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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,522 --> 00:00:03,127 Alright, so we're making good progress here. 2 2 00:00:03,127 --> 00:00:05,131 Let's take a look at our next two steps. 3 3 00:00:05,131 --> 00:00:07,524 So in step two we're gonna add the component annotation 4 4 00:00:07,524 --> 00:00:09,042 to our Java class. 5 5 00:00:09,042 --> 00:00:11,489 In step three we'll retrieve the bean 6 6 00:00:11,489 --> 00:00:12,993 from the Spring container. 7 7 00:00:12,993 --> 00:00:14,089 So a lot of good stuff here. 8 8 00:00:14,089 --> 00:00:16,256 Let's go ahead and dig in. 9 9 00:00:17,975 --> 00:00:19,634 Alright, so what I wanna do is actually create 10 10 00:00:19,634 --> 00:00:21,545 our coach interface. 11 11 00:00:21,545 --> 00:00:22,978 So I'll just simply do a right click, 12 12 00:00:22,978 --> 00:00:24,978 I'll say New, Interface, 13 13 00:00:26,045 --> 00:00:29,247 and I'll give the interface name of Coach. 14 14 00:00:29,247 --> 00:00:33,414 I'll keep all the other defaults, and I'll hit Finish. 15 15 00:00:35,125 --> 00:00:37,038 And we've already seen the coach interface before 16 16 00:00:37,038 --> 00:00:38,036 in previous videos, 17 17 00:00:38,036 --> 00:00:39,753 and I'll just kinda write it here again from scratch, 18 18 00:00:39,753 --> 00:00:41,658 just to kinda keep things simple 19 19 00:00:41,658 --> 00:00:43,419 and keep things on track. 20 20 00:00:43,419 --> 00:00:46,132 So this coach interface will have one simple method 21 21 00:00:46,132 --> 00:00:47,397 just starting out. 22 22 00:00:47,397 --> 00:00:49,730 It's called getDailyWorkout. 23 23 00:00:52,474 --> 00:00:54,603 So the getDailyWorkout method returns a string, 24 24 00:00:54,603 --> 00:00:56,097 and it's a public method, and that's it. 25 25 00:00:56,097 --> 00:00:57,100 Again, just very simple. 26 26 00:00:57,100 --> 00:00:58,325 This is the coach interface, 27 27 00:00:58,325 --> 00:00:59,940 and then we'll have different implementations 28 28 00:00:59,940 --> 00:01:03,289 that'll actually implement this given interface. 29 29 00:01:03,289 --> 00:01:07,332 But this is enough to kinda get us started for right now. 30 30 00:01:07,332 --> 00:01:08,331 Alrighty, so now let's go ahead 31 31 00:01:08,331 --> 00:01:10,691 and create an actual Java class. 32 32 00:01:10,691 --> 00:01:12,939 And we're gonna add an annotation to that class. 33 33 00:01:12,939 --> 00:01:16,311 So again, I'll right click on our package name, 34 34 00:01:16,311 --> 00:01:20,311 Spring Demo, I'll say New and I'll choose Class. 35 35 00:01:22,208 --> 00:01:23,765 And so here we're gonna mix it up a little bit. 36 36 00:01:23,765 --> 00:01:25,972 We're gonna create a tennis coach, 37 37 00:01:25,972 --> 00:01:30,783 so that's the actual name of the class: TennisCoach. 38 38 00:01:30,783 --> 00:01:31,616 And then what I'd like to do 39 39 00:01:31,616 --> 00:01:33,699 is move down to the interfaces section 40 40 00:01:33,699 --> 00:01:35,943 and I like to click on the Add button here 41 41 00:01:35,943 --> 00:01:40,214 because we want to add an interface for this tennis coach. 42 42 00:01:40,214 --> 00:01:42,704 And the actual interface we're gonna choose is coach, 43 43 00:01:42,704 --> 00:01:44,314 so just type in coach up top, 44 44 00:01:44,314 --> 00:01:45,498 they'll give you that link, 45 45 00:01:45,498 --> 00:01:48,059 and then there we go, matching items. 46 46 00:01:48,059 --> 00:01:50,476 And then go ahead and hit OK. 47 47 00:01:53,596 --> 00:01:55,671 Great, so in Interfaces section you should see 48 48 00:01:55,671 --> 00:01:57,456 the coach interface listed. 49 49 00:01:57,456 --> 00:02:02,054 Let's keep all the other defaults, and then hit Finish. 50 50 00:02:02,054 --> 00:02:03,054 Okay, this is great. 51 51 00:02:03,054 --> 00:02:04,248 So this is what our coach should look like right now 52 52 00:02:04,248 --> 00:02:05,963 for our tennis coach. 53 53 00:02:05,963 --> 00:02:08,061 Let's go ahead and give ourselves 54 54 00:02:08,061 --> 00:02:09,196 a basic implementation here 55 55 00:02:09,196 --> 00:02:12,779 for a tennis coach for their daily workout. 56 56 00:02:14,816 --> 00:02:16,674 Let's just kind of dream up something. 57 57 00:02:16,674 --> 00:02:19,653 Practice your backhand volley. 58 58 00:02:19,653 --> 00:02:20,774 Yeah, that sounds about right. 59 59 00:02:20,774 --> 00:02:21,772 (chuckles) 60 60 00:02:21,772 --> 00:02:23,273 Alright, so that's the implementation here 61 61 00:02:23,273 --> 00:02:24,295 for our tennis coach. 62 62 00:02:24,295 --> 00:02:25,602 So these are the daily workouts 63 63 00:02:25,602 --> 00:02:28,596 that the tennis coach will provide when we ask him 64 64 00:02:28,596 --> 00:02:31,546 as far as, hey coach, what do we need to do today? 65 65 00:02:31,546 --> 00:02:33,854 Practice your backhand volley. 66 66 00:02:33,854 --> 00:02:34,852 Okay, great. 67 67 00:02:34,852 --> 00:02:36,007 So now the next thing we need to do 68 68 00:02:36,007 --> 00:02:38,494 is add the annotation here. 69 69 00:02:38,494 --> 00:02:41,997 So we need to add that @Component annotation. 70 70 00:02:41,997 --> 00:02:44,410 So again, this is a special annotation that Spring will use 71 71 00:02:44,410 --> 00:02:46,365 when they scan our classes, 72 72 00:02:46,365 --> 00:02:50,532 and then I'll give the actual bean ID of thatSillyCoach. 73 73 00:02:52,485 --> 00:02:54,233 So kind of hover over the @Component 74 74 00:02:54,233 --> 00:02:57,523 so we can fix the imports here. 75 75 00:02:57,523 --> 00:03:01,690 So I just select the option therefore of Import Component. 76 76 00:03:07,022 --> 00:03:09,470 And on line three we should have 77 77 00:03:09,470 --> 00:03:12,224 org.springframework.stereotype.Component. 78 78 00:03:12,224 --> 00:03:13,226 Great, this is good. 79 79 00:03:13,226 --> 00:03:17,143 So that's the correct import that we need here. 80 80 00:03:19,799 --> 00:03:22,450 So again, when Spring scans this package, 81 81 00:03:22,450 --> 00:03:24,455 they're gonna find this class, @Component, 82 82 00:03:24,455 --> 00:03:26,656 they're gonna automatically register this bean 83 83 00:03:26,656 --> 00:03:27,724 with the Spring container, 84 84 00:03:27,724 --> 00:03:30,888 and they'll use the bean ID of thatSillyCoach 85 85 00:03:30,888 --> 00:03:32,821 so at a later time we can retrieve that bean 86 86 00:03:32,821 --> 00:03:34,266 from the Spring container 87 87 00:03:34,266 --> 00:03:37,266 using the bean ID of thatSillyCoach. 88 88 00:03:39,907 --> 00:03:41,610 Alright, so we're making some really good progress here. 89 89 00:03:41,610 --> 00:03:43,621 So with step three, we need to write the code 90 90 00:03:43,621 --> 00:03:45,545 to retrieve the bean from the container. 91 91 00:03:45,545 --> 00:03:49,712 So I'll actually create another Java class for this. 92 92 00:03:51,562 --> 00:03:55,229 I'll choose right click, I'll say New Class. 93 93 00:03:56,659 --> 00:04:00,826 And the name for this class, I'll call it AnnotationDemoApp. 94 94 00:04:01,954 --> 00:04:05,010 And this is just a main driver program. 95 95 00:04:05,010 --> 00:04:06,349 It'll actually have a main method, 96 96 00:04:06,349 --> 00:04:10,516 so I'll select the option here at the bottom for main, 97 97 00:04:12,303 --> 00:04:14,474 and I'll keep all the other defaults here, 98 98 00:04:14,474 --> 00:04:16,557 and then I'll hit Finish. 99 99 00:04:18,292 --> 00:04:21,258 Okay, good, so just a very... 100 100 00:04:21,258 --> 00:04:22,821 Simple application here. 101 101 00:04:22,821 --> 00:04:25,229 Let me go ahead and clean up those auto-generated comments, 102 102 00:04:25,229 --> 00:04:26,756 and let me write in my own comments 103 103 00:04:26,756 --> 00:04:28,758 as far as the things that I wanna do 104 104 00:04:28,758 --> 00:04:30,758 inside of this demo app. 105 105 00:04:34,637 --> 00:04:35,659 So the first thing I'm gonna do 106 106 00:04:35,659 --> 00:04:37,530 is read the Spring config file, 107 107 00:04:37,530 --> 00:04:41,246 then I'll get the bean from the Spring container, 108 108 00:04:41,246 --> 00:04:43,894 I'll call some methods on the bean, 109 109 00:04:43,894 --> 00:04:46,922 and then finally, I'll close the container. 110 110 00:04:46,922 --> 00:04:48,368 And again, this is nothing really new. 111 111 00:04:48,368 --> 00:04:51,763 We've actually gone through this process many times before, 112 112 00:04:51,763 --> 00:04:52,838 and we'll do a similar thing here 113 113 00:04:52,838 --> 00:04:56,338 with the Spring annotation configurations. 114 114 00:04:57,726 --> 00:05:00,000 Alright, so let's go ahead and start writing some code here. 115 115 00:05:00,000 --> 00:05:01,579 So again, reading the Spring config file, 116 116 00:05:01,579 --> 00:05:03,704 just like we've already done. 117 117 00:05:03,704 --> 00:05:05,118 Give myself some white space at the bottom. 118 118 00:05:05,118 --> 00:05:06,109 So here I'll just make use 119 119 00:05:06,109 --> 00:05:09,359 of that ClassPathXMLApplicationContext. 120 120 00:05:12,709 --> 00:05:14,164 Context equals new. 121 121 00:05:14,164 --> 00:05:16,306 And again, I like to copy paste that name. 122 122 00:05:16,306 --> 00:05:19,051 So I just copy that name and paste it. 123 123 00:05:19,051 --> 00:05:20,251 I use the keyboard there. 124 124 00:05:20,251 --> 00:05:21,955 And then I give the actual name of the config file, 125 125 00:05:21,955 --> 00:05:24,348 so applicationContext.xml, and that's it. 126 126 00:05:24,348 --> 00:05:27,407 And again, remember, our XML file is really simple. 127 127 00:05:27,407 --> 00:05:28,643 There's not much in there. 128 128 00:05:28,643 --> 00:05:32,495 It simply tells Spring to scan for beans. 129 129 00:05:32,495 --> 00:05:35,662 I'll go ahead and fix my imports here. 130 130 00:05:36,524 --> 00:05:39,176 Goes on line three, we should have the correct import. 131 131 00:05:39,176 --> 00:05:40,759 So that looks good. 132 132 00:05:42,686 --> 00:05:43,767 Get the bean from the container. 133 133 00:05:43,767 --> 00:05:46,850 And again, we simply use the bean ID. 134 134 00:05:48,070 --> 00:05:50,535 So let me just take a quick peek. 135 135 00:05:50,535 --> 00:05:53,939 So in TennisCoach, the bean ID is thatSillyCoach. 136 136 00:05:53,939 --> 00:05:55,865 ThatSillyCoach! 137 137 00:05:55,865 --> 00:05:56,698 So I just copy it 138 138 00:05:56,698 --> 00:05:58,953 just so I have it in my little buffer here. 139 139 00:05:58,953 --> 00:06:02,182 And now I'll just go through and read the bean. 140 140 00:06:02,182 --> 00:06:03,437 So Coach, the Coach equals, 141 141 00:06:03,437 --> 00:06:05,854 and I'll say context.getBean, 142 142 00:06:07,110 --> 00:06:08,614 and I'll just do a little paste here 143 143 00:06:08,614 --> 00:06:11,185 of the actual bean ID, 144 144 00:06:11,185 --> 00:06:12,696 what I just copied. 145 145 00:06:12,696 --> 00:06:14,065 So I'll just do a paste. 146 146 00:06:14,065 --> 00:06:16,315 And then comma Coach.class. 147 147 00:06:17,185 --> 00:06:19,901 So again, remember, when you have that @Component 148 148 00:06:19,901 --> 00:06:21,169 on the actual tennis coach, 149 149 00:06:21,169 --> 00:06:23,812 you simply use whatever bean ID they provided, 150 150 00:06:23,812 --> 00:06:25,547 and that's what you do to retrieve it, and that's it. 151 151 00:06:25,547 --> 00:06:26,535 Very simple. 152 152 00:06:26,535 --> 00:06:28,226 So this is all good stuff. 153 153 00:06:28,226 --> 00:06:30,274 Everything that we're gonna do from the remaining here 154 154 00:06:30,274 --> 00:06:31,797 is what you've seen already. 155 155 00:06:31,797 --> 00:06:32,957 So there's nothing really new. 156 156 00:06:32,957 --> 00:06:35,340 So simply call the method on the bean. 157 157 00:06:35,340 --> 00:06:38,470 TheCoach.getDailyWorkout, which is all good. 158 158 00:06:38,470 --> 00:06:40,545 And then I simply close off the context 159 159 00:06:40,545 --> 00:06:42,628 by doing a context.close. 160 160 00:06:47,968 --> 00:06:49,765 Alright, so that's really all the work for step three 161 161 00:06:49,765 --> 00:06:52,760 of retrieving the bean from the container. 162 162 00:06:52,760 --> 00:06:55,109 We just went through and read the config file, 163 163 00:06:55,109 --> 00:06:59,061 got the bean, called a method on the bean, 164 164 00:06:59,061 --> 00:07:00,621 and then finally closed the context. 165 165 00:07:00,621 --> 00:07:02,462 So this looks really good, so let's go ahead and save this 166 166 00:07:02,462 --> 00:07:06,499 and let's go ahead and run this application. 167 167 00:07:06,499 --> 00:07:10,666 I'll just do a right click, Run As, Java Application. 168 168 00:07:12,407 --> 00:07:15,567 And then voila, there's our output! 169 169 00:07:15,567 --> 00:07:18,222 So it goes through, it says loading bean configurations 170 170 00:07:18,222 --> 00:07:20,592 from that applicationContext.xml. 171 171 00:07:20,592 --> 00:07:22,621 So this guy goes through and scans everything. 172 172 00:07:22,621 --> 00:07:24,144 It registers those beans, 173 173 00:07:24,144 --> 00:07:25,820 and then we simply call a method on it, 174 174 00:07:25,820 --> 00:07:29,783 print out our daily workout, practice your backhand volley, 175 175 00:07:29,783 --> 00:07:31,668 and we close it and that's it. 176 176 00:07:31,668 --> 00:07:32,501 There you go. 177 177 00:07:32,501 --> 00:07:36,426 So you've used Spring annotations in a Java application 178 178 00:07:36,426 --> 00:07:38,466 so you can kinda check that off your list. 179 179 00:07:38,466 --> 00:07:40,450 We're actually gonna go in detail 180 180 00:07:40,450 --> 00:07:42,304 and cover some more aspects of this, 181 181 00:07:42,304 --> 00:07:44,905 but you've kind of covered the basics so far. 182 182 00:07:44,905 --> 00:07:46,112 So I'd say, good job! 183 183 00:07:46,112 --> 00:07:47,222 Congratulations! 184 184 00:07:47,222 --> 00:07:48,055 Yoo-hoo! 15679