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Posting JSON with Retrofit
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‎retrofit-post-json/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>retrofit-post-json</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>retrofit-post-json</name>
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<url>http://howtoprogram.xyz/2017/02/16/how-to-post-with-retrofit-2/</url>
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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.squareup.retrofit2</groupId>
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<artifactId>retrofit</artifactId>
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<version>2.3.0</version>
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</dependency>
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<dependency>
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<groupId>com.squareup.retrofit2</groupId>
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<artifactId>converter-gson</artifactId>
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<version>2.3.0</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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</dependencies>
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</project>

‎retrofit-post-json/src/main/java/com/howtoprogram/retrofit2/Book.java‎

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package com.howtoprogram.retrofit2;
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import javax.xml.bind.annotation.XmlRootElement;
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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 and sett
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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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}

‎retrofit-post-json/src/main/java/com/howtoprogram/retrofit2/BookResource.java‎

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package com.howtoprogram.retrofit2;
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import okhttp3.MultipartBody;
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import okhttp3.RequestBody;
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import okhttp3.ResponseBody;
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import retrofit2.Call;
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import retrofit2.Callback;
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import retrofit2.http.*;
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import java.util.HashMap;
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import java.util.Map;
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public interface BookResource {
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@POST("books")
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Call<Book> createBook(@Body Book book);
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@POST("books")
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Call<Book> updateBook(@Body Map<String, Object> body);
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}

‎retrofit-post-json/src/test/java/com/howtoprogram/retrofit2/BookResourceTest.java‎

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package com.howtoprogram.retrofit2;
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import org.junit.Test;
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import retrofit2.Call;
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import retrofit2.Response;
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import retrofit2.Retrofit;
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import retrofit2.converter.gson.GsonConverterFactory;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.Map;
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import static org.junit.Assert.assertTrue;
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public class BookResourceTest {
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@Test
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public void testPostJsonByPojo() throws IOException {
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//create an instance of Retrofit
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Retrofit retrofit = new Retrofit.Builder()
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.baseUrl("http://localhost:8080/v1/")
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.addConverterFactory(GsonConverterFactory.create())
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.build();
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//create an instance of the BookResource interface
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BookResource bookResource = retrofit.create(BookResource.class);
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//create a Book object
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Book book = new Book(1l, "Java How To Program", "Paul Deitel");
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// send the Book to the Rest API
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Call<Book> call = bookResource.createBook(book);
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Response<Book> response = call.execute();
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assertTrue(response.isSuccessful());
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}
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@Test
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public void testPostJsonByMap() throws IOException {
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Retrofit retrofit = new Retrofit.Builder()
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.baseUrl("http://localhost:8080/v1/")
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.addConverterFactory(GsonConverterFactory.create())
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.build();
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BookResource bookResource = retrofit.create(BookResource.class);
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Map<String, Object> bookMap = new HashMap<>();
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bookMap.put("name", "To Kill a Mockingbird");
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bookMap.put("author", "Harper Lee");
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Call<Book> call = bookResource.updateBook(bookMap);
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Response<Book> response = call.execute();
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assertTrue(response.isSuccessful());
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}
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}

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