尝试使用Java中的Gmail API发送电子邮件时出错 [英] Error when trying to send an email using Gmail API in Java

问题描述

我想使用Gmail API（而不是JavaMail）发送电子邮件。我在论坛上阅读了很多类似的主题，但我仍然有一个问题。

I want to send an email using Gmail API (not JavaMail). I read many similar topics on forums, but I have still a problem.

首先我读到： https://developers.google.com/gmail/api/guides/sending

并且我引用了方法：MimeMessage createEmail，Message createMessageWithEmail和Message sendMessage

and I impelemented methods: MimeMessage createEmail, Message createMessageWithEmail and Message sendMessage

然后我注意到我没有对象Gmail服务的定义，所以我需要一个类GmailQuickstart，在这里： https://developers.google.com/gmail/api/quickstart/java

Then I noticed that I don't have definition of object Gmail service, so I needed a class GmailQuickstart, which is here: https://developers.google.com/gmail/api/quickstart/java

我实现了：类GmailQuickstart，方法Credential Authorize（）和方法Gmail getGmailService（）

and I implemented: class GmailQuickstart, method Credential authorize() and method Gmail getGmailService()

最后我写了一个main：

Finally I wrote a main:

public static void main(final String[] args) throws MessagingException, IOException {
    String APPLICATION_NAME = "gmailProject";
    HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
    JsonFactory JSON_FACTORY = new JacksonFactory();
    Credential credential = GmailQuickstart.authorize();

    String to = "[e-mail]";
    String from = "[e-mail]";
    String subject = "Subject";
    String bodyText = "Body";
    MimeMessage emailcontent = createEmail(to, from, subject, bodyText);
    createMessageWithEmail(emailcontent);
    Gmail service = new com.google.api.services.gmail.Gmail.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME).build();
    sendMessage(service, "me", emailcontent);
}

此后我有一长串错误：

Exception in thread "main"com.google.api.client.googleapis. json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
  "domain" : "global",
  "message" : "Insufficient Permission",
  "reason" : "insufficientPermissions"
} ],
"message" : "Insufficient Permission"
}
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJs nResponseException.java:146)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1065)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
    at org.actuarlib.outsourcing.mail.Mail.sendMessage(Mail.java:78)
    at org.actuarlib.outsourcing.mail.Mail.main(Mail.java:195)

我知道堆栈上有很多关于类似的主题错误，但我不知道如何纠正它。
任何人都可以告诉我有什么问题，或者您是否知道使用Gmail API发送电子邮件的另一种方式？

I know that on stack there are many topics about similar error, but I don't know how to correct it. Anyone can tell me what's wrong or do you know another way to send an email using Gmail API?

推荐答案

问题是您在授权不足的情况下进行授权。这行代码是问题：

The problem is that you have authorized with insufficient permission. This line of code is the problem:

private static final List<String> SCOPES =
        Arrays.asList(GmailScopes.GMAIL_LABELS);

如果您查看列出标签，您将看到权限 https://www.googleapis.com /auth/gmail.labels 是足够的。

If you check the reference for listing labels, you will see that the permission https://www.googleapis.com/auth/gmail.labels is enough.

然而，这不足以用于发送消息。您可以在开发过程中更改您的SCOPES以包含 https://mail.google.com/ ，直到您确切知道所需的权限：

This is however not sufficient for sending messages. You can change your SCOPES to include https://mail.google.com/ while developing, until you know exactly what permission you need:

private static final List<String> SCOPES =
        Arrays.asList(GmailScopes.MAIL_GOOGLE_COM);

这篇关于尝试使用Java中的Gmail API发送电子邮件时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！