Java android版mysql jdbc中的连接被拒绝错误

我想通过jdbc连接访问android studio中的mysql数据库。我已经为jdbc连接编写了代码

我在网上遇到错误：-

 Connection con = DriverManager.getConnection(url, "myLogin", "myPassword");

并获得以下输出：-

03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
    ** BEGIN NESTED EXCEPTION **
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
    java.net.ConnectException
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? MESSAGE: failed to connect to /127.0.0.1 (port 3306): connect failed: ECONNREFUSED (Connection refused)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
    STACKTRACE:
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
    java.net.ConnectException: failed to connect to /127.0.0.1 (port 3306): connect failed: ECONNREFUSED (Connection refused)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at libcore.io.IoBridge.connect(IoBridge.java:124)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.net.Socket.startupSocket(Socket.java:590)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.net.Socket.<init>(Socket.java:226)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.Connection.createNewIO(Connection.java:2771)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.sql.DriverManager.getConnection(DriverManager.java:179)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.sql.DriverManager.getConnection(DriverManager.java:213)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.example.lenovo.beacon.MainActivity$2.insert(MainActivity.java:110)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.example.lenovo.beacon.MainActivity$2$1.run(MainActivity.java:98)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.lang.Thread.run(Thread.java:818)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? Caused by: android.system.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at libcore.io.Posix.connect(Native Method)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:111)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at libcore.io.IoBridge.connect(IoBridge.java:122)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? ... 14 more
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? ** END NESTED EXCEPTION **
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? [ 03-18 13:53:49.663 10650:10944 W/System.err ]
    Last packet sent to the server was 0 ms ago.
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.Connection.createNewIO(Connection.java:2847)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.sql.DriverManager.getConnection(DriverManager.java:179)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.sql.DriverManager.getConnection(DriverManager.java:213)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.example.lenovo.beacon.MainActivity$2.insert(MainActivity.java:110)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at com.example.lenovo.beacon.MainActivity$2$1.run(MainActivity.java:98)
03-18 13:53:49.663  10650-10944/com.example.lenovo.beacon W/System.err? at java.lang.Thread.run(Thread.java:818)

03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？com.mysql.jdbc.CommunicationsException:由于基础异常导致的通信链路故障：
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
**开始嵌套异常**
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
java.net.ConnectException
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？消息：无法连接到/127.0.0.1（端口3306）：连接失败：ECONREFUSE（连接被拒绝）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
堆栈跟踪：
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
java.net.ConnectException:无法连接到/127.0.0.1（端口3306）：连接失败：EConRefused（连接被拒绝）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于libcore.io.IoBridge.connect（IoBridge.java:124）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.net.PlainSocketImpl.connect（PlainSocketImpl.java:183）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.net.PlainSocketImpl.connect（PlainSocketImpl.java:163）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.net.Socket.startupSocket（Socket.java:590）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.net.Socket（Socket.java:226）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.StandardSocketFactory.connect（StandardSocketFactory.java:256）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？在com.mysql.jdbc.MysqlIO上（MysqlIO.java:271）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？在com.mysql.jdbc.Connection.createNewIO上（Connection.java:2771）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.Connection（Connection.java:1555）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:285）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.sql.DriverManager.getConnection（DriverManager.java:179）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.sql.DriverManager.getConnection（DriverManager.java:213）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.example.lenovo.beacon.MainActivity$2.insert（MainActivity.java:110）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.example.lenovo.beacon.MainActivity$2$1.run（MainActivity.java:98）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？运行（Thread.java:818）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？原因：android.system.ErrnoException:连接失败：EconRefused（连接被拒绝）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于libcore.io.Posix.connect（本机方法）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？在libcore.io.BlockGuardOs.connect上（BlockGuardOs.java:111）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？在libcore.io.IoBridge.ConnecterNo（IoBridge.java:137）中
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于libcore.io.IoBridge.connect（IoBridge.java:122）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err。。。14多
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？**结束嵌套异常**
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？[03-18 13:53:49.663 10650:10944 W/System.err]
上次发送到服务器的数据包是0毫秒前的。
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.Connection.createNewIO（Connection.java:2847）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.Connection（Connection.java:1555）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:285）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.sql.DriverManager.getConnection（DriverManager.java:179）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于java.sql.DriverManager.getConnection（DriverManager.java:213）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.example.lenovo.beacon.MainActivity$2.insert（MainActivity.java:110）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？位于com.example.lenovo.beacon.MainActivity$2$1.run（MainActivity.java:98）
03-18 13:53:49.663 10650-10944/com.example.lenovo.beacon W/System.err？运行（Thread.java:818）

---

请告诉我错误所在

您试图连接到127.0.0.1上的mysql数据库-您是否在android设备上运行mysql服务器？在android设备上，您必须使用此10.0.2.2:portnumber而不是127.0.0.1我没有在android设备上运行mysql服务器我参考了以下链接：-