new javax.swing.JTextArea();
      JButton transLateBtn = new JButton( "Translate!");
      //The ActionListener class is used to handle the
      //event that happens when the user clicks the button.
      //As there is not a lot that needs to happen we can 
      //define an anonymous inner class to make the code simpler.
      transLateBtn.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent event)
                //submit the text in the textarea to an instance of the translator:
     		Locale srcLoc = new Locale("en");  //hardcoded in this example
    		Locale dstLoc = new Locale(toLanguages.getSelectedItem().toString()); //eg fr, de, es
    		AbstractWebTranslator res = (AbstractWebTranslator) ResourceBundle.getBundle(
    		String output = "";
    		String textToTranslate = textArea.getText();
    		output = res.getString(textToTranslate, srcLoc);
      //The JFrame uses the BorderLayout layout manager.
      guiFrame.add(comboPanel, BorderLayout.NORTH);
      //make sure the JFrame is visible

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Author Comment

ID: 39682736
Thanks smeghammer,

i tried the below code as u mentioned  in above.

	Locale srcLoc = new Locale("en");
		Locale dstLoc = new Locale("es"); //try fr, de, es
		AbstractWebTranslator res = (AbstractWebTranslator) ResourceBundle.getBundle("com.javanetworkframework.rb.com.freetranslation.FreeTranslationTranslatorRB",dstLoc);
		String output = null;
		String textToTranslate = "hello";
		output = res.getString(textToTranslate, srcLoc);

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but i am getting one applet, And i have choosen Allow, but i am not getting output, the applet keep on running, it is not giving any output.

please help me.

Author Comment

ID: 39682742
log file attached for your reference.

Expert Comment

ID: 39682974

You did not mention applet in your original post. The example I provided is for a standard GUI application.

However, it could easily be converted to an applet or a command-line utility. The code I provided simply demonstrates how to use the LIBRARY, and not how to build an application or applet around it.

As I noted above, you need to use the ENTIRE example Eclipse project, NOT just the code I provided. That is just the front-end on top of the translation library. You originally asked this
And i downloaded the webtranslator api, but i dont know how to use. So kindly provide the example to use this api

And that is what I provided. Other posts by yourself suggest you are an experienced java programmer and I am not going to describe the basics of building an applet or how to use Eclipse - there are plenty of resources for that out there.


Did you import the entire sample project ('WebTranslator-all-0.2a.zip')? into Eclipse
If so ,did you successfully run this sample project before using my code?
Did you create a new project and reference the webtranslator JAR? [build path/add external archives/]
Did you add the import statement to actually use the webtranslator package?
I am certainly not a java guru, so the first thing I did when I looked at this was to import the example project into Eclipse and figure out how it worked by running the PROVIDED example code and tracing through what happens. It was only when I had worked out roughly what was going on that I created my own simple project that used the library.

Author Closing Comment

ID: 39779401

Expert Comment

by:Janki Gadhiya
ID: 41781020
Hi, smeghammer

I have used your code for language translation in my simple java program, but my execution gets stuck at this line "output += textToTranslate + " --> " + res.getString(textToTranslate, srcLoc);"

I think "res.getString(textToTranslate, srcLoc);"  is not returning any thing.

Can you suggest me any solution ??

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