JS实现对中文字符串进行utf-8的Base64编码的方法(使其与Java编码相同)

本文实例讲述了JS实现对中文字符串进行utf-8的Base64编码的方法。分享给大家供大家参考,具体如下:

要进行编码的字符串:“select 用户名 from 用户”

使用JAVA进行编码,Java程序:

String sql = "select 用户名 from 用户";

String encodeStr = new String(Base64.encode(sql.getBytes("UTF-8"))); // 编码

System.out.println(encodeStr);

得到:

c2VsZWN0IOeUqOaIt+WQjSBmcm9tIOeUqOaItw==

在Java中解码:

sql = new String(Base64.decode(sql.getBytes()), "UTF-8");

Java代码中为什么要使用getBytes("UTF-8")呢?因为Windows和Linux环境下默认编码不同,要使你的程序在不同平台下得到相同编码,必然要指定编码

虽然Html和JS的编码都是utf-8,但JS从页面上得到的中文编码却是utf-16,所以直接对中文进行Base64编码将得到错误的结果,所以我们要先从utf-16转到utf-8再编码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<title></title>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<style type="text/css">

<!--

body{

margin:0px;

padding:0px;

}

body,td{

font-size:9pt;

}

-->

</style>

<script type="text/JavaScript">

<!--

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

//将Ansi编码的字符串进行Base64编码

function encode64(input) {

var output = "";

var chr1, chr2, chr3 = "";

var enc1, enc2, enc3, enc4 = "";

var i = 0;

do {

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);

chr1 = chr2 = chr3 = "";

enc1 = enc2 = enc3 = enc4 = "";

} while (i < input.length);

return output;

}

//将Base64编码字符串转换成Ansi编码的字符串

function decode64(input) {

var output = "";

var chr1, chr2, chr3 = "";

var enc1, enc2, enc3, enc4 = "";

var i = 0;

if (input.length % 4 != 0) {

return "";

}

var base64test = /[^A-Za-z0-9\+\/\=]/g;

if (base64test.exec(input)) {

return "";

}

do {

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 += String.fromCharCode(chr2);

}

if (enc4 != 64) {

output += String.fromCharCode(chr3);

}

chr1 = chr2 = chr3 = "";

enc1 = enc2 = enc3 = enc4 = "";

} while (i < input.length);

return output;

}

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;

}

// 测试代码 开始

var de = encode64(utf16to8("select 用户名 from 用户"));

document.writeln(de+"<br>");

var ee = utf8to16(decode64(de))

document.writeln(ee);

// 测试代码 结束

//-->

</script>

</head>

<body>

</body>

</html>

上面的代码都是从网上得来,拼凑后得到正确结果,在此感谢前辈们

PS:这里再为大家推荐几款base64编码解码在线工具,相信在以后的开发中会用得到:

BASE64编码解码工具:

http://tools.jb51.net/transcoding/base64

在线图片转换BASE64工具:

http://tools.jb51.net/transcoding/img2base64

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希望本文所述对大家JavaScript程序设计有所帮助。

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