java实现手机扫描二维码进行登录

转自：http://www.daxueit.com/article/2581.html

项目结构：

实现流程：

pc端：

1:打开二维码登录网页index.html

2:index.html调用GetQrCodeServlet

3:GetQrCodeServlet干2件事

　　a:生成随机的uuid,是一个唯一标识，该标识贯穿整个流程

　　b:生成二维码图片，二维码信息：http://60.28.201.37:8380/QrCodeLoginPro/Login.html?uuid=" + uuid

4:index页面展示二维码

5:index页面调用LongConnectionCheckServlet进行长连接轮询操作，参数为uuid

6:LongConnectionCheckServlet只干1件事

　　a:拿到uuid后循环检查loginUserMap中uuid是否不为null。

7:如果为null则代表没有登录，index.html将继续进行轮询

　　ps: LongConnectionCheckServlet 一个长连接请求检测登录状态

　　　　loginUserMap 是一个静态的map结构的登录池，uuid为key , 登录信息为value

手机端：

1:扫描pc端的二维码

2:打开二维码中的网页 http://60.28.201.37:8380/QrCodeLoginPro/Login.html?uuid=" + uuid

3:登录，将uname upwd uuid 传递给登录程序PhoneLoginServlet

4:PhoneLoginServlet干2件事

　　a:检测登录

　　b:登录成功后将登录信息插入到loginUserMap中去，uuid为key

pc端：

　　1:继续轮询检测uuid中是否为null

　　2:登录后的uuid中就不为null了，此时LongConnectionCheckServlet停止循环，返回登录状态。

代码：

cn.kuwo下的3个servlet


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package cn.kuwo;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Date;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import cn.kuwo.util.TwoDimensionCode;

/**

 * 生成二维码图片以及uuid

 * @author zijuntang

 *

 */

public class GetQrCodeServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        doPost(request, response);

    }

    protected void doPost(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        PrintWriter out = response.getWriter();

        

        //生成唯一ID

        int uuid = (int) (Math.random() * 100000);

        //二维码内容

        String content = "http://60.28.201.37:8380/QrCodeLoginPro/Login.html?uuid=" + uuid;

        //生成二维码

        String imgName =  uuid + "_" + (int) (new Date().getTime() / 1000) + ".png";

        String imgPath = "/home/web/apache/htdocs/QrCodeLogin/" + imgName;

        TwoDimensionCode handler = new TwoDimensionCode();

        handler.encoderQRCode(content, imgPath, "png");

        

        //生成的图片访问地址

        String qrCodeImg = "http://60.28.201.37/QrCodeLogin/" + imgName;

        String jsonStr = "{\"uuid\":" + uuid + ",\"qrCodeImg\":\"" + qrCodeImg + "\"}";

        out.print(jsonStr);

        out.flush();

        out.close();

    }

}

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package cn.kuwo;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Date;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import cn.kuwo.vo.LoginUserVo;

import cn.kuwo.vo.UserVo;

/**

 * 用长连接，检查登录状态

 * @author zijuntang

 *

 */

public class LongConnectionCheckServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request, response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String uuid = request.getParameter("uuid");

        String jsonStr = "";

        System.out.println("in");

        System.out.println("uuid:" + uuid);

        long inTime = new Date().getTime();

        Boolean bool = true;

        while (bool) {

            try {

                Thread.sleep(1000);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

            //检测登录

            UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);

            System.out.println("userVo:" + userVo);

            if(userVo != null){

                bool = false;

                jsonStr = "{\"uname\":\""+userVo.getUname()+"\"}";

                LoginUserVo.getLoginUserMap().remove(uuid);

            }else{

                if(new Date().getTime() - inTime > 5000){

                    bool = false;

                }

            }

        }

        System.out.println("login ok : " + jsonStr);

        PrintWriter out = response.getWriter();

        out.print(jsonStr);

        out.flush();

        out.close();

    }

}

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package cn.kuwo;

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 cn.kuwo.vo.LoginUserVo;

import cn.kuwo.vo.UserVo;

/**

 * 二维码手机端登录

 * @author zijuntang

 *

 */

public class PhoneLoginServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public PhoneLoginServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request, response);

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String uuid = request.getParameter("uuid");

        String uname = request.getParameter("uname");

        String upwd = request.getParameter("upwd");

        System.out.println(uuid);

        System.out.println(uname);

        System.out.println(upwd);

        //TODO 验证登录

        boolean bool = true;

        if(bool){

            //将登陆信息存入map

            UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);

            if(userVo == null){

                userVo = new UserVo();

                userVo.setUname(uname);

                userVo.setUpwd(upwd);

                LoginUserVo.getLoginUserMap().put(uuid, userVo);

            }

        }

        PrintWriter out = response.getWriter();

        out.print(bool);

        out.flush();

        out.close();

    }

}

cn.kuwo.util包下的生成二维码的封装类


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package cn.kuwo.util; 

  

import java.awt.Color; 

import java.awt.Graphics2D; 

import java.awt.image.BufferedImage; 

import java.io.File; 

import java.io.IOException; 

import java.io.InputStream; 

import java.io.OutputStream; 

import javax.imageio.ImageIO; 

import jp.sourceforge.qrcode.QRCodeDecoder; 

import jp.sourceforge.qrcode.exception.DecodingFailedException; 

import com.swetake.util.Qrcode; 

  

public class TwoDimensionCode { 

      

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param imgPath 图片路径

     */

    public void encoderQRCode(String content, String imgPath) { 

        this.encoderQRCode(content, imgPath, "png", 7); 

    } 

      

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param output 输出流

     */

    public void encoderQRCode(String content, OutputStream output) { 

        this.encoderQRCode(content, output, "png", 7); 

    } 

      

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param imgPath 图片路径

     * @param imgType 图片类型

     */

    public void encoderQRCode(String content, String imgPath, String imgType) { 

        this.encoderQRCode(content, imgPath, imgType, 7); 

    } 

      

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param output 输出流

     * @param imgType 图片类型

     */

    public void encoderQRCode(String content, OutputStream output, String imgType) { 

        this.encoderQRCode(content, output, imgType, 7); 

    } 

  

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param imgPath 图片路径

     * @param imgType 图片类型

     * @param size 二维码尺寸

     */

    public void encoderQRCode(String content, String imgPath, String imgType, int size) { 

        try { 

            BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); 

              

            File imgFile = new File(imgPath);

            if (!imgFile.exists())

            {

                imgFile.mkdirs();

            }

            // 生成二维码QRCode图片 

            ImageIO.write(bufImg, imgType, imgFile); 

        } catch (Exception e) { 

            e.printStackTrace(); 

        } 

    } 

  

    /**

     * 生成二维码(QRCode)图片

     * @param content 存储内容

     * @param output 输出流

     * @param imgType 图片类型

     * @param size 二维码尺寸

     */

    public void encoderQRCode(String content, OutputStream output, String imgType, int size) { 

        try { 

            BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); 

            // 生成二维码QRCode图片 

            ImageIO.write(bufImg, imgType, output); 

        } catch (Exception e) { 

            e.printStackTrace(); 

        } 

    } 

      

    /**

     * 生成二维码(QRCode)图片的公共方法

     * @param content 存储内容

     * @param imgType 图片类型

     * @param size 二维码尺寸

     * @return

     */

    private BufferedImage qRCodeCommon(String content, String imgType, int size) { 

        BufferedImage bufImg = null; 

        try { 

            Qrcode qrcodeHandler = new Qrcode(); 

            // 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小 

            qrcodeHandler.setQrcodeErrorCorrect(‘M‘); 

            qrcodeHandler.setQrcodeEncodeMode(‘B‘); 

            // 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大 

            qrcodeHandler.setQrcodeVersion(size); 

            // 获得内容的字节数组，设置编码格式 

            byte[] contentBytes = content.getBytes("utf-8"); 

            // 图片尺寸 

            int imgSize = 67 + 12 * (size - 1); 

            bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB); 

            Graphics2D gs = bufImg.createGraphics(); 

            // 设置背景颜色 

            gs.setBackground(Color.WHITE); 

            gs.clearRect(0, 0, imgSize, imgSize); 

  

            // 设定图像颜色> BLACK 

            gs.setColor(Color.BLACK); 

            // 设置偏移量，不设置可能导致解析出错 

            int pixoff = 2; 

            // 输出内容> 二维码 

            if (contentBytes.length > 0 && contentBytes.length < 800) { 

                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes); 

                for (int i = 0; i < codeOut.length; i++) { 

                    for (int j = 0; j < codeOut.length; j++) { 

                        if (codeOut[j][i]) { 

                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3); 

                        } 

                    } 

                } 

            } else { 

                throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800]."); 

            } 

            gs.dispose(); 

            bufImg.flush(); 

        } catch (Exception e) { 

            e.printStackTrace(); 

        } 

        return bufImg; 

    } 

      

    /**

     * 解析二维码（QRCode）

     * @param imgPath 图片路径

     * @return

     */

    public String decoderQRCode(String imgPath) { 

        // QRCode 二维码图片的文件 

        File imageFile = new File(imgPath); 

        BufferedImage bufImg = null; 

        String content = null; 

        try { 

            bufImg = ImageIO.read(imageFile); 

            QRCodeDecoder decoder = new QRCodeDecoder(); 

            content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");  

        } catch (IOException e) { 

            System.out.println("Error: " + e.getMessage()); 

            e.printStackTrace(); 

        } catch (DecodingFailedException dfe) { 

            System.out.println("Error: " + dfe.getMessage()); 

            dfe.printStackTrace(); 

        } 

        return content; 

    } 

      

    /**

     * 解析二维码（QRCode）

     * @param input 输入流

     * @return

     */

    public String decoderQRCode(InputStream input) { 

        BufferedImage bufImg = null; 

        String content = null; 

        try { 

            bufImg = ImageIO.read(input); 

            QRCodeDecoder decoder = new QRCodeDecoder(); 

            content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");  

        } catch (IOException e) { 

            System.out.println("Error: " + e.getMessage()); 

            e.printStackTrace(); 

        } catch (DecodingFailedException dfe) { 

            System.out.println("Error: " + dfe.getMessage()); 

            dfe.printStackTrace(); 

        } 

        return content; 

    } 

  

    public static void main(String[] args) { 

        String imgPath = "D:/aaa/Michael_QRCode.png"; 

        String encoderContent = "http://60.28.201.37:8380/QrCodeLoginPro/Login.html"; 

        TwoDimensionCode handler = new TwoDimensionCode(); 

        handler.encoderQRCode(encoderContent, imgPath, "png");

        

        

        /*

        System.out.println("========encoder success"); 

        String decoderContent = handler.decoderQRCode(imgPath); 

        System.out.println("解析结果如下："); 

        System.out.println(decoderContent); 

        System.out.println("========decoder success!!!"); 

        */

    } 

}

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package cn.kuwo.util;

  

import java.awt.image.BufferedImage; 

import jp.sourceforge.qrcode.data.QRCodeImage; 

  

public class TwoDimensionCodeImage implements QRCodeImage { 

  

    BufferedImage bufImg; 

      

    public TwoDimensionCodeImage(BufferedImage bufImg) { 

        this.bufImg = bufImg; 

    } 

      

    @Override

    public int getHeight() { 

        return bufImg.getHeight(); 

    } 

  

    @Override

    public int getPixel(int x, int y) { 

        return bufImg.getRGB(x, y); 

    } 

  

    @Override

    public int getWidth() { 

        return bufImg.getWidth(); 

    } 

  

}

cn.kuwo.vo下的2个数据层


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package cn.kuwo.vo;

import java.util.HashMap;

public class LoginUserVo {

    private static HashMap<String, UserVo> loginUserMap = new HashMap<String, UserVo>();

    private static LoginUserVo loginUserVo;

    public static LoginUserVo getVo(){

        if(loginUserVo == null){

            loginUserVo = new LoginUserVo();

        }

        return loginUserVo;

    }

    public static HashMap<String, UserVo> getLoginUserMap() {

        return loginUserMap;

    }

}

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package cn.kuwo.vo;

public class UserVo {

    private String uname;

    private String upwd;

    public String getUname() {

        return uname;

    }

    public void setUname(String uname) {

        this.uname = uname;

    }

    public String getUpwd() {

        return upwd;

    }

    public void setUpwd(String upwd) {

        this.upwd = upwd;

    }

}

2个网页


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<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>

<body>

    <div id="divCon">

        <img src="" id="QrCodeImg" />

    </div>

</body>

<script type="text/javascript">

    $(document).ready(function() {

        var uuid;

        $.get("/QrCodeLoginPro/GetQrCodeServlet", function(data, status) {

            var obj = eval("(" + data + ")");

            //存储UUID

            uuid = obj.uuid;

            //显示二维码

            $("#QrCodeImg").attr("src", obj.qrCodeImg);

            //开始验证登录

            validateLogin();

        });

        function validateLogin(){

            $.get("/QrCodeLoginPro/LongConnectionCheckServlet?uuid=" + uuid , function(data, status) {

                if(data == ""){

                    validateLogin();

                }else{

                    var obj = eval("(" + data + ")");

                    alert("登录成功了:" + obj.uname);

                }

            });

        }

    });

</script>

</html>

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<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>Insert title here</title>

</head>

<style>

.l_m_l {

    float: left;

    font-size: 14px;

    padding: 5px 0 0 0;

    width: 330px;

    color: #414141;

}

.l_m_linput {

    height: 31px;

    position: relative;

    width: 300px;

    margin-bottom: 21px;

}

.l_m_linput span {

    float: left;

    width: 78px;

    text-align: right;

    line-height: 31px;

}

input {

    float: left;

    width: 195px;

    height: 24px;

    line-height: 24px;

    background: #f2f2f2;

    border: 1px solid #c4c4c4;

    padding: 2px 22px 2px 2px;

}

.l_mimacon {

    position: absolute;

    top: 6px;

    right: 6px;

    width: 15px;

    height: 17px;

    background: url(img/l_mimacon.png)

        no-repeat;

}

.l_peoplecon {

    position: absolute;

    top: 7px;

    right: 6px;

    width: 15px;

    height: 15px;

    background: url(img/l_peoplecon.png)

        no-repeat;

}

.l_m_lload a {

    display: block;

    width: 154px;

    height: 40px;

    background:

        url(img/l_loadingbtn.png)

        no-repeat;

    margin: 0 auto;

    line-height: 40px;

    text-align: center;

    font-size: 18px;

    color: #52340c;

    text-decoration: none;

}

</style>

<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>

<body style=" border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, ‘Bitstream Vera Sans Mono‘, ‘Courier New‘, Courier, monospace !important; font-size: 1em !important; min-height: inherit !important;">>

    <div style="margin-left: 100px;"><img src="img/logo.png" /></div>

    <div >

        <p class="l_m_linput">

            <span><font color="#fff">用户名：</font></span><input type="text" id="login_name" value="zijuntang"><em

                class="l_peoplecon"></em>

        </p>

        <p class="l_m_linput">

            <span><font color="#fff">密码：</font></span><input type="password" id="login_psw" value="tangzijun"><em

                class="l_mimacon"></em>

        </p>

        <div class="l_m_linput2"></div>

        <div class="l_m_lload">

            <a href="javascript:login();">登录</a>

        </div>

    </div>

</body>

<script type="text/javascript">

    //登录

    function login(){

        $.post("/QrCodeLoginPro/PhoneLoginServlet", {

            uuid : $.getUrlParam(‘uuid‘),

            uname:$("#login_name").val(),

            upwd:$("#login_psw").val()

        }, function(data, status) {

            if(data == ""){

                alert("登录失败");

            }else{

                alert("登录成功");

            }

        });

    }

    

    //获取网页参数

    (function($){

        $.getUrlParam = function(name){

            var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");

            var r = window.location.search.substr(1).match(reg);

            if (r!=null) return unescape(r[2]); return null;

        }

        })(jQuery);

</script>

</html>

web.xml配置文件


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<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    id="WebApp_ID" version="2.5">

    <display-name>QrCodeLoginPro</display-name>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

    </welcome-file-list>

    <servlet>

        <description></description>

        <display-name>长连接检查登录状态</display-name>

        <servlet-name>LongConnectionCheckServlet</servlet-name>

        <servlet-class>cn.kuwo.LongConnectionCheckServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>LongConnectionCheckServlet</servlet-name>

        <url-pattern>/LongConnectionCheckServlet</url-pattern>

    </servlet-mapping>

    <servlet>

        <description>获取二维码图片以及uuid</description>

        <display-name>GetQrCodeServlet</display-name>

        <servlet-name>GetQrCodeServlet</servlet-name>

        <servlet-class>cn.kuwo.GetQrCodeServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>GetQrCodeServlet</servlet-name>

        <url-pattern>/GetQrCodeServlet</url-pattern>

    </servlet-mapping>

    <servlet>

        <description>手机扫描二维码之后进行登录</description>

        <display-name>PhoneLoginServlet</display-name>

        <servlet-name>PhoneLoginServlet</servlet-name>

        <servlet-class>cn.kuwo.PhoneLoginServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>PhoneLoginServlet</servlet-name>

        <url-pattern>/PhoneLoginServlet</url-pattern>

    </servlet-mapping>

</web-app>

此外还需要1个二维码开源包：QRCode.jar

源码下载：http://files.cnblogs.com/zijun/%E4%BA%8C%E7%BB%B4%E7%A0%81%E7%99%BB%E5%BD%95%E4%BE%8B%E5%AD%90.rar

时间： 2024-08-01 22:24:45

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