Gmail Imap - 我在办公室网络时无法连接

Question

我周末一直在家里使用Gmail-Imap-Api.它正常工作但是当我回到办公室并且在这里尝试它会抛出异常.

    Properties props = System.getProperties();
    props.put("mail.store.protocol", "imaps");
    props.put("mail.smtp.auth", "true");

    try {
        boolean debug = false;
        Authenticator auth = new SMTPAuthenticator(
                "***", "***");

        Session session = Session.getInstance(props, auth);
        session.setDebug(debug);
        Store store = session.getStore("imaps");
        store.connect("imap.gmail.com", "***@gmail.com",
                "****");
    ......
    ......

这在家庭netwrok工作正常.现在我想我会添加代理并添加这些代码行.

    System.setProperty("http.proxyHost", "****.com");
    System.setProperty("http.proxyPort", "8080");

它仍然没有用,例外是.

com.google.code.javax.mail.MessagingException: imap.gmail.com;
nested exception is:
java.net.UnknownHostException: imap.gmail.com
at com.google.code.com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
at com.google.code.javax.mail.Service.connect(Service.java:295)
at com.google.code.javax.mail.Service.connect(Service.java:176)
at openReports.OpenReportsProject.main(OpenReportsProject.java:43)
Caused by: java.net.UnknownHostException: imap.gmail.com
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:367)
at java.net.Socket.connect(Socket.java:524)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:545)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
at com.google.code.com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.google.code.com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.google.code.com.sun.mail.iap.Protocol.<init>(Protocol.java:113)
at com.google.code.com.sun.mail.imap.protocol.IMAPProtocol.<init>(IMAPProtocol.java:110)
at com.google.code.com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:632)
... 3 more

Answer 1

您输入的代理设置仅适用于HTTP连接.IMAP是在不同端口上运行的不同协议(在这种情况下为993).如果您位于防火墙后面,则防火墙需要允许连接到外部主机:端口和协议.您需要向网络管理员请求此操作.设置完成后,您将能够使用指定的协议与默认/指定端口上的Gmail Imap服务器通信.