Converting a String ISO8859-1 to UTF-8 in Java

Question

I have a Q-encoded string variable:

String s = "=?ISO-8859-1?Q?Merve_G=FCl?=";

And I want to write it on screen with true characters: "Merve Gül".

How can I do that?

@Nick

String string = "=?ISO-8859-1?Q?Merve_G=FCl?=";
QCodec q = new QCodec();
        try 
        {
            q.decode(string);
            System.out.println(q.decode(kimdenIsim));
        } catch (DecoderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 

I am getting this error :

05-08 11:22:39.287: W/System.err(1142): org.apache.commons.codec.DecoderException: RFC 1522 violation: malformed encoded content
05-08 11:22:40.448: W/System.err(1142):     at org.apache.commons.codec.net.RFC1522Codec.decodeText(RFC1522Codec.java:102)
05-08 11:22:40.448: W/System.err(1142):     at org.apache.commons.codec.net.QCodec.decode(QCodec.java:230)
05-08 11:22:40.457: W/System.err(1142):     at com.mobil.eposta.GoruntuleActivity.EksizPosta(GoruntuleActivity.java:138)
05-08 11:22:40.457: W/System.err(1142):     at com.mobil.eposta.GoruntuleActivity.onCreate(GoruntuleActivity.java:52)
05-08 11:22:40.477: W/System.err(1142):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-08 11:22:40.477: W/System.err(1142):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
05-08 11:22:40.477: W/System.err(1142):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-08 11:22:40.497: W/System.err(1142):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-08 11:22:40.497: W/System.err(1142):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-08 11:22:40.507: W/System.err(1142):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-08 11:22:40.517: W/System.err(1142):     at android.os.Looper.loop(Looper.java:123)
05-08 11:22:40.517: W/System.err(1142):     at android.app.ActivityThread.main(ActivityThread.java:4627)
05-08 11:22:40.517: W/System.err(1142):     at java.lang.reflect.Method.invokeNative(Native Method)
05-08 11:22:40.517: W/System.err(1142):     at java.lang.reflect.Method.invoke(Method.java:521)
05-08 11:22:40.517: W/System.err(1142):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-08 11:22:40.537: W/System.err(1142):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-08 11:22:40.537: W/System.err(1142):     at dalvik.system.NativeStart.main(Native Method)

4th error line shows : q.decode(string);

Answer 1

Apache Commons Codec has a QCodec class for decoding this format. Just add the library to your project.

//String s must start with "=?" and end with "?="
QCodec q = new QCodec();
q.decode(s);

Answer 2

according to this answer is it possible this way. You need JavaMail for that. I just tested it successfully.

import javax.mail.internet.MimeUtility;

String s = "=?ISO-8859-1?Q?Merve_G=FCl?=";
String string = MimeUtility.decodeText(s);

Answer 3

Try this code

try {
    // Convert from Unicode to UTF-8
    String string = "abc\u5639\u563b";
    byte[] utf8 = string.getBytes("UTF-8");

    // Convert from UTF-8 to Unicode
    string = new String(utf8, "UTF-8");
} catch (UnsupportedEncodingException e) {
}