Base64前后端编解码

转自 https://blog.youkuaiyun.com/shuimofengyang/article/details/78530791

前端

base64.js

//base64加密 解密
 
/* //1.加密  
var result = Base.encode('125中文');  //--> "MTI15Lit5paH"
  
//2.解密  
var result2 = Base.decode(result); //--> '125中文'
*/
 
~(function(root, factory) {
  if (typeof define === "function" && define.amd) {
    define([], factory);
  } else if (typeof module === "object" && module.exports) {
    module.exports = factory();
  } else {
    root.Base = factory();
  }
}(this, function() {
   'use strict';
   
    function Base64() {
        // private property
        this._keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    }
    //public method for encoding
    Base64.prototype.encode = function (input) {
        var output = "", chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0;
        input = this._utf8_encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
        }
        return output;
    }
 
    // public method for decoding
    Base64.prototype.decode = function (input) {
        var output = "", chr1, chr2, chr3, enc1, enc2, enc3, enc4, i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = this._utf8_decode(output);
        return output;
    }
    // private method for UTF-8 encoding
    Base64.prototype._utf8_encode = function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
    
        }
        return utftext;
    }
 
    // private method for UTF-8 decoding
    Base64.prototype._utf8_decode = function (utftext) {
        var string = "", i = 0, c = 0, c1 = 0, c2 = 0, c3 = 0;
        while ( i < utftext.length ) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    }
    
    var Base = new Base64();
    
    return Base;
}));

引入base64.js

import { Base } from '/**/base64.js';

使用

function submitForm(){
		    	
			var str1=document.getElementById('j_username').value.trim();
			var result = Base.encode(str1);
		    	
		    }

 后端

工具类

package com.sasis.util;
 
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
 
public final class BASE64Util {
 
	/**
	 * 采用BASE64算法对字符串进行加密
	 * @param base 原字符串
	 * @return 加密后的字符串
	 */
	public static final String encode(String base){
		return BASE64Util.encode(base.getBytes());
	}
	
	/**
	 * 采用BASE64算法对字节数组进行加密
	 * @param baseBuff 原字节数组
	 * @return 加密后的字符串
	 */
	public static final String encode(byte[] baseBuff){
		return new BASE64Encoder().encode(baseBuff);
	}
	
	/**
	 * 字符串解密，采用BASE64的算法
	 * @param encoder 需要解密的字符串
	 * @return 解密后的字符串
	 */
	public static final String decode(String encoder){
		try {
			BASE64Decoder decoder = new BASE64Decoder();
			byte[] buf = decoder.decodeBuffer(encoder);
			return new String(buf);
		} catch (Exception e) {
			
			return null;
		}
	}
}

使用

String username=BASE64Util.decode(username1);