Add compute sendgrid example

Author: Shun Fan

compute/sendgrid/README.md

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+# Java SendGrid Email Sample for Google Compute Engine
+
+This sample demonstrates how to use [SendGrid](https://www.sendgrid.com) on
+[Google Compute Engine](https://cloud.google.com/compute/)
+
+See the [sample application documentaion][sample-docs] for more detailed
+instructions.
+
+For more information about SendGrid, see their
+[documentation](https://sendgrid.com/docs/User_Guide/index.html).
+
+[sample-docs]: https://cloud.google.com/compute/docs/tutorials/sending-mail/using-sendgrid
+
+## Setup
+
+Before you can run or deploy the sample, you will need to do the following:
+
+1. [Create a SendGrid Account](http://sendgrid.com/partner/google). As of
+   September 2015, Google users start with 25,000 free emails per month.
+1. Create a compute instance on the Google Cloud Platform Developer's Console
+1. SSH into that instance. If SSHing from the Developer's Console, switch to user managed
+   if necessary.
+1. Update packages and install required packages
+    sudo apt-get update && sudo apt-get install git-core openjdk-8-jdk maven
+1. Clone the repo
+    git clone https://github.com/shun-fan/test-compute-sendgrid.git
+1. Configure your SendGrid settings in the java class (SENDGRID_API_KEY, SENDGRID_SENDER, TO_EMAIL)
+    ./sendgrid/src/main/java/com/example/compute/sendgrid/SendEmailServlet.java
+1. Navigate back to ./sendgrid and use maven to package the class as a jar
+    mvn clean package
+1. Switch to the target directory with the jar file and enable execution on that file
+    chmod +x compute-sendgrid-1.0-SNAPSHOT-jar-with-dependencies.jar
+1. Make sure that openjdk 8 is the selected java version
+    sudo update-alternatives --config java
+1. Execute the jar file and send an email
+    java -jar compute-sendgrid-1.0-SNAPSHOT-jar-with-dependencies.jar
+

compute/sendgrid/pom.xml

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+<!-
+Copyright 2016 Google Inc. All Rights Reserved.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <packaging>jar</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <groupId>com.example.compute</groupId>
+  <artifactId>compute-sendgrid</artifactId>
+
+  <dependencies>
+    <!-- [START dependencies] -->
+    <dependency>
+      <groupId>com.sendgrid</groupId>
+      <artifactId>sendgrid-java</artifactId>
+      <version>2.2.2</version>
+    </dependency>
+    <!-- [END dependencies] -->
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <archive>
+            <manifest>
+              <mainClass>com.example.compute.sendgrid.SendEmailServlet</mainClass>
+            </manifest>
+          </archive>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <version>3.3</version>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

compute/sendgrid/src/main/java/com/example/compute/sendgrid/SendEmailServlet.java

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+/**
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.compute.sendgrid;
+
+import com.sendgrid.SendGrid;
+import com.sendgrid.SendGridException;
+
+// [START example]
+public class SendEmailServlet {
+  final static String SENDGRID_API_KEY = "YOUR-SENDGRID-API-KEY";
+  final static String SENDGRID_SENDER = "YOUR-SENDGRID-SENDER";
+  final static String TO_EMAIL = "DESTINATION-EMAIL";
+
+  public static void main(String[] args) throws SendGridException {
+
+    SendGrid sendgrid = new SendGrid(SENDGRID_API_KEY);
+    SendGrid.Email email = new SendGrid.Email();
+    email.addTo(TO_EMAIL);
+    email.setFrom(SENDGRID_SENDER);
+    email.setSubject("This is a test email");
+    email.setText("Example text body.");
+
+    SendGrid.Response response = sendgrid.send(email);
+    if (response.getCode() != 200) {
+      System.out.print(String.format("An error occured: %s", response.getMessage()));
+      return;
+    }
+    System.out.print("Email sent.");
+  }
+
+}
+// [END example]