我使用Java连接MySQL和Json将数据发送到android，当我通过URL地址将数据从Java发送到Json时：

http://192.168.1.221:9999/rentalcar_service/category/getAllManufacturer

一切都很好，但是当我在Android中解析数据时，我收到了一个错误结果，如下所示：

private static final String URL_MANUFACTURERS = "http://192.168.1.221:9999/rentalcar_service/category/getAllManufacturer";

logcat：

W/System.err: Caused by: android.system.ErrnoException: isConnected failed:    ECONNREFUSED (Connection refused)
W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:223)
W/System.err:   ... 25 more
I/MemoryCache: cache size=0 length=4
W/System.err: java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 9999) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused)
W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:234)
W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:171)
W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:122)

(192.168.1.221)IP地址是我的PC机，如果我从192.168.1.221更改为本地主机，我仍然会收到相同的错误。