javamail接收邮件，设置已读时报错

[assser111]

使用IMAP协议接收邮件，服务器连接，邮件读取都正常，但是运行到messages.setFlag(Flags.Flag.SEEN, true); 这一步时就会报错。错误代码如下：
Exception in thread "main" javax.mail.MessagingException: A6 NO STORE State error;
nested exception is:
com.sun.mail.iap.CommandFailedException: A6 NO STORE State error
at com.sun.mail.imap.IMAPMessage.setFlags(IMAPMessage.java:858)
at javax.mail.Message.setFlag(Message.java:574)
at com.MailReceive.main(MailReceive.java:59)
Caused by: com.sun.mail.iap.CommandFailedException: A6 NO STORE State error
at com.sun.mail.iap.Protocol.handleResult(Protocol.java:336)
at com.sun.mail.imap.protocol.IMAPProtocol.storeFlags(IMAPProtocol.java:1373)
at com.sun.mail.imap.protocol.IMAPProtocol.storeFlags(IMAPProtocol.java:1358)
at com.sun.mail.imap.IMAPMessage.setFlags(IMAPMessage.java:854)
... 2 more
希望大家帮忙看下是什么原因。

[做一个有理想的码农]

没看出来错误原因。我这有个imap写的方法 你参考下吧

package com.email;

import java.util.Properties;

import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;

import com.sun.mail.imap.IMAPFolder;
import com.sun.mail.imap.IMAPStore;


/**
 * 使用imap协议获取未读邮件数
 * @author abc
 *
 */
public class GetEmailImap {

	public static void main(String[] args) throws Exception {
		String user = "***@163.com";// 邮箱的用户名
		String password = "***"; // 邮箱的密码

		Properties prop = System.getProperties();
		prop.put("mail.store.protocol", "imap");
		prop.put("mail.imap.host", "imap.163.com");

		Session session = Session.getInstance(prop);

		int total = 0;
		IMAPStore store = (IMAPStore) session.getStore("imap"); // 使用imap会话机制，连接服务器
		store.connect(user, password);
		IMAPFolder folder = (IMAPFolder) store.getFolder("INBOX"); // 收件箱
		folder.open(Folder.READ_WRITE);
		// 获取总邮件数
		total = folder.getMessageCount();
		System.out.println("-----------------共有邮件：" + total
				+ " 封--------------");
		// 得到收件箱文件夹信息，获取邮件列表
		System.out.println("未读邮件数：" + folder.getUnreadMessageCount());
		Message[] messages = folder.getMessages();
		int messageNumber = 0;
		
		
		/*if(messages[total - 1].getSubject().equals("delete")){
			System.out.println("delete!!!!");
		
		}*/
		for (Message message : messages) {

			Flags flags = message.getFlags();
			if (flags.contains(Flags.Flag.SEEN)) {
				 System.out.println("已读邮件");
				 System.out.println("发送时间：" + message.getSentDate());
				 System.out.println("主题：" + message.getSubject());
				 System.out.println("内容：" + message.getContent());
			} else {
				System.out.println("未读邮件");
				System.out.println("发送时间：" + message.getSentDate());
				System.out.println("主题：" + message.getSubject());
				System.out.println("内容：" + message.getContent());
			}
			
			// 每封邮件都有一个MessageNumber，可以通过邮件的MessageNumber在收件箱里面取得该邮件
			messageNumber = message.getMessageNumber();
		}
		Message message = folder.getMessage(messageNumber);
		System.out.println(message.getContent() + message.getContentType());
		// 释放资源
		if (folder != null)
			folder.close(true);
		if (store != null)
			store.close();
	}

}

[dy7766]

folder.open(Folder.READ_WRITE); 设置错误了吧 你应该是设置成READ_ONLY了