feat: schedule image insert into email content

Author: xiaohuangdou666

server/src/main/java/datart/server/job/EmailJob.java

@@ -25,17 +25,23 @@
 import org.springframework.mail.javamail.MimeMessageHelper;
 import org.springframework.util.CollectionUtils;
 
+import javax.imageio.ImageIO;
 import javax.mail.MessagingException;
 import javax.mail.internet.MimeMessage;
+import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 @Slf4j
 public class EmailJob extends ScheduleJob {
 
     private final MailService mailService;
 
+    private final String imageHtml = "<image src='cid:$CID$' style='width:100%;height:auto;max-width:100%;display:block'>";
+
     public EmailJob() {
         mailService = Application.getBean(MailService.class);
     }
@@ -51,10 +57,17 @@ private MimeMessage createMailMessage(ScheduleJobConfig config, List<File> attac
         MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, !CollectionUtils.isEmpty(attachments));
         helper.setSubject(config.getSubject());
         helper.setTo(config.getTo() == null ? null : config.getTo().split(";"));
-        helper.setText(config.getTextContent(), true);
         if (StringUtils.isNotBlank(config.getCc())) {
             helper.setCc(config.getCc() == null ? null : config.getCc().split(";"));
         }
+        //图片插入正文
+        List<File> images = filterImages(attachments);
+        String imageStr = images.stream().map(item -> imageHtml.replace("$CID$",item.getName())).collect(Collectors.joining());
+        helper.setText(config.getTextContent()+imageStr, true);
+        for (File image : images) {
+            helper.addInline(image.getName(), image);
+        }
+
         if (!CollectionUtils.isEmpty(attachments)) {
             for (File file : attachments) {
                 helper.addAttachment(file.getName(), file);
@@ -63,5 +76,25 @@ private MimeMessage createMailMessage(ScheduleJobConfig config, List<File> attac
         return mimeMessage;
     }
 
+    /**
+     * 筛选图片文件
+     * @param files
+     * @return
+     */
+    private List<File> filterImages(List<File> files) {
+        List<File> images = new ArrayList<>();
+        for (File file : files) {
+            try {
+                BufferedImage image = ImageIO.read(file);
+                if (image == null || image.getWidth() <= 0 || image.getHeight() <= 0) {
+                    continue;
+                }
+                images.add(file);
+            } catch (Exception e) {}
+        }
+        files.removeAll(images);
+        return images;
+    }
+
 
 }