相關推薦：《小程式開發教學》
鑑於很多小夥伴給我私信，詢問關於後端程式碼的事。很開心很幫助這麼多人。但之前因為某些原因無法與客戶端程式碼一併發布，這裡將程式碼發佈到GitHub上，讓大家方便下載學習。這裡用的是Java Servlet ，運行在 Web 伺服器或應用伺服器上的程序，作為來自 Web 瀏覽器或其他 HTTP 用戶端的請求和 HTTP 伺服器上的資料庫或應用程式之間的中間層。資料庫使用的是MySQL，持久層使用了JDBC，Java的原生API。沒有使用框架，方便新手學習，也更能理解web的運作機制與原理。
GitHub位址：傳送門
這裡要說明一下關鍵的程式碼：
/**
* 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);
}}這裡的APPID和SECRET要使用你自己的。由於最近很少關注博客，諮詢的人也很多，很多私信來不及回复，具體其它的就由大家自己探索嘍。本程序純屬個人興趣，切勿用於商業用途。
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