mport java.io.UnsupportedEncodingException;  
import java.net.URLDecoder;  
import java.net.URLEncoder;  
  
  
public class UTFTest {  
  public static void main(String[] args) {  
    String str = "测试字符转换 hello word"; //默认环境，已是UTF-8编码  
    try {  
      String strGBK = URLEncoder.encode(str, "GBK");  
      System.out.println(strGBK);  
      String strUTF8 = URLDecoder.decode(str, "UTF-8");  
      System.out.println(strUTF8);  
    } catch (UnsupportedEncodingException e) {  
      e.printStackTrace();  
    }  
  }  
}