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    jquery實現(xiàn)無刷新驗證碼的簡單實例
    來源:易賢網(wǎng) 閱讀:1351 次 日期:2016-06-27 11:46:30
    溫馨提示:易賢網(wǎng)小編為您整理了“jquery實現(xiàn)無刷新驗證碼的簡單實例”,方便廣大網(wǎng)友查閱!

    下面小編就為大家?guī)硪黄猨query實現(xiàn)無刷新驗證碼的簡單實例。小編覺得挺不錯的,現(xiàn)在分享給大家,也給大家做個參考。

    1. 思路:

    頁面上的驗證碼圖片是servlet,采用jquery實現(xiàn)異步校驗信息

    2. 所用到的文件

    VerifyCodeServlet.java   --用于生成圖片的servlet

    ResultServlet.java  --用于校驗驗證碼正確性的servlet

    verifyCode.js  --校驗的js文件

    jquery.js  --jquery包里的源文件

    verifyCode.jsp  --頁面

    3. 代碼

    VerifyCodeServlet.java

    Java代碼

    import java.awt.Color;  

    import java.awt.Font;  

    import java.awt.Graphics2D;  

    import java.awt.image.BufferedImage;  

    import java.util.Random;  

    import javax.imageio.ImageIO;  

    import javax.servlet.ServletException;  

    import javax.servlet.ServletOutputStream;  

    import javax.servlet.http.HttpServlet;  

    import javax.servlet.http.HttpServletRequest;  

    import javax.servlet.http.HttpServletResponse;  

    import javax.servlet.http.HttpSession;  

    public class VerifyCodeServlet extends HttpServlet {  

      // 驗證碼圖片的寬度。  

      private int width = 60;  

      // 驗證碼圖片的高度。  

      private int height = 20;  

      // 驗證碼字符個數(shù)  

      private int codeCount = 4;  

      private int x = 0;  

      // 字體高度  

      private int fontHeight;  

      private int codeY;  

      char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',  

          'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',  

          'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };  

      /**  

       * 初始化驗證圖片屬性  

       */ 

      public void init() throws ServletException {  

        // 從web.xml中獲取初始信息  

        // 寬度  

        String strWidth = this.getInitParameter("width");  

        // 高度  

        String strHeight = this.getInitParameter("height");  

        // 字符個數(shù)  

        String strCodeCount = this.getInitParameter("codeCount");  

        // 將配置的信息轉(zhuǎn)換成數(shù)值  

        try {  

          if (strWidth != null && strWidth.length() != 0) {  

            width = Integer.parseInt(strWidth);  

          }  

          if (strHeight != null && strHeight.length() != 0) {  

            height = Integer.parseInt(strHeight);  

          }  

          if (strCodeCount != null && strCodeCount.length() != 0) {  

            codeCount = Integer.parseInt(strCodeCount);  

          }  

        } catch (NumberFormatException e) {  

        }  

        x = width / (codeCount + 1);  

        fontHeight = height - 2;  

        codeY = height - 4;  

      }  

      protected void service(HttpServletRequest req, HttpServletResponse resp)  

          throws ServletException, java.io.IOException {  

        // 定義圖像buffer  

        BufferedImage buffImg = new BufferedImage(width, height,  

            BufferedImage.TYPE_INT_RGB);  

        Graphics2D g = buffImg.createGraphics();  

        // 創(chuàng)建一個隨機數(shù)生成器類  

        Random random = new Random();  

        // 將圖像填充為白色  

        g.setColor(Color.WHITE);  

        g.fillRect(0, 0, width, height);  

        // 創(chuàng)建字體,字體的大小應(yīng)該根據(jù)圖片的高度來定。  

        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);  

        // 設(shè)置字體。  

        g.setFont(font);  

        // 畫邊框。  

        g.setColor(Color.BLACK);  

        g.drawRect(0, 0, width - 1, height - 1);  

        // 隨機產(chǎn)生160條干擾線,使圖象中的認證碼不易被其它程序探測到。  

        g.setColor(Color.BLACK);  

        for (int i = 0; i < 160; i++) {  

          int x = random.nextInt(width);  

          int y = random.nextInt(height);  

          int xl = random.nextInt(12);  

          int yl = random.nextInt(12);  

          g.drawLine(x, y, x + xl, y + yl);  

        }  

        // randomCode用于保存隨機產(chǎn)生的驗證碼,以便用戶登錄后進行驗證。  

        StringBuffer randomCode = new StringBuffer();  

        int red = 0, green = 0, blue = 0;  

        // 隨機產(chǎn)生codeCount數(shù)字的驗證碼。  

        for (int i = 0; i < codeCount; i++) {  

          // 得到隨機產(chǎn)生的驗證碼數(shù)字。  

          String strRand = String.valueOf(codeSequence[random.nextInt(36)]);  

          // 產(chǎn)生隨機的顏色分量來構(gòu)造顏色值,這樣輸出的每位數(shù)字的顏色值都將不同。  

          red = random.nextInt(255);  

          green = random.nextInt(255);  

          blue = random.nextInt(255);  

          // 用隨機產(chǎn)生的顏色將驗證碼繪制到圖像中。  

          g.setColor(new Color(red, green, blue));  

          g.drawString(strRand, (i + 1) * x, codeY);  

          // 將產(chǎn)生的四個隨機數(shù)組合在一起。  

          randomCode.append(strRand);  

        }  

        // 將四位數(shù)字的驗證碼保存到Session中。  

        HttpSession session = req.getSession();  

        session.setAttribute("validateCode", randomCode.toString());  

        // 禁止圖像緩存。  

        resp.setHeader("Pragma", "no-cache");  

        resp.setHeader("Cache-Control", "no-cache");  

        resp.setDateHeader("Expires", 0);  

        resp.setContentType("image/jpeg");  

        // 將圖像輸出到Servlet輸出流中。  

        ServletOutputStream sos = resp.getOutputStream();  

        ImageIO.write(buffImg, "jpeg", sos);  

        sos.close();  

      }  

    import java.awt.Color;

    import java.awt.Font;

    import java.awt.Graphics2D;

    import java.awt.image.BufferedImage;

    import java.util.Random;

    import javax.imageio.ImageIO;

    import javax.servlet.ServletException;

    import javax.servlet.ServletOutputStream;

    import javax.servlet.http.HttpServlet;

    import javax.servlet.http.HttpServletRequest;

    import javax.servlet.http.HttpServletResponse;

    import javax.servlet.http.HttpSession;

    public class VerifyCodeServlet extends HttpServlet {

     // 驗證碼圖片的寬度。

     private int width = 60;

     // 驗證碼圖片的高度。

     private int height = 20;

     // 驗證碼字符個數(shù)

     private int codeCount = 4;

     private int x = 0;

     // 字體高度

     private int fontHeight;

     private int codeY;

     char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',

      'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',

      'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

     /**

     * 初始化驗證圖片屬性

     */

     public void init() throws ServletException {

     // 從web.xml中獲取初始信息

     // 寬度

     String strWidth = this.getInitParameter("width");

     // 高度

     String strHeight = this.getInitParameter("height");

     // 字符個數(shù)

     String strCodeCount = this.getInitParameter("codeCount");

     // 將配置的信息轉(zhuǎn)換成數(shù)值

     try {

      if (strWidth != null && strWidth.length() != 0) {

      width = Integer.parseInt(strWidth);

      }

      if (strHeight != null && strHeight.length() != 0) {

      height = Integer.parseInt(strHeight);

      }

      if (strCodeCount != null && strCodeCount.length() != 0) {

      codeCount = Integer.parseInt(strCodeCount);

      }

     } catch (NumberFormatException e) {

     }

     x = width / (codeCount + 1);

     fontHeight = height - 2;

     codeY = height - 4;

     }

     protected void service(HttpServletRequest req, HttpServletResponse resp)

      throws ServletException, java.io.IOException {

     // 定義圖像buffer

     BufferedImage buffImg = new BufferedImage(width, height,

      BufferedImage.TYPE_INT_RGB);

     Graphics2D g = buffImg.createGraphics();

     // 創(chuàng)建一個隨機數(shù)生成器類

     Random random = new Random();

     // 將圖像填充為白色

     g.setColor(Color.WHITE);

     g.fillRect(0, 0, width, height);

     // 創(chuàng)建字體,字體的大小應(yīng)該根據(jù)圖片的高度來定。

     Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);

     // 設(shè)置字體。

     g.setFont(font);

     // 畫邊框。

     g.setColor(Color.BLACK);

     g.drawRect(0, 0, width - 1, height - 1);

     // 隨機產(chǎn)生160條干擾線,使圖象中的認證碼不易被其它程序探測到。

     g.setColor(Color.BLACK);

     for (int i = 0; i < 160; i++) {

      int x = random.nextInt(width);

      int y = random.nextInt(height);

      int xl = random.nextInt(12);

      int yl = random.nextInt(12);

      g.drawLine(x, y, x + xl, y + yl);

     }

     // randomCode用于保存隨機產(chǎn)生的驗證碼,以便用戶登錄后進行驗證。

     StringBuffer randomCode = new StringBuffer();

     int red = 0, green = 0, blue = 0;

     // 隨機產(chǎn)生codeCount數(shù)字的驗證碼。

     for (int i = 0; i < codeCount; i++) {

      // 得到隨機產(chǎn)生的驗證碼數(shù)字。

      String strRand = String.valueOf(codeSequence[random.nextInt(36)]);

      // 產(chǎn)生隨機的顏色分量來構(gòu)造顏色值,這樣輸出的每位數(shù)字的顏色值都將不同。

      red = random.nextInt(255);

      green = random.nextInt(255);

      blue = random.nextInt(255);

      // 用隨機產(chǎn)生的顏色將驗證碼繪制到圖像中。

      g.setColor(new Color(red, green, blue));

      g.drawString(strRand, (i + 1) * x, codeY);

      // 將產(chǎn)生的四個隨機數(shù)組合在一起。

      randomCode.append(strRand);

     }

     // 將四位數(shù)字的驗證碼保存到Session中。

     HttpSession session = req.getSession();

     session.setAttribute("validateCode", randomCode.toString());

     // 禁止圖像緩存。

     resp.setHeader("Pragma", "no-cache");

     resp.setHeader("Cache-Control", "no-cache");

     resp.setDateHeader("Expires", 0);

     resp.setContentType("image/jpeg");

     // 將圖像輸出到Servlet輸出流中。

     ServletOutputStream sos = resp.getOutputStream();

     ImageIO.write(buffImg, "jpeg", sos);

     sos.close();

     }

    }

    ResultServlet.java

    Java代碼 

    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;  

    public class ResultServlet extends HttpServlet {  

      /**  

       * The doGet method of the servlet. <br>  

       *  

       * This method is called when a form has its tag value method equals to get.  

       *  

       * @param request the request send by the client to the server  

       * @param response the response send by the server to the client  

       * @throws ServletException if an error occurred  

       * @throws IOException if an error occurred  

       */ 

      public void doGet(HttpServletRequest request, HttpServletResponse response)  

          throws ServletException, IOException {  

        doPost(request, response);  

      }  

      /**  

       * The doPost method of the servlet. <br>  

       *  

       * This method is called when a form has its tag value method equals to post.  

       *  

       * @param request the request send by the client to the server  

       * @param response the response send by the server to the client  

       * @throws ServletException if an error occurred  

       * @throws IOException if an error occurred  

       */ 

      public void doPost(HttpServletRequest request, HttpServletResponse response)  

          throws ServletException, IOException {  

        response.setContentType("text/html;charset=utf-8");  

        String validateC = (String) request.getSession().getAttribute("validateCode");  

        String veryCode = request.getParameter("c");  

        PrintWriter out = response.getWriter();  

        if(veryCode==null||"".equals(veryCode)){  

          out.println("驗證碼為空");  

        }else{  

          if(validateC.equals(veryCode)){  

            out.println("驗證碼正確");  

          }else{  

            out.println("驗證碼錯誤");  

          }  

        }  

        out.flush();  

        out.close();  

      }  

    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;

    public class ResultServlet extends HttpServlet {

     /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     * 

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

     public void doGet(HttpServletRequest request, HttpServletResponse response)

      throws ServletException, IOException {

     doPost(request, response);

     }

     /**

     * The doPost method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to post.

     * 

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

     public void doPost(HttpServletRequest request, HttpServletResponse response)

      throws ServletException, IOException {

     response.setContentType("text/html;charset=utf-8");

     String validateC = (String) request.getSession().getAttribute("validateCode");

     String veryCode = request.getParameter("c");

     PrintWriter out = response.getWriter();

     if(veryCode==null||"".equals(veryCode)){

      out.println("驗證碼為空");

     }else{

      if(validateC.equals(veryCode)){

      out.println("驗證碼正確");

      }else{

      out.println("驗證碼錯誤");

      }

     }

     out.flush();

     out.close();

     }

    }

    verifyCode.js

    Js代碼

    function changeImg(){  

      var imgSrc = $("#imgObj");  

      var src = imgSrc.attr("src");  

      imgSrc.attr("src",chgUrl(src));  

    }  

    //時間戳  

    //為了使每次生成圖片不一致,即不讓瀏覽器讀緩存,所以需要加上時間戳  

    function chgUrl(url){  

      var timestamp = (new Date()).valueOf();  

      url = url.substring(0,17);  

      if((url.indexOf("&")>=0)){  

        url = url + "×tamp=" + timestamp;  

      }else{  

        url = url + "?timestamp=" + timestamp;  

      }  

      return url;  

    }  

    function isRightCode(){  

      var code = $("#veryCode").attr("value");  

      code = "c=" + code;  

      $.ajax({  

        type:"POST",  

        url:"resultServlet",  

        data:code,  

        success:callback  

      });  

    }  

    function callback(data){  

      $("#info").html(data);  

    function changeImg(){

     var imgSrc = $("#imgObj");

     var src = imgSrc.attr("src");

     imgSrc.attr("src",chgUrl(src));

    }

    //時間戳

    //為了使每次生成圖片不一致,即不讓瀏覽器讀緩存,所以需要加上時間戳

    function chgUrl(url){

     var timestamp = (new Date()).valueOf();

     url = url.substring(0,17);

     if((url.indexOf("&")>=0)){

     url = url + "×tamp=" + timestamp;

     }else{

     url = url + "?timestamp=" + timestamp;

     }

     return url;

    }

    function isRightCode(){

     var code = $("#veryCode").attr("value");

     code = "c=" + code;

     $.ajax({

     type:"POST",

     url:"resultServlet",

     data:code,

     success:callback

     });

    }

    function callback(data){

     $("#info").html(data);

    }

    verifyCode.jsp

    Html代碼

    <%@ 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">  

        <script type="text/javascript" src="js/verifyCode.js"></script>  

        <script type="text/javascript" src="js/jquery.js"></script>  

        <title>test verify code</title>  

      </head>  

      <body>  

        <input id="veryCode" name="veryCode" type="text"/>  

        <img id="imgObj" alt="" src="verifyCodeServlet"/>  

        <a href="#" onclick="changeImg()">換一張</a>  

        <input type="button" value="驗證" onclick="isRightCode()"/>  

        <div id="info"></div>  

      </body>  

    </html> 

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