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前端HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>AJAX base64加密通讯实例</title>
<script type="text/javascript" src="js/base64.js"></script>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
var base = new Base64();
function passWord() {
var val = $("#yw").val();
var result = base.encode(val);
$("#mw").val(result);
}
function send() {
var val = $("#mw").val();
if (val == "") {
alert("请将数据进行加密处理");
return;
}
$.ajax({
type : "post",
url : "Base64Servlet",
data : "pass=" + val,
success : function(data) {
$("span").html("后台解密:" + data);
}
});
}
</script>
</head>
<body>
原文
<br />
<textarea id="yw" rows="5" cols="50">Hello Word</textarea>
<br />
<button onclick="passWord()">进行BASE64加密</button>
密文
<br />
<textarea id="mw" rows="5" cols="50"></textarea>
<br />
<button onclick="send()">进行后台验证</button>
<br />
<hr />
<span style="color: red; font-size: 30px;"></span>
</body>
</html>用到的Base64.js
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(/\r\n/g,"\n");
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;
}
}Servlet 后台代码
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Base64Servlet")
public class Base64Servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("<h1>Hello </h1>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String data = request.getParameter("pass");
if(data == null || data.isEmpty()){
response.getWriter().write("Fail");
return;
}
//后台进行Base64解密操作
byte[] decode = java.util.Base64.getDecoder().decode(data.getBytes());
response.getWriter().write(new String(decode));
}
}运行流程图
![AJAX通讯加密[通俗易懂]](https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg)
![AJAX通讯加密[通俗易懂]](https://img-blog.csdn.net/20180914161419748)
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