项目场景：

项目场景：
通过定时任务调用解析邮件，获取附件，上传到文件服务器(协助客户上传文件)，将邮件移动到相应的文件夹。以下是简单的邮件操作逻辑

本地demo代码贴贴：

由于业务场景需要，这里使用的是IMAP协议，java mail 版本是1.6.2，使用腾讯企业邮箱

package com.didadiandi.email;import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.IMAPStore;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;/*** TODO** @author wj* @date 2021/9/18 10:56**/
public class EmailTest {public static void main(String[] args) throws Exception {try (IMAPStore store = connectStore()) {Map<String, IMAPFolder> folderMap = folderMap(store);try (IMAPFolder newComingFolder = folderMap.get("NEW COMING");IMAPFolder autoUploadedFolder = folderMap.get("AUTO UPLOADED");IMAPFolder pendingCheckFolder = folderMap.get("PENDING CHECK");IMAPFolder notMatchedFolder = folderMap.get("NOT MATCHED");) {Message[] messages = newComingFolder.getMessages();Map<String, MimeMessage> mimeMessageMap = new HashMap<>();for (Message message : messages) {MimeMessage mimeMessage = (MimeMessage) message;if (mimeMessage == null) {continue;}String messageId = mimeMessage.getMessageID();mimeMessageMap.put(messageId, mimeMessage);}System.out.println(mimeMessageMap.size());for (Map.Entry<String, MimeMessage> mimeMessageEntry : mimeMessageMap.entrySet()) {MimeMessage message = mimeMessageEntry.getValue();System.out.println("\n");System.out.println(" subject:" + message.getSubject());if (!isContainAttachment(message)) {continue;}saveAttachment(message);moveMessage(newComingFolder, autoUploadedFolder, message);}} catch (Exception e) {e.printStackTrace();}} catch (Exception e) {e.printStackTrace();}}/*** 设置配置，且连接邮箱** @return com.sun.mail.imap.IMAPStore* @author wj* @date 15:16 2022/1/6*/public static IMAPStore connectStore() throws MessagingException {Properties props = new Properties();// 协议props.put("mail.store.protocol", "imap");// 要连接的imap服务器props.put("mail.imap.host", "imap.exmail.qq.com");// 端口props.put("mail.imap.port", "993");// 是否使用ssl连接并使用ssl端口(imap协议默认为false)props.put("mail.imap.ssl.enable", true);// 设置超时时间(默认无超时时间)props.put("mail.imap.timeout", "30000");// 连接超时时间(默认无超时时间)props.put("mail.imap.connectiontimeout", "30000");// 缓存消息的最大大小props.put("mail.imap.appendbuffersize", "6291456");// 是否开启分段加载功能(默认为true),附件大于100K需要加这个配置，能加快读取附件的时间props.put("mail.imap.partialfetch", "false");Session session = Session.getInstance(props, new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication("userName", "PASSWORD");}});Store store = session.getStore();store.connect();return (IMAPStore) store;}/*** 获取邮箱** @return java.util.Map<java.lang.String,com.sun.mail.imap.IMAPFolder>* @author wj* @date 15:17 2022/1/6*/public static Map<String, IMAPFolder> folderMap(IMAPStore store) throws MessagingException {Map<String, IMAPFolder> folderMap = new HashMap<>();// 带附件的邮箱文件夹IMAPFolder attachmentFolder = (IMAPFolder) openFolder(store, "NEW COMING", false);folderMap.put("NEW COMING", attachmentFolder);// 未匹配文件夹IMAPFolder unmatchedFolder = (IMAPFolder) openFolder(store, "NOT MATCHED", false);folderMap.put("NOT MATCHED", unmatchedFolder);// 上传失败文件夹IMAPFolder uploadFailedFolder = (IMAPFolder) openFolder(store, "PENDING CHECK", false);folderMap.put("PENDING CHECK", uploadFailedFolder);// 上传成功文件夹IMAPFolder uploadSuccessFolder = (IMAPFolder) openFolder(store, "AUTO UPLOADED", false);folderMap.put("AUTO UPLOADED", uploadSuccessFolder);return folderMap;}/*** 判断是否存在附件** @return boolean* @author wj* @date 15:17 2022/1/6*/public static boolean isContainAttachment(Part part) throws MessagingException, IOException, InterruptedException {// 是否包含multipart内容if (part.isMimeType("multipart/*")) {// 转换content为MimeMultipart对象MimeMultipart multipart = (MimeMultipart) part.getContent();// 获取bodyPart的数量int partCount = multipart.getCount();for (int i = 0; i < partCount; i++) {BodyPart bodyPart = multipart.getBodyPart(i);// 返回bodyPart的配置String disp = bodyPart.getDisposition();// 是否包含附件if (disp != null && (disp.equalsIgnoreCase(Part.ATTACHMENT) || disp.equalsIgnoreCase(Part.INLINE))) {return true;}}}return false;}/*** 保存附件** @param part 邮件中多个组合体中的其中一个组合体* @throws UnsupportedEncodingException* @throws MessagingException* @throws IOException*/private static void saveAttachment(Part part) throws UnsupportedEncodingException, MessagingException,IOException {System.out.println(" hashCode :" + part.hashCode());if (part.isMimeType("multipart/*")) {Multipart multipart = (Multipart) part.getContent();int partCount = multipart.getCount();for (int i = 0; i < partCount; i++) {BodyPart bodyPart = multipart.getBodyPart(i);String disp = bodyPart.getDisposition();if (disp != null) {String fileName = decodeText(bodyPart.getFileName());System.out.println(" fileName :" + fileName);// 通过getInputStream方法下载附件// bodyPart.getInputStream();}}}}/*** 获取邮箱** @return javax.mail.Folder* @author wj* @date 15:19 2022/1/6*/public static Folder openFolder(Store store, String folderName, boolean isDefaultFolder) throws MessagingException {Folder folder;try {// 获取收件箱文件夹if (isDefaultFolder) {folder = store.getFolder(folderName);} else {// 自定义邮箱文件夹Folder[] folders = store.getDefaultFolder().list();folder = findFolderByName(folders, folderName);}folder.open(Folder.READ_WRITE);return folder;} catch (MessagingException e) {store.close();e.printStackTrace();}return null;}/*** 寻找邮箱文件夹** @return javax.mail.Folder* @author wj* @date 15:00 2021/9/15*/public static Folder findFolderByName(Folder[] sourceFolder, String folderName) throws MessagingException {for (Folder folder : sourceFolder) {if (folder.getName().equals(folderName)) {return folder;} else if (folder.list().length > 0) {return findFolderByName(folder.list(), folderName);}}return null;}/*** 解析文件名称** @return java.lang.String* @author wj* @date 15:20 2022/1/6*/private static String decodeText(String encodeText) throws UnsupportedEncodingException {if (encodeText == null || "".equals(encodeText)) {return "";} else {return MimeUtility.decodeText(encodeText).replaceAll("/", "_");}}/*** 移动邮件** @return void* @author wj* @date 15:21 2022/1/6*/public static void moveMessage(IMAPFolder sourceFolder, IMAPFolder targetFolder, Message messages) throws MessagingException {if (messages == null) {return;}try {sourceFolder.moveMessages(new Message[]{messages}, targetFolder);} catch (Exception e) {throw e;}}}

问题描述：

遇到的问题：附件获取重复（测试的邮件附件名称都不一样）

// BUG原因是，for循环中调用该方法 moveMessage(newComingFolder, autoUploadedFolder, message);/*** 移动邮件** @return void* @author wj* @date 15:21 2022/1/6*/public static void moveMessage(IMAPFolder sourceFolder, IMAPFolder targetFolder, Message messages) throws MessagingException {if (messages == null) {return;}try {sourceFolder.moveMessages(new Message[]{messages}, targetFolder);} catch (Exception e) {throw e;}}

原因分析：

有两个可能：第一个可能是java mail 本身存在问题；第二个可能是腾讯企业邮箱存在问题,不支持这样操作

解决方案：

将其批量走完业务之后，再一次性调用移动邮件方法。代码如下：

    public static void main(String[] args) throws Exception {try (IMAPStore store = connectStore()) {Map<String, IMAPFolder> folderMap = folderMap(store);try (IMAPFolder newComingFolder = folderMap.get("NEW COMING");IMAPFolder autoUploadedFolder = folderMap.get("AUTO UPLOADED");IMAPFolder pendingCheckFolder = folderMap.get("PENDING CHECK");IMAPFolder notMatchedFolder = folderMap.get("NOT MATCHED");) {Message[] messages = newComingFolder.getMessages();Map<String, MimeMessage> mimeMessageMap = new HashMap<>();for (Message message : messages) {MimeMessage mimeMessage = (MimeMessage) message;if (mimeMessage == null) {continue;}String messageId = mimeMessage.getMessageID();mimeMessageMap.put(messageId, mimeMessage);}// 新增邮件处理后保存的集合List<MimeMessage> autoUploadedMessageList = Lists.newArrayList();System.out.println(mimeMessageMap.size());for (Map.Entry<String, MimeMessage> mimeMessageEntry : mimeMessageMap.entrySet()) {MimeMessage message = mimeMessageEntry.getValue();System.out.println("\n");System.out.println(" subject:" + message.getSubject());if (!isContainAttachment(message)) {continue;}saveAttachment(message);// 根据业务需求，加入集合中autoUploadedMessageList.add(message);}// 这批邮件都执行完毕之后，再移动邮件moveMessage(newComingFolder, autoUploadedFolder, autoUploadedMessageList);} catch (Exception e) {e.printStackTrace();}} catch (Exception e) {e.printStackTrace();}}/*** 移动邮件(调整过后)** @return void* @author wj* @date 15:21 2022/1/6*/public static void moveMessage(IMAPFolder sourceFolder, IMAPFolder targetFolder, List<MimeMessage> messages) throws MessagingException {if (messages == null) {return;}try {sourceFolder.moveMessages(messages.toArray(new Message[0]), targetFolder);} catch (Exception e) {throw e;}}// 也可以这样调整，但是经过评估还是使用的上面那个方法。这个方法可以在循环中调用(处理完一封邮件就"移动一封")public static void moveMessage(IMAPFolder sourceFolder, IMAPFolder targetFolder,MimeMessage messages) throws MessagingException {if (messages == null) {return;}try {sourceFolder.copyMessages(new Message[]{messages}, targetFolder);messages.setFlag(Flags.Flag.DELETED, true);} catch (Exception e) {throw e;}}

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java mail 踩坑＞＞＞批量读取附件，附件重复

项目场景：

本地demo代码贴贴：

问题描述：

原因分析：

解决方案：

java mail 踩坑＞＞＞批量读取附件，附件重复相关推荐

最新文章

热门文章

java mail 踩坑 ＞＞＞ 批量读取附件，附件重复

项目场景：

本地demo代码贴贴：

问题描述：

原因分析：

解决方案：

java mail 踩坑 ＞＞＞ 批量读取附件，附件重复相关推荐

最新文章

热门文章

java mail 踩坑＞＞＞批量读取附件，附件重复

java mail 踩坑＞＞＞批量读取附件，附件重复相关推荐