java和javascript之间通用的base64编解码

来源：互联网发布：吕梁广电网络客服电话编辑：程序博客网时间：2024/05/30 20:07

java代码：

/* * To change this template, choose Tools | Templates * and open the template in the editor. */package testapp.util.base64;import sun.misc.BASE64Decoder;public class Base64Util {    public static String getBASE64(String s) {        if (s == null) {            return null;        }        return (new sun.misc.BASE64Encoder()).encode(s.getBytes());    }    public static String getFromBASE64(String s) {        if (s == null) {            return null;        }        BASE64Decoder decoder = new BASE64Decoder();        try {            byte[] b = decoder.decodeBuffer(s);            return new String(b);        } catch (Exception e) {            return null;        }    }    public static void main(String[] args) {        String s = "这个是我们春节和元宵的照片";        String s1 = Base64Util.getBASE64(s);        System.out.println("s1:" + s1);        String s2 = Base64Util.getFromBASE64(s1);        System.out.println("s2:" + s2);    }}

javascript代码：

<script language=javascript>    var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";    var base64DecodeChars = new Array(        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,        -1,　0,　1,　2,　3, 4,　5,　6,　7,　8,　9, 10, 11, 12, 13, 14,    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,        -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);    function base64encode(str) {        var out, i, len;        var c1, c2, c3;        len = str.length;        i = 0;        out = "";        while(i < len) {            c1 = str.charCodeAt(i++) & 0xff;            if(i == len)            {                out += base64EncodeChars.charAt(c1 >> 2);                out += base64EncodeChars.charAt((c1 & 0x3) << 4);                out += "==";                break;            }            c2 = str.charCodeAt(i++);            if(i == len)            {                out += base64EncodeChars.charAt(c1 >> 2);                out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));                out += base64EncodeChars.charAt((c2 & 0xF) << 2);                out += "=";                break;            }            c3 = str.charCodeAt(i++);            out += base64EncodeChars.charAt(c1 >> 2);            out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));            out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));            out += base64EncodeChars.charAt(c3 & 0x3F);        }        return out;    }    function base64decode(str) {        var c1, c2, c3, c4;        var i, len, out;        len = str.length;        i = 0;        out = "";        while(i < len) {            /* c1 */            do {                c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];            } while(i < len && c1 == -1);            if(c1 == -1)                break;            /* c2 */            do {                c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];            } while(i < len && c2 == -1);            if(c2 == -1)                break;            out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));            /* c3 */            do {                c3 = str.charCodeAt(i++) & 0xff;                if(c3 == 61)                    return out;                c3 = base64DecodeChars[c3];            } while(i < len && c3 == -1);            if(c3 == -1)                break;            out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));            /* c4 */            do {                c4 = str.charCodeAt(i++) & 0xff;                if(c4 == 61)                    return out;                c4 = base64DecodeChars[c4];            } while(i < len && c4 == -1);            if(c4 == -1)                break;            out += String.fromCharCode(((c3 & 0x03) << 6) | c4);        }        return out;    }    function utf16to8(str) {        var out, i, len, c;        out = "";        len = str.length;        for(i = 0; i < len; i++) {            c = str.charCodeAt(i);            if ((c >= 0x0001) && (c <= 0x007F)) {                out += str.charAt(i);            } else if (c > 0x07FF) {                out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));                out += String.fromCharCode(0x80 | ((c >>　6) & 0x3F));                out += String.fromCharCode(0x80 | ((c >>　0) & 0x3F));            } else {                out += String.fromCharCode(0xC0 | ((c >>　6) & 0x1F));                out += String.fromCharCode(0x80 | ((c >>　0) & 0x3F));            }        }        return out;    }    function utf8to16(str) {        var out, i, len, c;        var char2, char3;        out = "";        len = str.length;        i = 0;        while(i < len) {            c = str.charCodeAt(i++);            switch(c >> 4)            {                case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:                                                // 0xxxxxxx                                                out += str.charAt(i-1);                                                break;                                            case 12: case 13:                                                    // 110x xxxx　 10xx xxxx                                                    char2 = str.charCodeAt(i++);                                                    out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));                                                    break;                                                case 14:                                                    // 1110 xxxx　10xx xxxx　10xx xxxx                                                    char2 = str.charCodeAt(i++);                                                    char3 = str.charCodeAt(i++);                                                    out += String.fromCharCode(((c & 0x0F) << 12) |                                                        ((char2 & 0x3F) << 6) |                                                        ((char3 & 0x3F) << 0));                                                    break;                                            }                                        }                                        return out;                                    }                                    function doit() {                                        var f = document.f                                        f.output.value = base64encode(utf16to8(f.source.value))                                        f.decode.value = utf8to16(base64decode(f.output.value))                                    }</script></HEAD><BODY>    <H1>Base64</H1>    <FORM NAME="f">        原码<BR>        <TEXTAREA NAME="source" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>        Base64 encode<BR>        <TEXTAREA NAME="output" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>        Base64 decode<BR>        <TEXTAREA NAME="decode" ROWS=4 COLS=60 WRAP="soft"></TEXTAREA><BR><BR>        <INPUT TYPE=BUTTON VALUE="转换" ONCLICK="doit()">    </FORM></BODY>