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  • 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;
         330px;
        color: #414141;
    }
     
    .l_m_linput {
        height: 31px;
        position: relative;
         300px;
        margin-bottom: 21px;
    }
     
    .l_m_linput span {
        float: left;
         78px;
        text-align: right;
        line-height: 31px;
    }
     
    input {
        float: left;
         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;
         15px;
        height: 17px;
        background: url(img/l_mimacon.png)
            no-repeat;
    }
     
    .l_peoplecon {
        position: absolute;
        top: 7px;
        right: 6px;
         15px;
        height: 15px;
        background: url(img/l_peoplecon.png)
            no-repeat;
    }
     
    .l_m_lload a {
        display: block;
         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; 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：https://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
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  • 原文地址：https://www.cnblogs.com/nearpengju123/p/5185784.html
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