diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..c0925ae --- /dev/null +++ b/.gitattributes @@ -0,0 +1,2 @@ +* text=auto +eol=lf \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c0ee6a6 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules +/Client/node_modules \ No newline at end of file diff --git a/Client/README.md b/Client/README.md new file mode 100644 index 0000000..1a50efa --- /dev/null +++ b/Client/README.md @@ -0,0 +1,3 @@ +## Nodejs + +/views - html templates with ETA, a nice express template engine like EJS \ No newline at end of file diff --git a/Client/package-lock.json b/Client/package-lock.json new file mode 100644 index 0000000..61b4e6d --- /dev/null +++ b/Client/package-lock.json @@ -0,0 +1,379 @@ +{ + "name": "node", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "accepts": { + "version": "1.3.7", + "resolved": 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"https://registry.npmjs.org/vary/-/vary-1.1.2.tgz", + "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=" + } + } +} diff --git a/Client/package.json b/Client/package.json new file mode 100644 index 0000000..85303c7 --- /dev/null +++ b/Client/package.json @@ -0,0 +1,21 @@ +{ + "name": "node-java-tenten", + "version": "0.0.1", + "description": "", + "main": "server.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [ + "nodejs", + "java", + "tenten" + ], + "author": "@LeanKhan", + "license": "ISC", + "dependencies": { + "body-parser": "^1.19.0", + "eta": "^1.12.1", + "express": "^4.17.1" + } +} diff --git a/Client/server.js b/Client/server.js new file mode 100644 index 0000000..d37c68b --- /dev/null +++ b/Client/server.js @@ -0,0 +1,98 @@ +const express = require("express"); +const bodyParser = require("body-parser"); + +const app = express(); +const eta = require("eta"); + +const net = require("net"); + +app.use(bodyParser.urlencoded({ extended: true })); +app.use(bodyParser.json()); + +eta.configure({ useWith: true }); + +app.engine("eta", eta.renderFile); + +app.set("view engine", "eta"); + +app.set("views", "./views"); + +function createRequest(method, message, data) { + return `${method} | ${message} | ${data}\n`; +} + +function send(client, method, message, data = "-") { + client.write(createRequest(method, message, data)); +} + +const client = net.connect({ port: 5555 }, () => { + //NOTE: use same port of server! + console.log("connected to server!"); + send(client, "GET", "message"); +}); + +client.setEncoding("utf8"); + +client.on("data", (data) => { + // jUst to log all responses from the Java server... + console.log(data.toString()); +}); + +client.on("end", () => { + console.log("disconnected from java server"); +}); + +app.get("/", (req, res) => { + res.render("index"); +}); + +app.get("/person", (req, res) => { + + // We are sending a request to the Java server for a person... + send(client, "GET", "person"); + + client.once("data", (response) => { + const p = response.toString().replace("\r\n", ""); + + // shorthand for const status = Array[0]... + const [status, message, data] = p.split(" | "); + + let parsed; + + try{ + parsed = JSON.parse(data); + } catch (err) { + console.log('Could not parse response :/'); + parsed = data; + } + + console.log(parsed); + + res.render("person", {person: parsed}); + }); +}); + +app.post("/person", (req, res) => { + + // We stringify the form data + const p = JSON.stringify(req.body); + + // We are sending a sending a POST request to the Java server.Java + // to create a new Person Object. + send(client, "POST", "person", p); + + client.once("data", (response) => { + const p = response.toString().replace("\r\n", ""); + + const [status, message, data] = p.split(" | "); + + console.log(`Response from Java => ${status} ${message} ${data}`); + + // go back to the Person page so that we can see the just created Person. + res.redirect('/person'); + }); +}); + +app.listen(process.env.PORT || 3000, () => { + console.log("Node Server-Client started!"); +}); diff --git a/Client/views/index.eta b/Client/views/index.eta new file mode 100644 index 0000000..ddcecd3 --- /dev/null +++ b/Client/views/index.eta @@ -0,0 +1,15 @@ + + + + + Person + + +

Welcome to Nodejs ft. Java

+ + + + + diff --git a/Client/views/person.eta b/Client/views/person.eta new file mode 100644 index 0000000..66914fd --- /dev/null +++ b/Client/views/person.eta @@ -0,0 +1,57 @@ + + + + + New Person + + +

The Person

+ + <% if (typeof person != 'undefined' && person != null && person.firstname) { %> +
    +
  1. +
    +
      +
    • Firstname: <%= person.firstname %>
      • +
    • Lastname: <%= person.lastname %>
      • +
    • Age: <%= person.age %>
      • +
    • Major: <%= person.major %>
      • +
    +
    +
    2. +
+ <% } else { %> +

No person yet! You can make one below:

+ <% } %> + + +

Create Person Object

+
+ + +
+ + + +
+ + + +
+ + + +
+ + +
+ + diff --git a/README.md b/README.md new file mode 100644 index 0000000..078b540 --- /dev/null +++ b/README.md @@ -0,0 +1,60 @@ +## Lost Luggage System + +The NodeJS server renders the pages, we send the requests to the Java server +and render the results. That's basically it. + +## What you need: + +1. Nodejs +2. Java 11 (jdk sha when you open vscode it will tell you to download it) +3. VSCode +4. The VSCode Java Extension Pack +5. Maven (not necassary tbh) +6. Download thes Jackson JAR files and save them in something like: c://dev/jarDownloads/\*.jar +7. Add the packages to your workspace from VSCode... +8. NPM + +I think that's all you need. I will update this sha... + +To get started: + +1. Fork the repo or something +2. Get it on your local machine +3. Get everything you don't have in "What you need". Pay attention to the versions lol +4. Open 2 vscode windows. One for `Client` and the other for `SocketServer` (if you want but I found this to be optimal for now) +5. Run `npm install` from the Client directory +6. After the Node modules have installed, go to the Java server and click the play button besides SocketServer in the 'Java Projects' panel. (it's bottom left) +7. If it runs successfully you should see 'waiting for connection...' +8. THEN you run the Nodejs server by doing `node server.js` from the Client directory. The order is important. Always start the Java before the Node. +9. Go to `localhost:3000` +10. Voila! It _should_ work lol + +- LeanKhan + +links: + +- https://gist.github.com/mpj/a979ded460dd52eb536a => my lucky break lol. I tried other Java socket server implementations but this one just worked and they showed me how to connect the Nodejs client. Awesome. grateful I am + +- More about Nodejs NET module https://www.javatpoint.com/nodejs-net + +- https://stackoverflow.com/questions/47359632/nodejs-getting-response-from-net-socket-write the comment under the accepted answer was a game changer! + +- https://github.com/redhat-developer/vscode-java/wiki/JDK-Requirements#java.configuration.runtimes => about redhat java vscode extension + +- about jackson json package => https://blog.codota.com/how-to-convert-a-java-object-into-a-json-string/ + +- The jackson package homepage => https://github.com/FasterXML/jackson + +- about jackson installation NOTE: you don't need to do the maven stuff, just download the .jar files from Maven (link below) and add them to your project from vscode... => http://tutorials.jenkov.com/java-json/jackson-installation.html + +- jackson packages on Maven NOTE download all three: annotation, core and databindind => https://search.maven.org/search?q=g:com.fasterxml.jackson.core + +- very good guide on using java on vscode RECOMMENDED READING => https://blog.usejournal.com/visual-studio-code-for-java-the-ultimate-guide-2019-8de7d2b59902 + NOTE=> when you get to the part about adding package, you don't need to make a .classpath file just add the packages form vscode gan. + +- some stuff about Java Socket servers for more knowledge and shii => https://www.codejava.net/java-se/networking/java-socket-server-examples-tcp-ip + +- the java server might be stuck waiting for the end of the clients request => https://stackoverflow.com/questions/55870574/cant-send-data-from-java-socket-server-to-nodejs-client + NOTE: the end of every request from the nodejs server is a new line '\n' because that's how Java will know the line has ended! If there's no new line it will think more data is coming and will hang... + +- some oracle java scoket shii (might be useful) => https://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html diff --git a/SocketServer/.vscode/settings.json b/SocketServer/.vscode/settings.json new file mode 100644 index 0000000..649cc18 --- /dev/null +++ b/SocketServer/.vscode/settings.json @@ -0,0 +1,15 @@ +{ + "files.exclude": { + "**/.classpath": false, + "**/.project": true, + "**/.settings": true, + "**/.factorypath": true, + "*/*.class": true + }, + "java.project.referencedLibraries": [ + "lib/**/*.jar", + "c:\\dev\\jarDownloads\\jackson-core-2.12.0.jar", + "c:\\dev\\jarDownloads\\jackson-databind-2.12.1.jar", + "c:\\dev\\jarDownloads\\jackson-annotations-2.12.1.jar" + ] +} diff --git a/SocketServer/README.md b/SocketServer/README.md new file mode 100644 index 0000000..a59d5f6 --- /dev/null +++ b/SocketServer/README.md @@ -0,0 +1,20 @@ +## Getting Started + +Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code. + +## Folder Structure + +The workspace contains two folders by default, where: + +- `src`: the folder to maintain sources +- `lib`: the folder to maintain dependencies + +## Dependency Management + +The `JAVA DEPENDENCIES` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-pack/blob/master/release-notes/v0.9.0.md#work-with-jar-files-directly). + +--- + +So this is the Java Socket Server. + +I put all the App stuff inside, App and just let the Server do only server things. diff --git a/SocketServer/src/App.java b/SocketServer/src/App.java new file mode 100644 index 0000000..84fdc69 --- /dev/null +++ b/SocketServer/src/App.java @@ -0,0 +1,45 @@ +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.databind.ObjectMapper; + +public class App { + private static Person person; + + public App() { + }; + + public Person getPerson() { + return App.person; + } + + public void createPerson(String personJSON) { + ObjectMapper mapper = new ObjectMapper(); + try { + Person p = mapper.readValue(personJSON, Person.class); + + App.person = p; + + System.out.printf("Person %s created successfully!", p.getFirstname()); + } catch (JsonProcessingException e) { + e.printStackTrace(); + } + } + + public String getPersonJSON() { + ObjectMapper mapper = new ObjectMapper(); + try { + + if (App.person == null) { + return ""; + } + + // this is a package that helps us work with JSON + String json = mapper.writeValueAsString(App.person); + + System.out.printf("Person %s gotten successfully!", App.person.getFirstname()); + return json; + } catch (JsonProcessingException e) { + e.printStackTrace(); + return ""; + } + } +} diff --git a/SocketServer/src/Person.java b/SocketServer/src/Person.java new file mode 100644 index 0000000..3e7499f --- /dev/null +++ b/SocketServer/src/Person.java @@ -0,0 +1,57 @@ +public class Person { + private Long id; + private String firstname; + private String lastname; + private int age; + private String major; + + public Person() { + }; + + public Person(Long id, String firstname, String lastname) { + this.id = id; + this.firstname = firstname; + this.lastname = lastname; + }; + + public Long getId() { + return id; + } + + public void setId(Long id) { + this.id = id; + } + + public String getFirstname() { + return firstname; + } + + public void setFirstname(String name) { + this.firstname = name; + } + + public String getLastname() { + return lastname; + } + + public void setLastname(String name) { + this.lastname = name; + } + + public void setAge(int age) { + this.age = age; + } + + public int getAge() { + return age; + } + + public void setMajor(String major) { + this.major = major; + } + + public String getMajor() { + return major; + } + +} diff --git a/SocketServer/src/Server.class b/SocketServer/src/Server.class new file mode 100644 index 0000000..b1af2da Binary files /dev/null and b/SocketServer/src/Server.class differ diff --git a/SocketServer/src/Server.java b/SocketServer/src/Server.java new file mode 100644 index 0000000..8be39d9 --- /dev/null +++ b/SocketServer/src/Server.java @@ -0,0 +1,115 @@ +import java.io.*; +import java.net.ServerSocket; +import java.net.Socket; + +public class Server { + + public static final int port = 12345; + private ServerSocket server; + private static App app; + + public static void log(String message) { + System.out.println(message); + } + + public static void send(PrintWriter writer, String status, String message, String data) { + writer.println(status + " | " + message + " | " + data); + } + + public void listen() { + try { + server = new ServerSocket(5555); + Server.app = new App(); + } catch (IOException e) { + System.out.println("Could not listen on port 5555 =>" + e); + System.exit(-1); + } + while (true) { + + try { + System.out.println("Waiting for connection"); + final Socket socket = server.accept(); + + final InputStream inputStream = socket.getInputStream(); + final InputStreamReader streamReader = new InputStreamReader(inputStream); + + OutputStream output = socket.getOutputStream(); + PrintWriter writer = new PrintWriter(output, true); + + BufferedReader br = new BufferedReader(streamReader); + + // readLine blocks until line arrives or socket closes, upon which it returns + // null + String line = null; + while ((line = br.readLine()) != null) { + log(line); + // line += br.readLine(); + // log(line); + handleRequest(line, writer); + } + + } catch (IOException e) { + System.out.println("Accept failed: 5555"); + System.exit(-1); + } + } + } + + private static void handleRequest(String request, PrintWriter writer) { + // Because "|" is a special character in .split() I have to use \\ to escape it. + // The frontend sends requests in this format => METHOD | ACTION/ENTITY sha more + // detail | PAYLOAD + String[] requestLines = request.split(" \\| "); + + String method = requestLines[0]; // e.g GET + String resource = requestLines[1]; // e.g person + String query = requestLines[2]; // e.g or payload {name: 'Emmanuel'} + + log(method); + log(resource); + log(query); + + if (method.equals("GET")) { + if (resource.equals("message")) { + send(writer, "SUCCESS", "message recieved :)", "-"); + return; + } + + if (resource.equals("person")) { + String p = Server.app.getPersonJSON(); + + send(writer, "SUCCESS", "Person fetched sucessffully!", p); + return; + } + + send(writer, "ERROR", "Unknown function!", "-"); + return; + } else if (method.equals("POST")) { + if (resource.equals("person")) { + log(query); + Server.app.createPerson(query); + send(writer, "SUCCESS", "Person created sucessffully!", "-"); + return; + } + + // TODO: you can add more methods! + // for example... + // if (resource.equals("delete-person")) { + // String p = Server.app.getPersonJSON(); + // writer.println("RES | " + p); + // return; + // } + + send(writer, "ERROR", "Unknown function!", "-"); + return; + } else { + send(writer, "ERROR", "Method not supported!", "-"); + return; + } + } + + /* creating new server and call it's listen method */ + public static void main(String[] args) { + new Server().listen(); + } +}