### [分享微信小程序签到考勤后端代码](https://www.prosaas.cn/article/16568)

**Published:** 2020-07-25T05:23:08

**Author:** 5201314

**Excerpt:** 相关推荐：《小程序开发教程》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…

相关推荐：《小程序开发教程》

## 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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**Tags:** github, http, Java, mysql, servlet, 并发, 微信小程序, 数据库

**Categories:** 后端开发

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