实现js自动登录用户名和密码base64加解密

1.利用后台将用户名和密码进行base64加密，浏览器输入登录地址url进行登录

var Base64={_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",encode:function(e){var t="";var n,r,i,s,o,u,a;var f=0;e=Base64._utf8_encode(e);while(f<e.length){n=e.charCodeAt(f++);r=e.charCodeAt(f++);i=e.charCodeAt(f++);s=n>>2;o=(n&3)<<4|r>>4;u=(r&15)<<2|i>>6;a=i&63;if(isNaN(r)){u=a=64}else if(isNaN(i)){a=64}t=t+this._keyStr.charAt(s)+this._keyStr.charAt(o)+this._keyStr.charAt(u)+this._keyStr.charAt(a)}return t},decode:function(e){var t="";var n,r,i;var s,o,u,a;var f=0;e=e.replace(/[^A-Za-z0-9+/=]/g,"");while(f<e.length){s=this._keyStr.indexOf(e.charAt(f++));o=this._keyStr.indexOf(e.charAt(f++));u=this._keyStr.indexOf(e.charAt(f++));a=this._keyStr.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r)}if(a!=64){t=t+String.fromCharCode(i)}}t=Base64._utf8_decode(t);return t},_utf8_encode:function(e){e=e.replace(/rn/g,"n");var t="";for(var n=0;n<e.length;n++){var r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r)}else if(r>127&&r<2048){t+=String.fromCharCode(r>>6|192);t+=String.fromCharCode(r&63|128)}else{t+=String.fromCharCode(r>>12|224);t+=String.fromCharCode(r>>6&63|128);t+=String.fromCharCode(r&63|128)}}return t},_utf8_decode:function(e){var t="";var n=0;var r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3}}return t}}

    //抓取浏览器访问路径
    var request = {
            QueryString: function (val) {
                var uri = window.location.search;
                var re = new RegExp("" + val + "\=([^\&\?]*)", "ig");
                return ((uri.match(re)) ? (uri.match(re)[0].substr(val.length + 1)) : null);
            }
        }


        var userNameBase64 = request.QueryString("userName"); //用户名
        var userPasswordBase64 = request.QueryString("userPassword"); //密码
        //base64解密
        var userName = Base64.decode(userNameBase64);
        var userPassword = Base64.decode(userPasswordBase64);
        console.log("userName="+userName+" userPassword="+userPassword);
        if(userName!=null && userPassword!=null){
            var oBtn = document.getElementById('btnUsrLogin');
            oBtn.onclick = function(){
                $("#txtUsrAccount").val(userName);
                $("#txtUsrPwd").val(userPassword);
                var name = $("#txtUsrAccount").val();
                var pwd = $("#txtUsrPwd").val();
//              alert("用户名="+name+" and 密码="+pwd);
            };
            setTimeout("oBtn.click()",1000);
              //模拟点击事件，页面刷新，出发点击事件
        }

java实现base64加密和解密方法

    //加密  
    public static String getBase64(String str){  
        byte[] b=null;  
        String s=null;  
        try {  
            b = str.getBytes("utf-8");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        if(b!=null){  
            s=new BASE64Encoder().encode(b);  
        }  
        return s;  
    }  

    // 解密    
    public static String getFromBase64(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;    
    }