Java 获取字符串的编码类型

有时候我们会遇到要获取某段字符串的编码类型

	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 "";      
	   }  

不是很准确，但基本是可以达到需求的