Add OkHttp example

spring-rest/pom.xml

@@ -118,6 +118,14 @@
             <artifactId>log4j-over-slf4j</artifactId>
         </dependency>
 
+        <!-- okhttp -->
+
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>${com.squareup.okhttp3.version}</version>
+        </dependency>
+
         <!-- test scoped -->
 
         <dependency>
@@ -320,6 +328,9 @@
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <cargo-maven2-plugin.version>1.6.0</cargo-maven2-plugin.version>
 
+        <!-- okhttp -->
+        <com.squareup.okhttp3.version>3.4.1</com.squareup.okhttp3.version>
+
     </properties>
 
 </project>

spring-rest/src/test/java/org/baeldung/okhttp/DefaultContentTypeInterceptor.java

@@ -0,0 +1,26 @@
+package org.baeldung.okhttp;
+
+import java.io.IOException;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class DefaultContentTypeInterceptor implements Interceptor {
+
+    private final String contentType;
+
+    public DefaultContentTypeInterceptor(String contentType) {
+        this.contentType = contentType;
+    }
+
+    public Response intercept(Interceptor.Chain chain) throws IOException {
+
+        Request originalRequest = chain.request();
+        Request requestWithUserAgent = originalRequest.newBuilder()
+          .header("Content-Type", contentType)
+          .build();
+
+        return chain.proceed(requestWithUserAgent);
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpFileUploadingTest.java

@@ -0,0 +1,81 @@
+package org.baeldung.okhttp;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.baeldung.okhttp.ProgressRequestWrapper;
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.MediaType;
+import okhttp3.MultipartBody;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+public class OkHttpFileUploadingTest {
+
+    private static final String BASE_URL = "http://localhost:8080/spring-rest";
+
+    @Test
+    public void whenUploadFile_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        RequestBody requestBody = new MultipartBody.Builder()
+          .setType(MultipartBody.FORM)
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
+          .build();
+
+        Request request = new Request.Builder()
+                .url(BASE_URL + "/users/upload")
+                .post(requestBody)
+                .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenGetUploadFileProgress_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        RequestBody requestBody = new MultipartBody.Builder()
+          .setType(MultipartBody.FORM)
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
+          .build();
+
+
+        ProgressRequestWrapper.ProgressListener listener = new ProgressRequestWrapper.ProgressListener() {
+
+            public void onRequestProgress(long bytesWritten, long contentLength) {
+
+                float percentage = 100f * bytesWritten / contentLength;
+                assertFalse(Float.compare(percentage, 100) > 0);
+            }
+        };
+
+        ProgressRequestWrapper countingBody = new ProgressRequestWrapper(requestBody, listener);
+
+        Request request = new Request.Builder()
+                .url(BASE_URL + "/users/upload")
+                .post(countingBody)
+                .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpGetTest.java

@@ -0,0 +1,78 @@
+package org.baeldung.okhttp;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.Callback;
+import okhttp3.HttpUrl;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class OkHttpGetTest {
+
+    private static final String BASE_URL = "http://localhost:8080/spring-rest";
+
+    @Test
+    public void whenGetRequest_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+          .url(BASE_URL + "/date")
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenGetRequestWithQueryParameter_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        HttpUrl.Builder urlBuilder = HttpUrl.parse(BASE_URL + "/ex/bars").newBuilder();
+        urlBuilder.addQueryParameter("id", "1");
+
+        String url = urlBuilder.build().toString();
+
+        Request request = new Request.Builder()
+          .url(url)
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenAsynchronousGetRequest_thenCorrect() {
+
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+          .url(BASE_URL + "/date")
+          .build();
+
+        Call call = client.newCall(request);
+
+        call.enqueue(new Callback() {
+
+            public void onResponse(Call call, Response response) throws IOException {
+                assertThat(response.code(), equalTo(200));
+            }
+
+            public void onFailure(Call call, IOException e) {
+
+            }
+        });
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpHeaderTest.java

@@ -0,0 +1,48 @@
+package org.baeldung.okhttp;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class OkHttpHeaderTest {
+
+    private static final String SAMPLE_URL = "http://www.github.com";
+
+    @Test
+    public void whenSetHeader_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+          .url(SAMPLE_URL)
+          .addHeader("Content-Type", "application/json")
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+        response.close();
+    }
+
+    @Test
+    public void whenSetDefaultHeader_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient.Builder()
+          .addInterceptor(new DefaultContentTypeInterceptor("application/json"))
+          .build();
+
+        Request request = new Request.Builder()
+          .url(SAMPLE_URL)
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+        response.close();
+    }
+
+
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpMiscTest.java

@@ -0,0 +1,107 @@
+package org.baeldung.okhttp;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import okhttp3.Cache;
+import okhttp3.Call;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class OkHttpMiscTest {
+
+    private static final String BASE_URL = "http://localhost:8080/spring-rest";
+    private static Logger logger = LoggerFactory.getLogger(OkHttpMiscTest.class);
+
+    @Test
+    public void whenSetRequestTimeout_thenFail() throws IOException {
+
+        OkHttpClient client = new OkHttpClient.Builder()
+          .readTimeout(1, TimeUnit.SECONDS)
+          .build();
+
+        Request request = new Request.Builder()
+          .url(BASE_URL + "/delay/2")  // This URL is served with a 2 second delay.
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+        response.close();
+    }
+
+    @Test
+    public void whenCancelRequest_thenCorrect() throws IOException {
+
+        ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
+
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+          .url(BASE_URL + "/delay/2")  // This URL is served with a 2 second delay.
+          .build();
+
+        final int seconds = 1;
+
+        final long startNanos = System.nanoTime();
+        final Call call = client.newCall(request);
+
+        // Schedule a job to cancel the call in 1 second.
+        executor.schedule(new Runnable() {
+            public void run() {
+
+                logger.debug("Canceling call: " + (System.nanoTime() - startNanos) / 1e9f);
+                call.cancel();
+                logger.debug("Canceled call: " + (System.nanoTime() - startNanos) / 1e9f);
+            }
+        }, seconds, TimeUnit.SECONDS);
+
+        try {
+
+            logger.debug("Executing call: " + (System.nanoTime() - startNanos) / 1e9f);
+            Response response = call.execute();
+            logger.debug("Call was expected to fail, but completed: " + (System.nanoTime() - startNanos) / 1e9f, response);
+
+        } catch (IOException e) {
+
+            logger.debug("Call failed as expected: " + (System.nanoTime() - startNanos) / 1e9f, e);
+        }
+    }
+
+    @Test
+    public void  whenSetResponseCache_thenCorrect() throws IOException {
+
+        int cacheSize = 10 * 1024 * 1024; // 10 MiB
+        File cacheDirectory = new File("src/test/resources/cache");
+        Cache cache = new Cache(cacheDirectory, cacheSize);
+
+        OkHttpClient client = new OkHttpClient.Builder()
+          .cache(cache)
+          .build();
+
+        Request request = new Request.Builder()
+          .url("http://publicobject.com/helloworld.txt")
+          .build();
+
+        Response response1 = client.newCall(request).execute();
+        logResponse(response1);
+
+        Response response2 = client.newCall(request).execute();
+        logResponse(response2);
+    }
+
+    private void logResponse(Response response) throws IOException {
+
+    	logger.debug("Response response:          " + response);
+        logger.debug("Response cache response:    " + response.cacheResponse());
+        logger.debug("Response network response:  " + response.networkResponse());
+        logger.debug("Response responseBody:      " + response.body().string());
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpPostingTest.java

@@ -0,0 +1,109 @@
+package org.baeldung.okhttp;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.Credentials;
+import okhttp3.FormBody;
+import okhttp3.MediaType;
+import okhttp3.MultipartBody;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+public class OkHttpPostingTest {
+
+    private static final String BASE_URL = "http://localhost:8080/spring-rest";
+    private static final String URL_SECURED_BY_BASIC_AUTHENTICATION = "http://browserspy.dk/password-ok.php";
+
+    @Test
+    public void whenSendPostRequest_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        RequestBody formBody = new FormBody.Builder()
+          .add("username", "test")
+          .add("password", "test")
+          .build();
+
+        Request request = new Request.Builder()
+                .url(BASE_URL + "/users")
+                .post(formBody)
+                .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenSendPostRequestWithAuthorization_thenCorrect() throws IOException {
+
+        String postBody = "test post";
+
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+                .url(URL_SECURED_BY_BASIC_AUTHENTICATION)
+                .addHeader("Authorization", Credentials.basic("test", "test"))
+                .post(RequestBody.create(MediaType.parse("text/x-markdown; charset=utf-8"), postBody))
+                .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenPostJson_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        String json = "{\"id\":1,\"name\":\"John\"}";
+
+        RequestBody body = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), json);
+
+        Request request = new Request.Builder()
+            .url(BASE_URL + "/users/detail")
+            .post(body)
+            .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+
+    @Test
+    public void whenSendMultipartRequest_thenCorrect() throws IOException {
+
+        OkHttpClient client = new OkHttpClient();
+
+        RequestBody requestBody = new MultipartBody.Builder()
+          .setType(MultipartBody.FORM)
+          .addFormDataPart("username", "test")
+          .addFormDataPart("password", "test")
+          .addFormDataPart("file", "file.txt",
+            RequestBody.create(MediaType.parse("application/octet-stream"), new File("src/test/resources/test.txt")))
+          .build();
+
+        Request request = new Request.Builder()
+            .url(BASE_URL + "/users/multipart")
+            .post(requestBody)
+            .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(200));
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/OkHttpRedirectTest.java

@@ -0,0 +1,33 @@
+package org.baeldung.okhttp;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class OkHttpRedirectTest {
+
+    @Test
+    public void whenSetFollowRedirects_thenNotRedirected() throws IOException {
+
+        OkHttpClient client = new OkHttpClient().newBuilder()
+          .followRedirects(false)
+          .build();
+
+        Request request = new Request.Builder()
+          .url("http://t.co/I5YYd9tddw")
+          .build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+
+        assertThat(response.code(), equalTo(301));
+    }
+}

spring-rest/src/test/java/org/baeldung/okhttp/ProgressRequestWrapper.java

@@ -0,0 +1,74 @@
+package org.baeldung.okhttp;
+
+import okhttp3.RequestBody;
+import okhttp3.MediaType;
+
+import java.io.IOException;
+
+import okio.Buffer;
+import okio.BufferedSink;
+import okio.ForwardingSink;
+import okio.Okio;
+import okio.Sink;
+
+public class ProgressRequestWrapper extends RequestBody {
+
+    protected RequestBody delegate;
+    protected ProgressListener listener;
+
+    protected CountingSink countingSink;
+
+    public ProgressRequestWrapper(RequestBody delegate, ProgressListener listener) {
+        this.delegate = delegate;
+        this.listener = listener;
+    }
+
+    @Override
+    public MediaType contentType() {
+        return delegate.contentType();
+    }
+
+    @Override
+    public long contentLength() throws IOException {
+        return delegate.contentLength();
+    }
+
+    @Override
+    public void writeTo(BufferedSink sink) throws IOException {
+
+        BufferedSink bufferedSink;
+
+        countingSink = new CountingSink(sink);
+        bufferedSink = Okio.buffer(countingSink);
+
+        delegate.writeTo(bufferedSink);
+
+        bufferedSink.flush();
+    }
+
+    protected final class CountingSink extends ForwardingSink {
+
+        private long bytesWritten = 0;
+
+        public CountingSink(Sink delegate) {
+            super(delegate);
+        }
+
+        @Override
+        public void write(Buffer source, long byteCount) throws IOException {
+
+            super.write(source, byteCount);
+
+            bytesWritten += byteCount;
+            listener.onRequestProgress(bytesWritten, contentLength());
+        }
+
+    }
+
+    public interface ProgressListener {
+
+        void onRequestProgress(long bytesWritten, long contentLength);
+
+    }
+}
+

spring-rest/src/test/resources/test.txt

@@ -0,0 +1 @@
+hello world