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首先，先是加密，这里我使用了base64类

try {
String asB64 = Base64.getEncoder().encodeToString(“http://www.baidu.com”.getBytes(“utf-8”));
System.out.println(asB64);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

其次是解密，

byte[] asBytes = Base64.getDecoder().decode(asB64);
System.out.println(new String(asBytes, “utf-8”));