仿web版微信，移动端扫描二维码登录web版本

论坛 › 期权论坛 › 脚本     
匿名技术用户   2020-12-22 13:43   11   0

首先，

1.PC端请求，生成一个唯一标识uuid，生成一个二维码，二维码的内容为移动端端的接口，参数为uuid

2.移动端获取uuid字段，将自己的用户名，密码请求到服务端的登录接口

3.讲移动端的请求，检测是否已登录，根据loginUserMap.get(uuid)是否为空，为空的话，登录，将登录信息put到loginUserMap中；不为空，显示已登录。

4.Java服务端一直请求，检测uuid是否为空。

5.uuid不为空了长连接停止循环，返回登录状态。


代码：

cn.kuwo下的3个servlet

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packagecn.kuwo;
 
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.Date;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importcn.kuwo.util.TwoDimensionCode;
 
/**
 * 生成二维码图片以及uuid
 * @author zijuntang
 *
 */
publicclass GetQrCodeServlet extendsHttpServlet {
    privatestatic final long serialVersionUID = 1L;
    protectedvoid doGet(HttpServletRequest request,
            HttpServletResponse response) throwsServletException, IOException {
        doPost(request, response);
    }
    protectedvoid doPost(HttpServletRequest request,
            HttpServletResponse response) throwsServletException, IOException {
        PrintWriter out = response.getWriter();
         
        //生成唯一ID
        intuuid = (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) (newDate().getTime() / 1000) + ".png";
        String imgPath = "/home/web/apache/htdocs/QrCodeLogin/"+ imgName;
        TwoDimensionCode handler = newTwoDimensionCode();
        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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packagecn.kuwo;
 
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.Date;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importcn.kuwo.vo.LoginUserVo;
importcn.kuwo.vo.UserVo;
 
/**
 * 用长连接，检查登录状态
 * @author zijuntang
 *
 */
publicclass LongConnectionCheckServlet extendsHttpServlet {
    privatestatic final long serialVersionUID = 1L;
    publicvoid doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {
        doPost(request, response);
    }
    publicvoid doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {
        String uuid = request.getParameter("uuid");
        String jsonStr = "";
        System.out.println("in");
        System.out.println("uuid:"+ uuid);
        longinTime = newDate().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(newDate().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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packagecn.kuwo;
 
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importcn.kuwo.vo.LoginUserVo;
importcn.kuwo.vo.UserVo;
 
/**
 * 二维码手机端登录
 * @author zijuntang
 *
 */
publicclass PhoneLoginServlet extendsHttpServlet {
    privatestatic final long serialVersionUID = 1L;
    publicPhoneLoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    protectedvoid doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {
        doPost(request, response);
    }
    protectedvoid doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, 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
        booleanbool = true;
        if(bool){
            //将登陆信息存入map
            UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);
            if(userVo == null){
                userVo = newUserVo();
                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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packagecn.kuwo.util; 
   
importjava.awt.Color; 
importjava.awt.Graphics2D; 
importjava.awt.image.BufferedImage; 
importjava.io.File; 
importjava.io.IOException; 
importjava.io.InputStream; 
importjava.io.OutputStream; 
importjavax.imageio.ImageIO; 
importjp.sourceforge.qrcode.QRCodeDecoder; 
importjp.sourceforge.qrcode.exception.DecodingFailedException; 
importcom.swetake.util.Qrcode; 
   
publicclass TwoDimensionCode { 
       
    /**
     * 生成二维码(QRCode)图片
     * @param content 存储内容
     * @param imgPath 图片路径
     */ 
    publicvoid 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
     */ 
    publicvoid 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
     */ 
    publicvoid 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
     */ 
    publicvoid 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
     */ 
    publicvoid encoderQRCode(String content, String imgPath, String imgType, intsize) { 
        try{ 
            BufferedImage bufImg = this.qRCodeCommon(content, imgType, size); 
               
            File imgFile = newFile(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
     */ 
    publicvoid encoderQRCode(String content, OutputStream output, String imgType, intsize) { 
        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
     */ 
    privateBufferedImage qRCodeCommon(String content, String imgType, intsize) { 
        BufferedImage bufImg = null; 
        try{ 
            Qrcode qrcodeHandler = newQrcode(); 
            // 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 
            intimgSize = 67+ 12* (size - 1); 
            bufImg = newBufferedImage(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 
            intpixoff = 2; 
            // 输出内容> 二维码 
            if(contentBytes.length > 0&& contentBytes.length < 800) { 
                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes); 
                for(inti = 0; i < codeOut.length; i++) { 
                    for(intj = 0; j < codeOut.length; j++) { 
                        if(codeOut[j][i]) { 
                            gs.fillRect(j * 3+ pixoff, i * 3+ pixoff, 3,3); 
                        } 
                    } 
                } 
            }else{ 
                thrownew Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800]."); 
            } 
            gs.dispose(); 
            bufImg.flush(); 
        }catch(Exception e) { 
            e.printStackTrace(); 
        } 
        returnbufImg; 
    } 
       
    /**
     * 解析二维码（QRCode）
     * @param imgPath 图片路径
     * @return
     */ 
    publicString decoderQRCode(String imgPath) { 
        // QRCode 二维码图片的文件 
        File imageFile = newFile(imgPath); 
        BufferedImage bufImg = null; 
        String content = null; 
        try{ 
            bufImg = ImageIO.read(imageFile); 
            QRCodeDecoder decoder = newQRCodeDecoder(); 
            content = newString(decoder.decode(newTwoDimensionCodeImage(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(); 
        } 
        returncontent; 
    } 
       
    /**
     * 解析二维码（QRCode）
     * @param input 输入流
     * @return
     */ 
    publicString decoderQRCode(InputStream input) { 
        BufferedImage bufImg = null; 
        String content = null; 
        try{ 
            bufImg = ImageIO.read(input); 
            QRCodeDecoder decoder = newQRCodeDecoder(); 
            content = newString(decoder.decode(newTwoDimensionCodeImage(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(); 
        } 
        returncontent; 
    } 
   
    publicstatic void main(String[] args) { 
        String imgPath = "D:/aaa/Michael_QRCode.png"; 
        String encoderContent = "http://60.28.201.37:8380/QrCodeLoginPro/Login.html"; 
        TwoDimensionCode handler = newTwoDimensionCode(); 
        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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packagecn.kuwo.util;
   
importjava.awt.image.BufferedImage; 
importjp.sourceforge.qrcode.data.QRCodeImage; 
   
publicclass TwoDimensionCodeImage implementsQRCodeImage { 
   
    BufferedImage bufImg; 
       
    publicTwoDimensionCodeImage(BufferedImage bufImg) { 
        this.bufImg = bufImg; 
    } 
       
    @Override 
    publicint getHeight() { 
        returnbufImg.getHeight(); 
    } 
   
    @Override 
    publicint getPixel(intx, inty) { 
        returnbufImg.getRGB(x, y); 
    } 
   
    @Override 
    publicint getWidth() { 
        returnbufImg.getWidth(); 
    } 
   
}

cn.kuwo.vo下的2个数据层

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packagecn.kuwo.vo;
 
importjava.util.HashMap;
 
publicclass LoginUserVo {
    privatestatic HashMap<String, UserVo> loginUserMap = newHashMap<String, UserVo>();
    privatestatic LoginUserVo loginUserVo;
    publicstatic LoginUserVo getVo(){
        if(loginUserVo == null){
            loginUserVo = newLoginUserVo();
        }
        returnloginUserVo;
    }
    publicstatic HashMap<String, UserVo> getLoginUserMap() {
        returnloginUserMap;
    }
}
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packagecn.kuwo.vo;
 
publicclass UserVo {
    privateString uname;
    privateString upwd;
    publicString getUname() {
        returnuname;
    }
    publicvoid setUname(String uname) {
        this.uname = uname;
    }
    publicString getUpwd() {
        returnupwd;
    }
    publicvoid 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 00 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:0auto;
    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="background-color: #333333">
    <div style="margin-left: 100px;"><img src="img/logo.png"/></div>
    <div >
        <pclass="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>
        <pclass="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>
        <divclass="l_m_linput2"></div>
        <divclass="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($){
        $.getUrlParam = function(name){
            var reg = newRegExp("(^|&)"+ name +"=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg);
            if(r!=null)returnunescape(r[2]);returnnull;
        }
        })(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/javaeehttp://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


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