修复 邮件监听在复杂邮件下无法识别主体内容

sms4j-Email-plugin/sms4j-Email-core/src/main/java/org/dromara/email/core/service/MonitorService.java

@@ -5,13 +5,19 @@ import org.dromara.email.comm.config.MailImapConfig;
 import org.dromara.email.comm.entity.MonitorMessage;
 import org.dromara.email.comm.errors.MailException;
 
+import javax.mail.BodyPart;
 import javax.mail.Flags;
 import javax.mail.Folder;
 import javax.mail.Message;
+import javax.mail.MessagingException;
 import javax.mail.Multipart;
 import javax.mail.Session;
 import javax.mail.Store;
 import javax.mail.search.FlagTerm;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.util.Properties;
 import java.util.Timer;
 import java.util.TimerTask;
@@ -47,7 +53,7 @@ public class MonitorService{
     private void startListening() {
         try {
             Folder inbox = store.getFolder("Inbox");
-            inbox.open(Folder.READ_ONLY);
+            inbox.open(Folder.READ_WRITE);
             Message[] messages = inbox.search(new FlagTerm(new Flags(Flags.Flag.SEEN), false));
             for (Message message : messages) {
                 MonitorMessage monitorMessage = new MonitorMessage();
@@ -57,9 +63,25 @@ public class MonitorService{
                 monitorMessage.setTitle(message.getSubject());
                 // 获取邮件的内容
                 if (message.isMimeType("text/plain")) {
-                    monitorMessage.setText(message.getContent().toString());
+                    Object content = message.getContent();
+                    if (content == null){
+                        StringBuilder stringBuilder = getStringBuilder(message);
+                        content = stringBuilder.toString();
+                    }
+                    monitorMessage.setText(content.toString());
                 } else if (message.isMimeType("multipart/*")) {
                     Multipart mp = (Multipart) message.getContent();
+                    for (int i = 0; i < mp.getCount();i++){
+                        BodyPart bodyPart = mp.getBodyPart(i);
+                        String contentType = bodyPart.getContentType().toLowerCase();
+                        if (contentType.startsWith("text/plain")) {
+                            // 纯文本内容
+                            monitorMessage.setText(bodyPart.getContent().toString());
+                        } else if (contentType.startsWith("text/html")) {
+                            // HTML内容
+                            monitorMessage.setText(bodyPart.getContent().toString());
+                        }
+                    }
                     monitorMessage.setBody(mp);
                 }
                 monitorMessage.setMessageIndex(message.getMessageNumber());
@@ -75,6 +97,20 @@ public class MonitorService{
         }
     }
 
+    private static StringBuilder getStringBuilder(Message message) throws IOException, MessagingException {
+        InputStream inputStream = message.getInputStream();
+
+        // 解析输入流以获取内容
+        StringBuilder stringBuilder = new StringBuilder();
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                stringBuilder.append(line);
+            }
+        }
+        return stringBuilder;
+    }
+
     public MonitorService start(){
         Timer timer = new Timer();
         this.timer = timer;