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Diff for: ‎.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" output="target/classes" path="src/main/java">
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<attributes>
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<attribute name="optional" value="true"/>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="src" output="target/test-classes" path="src/test/java">
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<attributes>
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<attribute name="optional" value="true"/>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
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<attributes>
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<attribute name="maven.pomderived" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="output" path="target/classes"/>
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</classpath>

Diff for: ‎.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>CallAPI2</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.m2e.core.maven2Builder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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<nature>org.eclipse.m2e.core.maven2Nature</nature>
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</natures>
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</projectDescription>

Diff for: ‎.settings/org.eclipse.core.resources.prefs

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eclipse.preferences.version=1
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encoding//src/main/java=UTF-8
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encoding//src/test/java=UTF-8
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encoding/<project>=UTF-8

Diff for: ‎.settings/org.eclipse.jdt.core.prefs

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.5
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org.eclipse.jdt.core.compiler.compliance=1.5
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org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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org.eclipse.jdt.core.compiler.source=1.5

Diff for: ‎.settings/org.eclipse.m2e.core.prefs

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activeProfiles=
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eclipse.preferences.version=1
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resolveWorkspaceProjects=true
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version=1

Diff for: ‎README.md

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# Demo on how to call an API and read JSON in Java with JAX-RS (Jersey) and Jackson
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This is a demo for ICSI 518 software engineering course offered in Fall 2017.
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This is a plain Java object, it uses Maven to manage dependencies. Download and import it into Eclipse to run.
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The main code is in CallAPI.java. It demonstrates how to use JAX-RS (Jersey) to call an RESTful API and get the JSON data. It then use Jackson to read properties from the JSON data. Feel free to copy code from here to your term project.

Diff for: ‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>edu.albany.mingying</groupId>
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<artifactId>CallAPI2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>CallAPI2</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.glassfish.jersey.core</groupId>
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<artifactId>jersey-client</artifactId>
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<version>2.26</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish.jersey.inject</groupId>
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<artifactId>jersey-hk2</artifactId>
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<version>2.26</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.9.2</version>
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</dependency>
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</dependencies>
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</project>

Diff for: ‎src/main/java/edu/albany/mingying/CallAPI2/CallAPI.java

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package edu.albany.mingying.CallAPI2;
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import java.io.IOException;
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import java.util.Iterator;
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import javax.ws.rs.client.Client;
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import javax.ws.rs.client.ClientBuilder;
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import javax.ws.rs.client.WebTarget;
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import javax.ws.rs.core.MediaType;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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public class CallAPI {
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public static void main(String[] args) {
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System.out.println("Calling AlphaVantage API...");
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Client client= ClientBuilder.newClient();
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// Core settings are here, put what ever API parameter you want to use
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WebTarget target= client.target("https://www.alphavantage.co/query")
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.queryParam("function", "TIME_SERIES_WEEKLY")
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.queryParam("symbol", "AAPL")
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.queryParam("apikey", "8LY5VJQYBZTYS262");
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// Actually calling API here, Use HTTP GET method
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// data is the response JSON string
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String data = target.request(MediaType.APPLICATION_JSON).get(String.class);
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try {
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// Use Jackson to read the JSON into a tree like structure
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ObjectMapper mapper = new ObjectMapper();
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JsonNode root = mapper.readTree(data);
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// Make sure the JSON is an object, as said in their documents
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assert root.isObject();
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// Read the "Meta Data" property of JSON object
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JsonNode metadata = root.get("Meta Data");
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assert metadata.isObject();
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// Read "2. Symbol" property of "Meta Data" property
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if (metadata.get("2. Symbol").isValueNode()) {
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System.out.println(metadata.get("2. Symbol").asText());
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}
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// Print "4. Time Zone" property of "Meta Data" property of root JSON object
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System.out.println(root.at("/Meta Data/4. Time Zone").asText());
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// Read "Weekly Time Series" property of root JSON object
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Iterator<String> dates = root.get("Weekly Time Series").fieldNames();
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while(dates.hasNext()) {
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// Read the first date's open price
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String n = root.at("/Weekly Time Series/" + dates.next() + "/1. open").asText();
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System.out.println(Double.parseDouble(n));
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// remove break if you wan't to print all the open prices.
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break;
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}
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}

Diff for: ‎target/classes/META-INF/MANIFEST.MF

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Manifest-Version: 1.0
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Built-By: james
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Build-Jdk: 1.8.0_102
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Created-By: Maven Integration for Eclipse
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Diff for: ‎target/classes/META-INF/maven/edu.albany.mingying/CallAPI2/pom.properties

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#Generated by Maven Integration for Eclipse
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#Mon Nov 20 13:07:25 EST 2017
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version=0.0.1-SNAPSHOT
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groupId=edu.albany.mingying
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m2e.projectName=CallAPI2
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m2e.projectLocation=/Users/james/Library/Mobile Documents/com~apple~CloudDocs/Fall 2017/SoftwareEngineering/Projects/CallAPI2
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artifactId=CallAPI2

Diff for: ‎target/classes/META-INF/maven/edu.albany.mingying/CallAPI2/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>edu.albany.mingying</groupId>
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<artifactId>CallAPI2</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>CallAPI2</name>
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<url>http://maven.apache.org</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.glassfish.jersey.core</groupId>
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<artifactId>jersey-client</artifactId>
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<version>2.26</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish.jersey.inject</groupId>
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<artifactId>jersey-hk2</artifactId>
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<version>2.26</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.9.2</version>
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</dependency>
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</dependencies>
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</project>

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