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샌드그리드를 사용하여 예전부터 이메일을 보내고 있었는데 최근들어 예전 API가 이메일을 발송하지 않아 아무래도 문제가 있는것 같아 새로운 API로 바꾸게 되었다.

사용자 입장에서는 모든게  다 바뀌었고 5-6년전부터 쓰던 API는 하나도 같은게 없었다.  아래의 내용은 샘플과 함께 문제점이 있던것을 고친 내용들이다.

•  java API jar file download : https://github.com/sendgrid/sendgrid-java/releases/download/4.7.2/sendgrid-java.jar
•  위의 jar file 만 따로 받아서 사용하면 되는데 그렇게 하면   아래의  error가   런타임에 생긴다.
• java.lang.SecurityException: Invalid signature file digest for Manifest main attributes    .
•  이럴때는 가장 쉬운 방법으로는    각종 zip 관련  도구로 META-INT folder 로들어가서  *SF,*.DSF,*RSA 파일들을 모두 지우고 jar 파일을 세이브하면 된다. 아니면 https://github.com/sendgrid/sendgrid-java 에서 코드를 다운받아서  jar 파일을 빌드할때  사이닝 관련된 파일들을 아래와 같이 제외 시킨다.

Maven:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.6</version>
    <executions>
        <execution>
            <id>unpack-dependencies</id>
            <phase>package</phase>
            <goals>
                <goal>unpack-dependencies</goal>
            </goals>
            <configuration>
                <excludeScope>system</excludeScope>
                <excludes>META-INF/*.SF</excludes>
                <excludes>META-INF/*.DSA</excludes>
                <excludes>META-INF/*.RSA</excludes>
                <excludeGroupIds>junit,org.mockito,org.hamcrest</excludeGroupIds>
                <outputDirectory>${project.build.directory}/classes</outputDirectory>
            </configuration>
        </execution>
    </executions>
</plugin>

ANT:

1. <jar destfile="app.jar" basedir="${classes.dir}">
   <zipfileset excludes="META-INF/**/*" src="${lib.dir}/bcprov-jdk16-145.jar"></zipfileset>
   <manifest>
   <attribute name="Main-Class" value="app.Main"/>
   </manifest>
   </jar>

   다음은 간단한 샘플 코드들이이다. Personalization을 사용하여 여러 사람들한테 보내거나 BCC등 예전과는 많이 다른 모습을 보인다. 물론 기본적으로 디렉트 API 에서 웹서비스 API로 바뀐게 확연히 들어난다. 

2. 	import com.sendgrid.Method;
   	import com.sendgrid.Request;
   	import com.sendgrid.Response;
   	import com.sendgrid.SendGrid;
   	import com.sendgrid.helpers.mail.Mail;
   	import com.sendgrid.helpers.mail.objects.*;
   	import java.io.IOException;
   	public class Example {
   	// Fully populated Mail object
   	public static Mail buildKitchenSink() {
   	Mail mail = new Mail();
   	Email fromEmail = new Email();
   	fromEmail.setName(“Example User“);
   	fromEmail.setEmail(“test@example.com“);
   	mail.setFrom(fromEmail);
   	mail.setSubject(“Hello World from the Twilio SendGrid Java Library“);
   	Personalization personalization = new Personalization();
   	Email to = new Email();
   	to.setName(“Example User“);
   	to.setEmail(“test1@example.com“);
   	personalization.addTo(to);
   	to.setName(“Example User“);
   	to.setEmail(“test2@example.com“);
   	personalization.addTo(to);
   	Email cc = new Email();
   	cc.setName(“Example User“);
   	cc.setEmail(“test3@example.com“);
   	personalization.addCc(cc);
   	cc.setName(“Example User“);
   	cc.setEmail(“test4@example.com“);
   	personalization.addCc(cc);
   	Email bcc = new Email();
   	bcc.setName(“Example User“);
   	bcc.setEmail(“test5@example.com“);
   	personalization.addBcc(bcc);
   	bcc.setName(“Example User“);
   	bcc.setEmail(“test6@example.com“);
   	personalization.addBcc(bcc);
   	personalization.setSubject(“Hello World from the Personalized Twilio SendGrid Java Library“);
   	personalization.addHeader(“X-Test“, “test“);
   	personalization.addHeader(“X-Mock“, “true“);
   	personalization.addSubstitution(“%name%“, “Example User“);
   	personalization.addSubstitution(“%city%“, “Riverside“);
   	personalization.addCustomArg(“user_id“, “343“);
   	personalization.addCustomArg(“type“, “marketing“);
   	personalization.setSendAt(1443636843);
   	mail.addPersonalization(personalization);
   	Personalization personalization2 = new Personalization();
   	Email to2 = new Email();
   	to2.setName(“Example User“);
   	to2.setEmail(“test1@example.com“);
   	personalization2.addTo(to2);
   	to2.setName(“Example User“);
   	to2.setEmail(“test2@example.com“);
   	personalization2.addTo(to2);
   	Email cc2 = new Email();
   	cc2.setName(“Example User“);
   	cc2.setEmail(“test3@example.com“);
   	personalization2.addCc(cc2);
   	cc2.setName(“Example User“);
   	cc2.setEmail(“test4@example.com“);
   	personalization2.addCc(cc2);
   	Email bcc2 = new Email();
   	bcc2.setName(“Example User“);
   	bcc2.setEmail(“test5@example.com“);
   	personalization2.addBcc(bcc2);
   	bcc2.setName(“Example User“);
   	bcc2.setEmail(“test6@example.com“);
   	personalization2.addBcc(bcc2);
   	personalization2.setSubject(“Hello World from the Personalized Twilio SendGrid Java Library“);
   	personalization2.addHeader(“X-Test“, “test“);
   	personalization2.addHeader(“X-Mock“, “true“);
   	personalization2.addSubstitution(“%name%“, “Example User“);
   	personalization2.addSubstitution(“%city%“, “Denver“);
   	personalization2.addCustomArg(“user_id“, “343“);
   	personalization2.addCustomArg(“type“, “marketing“);
   	personalization2.setSendAt(1443636843);
   	mail.addPersonalization(personalization2);
   	Content content = new Content();
   	content.setType(“text/plain“);
   	content.setValue(“some text here“);
   	mail.addContent(content);
   	content.setType(“text/html“);
   	content.setValue(“<html><body>some text here</body></html>“);
   	mail.addContent(content);
   	Attachments attachments = new Attachments();
   	attachments.setContent(“TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNlY3RldHVyIGFkaXBpc2NpbmcgZWxpdC4gQ3JhcyBwdW12“);
   	attachments.setType(“application/pdf“);
   	attachments.setFilename(“balance_001.pdf“);
   	attachments.setDisposition(“attachment“);
   	attachments.setContentId(“Balance Sheet“);
   	mail.addAttachments(attachments);
   	Attachments attachments2 = new Attachments();
   	attachments2.setContent(“BwdW“);
   	attachments2.setType(“image/png“);
   	attachments2.setFilename(“banner.png“);
   	attachments2.setDisposition(“inline“);
   	attachments2.setContentId(“Banner“);
   	mail.addAttachments(attachments2);
   	mail.setTemplateId(“13b8f94f-bcae-4ec6-b752-70d6cb59f932“);
   	mail.addSection(“%section1%“, “Substitution Text for Section 1“);
   	mail.addSection(“%section2%“, “Substitution Text for Section 2“);
   	mail.addHeader(“X-Test1“, “1“);
   	mail.addHeader(“X-Test2“, “2“);
   	mail.addCategory(“May“);
   	mail.addCategory(“2016“);
   	mail.addCustomArg(“campaign“, “welcome“);
   	mail.addCustomArg(“weekday“, “morning“);
   	mail.setSendAt(1443636842);
   	ASM asm = new ASM();
   	asm.setGroupId(99);
   	asm.setGroupsToDisplay(new int[]{4, 5, 6, 7, 8});
   	mail.setASM(asm);
   	// This must be a valid [batch ID](https://sendgrid.com/docs/API_Reference/SMTP_API/scheduling_parameters.html) to work
   	// mail.setBatchId(“sendgrid_batch_id”);
   	mail.setIpPoolId(“23“);
   	MailSettings mailSettings = new MailSettings();
   	BccSettings bccSettings = new BccSettings();
   	bccSettings.setEnable(true);
   	bccSettings.setEmail(“test@example.com“);
   	mailSettings.setBccSettings(bccSettings);
   	Setting sandBoxMode = new Setting();
   	sandBoxMode.setEnable(true);
   	mailSettings.setSandboxMode(sandBoxMode);
   	Setting bypassListManagement = new Setting();
   	bypassListManagement.setEnable(true);
   	mailSettings.setBypassListManagement(bypassListManagement);
   	FooterSetting footerSetting = new FooterSetting();
   	footerSetting.setEnable(true);
   	footerSetting.setText(“Footer Text“);
   	footerSetting.setHtml(“<html><body>Footer Text</body></html>“);
   	mailSettings.setFooterSetting(footerSetting);
   	SpamCheckSetting spamCheckSetting = new SpamCheckSetting();
   	spamCheckSetting.setEnable(true);
   	spamCheckSetting.setSpamThreshold(1);
   	spamCheckSetting.setPostToUrl(“https://spamcatcher.sendgrid.com“);
   	mailSettings.setSpamCheckSetting(spamCheckSetting);
   	mail.setMailSettings(mailSettings);
   	TrackingSettings trackingSettings = new TrackingSettings();
   	ClickTrackingSetting clickTrackingSetting = new ClickTrackingSetting();
   	clickTrackingSetting.setEnable(true);
   	clickTrackingSetting.setEnableText(true);
   	trackingSettings.setClickTrackingSetting(clickTrackingSetting);
   	OpenTrackingSetting openTrackingSetting = new OpenTrackingSetting();
   	openTrackingSetting.setEnable(true);
   	openTrackingSetting.setSubstitutionTag(“Optional tag to replace with the open image in the body of the message“);
   	trackingSettings.setOpenTrackingSetting(openTrackingSetting);
   	SubscriptionTrackingSetting subscriptionTrackingSetting = new SubscriptionTrackingSetting();
   	subscriptionTrackingSetting.setEnable(true);
   	subscriptionTrackingSetting.setText(“text to insert into the text/plain portion of the message“);
   	subscriptionTrackingSetting.setHtml(“<html><body>html to insert into the text/html portion of the message</body></html>“);
   	subscriptionTrackingSetting.setSubstitutionTag(“Optional tag to replace with the open image in the body of the message“);
   	trackingSettings.setSubscriptionTrackingSetting(subscriptionTrackingSetting);
   	GoogleAnalyticsSetting googleAnalyticsSetting = new GoogleAnalyticsSetting();
   	googleAnalyticsSetting.setEnable(true);
   	googleAnalyticsSetting.setCampaignSource(“some source“);
   	googleAnalyticsSetting.setCampaignTerm(“some term“);
   	googleAnalyticsSetting.setCampaignContent(“some content“);
   	googleAnalyticsSetting.setCampaignName(“some name“);
   	googleAnalyticsSetting.setCampaignMedium(“some medium“);
   	trackingSettings.setGoogleAnalyticsSetting(googleAnalyticsSetting);
   	mail.setTrackingSettings(trackingSettings);
   	Email replyTo = new Email();
   	replyTo.setName(“Example User“);
   	replyTo.setEmail(“test@example.com“);
   	mail.setReplyTo(replyTo);
   	return mail;
   	}
   	// API V3 Dynamic Template implementation
   	public static Mail buildDynamicTemplate() {
   	Mail mail = new Mail();
   	Email fromEmail = new Email();
   	fromEmail.setName(“Example User“);
   	fromEmail.setEmail(“test@example.com“);
   	mail.setFrom(fromEmail);
   	mail.setTemplateId(“d-c6dcf1f72bdd4beeb15a9aa6c72fcd2c“);
   	Personalization personalization = new Personalization();
   	personalization.addDynamicTemplateData(“name“, “Example User“);
   	personalization.addDynamicTemplateData(“city“, “Denver“);
   	personalization.addTo(new Email(“test@example.com“));
   	mail.addPersonalization(personalization);
   	return mail;
   	}
   	// Minimum required to send an email
   	public static Mail buildHelloEmail() {
   	Email from = new Email(“test@example.com“);
   	String subject = “Hello World from the Twilio SendGrid Java Library“;
   	Email to = new Email(“test@example.com“);
   	Content content = new Content(“text/plain“, “some text here“);
   	// Note that when you use this constructor an initial personalization object
   	// is created for you. It can be accessed via
   	// mail.personalization.get(0) as it is a List object
   	Mail mail = new Mail(from, subject, to, content);
   	Email email = new Email(“test2@example.com“);
   	mail.personalization.get(0).addTo(email);
   	return mail;
   	}
   	public static void baselineExample() throws IOException {
   	final Mail helloWorld = buildHelloEmail();
   	send(helloWorld);
   	}
   	public static void kitchenSinkExample() throws IOException {
   	final Mail kitchenSink = buildKitchenSink();
   	send(kitchenSink);
   	}
   	public static void dynamicTemplateExample() throws IOException {
   	final Mail dynamicTemplate = buildDynamicTemplate();
   	send(dynamicTemplate);
   	}
   	private static void send(final Mail mail) throws IOException {
   	final SendGrid sg = new SendGrid(System.getenv(“SENDGRID_API_KEY“));
   	sg.addRequestHeader(“X-Mock“, “true“);
   	final Request request = new Request();
   	request.setMethod(Method.POST);
   	request.setEndpoint(“mail/send“);
   	request.setBody(mail.build());
   	final Response response = sg.api(request);
   	System.out.println(response.getStatusCode());
   	System.out.println(response.getBody());
   	System.out.println(response.getHeaders());
   	}
   	public static void main(String[] args) throws IOException {
   	baselineExample();
   	kitchenSinkExample();
   	dynamicTemplateExample();
   	}
   	}