Merge pull request #2966 from hugosama1/googlehttpclient

BAEL-1260 A Guide to google-http-client

libraries/pom.xml

@@ -622,6 +622,21 @@
 	    <artifactId>bcpkix-jdk15on</artifactId>
 	    <version>1.58</version>
 	</dependency>
+        <dependency>
+            <groupId>com.google.http-client</groupId>
+            <artifactId>google-http-client</artifactId>
+            <version>${googleclient.version}</version>
+        </dependency>
+        <dependency>
+          <groupId>com.google.http-client</groupId>
+          <artifactId>google-http-client-jackson2</artifactId>
+            <version>${googleclient.version}</version>
+        </dependency>
+        <dependency>
+        <groupId>com.google.http-client</groupId>
+        <artifactId>google-http-client-gson</artifactId>
+        <version>${googleclient.version}</version>
+      </dependency>
     </dependencies>
     <repositories>
         <repository>
@@ -639,6 +654,7 @@
         </repository>
     </repositories>
     <properties>
+        <googleclient.version>1.23.0</googleclient.version>
         <crdt.version>0.1.0</crdt.version>
         <multiverse.version>0.7.0</multiverse.version>
         <cglib.version>3.2.4</cglib.version>

libraries/src/main/java/com/baeldung/googlehttpclientguide/GitHubExample.java

@@ -0,0 +1,65 @@
+package com.baeldung.googlehttpclientguide;
+
+import com.google.api.client.http.HttpBackOffUnsuccessfulResponseHandler;
+import com.google.api.client.http.HttpRequest;
+import com.google.api.client.http.HttpRequestFactory;
+import com.google.api.client.http.HttpResponse;
+import com.google.api.client.http.HttpResponseException;
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.http.apache.ApacheHttpTransport;
+import com.google.api.client.http.javanet.NetHttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.JsonObjectParser;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.client.util.ExponentialBackOff;
+import com.google.gson.reflect.TypeToken;
+import java.lang.reflect.Type;
+import java.util.List;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+public class GitHubExample {
+    static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
+    //static final HttpTransport HTTP_TRANSPORT = new ApacheHttpTransport();
+    static final JsonFactory JSON_FACTORY = new JacksonFactory();
+    //static final JsonFactory JSON_FACTORY = new GsonFactory();
+
+    private static void run() throws Exception {
+        HttpRequestFactory requestFactory
+                = HTTP_TRANSPORT.createRequestFactory(
+                        (HttpRequest request) -> {
+                            request.setParser(new JsonObjectParser(JSON_FACTORY));
+                        });
+        GitHubUrl url = new GitHubUrl("https://api.github.com/users");
+        url.per_page = 10;
+        url.page = 1;
+        HttpRequest request = requestFactory.buildGetRequest(url);
+        ExponentialBackOff backoff = new ExponentialBackOff.Builder()
+                .setInitialIntervalMillis(500)
+                .setMaxElapsedTimeMillis(900000)
+                .setMaxIntervalMillis(6000)
+                .setMultiplier(1.5)
+                .setRandomizationFactor(0.5)
+                .build();
+        request.setUnsuccessfulResponseHandler(new HttpBackOffUnsuccessfulResponseHandler(backoff));
+        Type type = new TypeToken<List<User>>() {}.getType();
+        List<User> users = (List<User>)request.execute().parseAs(type);
+        System.out.println(users);
+        url.appendRawPath("/eugenp");
+        request = requestFactory.buildGetRequest(url);
+        ExecutorService executor = Executors.newSingleThreadExecutor();
+        Future<HttpResponse> responseFuture = request.executeAsync(executor);
+        User eugen = responseFuture.get().parseAs(User.class);
+        System.out.println(eugen);
+        executor.shutdown();
+    }
+
+    public static void main(String[] args) {
+        try {
+            run();
+        } catch (Exception e) {
+            System.err.println(e.getMessage());
+        }
+    }
+}

libraries/src/main/java/com/baeldung/googlehttpclientguide/GitHubUrl.java

@@ -0,0 +1,18 @@
+package com.baeldung.googlehttpclientguide;
+
+import com.google.api.client.http.GenericUrl;
+import com.google.api.client.util.Key;
+
+public class GitHubUrl extends GenericUrl{
+
+    public GitHubUrl(String encodedUrl) {
+        super(encodedUrl);
+    }    
+    
+    @Key
+    public int per_page;
+    
+    @Key
+    public int page;
+    
+}

libraries/src/main/java/com/baeldung/googlehttpclientguide/User.java

@@ -0,0 +1,77 @@
+package com.baeldung.googlehttpclientguide;
+
+import com.google.api.client.json.GenericJson;
+import com.google.api.client.util.Key;
+
+public class User extends GenericJson {
+    @Key
+    private String login;
+    @Key
+    private long id;
+    @Key
+    private String url;
+    @Key
+    private String company;
+    @Key
+    private String blog;
+    @Key
+    private String email;
+    
+    @Key("subscriptions_url")
+    private String subscriptionsUrl;
+
+    public String getLogin() {
+        return login;
+    }
+
+    public void setLogin(String login) {
+        this.login = login;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getCompany() {
+        return company;
+    }
+
+    public void setCompany(String company) {
+        this.company = company;
+    }
+
+    public String getBlog() {
+        return blog;
+    }
+
+    public void setBlog(String blog) {
+        this.blog = blog;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "login=" + login + ", id=" + id + ", url=" + url + ", company=" + company + ", blog=" + blog + ", email=" + email + '}';
+    }    
+     
+    
+}

libraries/src/main/java/com/baeldung/googlehttpclientguide/logging.properties

@@ -0,0 +1,10 @@
+# Properties file which configures the operation of the JDK logging facility.
+# The system will look for this config file to be specified as a system property: 
+# -Djava.util.logging.config.file=${project_loc:dailymotion-simple-cmdline-sample}/logging.properties
+
+# Set up the console handler (uncomment "level" to show more fine-grained messages) 
+handlers = java.util.logging.ConsoleHandler
+java.util.logging.ConsoleHandler.level = ALL
+
+# Set up logging of HTTP requests and responses (uncomment "level" to show)
+com.google.api.client.http.level = ALL