WEBVTT 00:00.080 --> 00:00.650 Hi everyone. 00:00.650 --> 00:01.250 Welcome back. 00:01.250 --> 00:05.960 In this lecture we'll learn about the simple web server that's part of Java. 00:05.990 --> 00:08.390 This was released as part of Java 18. 00:08.390 --> 00:12.620 And it's part of the Java distribution that we installed in our machine. 00:12.620 --> 00:17.000 This web server serves the files and folders from your machine. 00:17.000 --> 00:17.990 That's all it does. 00:17.990 --> 00:19.670 Nothing more, nothing less. 00:19.670 --> 00:25.340 Probably you might have this question running in your head, why is this being released in Java in the 00:25.340 --> 00:26.000 first place? 00:26.000 --> 00:32.960 So the primary goal of this simple web server is that can be used for prototyping, testing and debugging. 00:32.960 --> 00:35.810 So how do we launch this simple web server in your machine? 00:35.810 --> 00:41.180 We can launch the simple web server by running the J web server in the terminal. 00:41.180 --> 00:46.550 So when you run this, this is going to automatically launch the web server that's going to be serving 00:46.550 --> 00:48.650 up the files and folders from your machine. 00:48.650 --> 00:53.090 And some of the things that you need to be aware of when it comes to J web server is that it has the 00:53.090 --> 00:56.810 support for just the get and head requests only. 00:56.810 --> 01:05.470 The next thing is Https is not supported, and it has just the support for HTTP 1.1, which means http 01:05.470 --> 01:05.680 t. 01:05.770 --> 01:11.050 2.0 is not supported, so that's all you need to know from a theoretical aspect of it. 01:11.050 --> 01:13.390 Now let's go ahead and explore this in action. 01:13.390 --> 01:16.990 So in this case I'm going to go back to the terminal or to my IntelliJ. 01:16.990 --> 01:22.420 So in the IntelliJ if you open your Explore Java Features project and then if you go to the resources 01:22.420 --> 01:22.960 directory. 01:22.960 --> 01:25.360 So in the resources directory you will notice two files. 01:25.390 --> 01:26.920 Number one is movies JSON. 01:26.920 --> 01:31.240 So this movies JSON returns you an array of different movies actually. 01:31.240 --> 01:35.710 And if you take a look at it, it has ten movies in this particular JSON file. 01:35.710 --> 01:39.040 And then you have another file named movie ID by JSON. 01:39.040 --> 01:40.780 So this is a one single file. 01:40.780 --> 01:42.940 So this is a single JSON element. 01:42.940 --> 01:46.270 That's the reason why the name is movie ID by JSON. 01:46.270 --> 01:52.180 So what we are going to do here is that using the J-web server we are going to be serving up these two 01:52.180 --> 01:52.930 Jsons. 01:52.960 --> 01:53.200 Okay. 01:53.230 --> 01:55.330 And then we are going to look at it in the browser. 01:55.330 --> 01:56.590 So the very first thing is. 01:56.590 --> 01:58.960 So I'm in the root path of this specific project. 01:58.960 --> 02:00.930 In this case, you can see the modern Java, right? 02:00.960 --> 02:02.670 That's where I'm on right now. 02:02.670 --> 02:06.270 And then what I'm going to do, I'm going to run a J web server. 02:06.300 --> 02:10.740 If you run this command, what this is going to give you is that this is going to be starting up the 02:10.740 --> 02:12.870 web server in the port 8080. 02:12.900 --> 02:15.600 As you can see, it is running in the port 8080. 02:15.600 --> 02:22.080 And what it is telling you here is that serving the content under modern Java and the subdirectories 02:22.080 --> 02:27.360 on port 127.0.0.1 and port 8080. 02:27.390 --> 02:30.300 Okay, let's copy this and then let's go to the browser. 02:30.720 --> 02:34.650 So in the browser I'm going to hit this endpoint. 02:34.650 --> 02:39.540 So if I hit this endpoint this is exactly what we have in our IntelliJ actually. 02:39.540 --> 02:44.040 So if you go to the IntelliJ you have this check out service Explore Java features. 02:44.070 --> 02:47.460 So you have the check out service here you have the Explore Java features here. 02:47.460 --> 02:50.400 And then you have the modules folder here. 02:50.400 --> 02:52.500 And then the Readme Gradle. 02:52.650 --> 02:58.590 You see right the Gradle over here we have the readme and then we have the settings.gradle dot CSS. 02:58.620 --> 03:01.470 All those files are hosted in this web address. 03:01.470 --> 03:07.410 And now what we are going to do is that we are going to be hosting the movie ID by Jason and the movie 03:07.410 --> 03:09.420 by our movie star, Jason. 03:09.420 --> 03:14.160 So if you go to the actual resources directory in the resources directory, I have all these commands 03:14.160 --> 03:15.090 readily available. 03:15.090 --> 03:22.890 So if you go to the commands dot, txt so you can actually copy this and then hit this endpoint from 03:22.890 --> 03:23.460 the browser. 03:23.460 --> 03:24.330 So if you hit this one. 03:24.330 --> 03:24.840 So there you go. 03:24.870 --> 03:29.580 It gives you all the movies that's been present in this specific directory okay. 03:29.610 --> 03:37.470 And then in this case if we hit movie ID by Jason it's going to just serve up that specific file. 03:37.470 --> 03:42.690 And let's say if you just provide the resources over here, it's going to serve up all the files in 03:42.690 --> 03:44.310 this specific folder. 03:44.310 --> 03:50.370 So the J-web server is useful if you have any kind of testing going on where you are building a UI. 03:50.370 --> 03:52.380 And the UI requires a simple JSON. 03:52.380 --> 03:58.070 So in those kind of scenarios, basically you can use J-web server to host those files, and you can 03:58.070 --> 04:00.200 prototype your UI based on that. 04:00.200 --> 04:05.690 Or it could be a back end service, require some kind of a response from another service, but the other 04:05.690 --> 04:06.950 service is not ready yet. 04:06.980 --> 04:12.530 You can simply use your server to give you the response whatever you want through an endpoint call like 04:12.530 --> 04:12.890 this. 04:12.890 --> 04:14.750 So we have this option available. 04:14.750 --> 04:20.360 So any time you are looking for a real network call that can serve up a JSON or any kind of content 04:20.360 --> 04:26.960 over the network, then you can use the simple web server by running the J-web server command like this. 04:26.960 --> 04:29.330 And then it can serve up the files and folders. 04:29.330 --> 04:32.600 In this case, any call that's been made, it will be logged over here. 04:32.600 --> 04:36.530 So in this case, if I hit this one more time and you'll be noticing a call over there. 04:36.560 --> 04:36.980 There you go. 04:36.980 --> 04:38.930 So all these calls get logged to. 04:38.960 --> 04:40.640 So that's all about simple web server. 04:40.640 --> 04:45.860 In the next section we are going to be exploring the new HTTP client that got released as part of modern 04:45.860 --> 04:46.280 Java. 04:46.280 --> 04:51.830 And we will be using the web server as a back end for that HTTP client, which is exactly the purpose 04:51.830 --> 04:53.420 of the J web server. 04:53.450 --> 04:54.920 This marks the end of this lecture. 04:54.920 --> 04:56.270 Thank you for watching.