Cómo convertir encoding en java tipo iconv, ej: UTF-8 a latin1

import org.apache.commons.io.IOUtils;

public class Iconv {

 public static void iconv(InputStream in, OutputStream out, Charset inCharset, Charset outCharset) throws IOException {
  InputStreamReader reader = new InputStreamReader(in,inCharset);
  OutputStreamWriter writer = new OutputStreamWriter(out,outCharset);
  IOUtils.copy(reader,writer);
  writer.close();
 }

Cómo se usa:

 public static void main(String[] args) throws Exception {
  utf8ToLatin1();
  latin1ToUtf8();
 }

 private static void latin1ToUtf8() throws Exception  {
  FileInputStream in = new FileInputStream("/home/pablo/Desktop/workspace/test/files/textoLatin1.txt");
  FileOutputStream out = new FileOutputStream("/tmp/textoLatin1ToUTF8.txt");
  iconv(in, out, Charset.forName("latin1"), Charset.forName("UTF-8"));
  out.close();
 }

 private static void utf8ToLatin1() throws Exception {
  FileInputStream in = new FileInputStream("/home/pablo/Desktop/workspace/test/files/textoUTF8.txt");
  FileOutputStream out = new FileOutputStream("/tmp/textoUTF8ToLatin1.txt");
  iconv(in, out, Charset.forName("UTF-8"), Charset.forName("latin1"));
  out.close();
 }

Entrada:

pablo@pablo-desktop:~/Desktop/workspace/test/files$ file --mime texto*
textoLatin1.txt: text/plain; charset=iso-8859-1
textoUTF8.txt:   text/plain; charset=utf-8

Resultado:

pablo@pablo-desktop:~/Desktop/workspace/test/files$ file --mime /tmp/texto*
/tmp/textoLatin1ToUTF8.txt: text/plain; charset=utf-8
/tmp/textoUTF8ToLatin1.txt: text/plain; charset=iso-8859-1