1、先找到登录页面，然后再找到登录的方法。可以看到Service.asExcute('ISignOnByDWR','login' ,[{verifyCode:verifyCode,staffCode:username,password:password｝]这里就是把前端的用户名密码传到后端的。不能进行密码明文传输，就要在数据交换之前进行加密。
2、这个是jsp页面，要想使用base64，要先引入jquery.base64.js,这个要自己下载。
3、引入之后，就要对用户名，密码进行加密。var password = $.base64.encode(document.getElementById("password").value);$.base64.encode 这个就是在进行加密。
4、这个是定义的base瀵鸦铙邮64加密和解密的方法。;(function($) { var b64 = "A蚱澄堆别BCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", a256 = '', r64 = [256], r256 = [256], i = 0; var UTF8 = { encode: function(strUni) { var strUtf = strUni.replace(/[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz function(c) { var cc = c.charCodeAt(0); return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f); }) .replace(/[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz function(c) { var cc = c.charCodeAt(0); return String.fromCharCode(0xe0 | cc >> 12, 0x80 | cc >> 6 & 0x3F, 0x80 | cc & 0x3f); }); return strUtf; }, decode: function(strUtf) { var strUni = strUtf.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars function(c) { // (note parentheses for precence) var cc = ((c.charCodeAt(0) & 0x0f) << 12) | ((c.charCodeAt(1) & 0x3f) << 6) | (c.charCodeAt(2) & 0x3f); return String.fromCharCode(cc); }) .replace(/[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars function(c) { // (note parentheses for precence) var cc = (c.charCodeAt(0) & 0x1f) << 6 | c.charCodeAt(1) & 0x3f; return String.fromCharCode(cc); }); return strUni; } }; while(i < 256) { var c = String.fromCharCode(i); a256 += c; r256[i] = i; r64[i] = b64.indexOf(c); ++i; } function code(s, discard, alpha, beta, w1, w2) { s = String(s); var buffer = 0, i = 0, length = s.length, result = '', bitsInBuffer = 0; while(i < length) { var c = s.charCodeAt(i); c = c < 256 ? alpha[c] : -1; buffer = (buffer << w1) + c; bitsInBuffer += w1; while(bitsInBuffer >= w2) { bitsInBuffer -= w2; var tmp = buffer >> bitsInBuffer; result += beta.charAt(tmp); buffer ^= tmp << bitsInBuffer; } ++i; } if(!discard && bitsInBuffer > 0) result += beta.charAt(buffer << (w2 - bitsInBuffer)); return result; } var Plugin = $.base64 = function(dir, input, encode) { return input ? Plugin[dir](input, encode) : dir ? null : this; }; Plugin.btoa = Plugin.encode = function(plain, utf8encode) { plain = Plugin.raw === false || Plugin.utf8encode || utf8encode ? UTF8.encode(plain) : plain; plain = code(plain, false, r256, b64, 8, 6); return plain + '===='.slice((plain.length % 4) || 4); }; Plugin.atob = Plugin.decode = function(coded, utf8decode) { coded = String(coded).split('='); var i = coded.length; do {--i; coded[i] = code(coded[i], true, r64, a256, 6, 8); } while (i > 0); coded = coded.join(''); return Plugin.raw === false || Plugin.utf8decode || utf8decode ? UTF8.decode(coded) : coded; };}(jQuery));
5、数据传输到后端也要进行解密。java后端进行解密。tring pass=decode(newpwd);decode就是解密的方法，需要自己定义方法。
6、decode自定义的方法。//base64解密方法 public static String decode烫喇霰嘴(String s) { byte[] b = null; String result = null; if (s != null) { BASE64Decoder decoder = new BASE64Decoder(); try { b = decoder.decodeBuffer(s); result = new String(b, "utf-8"); } catch (Exception e) { e.printStackTrace(); } } return result; }
7、java端还需要导入一个包，import sun.misc.BASE64Decoder;不导入这个包，解密无法使用。
8、到这里加密和解密就结束了，该进行debug验证了。先看传入的用户名密码是否转码。可以看到，用户名密码都已经加密了。就这样完成了加密和解密。
