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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
更多关于JavaScript相关内容感兴趣的读者可查看本站专题:《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》
希望本文所述对大家JavaScript程序设计有所帮助。
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