javamail搜索特定某一天收到的所有邮件

你可以使用JavaMail API的SearchTerm类完成这个任务。具体步骤如下：

1. 获取邮箱的Folder对象。

Store store = session.getStore("imap");
store.connect(host, username, password);
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_ONLY);

2. 创建一个SearchTerm对象并设置搜索条件。例如：

Calendar cal = Calendar.getInstance();
cal.set(2021, 6, 1); // 设置搜索日期为 2021 年 7 月 1 日
SearchTerm searchTerm = new ReceivedDateTerm(ComparisonTerm.EQ, cal.getTime());

3. 使用Folder对象的search方法进行搜索。

Message[] messages = folder.search(searchTerm);

完整代码示例：

import java.util.Calendar;
import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.search.ComparisonTerm;
import javax.mail.search.ReceivedDateTerm;
import javax.mail.search.SearchTerm;

public class SearchMailByDate {
    public static void main(String[] args) throws Exception {
        String host = "mail.example.com";
        String username = "user@example.com";
        String password = "password";

        Properties props = new Properties();
        props.put("mail.store.protocol", "imap");
        props.put("mail.imap.port", "993");
        props.put("mail.imap.ssl.enable", "true");

        Session session = Session.getInstance(props);
        Store store = session.getStore("imap");
        store.connect(host, username, password);
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);

        Calendar cal = Calendar.getInstance();
        cal.set(2021, 6, 1); // 设置搜索日期为 2021 年 7 月 1 日
        SearchTerm searchTerm = new ReceivedDateTerm(ComparisonTerm.EQ, cal.getTime());

        Message[] messages = folder.search(searchTerm);
        System.out.println("Total messages found:" + messages.length);
        for (Message message : messages) {
            System.out.println("Subject: " + message.getSubject());
            System.out.println("Received Date: " + message.getReceivedDate());
        }

        folder.close(false);
        store.close();
    }
}

注意：这里使用了ReceivedDateTerm搜索收到邮件的日期，如果你需要搜索发送日期或其他条件，请使用相应的SearchTerm类。