Grails框架+Intellij IDEA工具，写了一个对字符串进行转码，包括纯js转成Base64格式

1.Controller

def show(){
        System.err.println("进行转码....");
        String des = params.description;
        Base64Encoder encoder = new Base64Encoder();
        def s  = des.getBytes("utf-8").encodeBase64().toString();
        System.err.println("转码成功....，转换后"+s);
        [description:s];
    }

2.js

 <script type="text/javascript">
            function conversion(){
                var des = document.getElementById("des").value;
                var b  = new Base64();
                var test =b.encode(des);
                document.getElementById("show").innerText ="转码后的结果为："+ test;
            }
            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(/
/g,"
");
                    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;
                }
            }

        </script>

3.gsp：url的意思是提交到EncodeController这个控制器，调用show这个方法

 <div>
        <g:form url="[controller:'encode',action:'show']" name="ti">
              <g:textArea name="description" id="des"></g:textArea>
              <input value="encode" type="button" onclick="conversion()"/>
              <input type="submit" value="提交"/>
        </g:form>
        <span id="show"> </span>
    </div>

　　注：纯js转成base64是Copy过来的