Veebirakendused Java baasil

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1 Veebirakendused Java baasil Märt Kalmo

2 Loeng 1 Servlet, korraldus, Java EE 2

3 Aine sisu Väga mahukas aine Veebirakendus Java-s on olemuselt sama mis Php-s või.net-is: päringust sisend, andmebaasist andmed, töötlus ja väljund. 3

4 4

5 Hello world! 5

6 Php print Hello world! 6

7 public class HelloServlet extends HttpServlet { private static final long serialversionuid = 1L; protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { } } response.getwriter().println("hello, world!"); 7

8 Url public class HelloServlet extends HttpServlet { private static final long serialversionuid = 1L; protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { } } response.getwriter().println("hello, world!"); 8

9 Server Jetty, Tomcat, Oracle WebLogic, etc 9

10 public class Hello extends HttpServlet { protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getparameter("name"); } } 10

11 Html väljund protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { } response.getwriter().print( "<form method='post' action='form'>" + " <input name='name' />" + " <input type='submit' />" + "</form>"); 11

12 Veebirakenduste arhitektuurist 12

13 Html-i genereerimine serveris 13

14 Html-i genereerimine kliendi pool 14

15 doget(), dopost(), public class Hello extends HttpServlet { protected void doget(... } protected void dopost(... } protected void dodelete(... } } 15

16 Http protokoll 16

17 Mis on protokoll? 17

18 Http GET päring > telnet 80 Trying 2001:bb8:4006:ff:193:40:194: Connected to quacko.itcollege.ee. Escape character is '^]'. GET /index.html HTTP/1.1 Host: HTTP/ OK Date: Sun, 23 Feb :41:22 GMT.. Content-Type: text/html <html><body>... </body></html> Connection closed by foreign host. 18

19 Postman tman/fhbjgbiflinjbdggehcddcbncdddomop? hl=en 19

20 Andmevahetus 20

21 Json JavaScript Object Notation { } "id" : 1, "title" : "Covert Json", "hidden" : false, "tags" : ["java", "json"] 21

22 Json <-> Java { } "id" : 1, "title" : "Covert Json", "hidden" : false, "tags" : ["java", "json"] public class Post { private Long id; private String title; private boolean hidden; private List<String> tags; 22

23 Json <-> Java build.gradle dependencies { compile 'com.fasterxml.jackson.core:jackson-databind:2.9.0' } compileonly 'javax.servlet:javax.servlet-api:3.1.0' 23

24 Json <-> Java Post post = new Post(); post.setid(1l); post.settitle("covert Json"); post.sethidden(false); post.settags(arrays.aslist("java", "json")); String json = new ObjectMapper().writeValueAsString(post); 24

25 Json <-> Java Post post = new ObjectMapper().readValue(json, Post.class); 25

26 Sisend ja väljund...hello?name=tiit&age=.. protected void doget(httpservletrequest request,... request.getparameter("name"); } response.getwriter().print("..."); 26

27 Sisend ja väljund...hello?name=tiit&age=.. protected void dopost(httpservletrequest request,... request.getparameter("name"); request.getinputstream(); } response.getwriter().print("..."); String input = Util.asString(request.getInputStream()); 27

28 Päise atribuudid public class Hello extends HttpServlet { protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { response.setcontenttype("application/vnd.ms-excel"); response.setheader("content-disposition", "attachment; filename=numbers.xls"); } response.getwriter().println("1\t2\t3\t=sum(a1:c1)");} 28

29 29

30 Päise atribuudid public class Hello extends HttpServlet { protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { response.setcontenttype("application/json"); } }... 30

31 Globaalsed tegevused 31

32 Listener-id ServletContextListener HttpSessionListener 32

33 ServletContextListener contextinitialized(servletcontextevent event) contextdestroyed(servletcontextevent event) 33

34 Vajaminev tarkvara Java 8+ Gradle IntelliJ IDEA (Community Edition on piisav) Lombok (IDEA plugin) Node Git 34

35 Korraldusest 35

36 Aine läbimiseks on vajalik Projekt (50%) Eksam (50%) 36

37 Projekt Veebirakendus õpitud tehnoloogiate baasil Individuaalne Esitamine 6 osas Maksimaalne: x 10 punkti Alguses lihtsamad ülesanded 37

38 Projekti keerukuse jaotus 38

39 39

40 Projekti esitamine Esitamine läbi BitBucket-i Repositoorium on privaatne Kõik osad lähevad samasse repositooriumi Esitatav commit märgistada (tag) Esitatud töö peab käivituma ja läbima testid Võimalus ise kontrollida 40

41 Projekti esitamine 41

42 Versioonihaldus ja koradmine ope.ee/ess/echo/presentation/9ec3e2d3-f c-adac-5bb18a0dcedb?ec=true alates 39. min 42

43 Projekt 43

44 Projekt 44

45 Projekt 45

46 Projekt Rõhk pole funktsionaalsusel Eesmärk on õppida Java tehnoloogiaid Tehnoloogiad, mida tüüpiline Java arendaja tundma peab. Töötav näidis on ette antud 46

47 Projekti hindamine Ülevaatamine on poolautomaatne Kopeerimisel peab allikale viitama BitBucket-i ajalugu on oluline 47

48 Eksam Eeltingimus: projekti 4 esimest osa esitatud Lävend 51% Toimub Moodles Teooria ja ülesanded Kooli arvutis Avatud programmid: brauser (Moodle, arendatav programm), IDE. Materjalid: üks kahepoolne A4 leht, projekti kood. 48

49 Projekti 1. osa (17. sept) 49

50 Projekti 2. osa (24. sept) 50

51 Andemete säilitamine public class CustomerStore { private static List<Customer> customers = new ArrayList<>(); public static void addcustomer(customer customer) { customers.add(customer); } } public Customer getcustomers(... public static void main(string[] args) { CustomerStore.addCustomer(new Customer()); } 51

52 Java EE 52

53 Java package hello; import java.io.ioexception; import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import public class HelloServlet extends HttpServlet { private static final long serialversionuid = 1L; protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { } } response.getwriter().println("hello!"); 53

54 Paigaldamine (deployment) Php lihtsalt kopi failid Java kindel paketi formaat 54

55 Java servlet (pakendamine) hello.war `-- WEB-INF/ -- classes/ `-- test `-- HelloServlet.class -- lib/ `-- web.xml 55

56 Miks nii range? Rakendus peab töötama erinevates keskkondades. 56

57 Seadistamine 57

58 Java EE Spetsifikatsioon Määrab millist funktsionaalsust nt. server peab toetama Palju erinevaid lühendeid (jpa, jdbc, jsr 303, jne) hello.war `-- WEB-INF/ -- classes/ `-- test `-- Hello.class -- lib/ `-- web.xml 58

59 Õppematerjalid Slaidid Loengute ja harjutustundide salvestused Ekraanivideod 59

60 Moodle 60

61 Eelmise aasta tulemus Läbivus umbes 70% 61

62 Aja planeerimine 62

63 Projekti keerukuse jaotus 63

64 TIOBE index 64

65 Eesmärk Aine viiega lõpetaja võiks Java programmeeriana tööle minna. 65

66 Tagasisidest Tehnoloogiaid oli liiga palju korraga. 66

67 Tagasisidest C# aines loovad tudengid semestri jooksul projekti enda ettenägemise järgi, mis on kooskõlastatud õppejõuga. 67

68 Tagasisidest Sai teada, kuidas ehitati asju varem ning kuidas neid tehakse nüüd. 68

69 Tagasisidest Väga palju konfigureerimist. 69

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