Base64加密解密

jsp：需下载base64.js

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="base64.js"></script>
<script type="text/javascript">
  var b = new Base64();
  var str = b.encode("在");
  alert("base64 encode:" + str);
//解密
  str = b.decode(str);
  alert("base64 decode:" + str);
</script>
</head>
<body>

</body>
</html>

View Code

java：

import java.io.UnsupportedEncodingException;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


public class EncodeAndDecode {
    
    /**
     * 加密str
     * @param str
     * @return
     */
     public static String getBase64(String str) {  
            byte[] b = null;  
            String s = null; 
            try {  
                b = str.getBytes("utf-8"); 
                for(int i=0;i<b.length;i++){
                //    b[i]=(byte) (b[i]+1);
                //    System.out.print(b[i]);
                }
                //System.out.println();
            } catch (UnsupportedEncodingException e) {  
                e.printStackTrace();  
            }  
            if (b != null) {  
                s = new BASE64Encoder().encode(b);  
            }  
           // getFromBase64(s);
            return s;  
        }  
      
     /**
         * 加密s
         * @param str
         * @return
         */
        public static String getFromBase64(String s) {  
            byte[] b = null;  
            String result = null;  
            if (s != null) {  
                BASE64Decoder decoder = new BASE64Decoder();  
                try {  
                    b = decoder.decodeBuffer(s); 
                    for(int i=0;i<b.length;i++){
                    //    b[i]=(byte) (b[i]-1);
                    //    System.out.print(b[i]);
                    }
                    result = new String(b, "utf-8");
                 //  System.out.println(); 
                 //   System.out.println(result);
                } catch (Exception e) {  
                    e.printStackTrace();  
                }  
            }  
            return result;  
        }  
        
        public static void main(String[] args) {
            String base64 = getBase64("在");
            String fromBase64 = getFromBase64(base64);
            System.out.println(base64);
            System.out.println(fromBase64);
        }
}

View Code