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Netflix Feign with Spring Cloud Example
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‎feign-spring-cloud-example/README.md‎

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# Netflix Feign with Spring Cloud Example
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## 1. Import source code into Eclipse
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Menu **File –> Import –> Maven –> Existing Maven Projects**
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Browse to your source code location
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Click **Finish** button to finish the importing
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## 2. Run Book RESTful Web Services
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Open the **Application.java**
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**Right click -> Run As -> Java Application** or use the shortcut: **Alt+Shift+x, j** to start the main method
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## 3. Run the Netflix Feign with Spring Cloud Example
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Open spring-boot-netflix-feign-example\src\test\java\com\howtoprogram\ApplicationTests.java
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Right Click --> Run As --> JUnit test
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This RESTful ws provides API for all below sub projects:
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###[Simple Java REST Client Using java.net.URL package]

‎feign-spring-cloud-example/book-restful-service/.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/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>

‎feign-spring-cloud-example/book-restful-service/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>book-restful-service</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>

‎feign-spring-cloud-example/book-restful-service/.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/<project>=UTF-8

‎feign-spring-cloud-example/book-restful-service/.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

‎feign-spring-cloud-example/book-restful-service/.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

‎feign-spring-cloud-example/book-restful-service/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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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>book-restful-service</artifactId>
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<version>0.1.0</version>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.3.5.RELEASE</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.jayway.jsonpath</groupId>
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<artifactId>json-path</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>spring-releases</id>
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<url>https://repo.spring.io/libs-release</url>
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</repository>
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</repositories>
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<pluginRepositories>
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<pluginRepository>
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<id>spring-releases</id>
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<url>https://repo.spring.io/libs-release</url>
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</pluginRepository>
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</pluginRepositories>
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</project>

‎feign-spring-cloud-example/book-restful-service/src/main/java/Application.java‎

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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.ComponentScan;
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@SpringBootApplication
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@ComponentScan({"com.howtoprogram.book", "com.howtoprogram.service"})
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎feign-spring-cloud-example/book-restful-service/src/main/java/com/howtoprogram/book/Book.java‎

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package com.howtoprogram.book;
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import javax.xml.bind.annotation.XmlRootElement;
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@XmlRootElement(name = "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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}
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// getter
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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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/**
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* @return the id
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*/
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public Long getId() {
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return id;
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}
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/**
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* @param id the id to set
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*/
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public void setId(Long id) {
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this.id = id;
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}
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/**
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* @return the name
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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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/**
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* @param name the name to set
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*/
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public void setName(String name) {
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this.name = name;
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}
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/**
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* @return the author
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*/
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public String getAuthor() {
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return author;
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}
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/**
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* @param author the author to set
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*/
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public void setAuthor(String author) {
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this.author = author;
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Object#toString()
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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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}

‎feign-spring-cloud-example/book-restful-service/src/main/java/com/howtoprogram/book/BookController.java‎

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package com.howtoprogram.book;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Optional;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.PathVariable;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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@RequestMapping(value = "/v1")
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public class BookController {
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private static List<Book> books = new ArrayList<>();
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public BookController() {
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books.add(new Book(1l, "Java How To Program", "Paul Deitel"));
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books.add(new Book(2l, "Thinking in Java", "Bruce Eckel"));
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}
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@RequestMapping(value = "/books", method = RequestMethod.GET)
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public ResponseEntity<Iterable<Book>> getAllBooks() {
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return new ResponseEntity<>(books, HttpStatus.OK);
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}
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@RequestMapping(value = "/books", method = RequestMethod.POST)
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public ResponseEntity<Book> createBook(@RequestBody Book book) {
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books.add(book);
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book.setId(Long.valueOf(books.size() + 1));
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System.out.println(book);
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return new ResponseEntity<>(book, HttpStatus.CREATED);
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}
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@RequestMapping(value = "/books/{id}")
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public ResponseEntity<Book> readBook(@PathVariable("id") Long id) {
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Optional<Book> fBook = books.stream().filter(b -> b.getId().equals(id))
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.distinct()
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.findFirst();
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if (fBook.isPresent()) {
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return new ResponseEntity<>(fBook.get(), HttpStatus.OK);
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} else {
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return new ResponseEntity<>(HttpStatus.NOT_FOUND);
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}
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}
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@RequestMapping(value = "/books/{id}", method = RequestMethod.DELETE)
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public ResponseEntity<Book> deleteBook(@PathVariable("id") Long id) {
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boolean found = false;
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for (Iterator<Book> i = books.iterator(); i.hasNext();) {
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Book item = i.next();
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if (item.getId().equals(id)) {
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i.remove();
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found = true;
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break;
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}
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}
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if (!found) {
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return new ResponseEntity<Book>(HttpStatus.NOT_FOUND);
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}
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return new ResponseEntity<Book>(HttpStatus.NO_CONTENT);
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}
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@RequestMapping(value = "/books/{id}", method = RequestMethod.PUT)
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public ResponseEntity<Book> updateBook(@PathVariable("id") Long id,
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@RequestBody Book Book) {
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Book currentBook = null;
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for (Book book : books) {
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if (book.getId().equals(id)) {
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currentBook = book;
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break;
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}
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}
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if (currentBook == null) {
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return new ResponseEntity<Book>(HttpStatus.NOT_FOUND);
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}
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currentBook.setName(Book.getName());
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currentBook.setAuthor(Book.getAuthor());
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return new ResponseEntity<Book>(currentBook, HttpStatus.OK);
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}
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}

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