Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 1 00:00:00,500 --> 00:00:01,590 Hey, in this video, 2 2 00:00:01,590 --> 00:00:04,340 I'm going to give you an overview of the Spring Framework. 3 3 00:00:06,700 --> 00:00:09,990 So, first off, here's the official website for Spring. 4 4 00:00:09,990 --> 00:00:12,020 It's at www.spring.io. 5 5 00:00:12,020 --> 00:00:13,010 So, this is where you can get 6 6 00:00:13,010 --> 00:00:14,730 all the documentation for Spring, 7 7 00:00:14,730 --> 00:00:17,710 you can download Spring, you can look at some tutorials 8 8 00:00:17,710 --> 00:00:20,020 and also some getting started guides, 9 9 00:00:20,020 --> 00:00:23,033 and we'll use this website a lot during this course. 10 10 00:00:25,597 --> 00:00:27,290 So, why Spring? 11 11 00:00:27,290 --> 00:00:30,330 And I covered this in the last video, but again, 12 12 00:00:30,330 --> 00:00:33,940 in a nutshell, it's to simplify Java Enterprise Development, 13 13 00:00:33,940 --> 00:00:36,100 make it much simpler than what we had 14 14 00:00:36,100 --> 00:00:38,240 in J2EE or Java EE, 15 15 00:00:38,240 --> 00:00:39,923 and I gave all the pros and cons for that 16 16 00:00:39,923 --> 00:00:41,823 in the previous video. 17 17 00:00:42,800 --> 00:00:44,470 So, here, let's kind of drill down a bit 18 18 00:00:44,470 --> 00:00:47,590 and talk about the goals of Spring, like what are the goals. 19 19 00:00:47,590 --> 00:00:51,047 Well, first off, lightweight development with Java POJOs, 20 20 00:00:51,047 --> 00:00:53,940 and POJOs mean Plain Old Java Objects, 21 21 00:00:53,940 --> 00:00:55,500 make it much simpler to build, 22 22 00:00:55,500 --> 00:00:57,487 as compared to the heavyweight EJBs 23 23 00:00:57,487 --> 00:01:00,573 from the early versions of J2EE. 24 24 00:01:01,630 --> 00:01:03,660 And then also, we want to promote loose coupling 25 25 00:01:03,660 --> 00:01:06,100 by making use of dependency injection. 26 26 00:01:06,100 --> 00:01:08,332 So instead of hard wiring your objects together, 27 27 00:01:08,332 --> 00:01:11,640 you simply specify the wiring via a configuration file 28 28 00:01:11,640 --> 00:01:15,250 or annotations, and we'll cover that a lot in this course. 29 29 00:01:15,250 --> 00:01:17,580 Then the next idea is declarative programming 30 30 00:01:17,580 --> 00:01:19,820 with Aspect Oriented Programming, or AOP. 31 31 00:01:19,820 --> 00:01:22,800 This'll basically allow you to add 32 32 00:01:22,800 --> 00:01:26,763 some applicationwide services to your given objects. 33 33 00:01:29,080 --> 00:01:30,660 And then finally, the main thing here 34 34 00:01:30,660 --> 00:01:33,480 is to minimize boilerplate Java code. 35 35 00:01:33,480 --> 00:01:36,530 So in the early days of J2EE, there was a lot of code 36 36 00:01:36,530 --> 00:01:38,850 that you had to write, and so the folks at Spring, 37 37 00:01:38,850 --> 00:01:40,917 they created a collection of helper classes 38 38 00:01:40,917 --> 00:01:42,700 to make it easier, 39 39 00:01:42,700 --> 00:01:45,900 and again, to minimize all of the boilerplate code, 40 40 00:01:45,900 --> 00:01:47,490 and we'll see some examples of that 41 41 00:01:47,490 --> 00:01:48,940 a little later in the course. 42 42 00:01:50,810 --> 00:01:53,290 Now, this is kind of a big picture here, 43 43 00:01:53,290 --> 00:01:54,750 of the Spring Framework and this is kind of 44 44 00:01:54,750 --> 00:01:56,580 like the core Framework. 45 45 00:01:56,580 --> 00:01:57,940 And what I'll do is I'll actually 46 46 00:01:57,940 --> 00:02:00,160 go through these various sections here 47 47 00:02:00,160 --> 00:02:01,429 and just give you a quick overview, 48 48 00:02:01,429 --> 00:02:03,513 as far as what they're about. 49 49 00:02:06,310 --> 00:02:07,720 Alright, so let's go ahead and start here 50 50 00:02:07,720 --> 00:02:09,210 with the Core Container. 51 51 00:02:09,210 --> 00:02:12,850 So the Core Container's like the heartthrob, the main, 52 52 00:02:12,850 --> 00:02:15,490 I guess, the main item here of Spring. 53 53 00:02:15,490 --> 00:02:18,334 So basically, it manages how Beans are created. 54 54 00:02:18,334 --> 00:02:22,200 It has a Bean factory for creating the Beans. 55 55 00:02:22,200 --> 00:02:24,360 It basically can reconfig. files 56 56 00:02:24,360 --> 00:02:26,676 for setting properties, independencies 57 57 00:02:26,676 --> 00:02:30,330 and also the Context here's really the Spring Container 58 58 00:02:30,330 --> 00:02:32,500 that holds the Beans in memory. 59 59 00:02:32,500 --> 00:02:34,273 And then there's SpEL, 60 60 00:02:34,273 --> 00:02:35,900 that's for the Spring Expression Language, 61 61 00:02:35,900 --> 00:02:38,010 so it's a little language we can use 62 62 00:02:38,010 --> 00:02:40,240 within the config. files to refer to other Beans, 63 63 00:02:40,240 --> 00:02:41,720 and we'll see example of that later. 64 64 00:02:41,720 --> 00:02:43,070 But that's kind of the Core Container, 65 65 00:02:43,070 --> 00:02:46,363 for creating Beans and then making those Beans available. 66 66 00:02:48,610 --> 00:02:50,490 So let's move over to the AOP section. 67 67 00:02:50,490 --> 00:02:52,200 So this is where you have support 68 68 00:02:52,200 --> 00:02:54,206 for Aspect Oriented Programming. 69 69 00:02:54,206 --> 00:02:57,450 So basically, what AOP, in a nutshell, 70 70 00:02:57,450 --> 00:03:01,000 it allows you to create these applicationwide services, 71 71 00:03:01,000 --> 00:03:06,000 like logging, security, transactions, instrumentation 72 72 00:03:06,330 --> 00:03:09,010 and then you can apply these services to your objects 73 73 00:03:09,010 --> 00:03:12,990 in a declarative fashion, so no need to modify your code 74 74 00:03:12,990 --> 00:03:14,550 to have support for this. 75 75 00:03:14,550 --> 00:03:16,990 You simply add a config. in the config. file 76 76 00:03:16,990 --> 00:03:18,460 or an annotation, 77 77 00:03:18,460 --> 00:03:22,090 and that service will be applied to your application. 78 78 00:03:22,090 --> 00:03:23,916 And we'll see examples of this, 79 79 00:03:23,916 --> 00:03:26,281 primarily when we get into some transaction work, 80 80 00:03:26,281 --> 00:03:29,131 but some other areas too we'll play around with it a bit. 81 81 00:03:30,940 --> 00:03:32,130 So then, moving forward here, 82 82 00:03:32,130 --> 00:03:35,314 let's take a look at the Data Access section or integration. 83 83 00:03:35,314 --> 00:03:38,270 So basically, here, this is for communicating 84 84 00:03:38,270 --> 00:03:40,360 with the database, either a relational database 85 85 00:03:40,360 --> 00:03:42,050 or a NoSQL database. 86 86 00:03:42,050 --> 00:03:44,740 And also, making use of, like, a message queue. 87 87 00:03:44,740 --> 00:03:46,662 So on the top left, you have JDBC. 88 88 00:03:46,662 --> 00:03:49,360 Basically, Spring provides some helper classes 89 89 00:03:49,360 --> 00:03:53,320 to make it much easier to access a database, using JDBC. 90 90 00:03:53,320 --> 00:03:56,480 And, by using these Spring JDBC classes, 91 91 00:03:56,480 --> 00:04:00,670 you can actually reduce your source code by over 50%, 92 92 00:04:00,670 --> 00:04:03,380 so a lot of good helper classes there. 93 93 00:04:03,380 --> 00:04:05,230 The next little bullet there is ORM, 94 94 00:04:05,230 --> 00:04:07,128 for Object to Relational Mapping. 95 95 00:04:07,128 --> 00:04:08,997 This is probably the most popular section 96 96 00:04:08,997 --> 00:04:10,841 of this module, here. 97 97 00:04:10,841 --> 00:04:14,410 Basically, it allows you to hook into Hibernate, 98 98 00:04:14,410 --> 00:04:15,580 or hook into JPAs. 99 99 00:04:15,580 --> 00:04:17,630 A lot of support and a lot of synergy 100 100 00:04:17,630 --> 00:04:19,393 between Spring and Hibernate. 8701