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				仿google判斷用戶密碼強度
			
          
 			Posted on 2006-06-08 23:14 ☆藍色夢想☆ 閱讀(826) 評論(0)  編輯  收藏  所屬分類: Other 
			
			


		
          
		
          靈感來自GOOGLE--Gmail的注冊表單，這是結合XMLHTTP和servlet以及客戶端腳本Javascript來實現的一個給死板的表單程序增加親和力的一個小玩意。下午看到遂花了幾小時模仿著寫了一個。前端代碼均來自GMAIL的表單注冊那里，后段驗證密碼強度的servlet是自己做的，算法有待商戳不過效果算是出來了。
          ·[xml,jsp,servlet]仿google判斷用戶密碼強度

          先來看客戶端的JS代碼，命名文 ?gvUserReg.js
          程序代碼：
          //?this?code?powered?by?google
          var?agt?=?navigator.userAgent.toLowerCase();
          var?is_op?=?(agt.indexOf("opera")?!=?-1);
          var?is_ie?=?(agt.indexOf("msie")?!=?-1)?&&?document.all?&&?!is_op;
          var?is_ie5?=?(agt.indexOf("msie?5")?!=?-1)?&&?document.all?&&?!is_op;

          function?CreateXmlHttpReq(handler)?{
          ??var?xmlhttp?=?null;
          ??if?(is_ie)?{
          ????//?Guaranteed?to?be?ie5?or?ie6
          ????var?control?=?(is_ie5)???"Microsoft.XMLHTTP"?:?"Msxml2.XMLHTTP";
          ????try?{
          ??????xmlhttp?=?new?ActiveXObject(control);
          ??????xmlhttp.onreadystatechange?=?handler;
          ????}?catch?(ex)?{
          ??????//?TODO:?better?help?message
          ??????alert("You?need?to?enable?active?scripting?and?activeX?controls");??
          ????}
          ??}?else?{
          ????//?Mozilla
          ????xmlhttp?=?new?XMLHttpRequest();
          ????xmlhttp.onload?=?handler;
          ????xmlhttp.onerror?=?handler;
          ??}
          ??return?xmlhttp;
          }
          alert();
          //?XMLHttp?send?POST?request
          function?XmlHttpPOST(xmlhttp,?url,?data)?{
          ??try?{
          ????xmlhttp.open("POST",?url,?true);
          ????xmlhttp.setRequestHeader("Content-Type",?"application/x-www-form-urlencoded;?charset=UTF-8");
          ????xmlhttp.send(data);

          ??}?catch?(ex)?{
          ????//?do?nothing
          ??}
          }

          //?XMLHttp?send?GEt?request
          function?XmlHttpGET(xmlhttp,?url)?{
          ??try?{
          ????xmlhttp.open("GET",?url,?true); 
          ????xmlhttp.send(null);
          ??}?catch?(ex)?{
          ????//?do?nothing
          ??}
          }
          ?var?myxmlhttp;
          ??var?isBrowserCompatible;
          ??var?hidePasswordBar;
          ??ratingMsgs?=?new?Array(6);
          ??ratingMsgColors?=?new?Array(6);
          ??barColors?=?new?Array(6);
          ??ratingMsgs[0]?=?"未評級";
          ??ratingMsgs[1]?=?"太短";
          ??ratingMsgs[2]?=?"弱";
          ??ratingMsgs[3]?=?"一般";
          ??ratingMsgs[4]?=?"很好";
          ??ratingMsgs[5]?=?"極佳";?//If?the?password?server?is?down
          ??ratingMsgColors[0]?=?"#808080";
          ??ratingMsgColors[1]?=?"#da5301";
          ??ratingMsgColors[2]?=?"#ccbe00";
          ??ratingMsgColors[3]?=?"#1e91ce";
          ??ratingMsgColors[4]?=?"#0000FF";
          ??ratingMsgColors[5]?=?"#ff0000";
          ??barColors[0]?=?"#e0e0e0";
          ??barColors[1]?=?"#da5301";
          ??barColors[2]?=?"#f0e54b";
          ??barColors[3]?=?"#1e91ce";
          ??barColors[4]?=?"#0000FF";
          ??barColors[5]?=?"#ff0000";
          ??hidePasswordBar?=?false;
          ??function?CreateRateUserPassReq(formKey)?{
          ????if?(!isBrowserCompatible)?{
          ??????return;
          ????}
          ????var?passwd?=?document.forms[formKey].gvUserPass.value;
          var?min_passwd_len?=?6;
          ????var?passwdKey?=?"passwd";
          ????if?(passwd.length?<?min_passwd_len)?{
          ???? DrawBar(1);
          ????}else{
          ?? ??//We?need?to?escape?the?password?now?so?it?won't?mess?up?with?length?test
          ??????passwd?=?escape(passwd);
          ??????var?params?=?passwdKey?+?"="?+?passwd
          ??????myxmlhttp?=?CreateXmlHttpReq(RateUserPassXmlHttpHandler);
          ??????XmlHttpPOST(myxmlhttp,?"/club/rateUserPass.gv",?params);
          ????}
          ??}

          ??function?getElement(name)?{
          ????if?(document.all)?{
          ??????return?document.all(name);
          ????}
          ????return?document.getElementById(name);
          ??}

          ??function?RateUserPassXmlHttpHandler()?{
          ????//?Can't?check?status?since?safari?doesn't?support?it
          ????if?(myxmlhttp.readyState?!=4?)?{
          ??????return;
          ????}
          ????rating?=?parseInt(myxmlhttp.responseText);
          ????DrawBar(rating);
          ??}

          ??function?DrawBar(rating)?{
          ????var?posbar?=?getElement('posBar');
          ????var?negbar?=?getElement('negBar');
          ????var?passwdRating?=?getElement('passwdRating');
          ????var?barLength?=?getElement('passwdBarDiv').width;
          ????if?(rating?>=?0?&&?rating?<=?5)?{??//We?successfully?got?a?rating
          ??????posbar.style.width?=?barLength?/?5?*?rating;
          ??????negbar.style.width?=?barLength?/?5?*?(5?-?rating);
          ????}?else?{
          ??????posbar.style.width?=?0;
          ??????negbar.style.width?=?barLength;
          ??????rating?=?5;?//?Not?rated?Rating
          ????}
          ????posbar.style.background?=?barColors[rating]
          ????passwdRating.innerHTML?=?"<font?color='"?+?ratingMsgColors[rating]?+
          ?????????????????????????????"'>"?+?ratingMsgs[rating]?+?"</font>";
          ??}

          表單部分只是列出密碼選框部分
          程序代碼：

          要引入剛才那個JS文件
          <script?language="javascript"?src="gvUserReg.js"></script>
          <form?action="userRegPost.jsp"?method="post"??name="Gforms"?onSubmit="return?CheckForm();">
          <table?width="100%"??border="0"?cellpadding="0"?cellspacing="0">
          ????????<tr>
          ????????<td?width="100"><input?style="width:200?px"?onKeyUp="CreateRateUserPassReq('Gforms')"?name="gvUserPass"?type="password"?id="gvUserPass"?size="30"?maxlength="30"?/>????????????</td>
          ????????<td?width="10"></td><td>
          <TABLE??width="200"?border=0?cellPadding=0?cellSpacing=0?>
          <TBODY><TR><TD?vAlign=top?noWrap?width=0>
          <A?href="#">密碼強度：</A>?
          </TD>
          <TD><DIV??id="passwdRating">太短</DIV>
          </TD></TR><TR><TD?height=3></TD></TR>
          <TR><TD?colSpan=2>
          <TABLE??id="passwdBarDiv"?cellSpacing=0?cellPadding=0?width="200"??bgColor="#ffffff"?border=0>
          <TBODY><TR>
          <TD?id="posBar"?width="0%"?bgColor="#e0e0e0"?height="4"></TD>
          <TD?id="negBar"?width="100%"?bgColor="#e0e0e0"??height="4"></TD>
          </TR></TBODY>
          </TABLE>
          </TD></TR>
          </TBODY></TABLE> </td>
          ????</tr>
          ????</table>
          <script?language="javascript">
          <!--
          /*?Checks?Browser?Compatibility?*/
          //document.getElementById("passwdBarDiv").style.display?=?"block";
          var?agt?=?navigator.userAgent.toLowerCase();
          var?is_op?=?(agt.indexOf("opera")?!=?-1);
          var?is_ie?=?(agt.indexOf("msie")?!=?-1)?&&?document.all?&&?!is_op;
          var?is_mac?=?(agt.indexOf("mac")?!=?-1);
          var?is_gk?=?(agt.indexOf("gecko")?!=?-1);
          var?is_sf?=?(agt.indexOf("safari")?!=?-1);
          function?gff(str,?pfx)?{
          var?i?=?str.indexOf(pfx);
          if?(i?!=?-1)?{
          var?v?=?parseFloat(str.substring(i?+?pfx.length));
          if?(!isNaN(v))?{
          return?v;
          }
          }
          return?null;
          }
          function?Compatible()?{
          if?(is_ie?&&?!is_op?&&?!is_mac)?{
          var?v?=?gff(agt,?"msie?");
          if?(v?!=?null)?{
          return?(v?>=?6.0);
          }
          }
          if?(is_gk?&&?!is_sf)?{
          var?v?=?gff(agt,?"rv:");
          if?(v?!=?null)?{
          return?(v?>=?1.4);
          }else{
          v?=?gff(agt,?"galeon/");
          if?(v?!=?null)?{
          return?(v?>=?1.3);
          }
          }
          }
          if?(is_sf)?{
          var?v?=?gff(agt,?"applewebkit/");
          if?(v?!=?null)?{
          return?(v?>=?124);
          }
          }
          return?false;
          }
          ??/*?We?also?try?to?create?an?xmlhttp?object?to?see?if?the?browser?supports?it?*/
          myxmlhttp?=?CreateXmlHttpReq(RateUserPassXmlHttpHandler);
          isBrowserCompatible?=?Compatible()?&&?myxmlhttp;
          if?(!isBrowserCompatible?||?hidePasswordBar)?{
          document.getElementById("passwdBarDiv").style.display?=?"none";
          }
          //-->?
          </script>
          </form>

          Servlet部分，驗證密碼強度的JAVA類
          程序代碼：
          /*?
          ?*?2005-12-14
          ?*?Made?in?GamVan
          ?*/
          package?com.gamvan.club.servlet;

          import?java.io.IOException;
          import?java.io.PrintWriter;

          import?javax.servlet.ServletException;
          import?javax.servlet.http.HttpServlet;
          import?javax.servlet.http.HttpServletRequest;
          import?javax.servlet.http.HttpServletResponse;

          import?com.gamvan.tools.EncodeString;
          /**
          ?*?@author?GamVan?by?我容易么我
          ?*?Powered?by?GamVan.com
          ?*/
          public?class?RateUserPass?extends?HttpServlet?{
          private?static?final?long?serialVersionUID?=?1L;
          private?int?rate?=?0;

          /**
          ?*?口令強弱等級判定,強度算法有待商戳，功能基本實現
          ?*?@param?pass
          ?*?@return
          ?*?2005-12-14?16:55:03?Made?In?GamVan
          ?*?com.gamvan.club.servlet
          ?*/
          public?int?rateUserPass(String?pass){
          /*
          ?*?i?值指示口令等級
          ?*?0?不合法口令
          ?*?1?太短
          ?*?2?弱
          ?*?3?一般
          ?*?4?很好
          ?*?5?極佳
          ?*/
          int?i?=?0;
          if(pass==null?||?pass.length()==0){
          return?0;
          }
          int?hasLetter?=?EncodeString.matcherStr(pass,"[a-zA-Z]","").length();
          int?hasNumber?=?EncodeString.matcherStr(pass,"[0-9]","").length(); 
          int?passLen?=?pass.length();
          if(passLen>=6){
          /*?如果僅包含數字或僅包含字母?*/
          if((passLen-hasLetter)==0?||?(passLen-hasNumber)==0){
          if(passLen<8){
          i?=?2;
          }else?{
          i?=?3;
          }
          }
          /*?如果口令大于6位且即包含數字又包含字母?*/
          else?if(hasLetter>0?&&?hasNumber>0){?
          if(passLen>=10){
          i?=?5;
          }else?if(passLen>=8){
          i?=?4;
          }else{
          i?=?3;
          }
          }
          /*?如果既不包含數字又不包含字母?*/
          else?if(hasLetter==0?&&?hasNumber==0){
          if(passLen>=7){
          i?=?5;
          }else{
          i?=?4;
          }
          }
          /*?字母或數字有一方為0?*/
          else?if(hasNumber==0||hasLetter==0){
          if((passLen-hasLetter)==0?||?(passLen-hasNumber)==0){
          i?=?2;
          }
          /*?
          ?*?字母數字任意一種類型小于6且總長度大于等于6
          ?*?則說明此密碼是字母或數字加任意其他字符組合而成
          ?*/
          else{
          if(passLen>8){
          i?=?5;
          }else?if(passLen==8){
          i?=?4;
          }else{
          i?=?3;
          }
          }
          }
          }else{?//口令小于6位則顯示太短
          if(passLen>0){
          i?=?1;?//口令太短
          }else{
          i?=?0;
          }
          }
          return?i;
          }

          public?void?service(HttpServletRequest?request,HttpServletResponse?response)
          throws?ServletException,?IOException?
          {
          String?userPass?=?request.getParameter("passwd");
          rate?=?rateUserPass(userPass);
          response.setContentType("text/HTML;charset=UTF-8");?
          PrintWriter?out?=?response.getWriter();
          out.print(rate);
          out.close();
          if(true)return;
          return?;
          }

          }

          下面這個是強度驗證的servlet用到的一個正則表達式工具類，這里我只把我們這篇文章用到的其中一個方法貼出來給大家
          程序代碼：

          /*?
          ?*?Made?in?GamVan
          ?*/
          package?com.gamvan.tools;
          import?java.io.UnsupportedEncodingException;
          import?java.security.MessageDigest;
          import?sun.misc.BASE64Encoder;
          import?java.util.regex.*;
          import?com.gamvan.tools.MD5;
          /**
          ?*?字符串操作集合類
          ?*?@author?GamVan?by?我容易么我
          ?*?Powered?by?GamVan.com
          ?*/
          public?class?EncodeString{
          ????/**
          ?????*?循環找出匹配內容
          ?????*?@param?str
          ?????*?@param?cp
          ?????*?@param?s
          ?????*?@return
          ?????*?2005-12-11?18:45:25?Made?In?GamVan
          ?????*?com.gamvan.tools
          ?????*/
          ????public?static?String?matcherStr(String?str,?String?cp,?String?s){
          ????????if(str==null?||?str.equals("")){
          ????????????return?"";
          ????????}
          ????????String?txt?=?new?String();
          ????????txt?=?str;
          ????????if(str!=null?&&?!str.equals("")){
          ????????????txt?=?str;
          ????????????Pattern?p?=?Pattern.compile(cp,2);?//參數2表示大小寫不區分
          ????????????Matcher?m?=?p.matcher(txt);
          ????????????StringBuffer?sb?=?new?StringBuffer();
          ????????????int?i=0;
          ????????????boolean?result?=?m.find();
          ????????????//使用循環將句子里所有匹配的內容找出并替換再將內容加到sb里
          ????????????while(result)?{
          ????????????????i++;
          ????????????????sb.append(m.group());
          ????????????????sb.append(s);
          ????????????????//繼續查找下一個匹配對象
          ????????????????result?=?m.find();
          ????????????}
          ????????????txt?=?String.valueOf(sb);
          ????????}else{
          ????????????txt?=?"";
          ????????}
          ????????return?txt;???????
          ????}
          }
          地球人都知道servlet需要部署才能用我這里這個應用在web.xml是這么部署的！大家可以根據需要自己改。
          程序代碼：
          <servlet>
          <servlet-name>RateUserPass</servlet-name>
          <servlet-class>com.gamvan.club.servlet.RateUserPass</servlet-class>
          </servlet>
          <servlet-mapping>
          <servlet-name>RateUserPass</servlet-name>
          <url-pattern>/club/rateUserPass.gv</url-pattern>
          </servlet-mapping> 


          
	
          


          
	    
    




          








          

				
			
          
		          		
	
          
	
          
		
			

		
	
          

          


    







        
	




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