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 [email protected]
*
*/
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);
}

}