base64之前端加密后端解密

前端引入base64.js

base64.js

/**

*

* Base64 encode / decode

*

* @author haitao.tu

* @date 2010-04-26

* @email tuhaitao@foxmail.com

*

*/

function Base64() {

// private property

_keyStr = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=”;

// public method for encoding

this.encode = function (input) {

var output = “”;

var chr1, chr2, chr3, enc1, enc2, enc3, enc4;

var i = 0;

input = _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 +

_keyStr.charAt(enc1) + _keyStr.charAt(enc2) +

_keyStr.charAt(enc3) + _keyStr.charAt(enc4);

}

return output;

}

// public method for decoding

this.decode = function (input) {

var output = “”;

var chr1, chr2, chr3;

var enc1, enc2, enc3, enc4;

var i = 0;

input = input.replace(/[^A-Za-z0-9+\/\=]/g, “”);

while (i < input.length) {

enc1 = _keyStr.indexOf(input.charAt(i++));

enc2 = _keyStr.indexOf(input.charAt(i++));

enc3 = _keyStr.indexOf(input.charAt(i++));

enc4 = _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 = _utf8_decode(output);

return output;

}

// private method for UTF-8 encoding

_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

_utf8_decode = function (utftext) {

var string = “”;

var i = 0;

var c = c1 = c2 = 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;

}

}

直接在前端js代码里调用进行加密处理



后端解密代码：

package com.base.util;

import java.io.IOException;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

/**

* BASE64算法工具类,该算法封装了对字符串,

* 字节数组的加密和字符串解密的功能.

* @author mzllon

* @version 1.0,05/21/2012

*

*/

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 (IOException e) {
e.printStackTrace();
return null;
}
}

}

调用Base64Util进行解密，并用Md5加密存入数据库：



附加一个md5加密：

package com.base.util;

import java.security.MessageDigest;

import sun.misc.BASE64Encoder;

public class PasswordMD5{

public static String createEncryptPSW(String psw) {

MessageDigest messagedigest = null;
try {
messagedigest = MessageDigest.getInstance("MD5");
messagedigest.update(psw.getBytes("UTF8"));
byte abyte0[] = messagedigest.digest();
psw=(new BASE64Encoder()).encode(abyte0);
} catch (Exception e) {
e.getMessage();

}
return psw;
}
public static void main(String[] args) {
String pwd="123";
String password= PasswordMD5.createEncryptPSW(pwd);
System.out.println(password);
}

}