テスト文字列符号化およびISO-8859-1符号化文字列をUTF-8符号化に変換

/**
     *        
     * @param str
     * @return
     */
    public static String getEncoding(String str) {    
        String encode = "GB2312";    
       try {    
           if (str.equals(new String(str.getBytes(encode), encode))) {    
                String s = encode;    
               return s;    
            }    
        } catch (Exception exception) {    
        }    
        encode = "ISO-8859-1";
       try {    
           if (str.equals(new String(str.getBytes(encode), encode))) {    
                String s1 = encode;    
               return s1;    
            }    
        } catch (Exception exception1) {    
        }    
        encode = "UTF-8";    
       try {    
           if (str.equals(new String(str.getBytes(encode), encode))) {    
                String s2 = encode;    
               return s2;    
            }    
        } catch (Exception exception2) {    
        }    
        encode = "GBK";    
       try {    
           if (str.equals(new String(str.getBytes(encode), encode))) {    
                String s3 = encode;    
               return s3;    
            }    
        } catch (Exception exception3) {    
        }    
       return "";    
    }
    /**  
     *  ISO-8859-1       UTF-8    
     * @param param  
     * @return  
     */  
    public static String toUTF8(String param) {  
        if (param == null) {  
            return null;  
        } else {  
            try {  
                param = new String(param.getBytes("ISO-8859-1"), "UTF-8");  
            } catch (UnsupportedEncodingException e) {  
                e.printStackTrace();  
                return param;  
            }
        }  
        return param;  
    }