中文字符级转换

public class Chinese { 2   public static String toUnicode(String strvalue) { 3     try { 4       if (strvalue == null) { 5         return null; 6       } 7       else { 8         strvalue = new String(strvalue.getBytes("GBK"), "ISO8859_1"); 9         return strvalue;10       }11     }12     catch (Exception e) {13       return "";14     }15   }16   17   public static String toChinese(String strvalue) {18     try {19       if (strvalue == null) {20         return "";21       }22       else {23         strvalue = new String(strvalue.getBytes("ISO8859_1"), "GBK");24         return strvalue;25       }26     }27     catch (Exception e) {28       return "";29     }30   }31   32   public static String chinese(String a) {33     try {34       return new String(a.getBytes("ISO-8859-1"));35     }36     catch (UnsupportedEncodingException ex) {37       return null;38     }39   }40 }