java实现手机扫描二维码进行登录
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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 //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 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 |
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