Encontre este proyecto en Google Code el nos permite usar Google Translate en nuestras aplicaciones Java.
Su uso es de lo mas sencillo:
import com.google.api.translate.Language;
import com.google.api.translate.Translate;
public class Main {
public static void main(String[] args) {
try {
String translatedText = Translate.translate("Hola mundo", Language.SPANISH, Language.ENGLISH);
System.out.println(translatedText);
} catch (Exception ex) {
ex.printStackTrace(); }
}
}
Tags: Enables using Google Translate from a Java application

Thank you very much for your text about this topic
Ayuda, tengo este codigo:
public static void main(String[] args) {
try {
String translatedText = Translate.translate(”Hola mundo”,
Language.SPANISH,Language.ENGLISH);
System.out.println(translatedText);
} catch (Exception ex) {
System.out.print(ex.getMessage());
}
}
y agregado al classpath: “google-api-translate-java-0.92.jar”
y NO me traduce ME sale ERROR que hago (Avisar a mi email: dmcoding hotmail com)
Gracias
David, postea el error que te marca o hazme llegar tu codigo de ser posible
Antes debes llamar al metodo serReferer.
GoogleAPI.serReferer(”http://www.google.com”);
Gracias Mauro, yo tuve algunos problemas con el referer (no sabía cual era) pero se ha solucionado.
it didn’t work for me the error is given below if u have any idea what to do let me know
java.lang.Exception: [google-api-translate-java] Error retrieving translation.
at com.google.api.GoogleAPI.retrieveJSON(GoogleAPI.java:136)
at com.google.api.translate.Translate.execute(Translate.java:69)
at com.google.api.translate.Translate.translate(Translate.java:192)
at GoogleTranslator.main(GoogleTranslator.java:23)
Caused by: java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:384)
at java.net.Socket.connect(Socket.java:546)
at java.net.Socket.connect(Socket.java:495)
at sun.net.NetworkClient.doConnect(NetworkClient.java:178)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:409)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
at sun.net.www.http.HttpClient.(HttpClient.java:240)
at sun.net.www.http.HttpClient.New(HttpClient.java:321)
at sun.net.www.http.HttpClient.New(HttpClient.java:338)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:935)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:876)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:801)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:979)
at com.google.api.GoogleAPI.retrieveJSON(GoogleAPI.java:115)