JEncrypt和Java构建前后端RSA加密

代码如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <script type="text/javascript" src="https://cdn.bootcss.com/jsencrypt/3.0.0-rc.1/jsencrypt.min.js"></script>
    <script>
        $(document).ready(function(){
            $("#tran").click(function(){
                $("#content").empty()
                var a = new JSEncrypt()
                var pubk = $("#pubk").val()
                a.setPublicKey(pubk);
                var ss = ""
                var str = $("#str").val()
                $("#strlen").val(str.length)

                while(str.length>37){ //RSA一次加密不要超过127字节，前台验证中文字符长度37位内，ascii可更长
                    var temp = str.substr(0,37)
                    ss+= '.'+a.encrypt(temp)
                    str = str.substr(37)
                }
                ss+= '.'+a.encrypt(str)
                ss = ss.substr(1)
                $("#content").append(ss)
            })
        })
    </script>
    <style>
        div{
            width: 90%;
            margin: 10px auto;
            float: left;
        }
        label{
            width: 100px;
        }
    </style>
</head>
<body>
    <div>
        <label for="pubk">公钥</label>
        <input type="text" id="pubk" style="width:50%">
    </div>
    <div>
        <label for="str">原字符</label>
        <input type="text" id="str">
        <button id="tran">转化</button>
    </div>
    <div>
        <label for="str">长度</label>
        <input type="text" id="strlen">
    </div>
    <div>
        <label for="content">加密后字符</label>
        <textarea id="content" rows="5" style="width: 50%;word-break:break-all">
        </textarea>
    </div>
</body>
</html>

public static String decrypt(String privateKey,String str) throws Exception{
		//base64编码的私钥
		byte[] decoded = Base64.decodeBase64(privateKey);  
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));  
		//RSA解密
		Cipher cipher = Cipher.getInstance("RSA");
		cipher.init(Cipher.DECRYPT_MODE, priKey);
		StringBuffer sb = new StringBuffer();
		String[] strArr = str.split(".");
		for(String content :strArr) {
			//64位解码加密后的字符串
			byte[] inputByte = Base64.decodeBase64(content.getBytes("UTF-8"));
			sb.append(new String(cipher.doFinal(inputByte)));
		}
		return sb.toString();
	}