检测字符串编码格式

方法如下，正确编码打印不会乱码（不区分大小写）

private static void testEncode(String str) throws UnsupportedEncodingException{
System.out.println(str+"----------------");
System.out.println(new String(str.getBytes(), "GB2312"));
System.out.println(new String(str.getBytes(), "UTF-8"));
System.out.println(new String(str.getBytes(), "GBK"));
System.out.println(new String(str.getBytes(), "ISO8859_1"));
System.out.println(new String(str.getBytes(), "ASCII"));
System.out.println(new String(str.getBytes(), "GB18030"));
System.out.println(new String(str.getBytes(), "UTF-16"));
System.out.println(new String(str.getBytes(), "Unicode"));
}

20200606：优化：

    private  void testEncode(String str) throws UnsupportedEncodingException{
         Set names=Charset.availableCharsets().keySet();
          for (Iterator iter = names.iterator(); iter.hasNext();) {
              String charsetName = (String) iter.next();
              if(Charset.isSupported(charsetName)&&new String(str.getBytes(), charsetName).contentEquals(str)){
                  System.out.println(charsetName);
             }
         }
    }

此种方法是获取系统所有支持的charset@参考文章