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thangpt2019thangpt2019
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add Java RESTFul client examples
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‎Java-RESTful-Client-Example/.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 excluding="**" kind="src" output="target/classes" path="src/main/resources">
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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="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 excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
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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.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
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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>

‎Java-RESTful-Client-Example/.gitignore‎

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/target/

Java RESTful Web Service Client/.project renamed to Java-RESTful-Client-Example/.project

File renamed without changes.

‎Java-RESTful-Client-Example/.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/main/resources=UTF-8
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encoding//src/test/java=UTF-8
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encoding//src/test/resources=UTF-8
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encoding/<project>=UTF-8

‎Java-RESTful-Client-Example/.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=1.8
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org.eclipse.jdt.core.compiler.compliance=1.8
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org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
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org.eclipse.jdt.core.compiler.source=1.8

‎Java-RESTful-Client-Example/.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

‎Java-RESTful-Client-Example/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>com.howtoprogram</groupId>
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<artifactId>java-restful-client-example</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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</properties>
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<dependencies>
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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>2.7.5</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.dataformat</groupId>
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<artifactId>jackson-dataformat-xml</artifactId>
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<version>2.6.3</version>
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</dependency>
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</dependencies>
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</project>

‎Java-RESTful-Client-Example/src/main/java/com/howtoprogram/restful/Book.java‎

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package com.howtoprogram.restful;
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import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
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@JacksonXmlRootElement(localName = "book")
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public class Book {
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private Long id;
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private String name;
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private String author;
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public Book() {
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super();
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}
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public Book(Long id, String name, String author) {
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super();
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this.id = id;
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this.name = name;
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this.author = author;
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}
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@Override
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public String toString() {
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return "Book [id=" + id + ", name=" + name + ", author=" + author + "]";
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}
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}

‎Java-RESTful-Client-Example/src/main/java/com/howtoprogram/restful/BookServiceImplJackson.java‎

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package com.howtoprogram.restful;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.dataformat.xml.JacksonXmlModule;
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import com.fasterxml.jackson.dataformat.xml.XmlMapper;
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public class BookServiceImplJackson {
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/**
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* Gets all {@link Book} from RESTful Web Service; then, use Jackson library to convert the JSON
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* response to Java objects
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*/
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public void getAllBooksAsJson() {
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HttpURLConnection connection = null;
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BufferedReader reader = null;
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String json = null;
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try {
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URL resetEndpoint = new URL("http://localhost:8080/v1/books");
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connection = (HttpURLConnection) resetEndpoint.openConnection();
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// Set request method to GET as required from the API
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connection.setRequestMethod("GET");
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// Read the response
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reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
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StringBuilder jsonSb = new StringBuilder();
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String line = null;
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while ((line = reader.readLine()) != null) {
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jsonSb.append(line);
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}
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json = jsonSb.toString();
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// Converts JSON string to Java object
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ObjectMapper mapper = new ObjectMapper();
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// Converts to an array of Book
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Book[] books = mapper.readValue(json, Book[].class);
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for (Book book : books) {
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System.out.println(book);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* Creates {@link Book} by posting the XML to RESTful Web Service. The XML content is converted
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* from Java object using Jackson API
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*/
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public void createBookAsXML() {
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try {
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URL url = new URL("http://localhost:8080/v1/books");
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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// Set the request method to POST as required from the API
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con.setRequestMethod("POST");
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// Set the Content-Type to "application/xml" as required from the API
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con.setRequestProperty("Content-Type", "application/xml");
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con.setDoOutput(true);
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OutputStream os = con.getOutputStream();
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// The book we want to create in JSON format
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// String book = "<book><name>Effective Java</name><author>Joshua Bloch</author></book>";
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// Creates new Book instance
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Book book = new Book(null, "Effective Java", "Joshua Bloch");
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JacksonXmlModule module = new JacksonXmlModule();
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// and then configure, for example:
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module.setDefaultUseWrapper(false);
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XmlMapper xmlMapper = new XmlMapper(module);
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System.out.println(xmlMapper.writeValueAsString(book));
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os.write(xmlMapper.writeValueAsBytes(book));
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os.flush();
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os.close();
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int responseCode = con.getResponseCode();
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System.out.println("Response Code :" + responseCode);
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if (responseCode == HttpURLConnection.HTTP_CREATED) {
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System.out.println("Created book successfully.");
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} else {
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System.out.println("Created book failed.");
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* Creates {@link Book} by posting the JSON to RESTful Web Service. The JSON content is converted
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* from Java object using Jackson API
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*/
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public void createBookAsJSON() {
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try {
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URL url = new URL("http://localhost:8080/v1/books");
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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// Set the request method to POST as required from the API
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con.setRequestMethod("POST");
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// Set the Content-Type to "application/json" as required from the API
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con.setRequestProperty("Content-Type", "application/json");
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con.setDoOutput(true);
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OutputStream os = con.getOutputStream();
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// The book we want to create in JSON format
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// String book = "{\"name\":\"Effective Java\",\"author\":\"Joshua Bloch\"}";
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// Creates new Book instance
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Book book = new Book(null, "Effective Java", "Joshua Bloch");
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ObjectMapper mapper = new ObjectMapper();
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os.write(mapper.writeValueAsBytes(book));
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os.flush();
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os.close();
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int responseCode = con.getResponseCode();
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System.out.println("Response Code :" + responseCode);
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if (responseCode == HttpURLConnection.HTTP_CREATED) {
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System.out.println("Created book successfully.");
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} else {
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System.out.println("Created book failed.");
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎Java-RESTful-Client-Example/src/main/java/com/howtoprogram/restful/BookServiceImplRaw.java‎

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package com.howtoprogram.restful;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.net.HttpURLConnection;
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import java.net.URL;
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public class BookServiceImplRaw {
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/**
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* Get all {@link Book} from RESTful Web Service
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*/
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public String getAllBooksAsJson() {
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HttpURLConnection connection = null;
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BufferedReader reader = null;
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String retVal = null;
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try {
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URL resetEndpoint = new URL("http://localhost:8080/v1/books");
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connection = (HttpURLConnection) resetEndpoint.openConnection();
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// Set request method to GET as required from the API
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connection.setRequestMethod("GET");
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// Read the response
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reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
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StringBuilder jsonSb = new StringBuilder();
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String line = null;
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while ((line = reader.readLine()) != null) {
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jsonSb.append(line);
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}
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retVal = jsonSb.toString();
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// print out the json response
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System.out.println(retVal);
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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// Clean up
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if (reader != null) {
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try {
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reader.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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if (connection != null) {
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connection.disconnect();
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}
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}
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return retVal;
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}
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/**
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* Creates {@link Book} by posting the XML to RESTful Web Service
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*/
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public void createBookAsXML() {
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try {
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URL url = new URL("http://localhost:8080/v1/books");
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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// Set the request method to POST as required from the API
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con.setRequestMethod("POST");
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// Set the Content-Type to "application/xml" as required from the API
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con.setRequestProperty("Content-Type", "application/xml");
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con.setDoOutput(true);
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OutputStream os = con.getOutputStream();
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// The book we want to create in JSON format
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String book = "<book><name>Effective Java</name><author>Joshua Bloch</author></book>";
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os.write(book.getBytes());
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os.flush();
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os.close();
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int responseCode = con.getResponseCode();
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System.out.println("Response Code :" + responseCode);
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if (responseCode == HttpURLConnection.HTTP_CREATED) {
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System.out.println("Created book successfully.");
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} else {
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System.out.println("Created book failed.");
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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/**
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* Creates {@link Book} by posting the JSON to RESTful Web Service
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*/
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public void createBookAsJSON() {
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try {
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URL url = new URL("http://localhost:8080/v1/books");
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HttpURLConnection con = (HttpURLConnection) url.openConnection();
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// Set the request method to POST as required from the API
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con.setRequestMethod("POST");
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// Set the Content-Type to "application/json" as required from the API
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con.setRequestProperty("Content-Type", "application/json");
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con.setDoOutput(true);
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OutputStream os = con.getOutputStream();
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// The book we want to create in JSON format
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String book = "{\"name\":\"Effective Java\",\"author\":\"Joshua Bloch\"}";
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os.write(book.getBytes());
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os.flush();
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os.close();
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int responseCode = con.getResponseCode();
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System.out.println("Response Code :" + responseCode);
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if (responseCode == HttpURLConnection.HTTP_CREATED) {
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System.out.println("Created book successfully.");
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} else {
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System.out.println("Created book failed.");
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

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