欧美bbbwbbbw肥妇,免费乱码人妻系列日韩,一级黄片

JS實(shí)現(xiàn)對(duì)中文字符串進(jìn)行utf-8的Base64編碼的方法(使其與Java編碼相同)

 更新時(shí)間:2016年06月21日 16:18:20   作者:yiluoAK_47  
這篇文章主要介紹了JS實(shí)現(xiàn)對(duì)中文字符串進(jìn)行utf-8的Base64編碼的方法,對(duì)比java的base64編碼程序,分析了javascript實(shí)現(xiàn)base64編碼的相關(guān)技巧,需要的朋友可以參考下

本文實(shí)例講述了JS實(shí)現(xiàn)對(duì)中文字符串進(jìn)行utf-8的Base64編碼的方法。分享給大家供大家參考,具體如下:

要進(jìn)行編碼的字符串:“select 用戶名 from 用戶”

使用JAVA進(jìn)行編碼,Java程序:

String sql = "select 用戶名 from 用戶";
String encodeStr = new String(Base64.encode(sql.getBytes("UTF-8"))); // 編碼
System.out.println(encodeStr);

得到:

c2VsZWN0IOeUqOaIt+WQjSBmcm9tIOeUqOaItw==

在Java中解碼:

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

Java代碼中為什么要使用getBytes("UTF-8")呢?因?yàn)閃indows和Linux環(huán)境下默認(rèn)編碼不同,要使你的程序在不同平臺(tái)下得到相同編碼,必然要指定編碼

雖然Html和JS的編碼都是utf-8,但JS從頁(yè)面上得到的中文編碼卻是utf-16,所以直接對(duì)中文進(jìn)行Base64編碼將得到錯(cuò)誤的結(jié)果,所以我們要先從utf-16轉(zhuǎn)到utf-8再編碼

<!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+/=";
//將Ansi編碼的字符串進(jìn)行Base64編碼
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;
}
//將Base64編碼字符串轉(zhuǎn)換成Ansi編碼的字符串
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;
}
// 測(cè)試代碼 開(kāi)始
var de = encode64(utf16to8("select 用戶名 from 用戶"));
document.writeln(de+"<br>");
var ee = utf8to16(decode64(de))
document.writeln(ee);
// 測(cè)試代碼 結(jié)束
//-->
</script>
</head>
<body>
</body>
</html>

上面的代碼都是從網(wǎng)上得來(lái),拼湊后得到正確結(jié)果,在此感謝前輩們

PS:這里再為大家推薦幾款base64編碼解碼在線工具,相信在以后的開(kāi)發(fā)中會(huì)用得到:

BASE64編碼解碼工具:
http://tools.jb51.net/transcoding/base64

在線圖片轉(zhuǎn)換BASE64工具:
http://tools.jb51.net/transcoding/img2base64

更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專(zhuān)題:《JavaScript切換特效與技巧總結(jié)》、《JavaScript查找算法技巧總結(jié)》、《JavaScript動(dòng)畫(huà)特效與技巧匯總》、《JavaScript錯(cuò)誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)

希望本文所述對(duì)大家JavaScript程序設(shè)計(jì)有所幫助。

相關(guān)文章

最新評(píng)論