2017年12月13日(星期三)  农历:丁酉年十月廿六
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  • 实现手机扫描二维码进行登录

作者:三年。分类: JAVA

 实现手机扫描二维码进行登录

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

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

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

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

//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();

}

}

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();

}

}

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

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!!!");

*/

}

}

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

package cn.kuwo.vo;

import java.util.HashMap;

public class LoginUserVo {

private static HashMap loginUserMap = new HashMap();

private static LoginUserVo loginUserVo;

public static LoginUserVo getVo(){

if(loginUserVo == null){

loginUserVo = new LoginUserVo();

}

return loginUserVo;

}

public static HashMap getLoginUserMap() {

return loginUserMap;

}

}

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

用户名:

class="l_peoplecon">

密码:

class="l_mimacon">

登录

web.xml配置文件

xmlns=

xsi:schemaLocation

id="WebApp_ID" version="2.5">

QrCodeLoginPro

index.html

长连接检查登录状态

LongConnectionCheckServlet

cn.kuwo.LongConnectionCheckServlet

LongConnectionCheckServlet

/LongConnectionCheckServlet

获取二维码图片以及uuid

GetQrCodeServlet

GetQrCodeServlet

cn.kuwo.GetQrCodeServlet

GetQrCodeServlet

/GetQrCodeServlet

手机扫描二维码之后进行登录

PhoneLoginServlet

PhoneLoginServlet

cn.kuwo.PhoneLoginServlet

PhoneLoginServlet

/PhoneLoginServlet

此外还需要1个二维码开源包:QRCode.jar

温馨提示如有转载或引用以上内容之必要,敬请将本文链接作为出处标注,谢谢合作!

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