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使用此代码：

import java.io.*;
import java.util.*;

import javax.mail.*;

public class Mbox {
    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.setProperty("mail.store.protocol", "mstor");
        properties.setProperty("mstor.mbox.metadataStrategy", "none");
        properties.setProperty("mstor.mbox.cacheBuffers", "disabled");
        properties.setProperty("mstor.cache.disabled", "true");
        properties.setProperty("mstor.mbox.bufferStrategy", "mapped");
        properties.setProperty("mstor.metadata", "disabled");

        Session session = Session.getDefaultInstance(properties);

        try {
            Store store = session.getStore(new URLName("mstor:C:/INBOX"));
            store.connect();
            Folder inbox = store.getDefaultFolder().getFolder("inbox");
            inbox.open(Folder.READ_ONLY);
            Message m = inbox.getMessage(1);

        } catch (Exception e) {
            e.printStackTrace();

        }

        }
    }

我正在尝试在 java 中设置一个 mbox 阅读程序。我在 Linux 和 Windows 上都试过了，但每次我javax.mail.NoSuchProviderException: No provider for mstor在session.getStore("mstor:C:/INBOX"). 我搜索了一段时间并制作了如上所示的属性文件，但仍然存在错误。

javax.mail.NoSuchProviderException: No provider for mstor
    at javax.mail.Session.getProvider(Session.java:473)
    at javax.mail.Session.getStore(Session.java:547)
    at Mbox.main(Mbox.java:23)

我究竟做错了什么？

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