WEBVTT 1 00:00:00.500 --> 00:00:01.590 Hey, in this video, 2 00:00:01.590 --> 00:00:04.340 I'm going to give you an overview of the Spring Framework. 3 00:00:06.700 --> 00:00:09.990 So, first off, here's the official website for Spring. 4 00:00:09.990 --> 00:00:12.020 It's at www.spring.io. 5 00:00:12.020 --> 00:00:13.010 So, this is where you can get 6 00:00:13.010 --> 00:00:14.730 all the documentation for Spring, 7 00:00:14.730 --> 00:00:17.710 you can download Spring, you can look at some tutorials 8 00:00:17.710 --> 00:00:20.020 and also some getting started guides, 9 00:00:20.020 --> 00:00:23.033 and we'll use this website a lot during this course. 10 00:00:25.597 --> 00:00:27.290 So, why Spring? 11 00:00:27.290 --> 00:00:30.330 And I covered this in the last video, but again, 12 00:00:30.330 --> 00:00:33.940 in a nutshell, it's to simplify Java Enterprise Development, 13 00:00:33.940 --> 00:00:36.100 make it much simpler than what we had 14 00:00:36.100 --> 00:00:38.240 in J2EE or Java EE, 15 00:00:38.240 --> 00:00:39.923 and I gave all the pros and cons for that 16 00:00:39.923 --> 00:00:41.823 in the previous video. 17 00:00:42.800 --> 00:00:44.470 So, here, let's kind of drill down a bit 18 00:00:44.470 --> 00:00:47.590 and talk about the goals of Spring, like what are the goals. 19 00:00:47.590 --> 00:00:51.047 Well, first off, lightweight development with Java POJOs, 20 00:00:51.047 --> 00:00:53.940 and POJOs mean Plain Old Java Objects, 21 00:00:53.940 --> 00:00:55.500 make it much simpler to build, 22 00:00:55.500 --> 00:00:57.487 as compared to the heavyweight EJBs 23 00:00:57.487 --> 00:01:00.573 from the early versions of J2EE. 24 00:01:01.630 --> 00:01:03.660 And then also, we want to promote loose coupling 25 00:01:03.660 --> 00:01:06.100 by making use of dependency injection. 26 00:01:06.100 --> 00:01:08.332 So instead of hard wiring your objects together, 27 00:01:08.332 --> 00:01:11.640 you simply specify the wiring via a configuration file 28 00:01:11.640 --> 00:01:15.250 or annotations, and we'll cover that a lot in this course. 29 00:01:15.250 --> 00:01:17.580 Then the next idea is declarative programming 30 00:01:17.580 --> 00:01:19.820 with Aspect Oriented Programming, or AOP. 31 00:01:19.820 --> 00:01:22.800 This'll basically allow you to add 32 00:01:22.800 --> 00:01:26.763 some applicationwide services to your given objects. 33 00:01:29.080 --> 00:01:30.660 And then finally, the main thing here 34 00:01:30.660 --> 00:01:33.480 is to minimize boilerplate Java code. 35 00:01:33.480 --> 00:01:36.530 So in the early days of J2EE, there was a lot of code 36 00:01:36.530 --> 00:01:38.850 that you had to write, and so the folks at Spring, 37 00:01:38.850 --> 00:01:40.917 they created a collection of helper classes 38 00:01:40.917 --> 00:01:42.700 to make it easier, 39 00:01:42.700 --> 00:01:45.900 and again, to minimize all of the boilerplate code, 40 00:01:45.900 --> 00:01:47.490 and we'll see some examples of that 41 00:01:47.490 --> 00:01:48.940 a little later in the course. 42 00:01:50.810 --> 00:01:53.290 Now, this is kind of a big picture here, 43 00:01:53.290 --> 00:01:54.750 of the Spring Framework and this is kind of 44 00:01:54.750 --> 00:01:56.580 like the core Framework. 45 00:01:56.580 --> 00:01:57.940 And what I'll do is I'll actually 46 00:01:57.940 --> 00:02:00.160 go through these various sections here 47 00:02:00.160 --> 00:02:01.429 and just give you a quick overview, 48 00:02:01.429 --> 00:02:03.513 as far as what they're about. 49 00:02:06.310 --> 00:02:07.720 Alright, so let's go ahead and start here 50 00:02:07.720 --> 00:02:09.210 with the Core Container. 51 00:02:09.210 --> 00:02:12.850 So the Core Container's like the heartthrob, the main, 52 00:02:12.850 --> 00:02:15.490 I guess, the main item here of Spring. 53 00:02:15.490 --> 00:02:18.334 So basically, it manages how Beans are created. 54 00:02:18.334 --> 00:02:22.200 It has a Bean factory for creating the Beans. 55 00:02:22.200 --> 00:02:24.360 It basically can reconfig. files 56 00:02:24.360 --> 00:02:26.676 for setting properties, independencies 57 00:02:26.676 --> 00:02:30.330 and also the Context here's really the Spring Container 58 00:02:30.330 --> 00:02:32.500 that holds the Beans in memory. 59 00:02:32.500 --> 00:02:34.273 And then there's SpEL, 60 00:02:34.273 --> 00:02:35.900 that's for the Spring Expression Language, 61 00:02:35.900 --> 00:02:38.010 so it's a little language we can use 62 00:02:38.010 --> 00:02:40.240 within the config. files to refer to other Beans, 63 00:02:40.240 --> 00:02:41.720 and we'll see example of that later. 64 00:02:41.720 --> 00:02:43.070 But that's kind of the Core Container, 65 00:02:43.070 --> 00:02:46.363 for creating Beans and then making those Beans available. 66 00:02:48.610 --> 00:02:50.490 So let's move over to the AOP section. 67 00:02:50.490 --> 00:02:52.200 So this is where you have support 68 00:02:52.200 --> 00:02:54.206 for Aspect Oriented Programming. 69 00:02:54.206 --> 00:02:57.450 So basically, what AOP, in a nutshell, 70 00:02:57.450 --> 00:03:01.000 it allows you to create these applicationwide services, 71 00:03:01.000 --> 00:03:06.000 like logging, security, transactions, instrumentation 72 00:03:06.330 --> 00:03:09.010 and then you can apply these services to your objects 73 00:03:09.010 --> 00:03:12.990 in a declarative fashion, so no need to modify your code 74 00:03:12.990 --> 00:03:14.550 to have support for this. 75 00:03:14.550 --> 00:03:16.990 You simply add a config. in the config. file 76 00:03:16.990 --> 00:03:18.460 or an annotation, 77 00:03:18.460 --> 00:03:22.090 and that service will be applied to your application. 78 00:03:22.090 --> 00:03:23.916 And we'll see examples of this, 79 00:03:23.916 --> 00:03:26.281 primarily when we get into some transaction work, 80 00:03:26.281 --> 00:03:29.131 but some other areas too we'll play around with it a bit. 81 00:03:30.940 --> 00:03:32.130 So then, moving forward here, 82 00:03:32.130 --> 00:03:35.314 let's take a look at the Data Access section or integration. 83 00:03:35.314 --> 00:03:38.270 So basically, here, this is for communicating 84 00:03:38.270 --> 00:03:40.360 with the database, either a relational database 85 00:03:40.360 --> 00:03:42.050 or a NoSQL database. 86 00:03:42.050 --> 00:03:44.740 And also, making use of, like, a message queue. 87 00:03:44.740 --> 00:03:46.662 So on the top left, you have JDBC. 88 00:03:46.662 --> 00:03:49.360 Basically, Spring provides some helper classes 89 00:03:49.360 --> 00:03:53.320 to make it much easier to access a database, using JDBC. 90 00:03:53.320 --> 00:03:56.480 And, by using these Spring JDBC classes, 91 00:03:56.480 --> 00:04:00.670 you can actually reduce your source code by over 50%, 92 00:04:00.670 --> 00:04:03.380 so a lot of good helper classes there. 93 00:04:03.380 --> 00:04:05.230 The next little bullet there is ORM, 94 00:04:05.230 --> 00:04:07.128 for Object to Relational Mapping. 95 00:04:07.128 --> 00:04:08.997 This is probably the most popular section 96 00:04:08.997 --> 00:04:10.841 of this module, here. 97 00:04:10.841 --> 00:04:14.410 Basically, it allows you to hook into Hibernate, 98 00:04:14.410 --> 00:04:15.580 or hook into JPAs. 99 00:04:15.580 --> 00:04:17.630 A lot of support and a lot of synergy 100 00:04:17.630 --> 00:04:19.393 between Spring and Hibernate.