feat(rest-api): initial commit: NOT working
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# Files
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.classpath
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.externalToolBuilders
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.gradle
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.project
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.pydevproject
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.settings
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.sonar
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*~
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*.ipr
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*.iml
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*.iws
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*.swp
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*.DS_Store
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*.snap.debug
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dependency-reduced-pom.xml
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# Directories
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.idea/
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.run/
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.venv/
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_site/
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build/
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dist/
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docs/_build/
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gen-java/
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gen-javabean/
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gen-py/
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node_modules/
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target/
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# Overview
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This project can serve as starting point for a REST API.
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# Links
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[Creating a REST API](https://happycoding.io/tutorials/java-server/rest-api)
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<name>rest_api</name>
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<description>description</description>
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<url>https://swingbe.de</url>
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<groupId>de.swingbe</groupId>
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<artifactId>rest_api</artifactId>
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<version>0.0.1</version>
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<packaging>jar</packaging>
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<licenses>
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<license>
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<name>GNU General Public License</name>
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<url>https://www.gnu.org/licenses/gpl-3.0.txt</url>
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</license>
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</licenses>
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<scm>
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<url>https://github.com/Software-Ingenieur-Begerad/sandbox-java</url>
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</scm>
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<properties>
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<!-- Other properties -->
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies><!-- https://mvnrepository.com/artifact/org.json/json -->
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<dependency>
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<groupId>org.json</groupId>
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<artifactId>json</artifactId>
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<version>20220320</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.10.1</version>
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<configuration>
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<!-- Target Java versions -->
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<release>11</release>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>3.2.4</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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<configuration>
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<filters>
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<filter>
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<!-- exclude signatures from merged JAR to avoid invalid signature messages -->
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<artifact>*:*</artifact>
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<excludes>
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<exclude>META-INF/*.SF</exclude>
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<exclude>META-INF/*.DSA</exclude>
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<exclude>META-INF/*.RSA</exclude>
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</excludes>
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</filter>
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</filters>
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<!-- The shaded JAR will not be the main artifact for the project, it will be attached
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for deployment in the way source and docs are. -->
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<shadedArtifactAttached>true
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</shadedArtifactAttached>
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<shadedClassifierName>shaded</shadedClassifierName>
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<transformers>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
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<transformer
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implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<manifestEntries>
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<Main-Class>de.swingbe.rest_api.Main
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</Main-Class>
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</manifestEntries>
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</transformer>
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</transformers>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>
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package de.swingbe.rest_api;
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public class Main {
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public static void main(String[] args) {
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System.out.println("Hello world!");
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return;
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}
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}
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package de.swingbe.rest_api.controller;
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import java.io.IOException;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import de.swingbe.rest_api.model.Person;
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import de.swingbe.rest_api.storage.DataStore;
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import org.json.JSONObject;
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public class PersonServlet extends HttpServlet {
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@Override
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public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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String requestUrl = request.getRequestURI();
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String name = requestUrl.substring("/people/".length());
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Person person = DataStore.getInstance().getPerson(name);
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if (person != null) {
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String json = "{\n";
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json += "\"name\": " + JSONObject.quote(person.getName()) + ",\n";
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json += "\"about\": " + JSONObject.quote(person.getAbout()) + ",\n";
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json += "\"birthYear\": " + person.getBirthYear() + "\n";
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json += "}";
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response.getOutputStream().println(json);
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} else {
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//That person wasn't found, so return an empty JSON object. We could also return an error.
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response.getOutputStream().println("{}");
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}
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}
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@Override
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public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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String name = request.getParameter("name");
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String about = request.getParameter("about");
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int birthYear = Integer.parseInt(request.getParameter("birthYear"));
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DataStore.getInstance().putPerson(new Person(name, about, birthYear));
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}
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}
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package de.swingbe.rest_api.model;
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public class Person {
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private final String name;
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private final String about;
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private final int birthYear;
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public Person(String name, String about, int birthYear) {
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this.name = name;
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this.about = about;
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this.birthYear = birthYear;
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}
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public String getName() {
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return name;
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}
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public String getAbout() {
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return about;
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}
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public int getBirthYear() {
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return birthYear;
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}
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}
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package de.swingbe.rest_api.storage;
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import de.swingbe.rest_api.model.Person;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Example DataStore class that provides access to user data.
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* Pretend this class accesses a database.
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*/
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public class DataStore {
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//this class is a singleton and should not be instantiated directly!
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private static final DataStore instance = new DataStore();
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//Map of names to Person instances.
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private final Map<String, Person> personMap = new HashMap<>();
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//private constructor so people know to use the getInstance() function instead
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private DataStore() {
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//dummy data
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personMap.put("Ada", new Person("Ada", "Ada Lovelace was the first programmer.", 1815));
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personMap.put("Kevin", new Person("Kevin", "Kevin is the author of HappyCoding.io.", 1986));
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personMap.put("Stanley", new Person("Stanley", "Stanley is Kevin's cat.", 2007));
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}
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public static DataStore getInstance() {
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return instance;
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}
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public Person getPerson(String name) {
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return personMap.get(name);
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}
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public void putPerson(Person person) {
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personMap.put(person.getName(), person);
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}
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}
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<web-app
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://xmlns.jcp.org/xml/ns/javaee"
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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
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http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
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version="3.1">
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<servlet>
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<servlet-name>PersonServlet</servlet-name>
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<servlet-class>PersonServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>PersonServlet</servlet-name>
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<url-pattern>/people/*</url-pattern>
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</servlet-mapping>
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</web-app>
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