分享微信小程序签到考勤后端代码

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服务端源码

鉴于很多小伙伴给我私信，询问关于后端代码的事。很开心很帮助到这么多人。但之前由于某种原因没能将其与客户端代码一并发布，这里将代码发布到GitHub上，让大家方便下载学习。这里用的是Java Servlet ，运行在 Web 服务器或应用服务器上的程序，作为来自 Web 浏览器或其他 HTTP 客户端的请求和 HTTP 服务器上的数据库或应用程序之间的中间层。数据库使用的是MySQL，持久层使用了JDBC，Java的原生API。没有使用框架，方便新手学习，也更能理解web的运行机制和原理。GitHub地址：传送门这里要说明一下关键的代码：

/**  * Servlet implementation class Login  */@WebServlet("/Login")public class Login extends HttpServlet { 	private static final long serialVersionUID = 1L; 	private static final String APPID="xxxxxxxxxx"; 	private static final String SECRET="xxxxxxxxxxxxxxxxxxxxxxxxxx";      /**      * Default constructor.       */     public Login() {         // TODO Auto-generated constructor stub     }  	/** 	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 	 */ 	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 		//ÉèÖÃÇëÇó±àÂë         request.setCharacterEncoding("utf-8");         response.setContentType("text/html;charset=utf-8");         /* ÉèÖÃÏìӦͷÔÊÐíajax¿çÓò·ÃÎÊ */         response.setHeader("Access-Control-Allow-Origin", "*");         /* ÐǺűíʾËùÓеÄÒìÓòÇëÇ󶼿ÉÒÔ½ÓÊÜ£¬ */         response.setHeader("Access-Control-Allow-Methods", "GET,POST");         String flag=request.getParameter("flag");      //   System.out.println(flag);         if("login".equals(flag)) {         	String code=request.getParameter("js_code");         	String url = "https://api.weixin.qq.com/sns/jscode2session?appid="+APPID+    				 "&secret="+SECRET+"&js_code="+ code +"&grant_type=authorization_code";         	JSONObject sjson=CommonUtil.httpsRequest(url, "GET", null);         	/*String openid="";         	String session_key="";         	if (sjson != null) { 				try { 					 openid = sjson.getString("openid"); 					 session_key=sjson.getString("session_key"); 				} catch (Exception e) { 					System.out.println("ÒµÎñ²Ù×÷ʧ°Ü"); 					e.printStackTrace(); 				} 			} else { 				System.out.println("codeÎÞЧ"); 			}         	System.out.println(session_key+"  "+openid);*/         	         	/*Map<String, Object> result = new HashMap<String, Object>();             result.put("res", "test");             result.put("msg", "ºǫ́ÒÑÊÕµ½");*/          //   String json = new Gson().toJson(sjson);            // System.out.println(json);         	Writer out=response.getWriter();         	out.write(sjson.toString());         	out.flush();         }         if("init".equals(flag)) {         	StudentDAO studentDAO=new StudentDAO();         	String userid=request.getParameter("userid");             boolean res=true;             try {     			res=studentDAO.findCheck(userid);     		} catch (Exception e) {     			e.printStackTrace();     		}             Map<String, Object> result = new HashMap<String, Object>();             result.put("res", res);             result.put("msg", "ºǫ́ÒÑÊÕµ½");             String json = new Gson().toJson(result);             //·µ»ØÖµ¸ø΢ÐÅС³ÌÐò             Writer out = response.getWriter();             out.write(json);             out.flush();         }         if("student".equals(flag)) {         	StudentDAO studentDAO=new StudentDAO();         	String userid=request.getParameter("userid");         	String studentName=request.getParameter("sname");         	String studentNum=request.getParameter("snum");         	Student student=new Student(userid, studentName, studentNum,new Date());         	try { 				int a=studentDAO.create(student); 				if(a!=0) { 					System.out.println("²åÈë³É¹¦"); 				} 			} catch (Exception e) { 				e.printStackTrace(); 			}         }         if("teacher".equals(flag)) {         	TeacherDAO teacherDAO=new TeacherDAO();         	String userid=request.getParameter("userid");         	String teacherName=request.getParameter("tname");         	String teacherID=request.getParameter("tnum");         	Teacher tea=new Teacher(userid, teacherID, teacherName,new Date());         	try { 				int a=teacherDAO.create(tea); 				if(a!=0) { 					System.out.println("²åÈë³É¹¦"); 				} 			} catch (Exception e) { 				e.printStackTrace(); 			}         }         if("guide".equals(flag)) {         	StudentDAO studentDAO=new StudentDAO();         	String userid=request.getParameter("userid");         	System.out.println(userid);             boolean res=true;             String state="";             try {     			res=studentDAO.findCheck(userid);     		} catch (Exception e) {     			e.printStackTrace();     		}             if(res) {             	state="student";             }             else{ 				TeacherDAO teacherDAO=new TeacherDAO(); 				try { 					res=teacherDAO.findCheck(userid); 				} catch (Exception e) { 					e.printStackTrace(); 				} 				if(res) { 		            	state="teacher"; 		         } 				else { 					state="none"; 				} 			}             String json = new Gson().toJson(state);             //·µ»ØÖµ¸ø΢ÐÅС³ÌÐò             Writer out = response.getWriter();             out.write(json);             out.flush();         }         if("myInfo".equals(flag)) {         	String userid=request.getParameter("userid");         	StudentDAO studentDAO=new StudentDAO();         	try { 				List<String> list=studentDAO.myInfo(userid); 				Map<String, String> result = new HashMap<String, String>(); 	            result.put("backName",list.get(0)); 	            result.put("backNum", list.get(1)); 	            String json = new Gson().toJson(result); 	            //·µ»ØÖµ¸ø΢ÐÅС³ÌÐò 	            Writer out = response.getWriter(); 	            out.write(json); 	            out.flush(); 			} catch (Exception e) { 				e.printStackTrace(); 			}         	         }          	}  	/** 	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 	 */ 	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 		// TODO Auto-generated method stub 		doGet(request, response); 	}}

这里的APPID和SECRET要使用你自己的。由于最近很少关注博客，咨询的人也很多，很多私信来不及回复，具体其它的就由大家自己探索喽。本程序纯属个人兴趣，切勿用于商业用途。

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