利用JS使用Base64加密算法对密码进行加密传输到后台JAVA进行解密

1.需要jquery.base64.js文件，如需文件请私聊或者自己下载

2.JS代码

 <script type="text/javascript">
  /* 
 	 加密方法。没有过滤首尾空格，即没有trim.
  	加密可以加密N次，对应解密N次就可以获取明文
  */
  function encodeBase64(mingwen,times){  
	  var code="";  
	  var num=1;  
	  if(typeof times=='undefined'||times==null||times==""){   
	   		num=1;  
	   }else{    
	   		var vt=times+"";    
	   num=parseInt(vt);  
	   }  
	   if(typeof mingwen=='undefined'||mingwen==null||mingwen==""){  
	   
	   }else{    
	   		$.base64.utf8encode = true;    
	   		code=mingwen;    
	   		for(var i=0;i<num;i++){      
	   			code=$.base64.btoa(code);    
	   		}  
	   }  
   	return code;
   }
   //解密方法。没有过滤首尾空格，即没有trim
   //加密可以加密N次，对应解密N次就可以获取明文
   function decodeBase64(mi,times){  
	   var mingwen="";  
	   var num=1;  
	   if(typeof times=='undefined'||times==null||times==""){    
	   		num=1;  
	   }else{    
		   	var vt=times+"";    
		   	num=parseInt(vt);  
	  }  
	  		if(typeof mi=='undefined'||mi==null||mi==""){  
	  }else{    
	  		$.base64.utf8encode = true;    
			mingwen=mi;    
			for(var i=0;i<num;i++){      
			mingwen=$.base64.atob(mingwen);    
	  		}  
	  }  
  	return mingwen;
  }
</script>

3.JAVA解密工具类

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 
 * Base64加密--解密
 */
public class Base64Util {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String str = "suolong2014version";
		System.out.println("测试明文[" + str + "]");
		String basecode = Base64Util.encodeBase64(str);
		System.out.println("加密后[" + basecode + "]");

		if (basecode != null) {
			String res = Base64Util.decodeBase64(basecode);
			System.out.println("解密后[" + res + "]");
		}
		String str2 = "bGhiQDEyMzQ=";
		System.out.println(str2);
		if (str2 != null) {
			String res = Base64Util.decodeBase64(str2);
			System.out.println("解密后[" + res + "]");
		}
		// ///
		System.out.println("");
		System.out.println("N次加密测试--------");
		String basecodeN = Base64Util.encodeBase64(str, 2);
		String resN = Base64Util.decodeBase64(basecodeN, 2);
		String basecodeN3 = Base64Util.encodeBase64(str, 5);
		String resN3 = Base64Util.decodeBase64(basecodeN3, 5);
	}

	// 提供加密N次
	public static String encodeBase64(String mingwen, int times) {
		int num = (times <= 0) ? 1 : times;
		String code = "";
		if (mingwen == null || mingwen.equals("")) {
		} else {
			code = mingwen;
			for (int i = 0; i < num; i++) {
				code = encodeBase64(code);
			}
		}
		return code;
	}

	// 对应提供解密N次
	public static String decodeBase64(String mi, int times) {
		int num = (times <= 0) ? 1 : times;
		String mingwen = "";
		if (mi == null || mi.equals("")) {
		} else {
			mingwen = mi;
			for (int i = 0; i < num; i++) {
				mingwen = decodeBase64(mingwen);
			}
		}
		return mingwen;
	}

	// /
	public static String encodeBase64(String mingwen) {
		String code = "";
		if (mingwen == null || mingwen.equals("")) {
		} else {
			BASE64Encoder encoder = new BASE64Encoder();
			try {
				code = encoder.encode(mingwen.getBytes("UTF-8"));
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return code;
	}

	public static String decodeBase64(String mi) {
		String mingwen = "";
		if (mi == null || mi.equals("")) {
		} else {
			BASE64Decoder decoder = new BASE64Decoder();
			try {
				byte[] by = decoder.decodeBuffer(mi);
				mingwen = new String(by,"UTF-8");
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return mingwen;
	}
}

4.JS代码与java代码有了，我们实际中的用法是前端调用js代码

			//密码加密，加密后传到后台
			function pwdDecrypt(){
				var numTimes = 3;//加密次数与后台JAVA调用时对应
				var pwd = $.trim($("#password").val());
				var enResult = encodeBase64(pwd,numTimes); //加密 
				$("#password").val(enResult);
			}

后台调用java代码

/**
*user.getPassword()为后台传过来的加密密码
*3为次数与前端对应
*/
Base64Util.decodeBase64(user.getPassword(),3);//此行代码得到解密密码

5.得到解密后的密码就可以与数据库的比对了，或者在加密存到数据库，如有不懂与我交流，耐心解答！！！