java无法在internet连接上重新连接XMPP已更改

1 周，2 日 Questions & Answers 624

我正在使用asmack开发聊天应用程序。我能够建立xmpp连接，能够正确发送和接收消息。但是，如果我将互联网连接从WIFI更改为#G，反之亦然，我希望重新连接XMPP连接。为了收听连接更改，我有一个broadcastreceiver，它成功地通知连接更改。如果连接为false，则检查xmpp连接是否为null或notnull。如果它不是null，我将它设置为null。当互联网连接时，我尝试重新连接xmpp连接。主要的是我第一次启动我的应用程序，xmpp连接成功建立，TLS握手正确完成。我已将信任存储逻辑指定如下：

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    {
        connectionConfig.setTruststoreType("AndroidCAStore");
        connectionConfig.setTruststorePassword(null);
        connectionConfig.setTruststorePath(null);
    }
    else
    {
        connectionConfig.setTruststoreType("BKS");
        String path = System.getProperty("javax.net.ssl.trustStore");
        if(path == null)
        {
            path = System.getProperty("java.home") + File.separator + "etc" + File.separator + "security" + File.separator + "cacerts.bks"; 
        }
        connectionConfig.setTruststorePath(path);
    }

这是第一次正常工作，TLS握手在logcat中给出以下结果：

但是，当我尝试如上所述重新连接时，我没有像以前那样获得成功标签。相反，收到的错误如下所示：

02-19 17:59:39.098: W/System.err(21977):    java.net.SocketException: Socket closed
02-19 17:59:39.133: W/System.err(21977):    at libcore.io.Posix.sendtoBytes(Native Method)
02-19 17:59:39.133: W/System.err(21977):    at libcore.io.Posix.sendto(Posix.java:146)
02-19 17:59:39.137: W/System.err(21977):    XMPPError establishing connection with server.: remote-server-error(502) XMPPError establishing connection with server.
02-19 17:59:39.141: W/System.err(21977):    -- caused by: javax.net.ssl.SSLException: Unable to create application data
02-19 17:59:39.160: W/System.err(21977):    at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:177)
02-19 17:59:39.160: W/System.err(21977):    at libcore.io.IoBridge.sendto(IoBridge.java:473)
02-19 17:59:39.160: W/System.err(21977):    at java.net.PlainSocketImpl.write(PlainSocketImpl.java:507)
02-19 17:59:39.160: W/System.err(21977):    at java.net.PlainSocketImpl.access$100(PlainSocketImpl.java:46)
02-19 17:59:39.160: W/System.err(21977):    at java.net.PlainSocketImpl$PlainSocketOutputStream.write(PlainSocketImpl.java:269)
02-19 17:59:39.160: W/System.err(21977):    at java.io.OutputStreamWriter.flushBytes(OutputStreamWriter.java:167)
02-19 17:59:39.160: W/System.err(21977):    at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:158)
02-19 17:59:39.160: W/System.err(21977):    at java.io.BufferedWriter.flush(BufferedWriter.java:124)
02-19 17:59:39.160: W/System.err(21977):    at org.jivesoftware.smack.util.ObservableWriter.flush(ObservableWriter.java:48)
02-19 17:59:39.160: W/System.err(21977):    at org.jivesoftware.smack.PacketWriter.writePackets(PacketWriter.java:196)
02-19 17:59:39.160: W/System.err(21977):    at org.jivesoftware.smack.PacketWriter.access$000(PacketWriter.java:40)
02-19 17:59:39.160: W/System.err(21977):    at org.jivesoftware.smack.PacketWriter$1.run(PacketWriter.java:76)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.XMPPConnection.initReaderAndWriter(XMPPConnection.java:699)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.XMPPConnection.proceedTLSReceived(XMPPConnection.java:835)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:262)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:69)
02-19 17:59:39.164: W/System.err(21977):    Nested Exception: 
02-19 17:59:39.164: W/System.err(21977):    javax.net.ssl.SSLException: Unable to create application data
02-19 17:59:39.164: W/System.err(21977):    at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
02-19 17:59:39.164: W/System.err(21977):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:395)
02-19 17:59:39.164: W/System.err(21977):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl$SSLInputStream.<init>(OpenSSLSocketImpl.java:647)
02-19 17:59:39.164: W/System.err(21977):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.getInputStream(OpenSSLSocketImpl.java:618)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.XMPPConnection.initReaderAndWriter(XMPPConnection.java:666)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.XMPPConnection.proceedTLSReceived(XMPPConnection.java:835)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:262)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)
02-19 17:59:39.164: W/System.err(21977):    at org.jivesoftware.smack.PacketReader$1.run(PacketReader.java:69)

请帮助我重新连接失败的xmpp连接，并让我知道是否有任何方法可以检索会话id，以便我可以与服务器检查是否有任何xmpp连接相对于请求的会话id处于活动状态

共 (2) 个答案

# 1 楼答案

添加此代码：

静止的 {

    try 
    {
        Class.forName("org.jivesoftware.smack.ReconnectionManager");
    }
    catch (ClassNotFoundException e3) 
    {
        Log.e("TextNS", "class not found exception maintain connnection 75 :   +e3.toString());
    }
    catch (Exception e2) 
    {
        e2.printStackTrace();
    }
}

将连接列表添加到xmppconnetion

检测连接状态

# 2 楼答案
我已经解决了这个问题，我也找到了解决办法。解决办法如下：

1）首先，我将我在问题中给出的信任库逻辑更改为
```
    connectionConfig.setTruststoreType("BKS");
    connectionConfig.setTruststorePath("/system/etc/security/cacerts.bks");
```
2）然后我为XMPP连接添加了一个连接侦听器

3）我为ReconnectionManager添加了一个静态块，以便初始化连接参数

当我在真实设备上运行应用程序，然后将互联网连接从WIFI切换到3G，反之亦然时，连接侦听器发挥了重要作用。它尝试重新连接，丢失的xmpp连接再次建立

重要的一点是，确保在connectionlistener的过度使用的方法（即connectionClosed（））中提到用于建立xmpp连接的connect方法

感谢Carnal对您的帮助和合作

再见

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java无法在internet连接上重新连接XMPP已更改

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