报错如下:com.mysql.jdbc.CommunicationsException: Communications link failureLast packet sent to the server was 0 ms ago.
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at TestJDBC.main(TestJDBC.java:17)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:507)
at java.net.Socket.connect(Socket.java:457)
at java.net.Socket.<init>(Socket.java:365)
at java.net.Socket.<init>(Socket.java:207)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:280)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2026)
... 6 moreimport java.sql.*;public class TestJDBC { public static void main(String[] args) { ResultSet rs = null;
Connection con = null;
Statement sta = null;
try {
Class.forName("com.mysql.jdbc.Driver");
// ? new com.mysql.jdbc.Driver();
String url = "jdbc:mysql://localhost:3306/bbs"; //bbs为数据库名
String user = "root";
String password = "zhao";
try {
con = DriverManager.getConnection(url, user, password);
sta = con.createStatement();
rs = sta.executeQuery("select * from article"); while (rs.next()) {
int id = rs.getInt("id");
System.out.println(id); } } catch (SQLException e) {
e.printStackTrace();
} } catch (ClassNotFoundException e1) { e1.printStackTrace();
} finally { try {
if (rs != null) {
rs.close();
rs = null;
}
if (con != null) {
con.close();
con = null;
}
if (sta != null) {
sta.close();
sta = null;
}
} catch (SQLException e) { e.printStackTrace();
}
} }}
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at TestJDBC.main(TestJDBC.java:17)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:507)
at java.net.Socket.connect(Socket.java:457)
at java.net.Socket.<init>(Socket.java:365)
at java.net.Socket.<init>(Socket.java:207)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:253)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:280)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2026)
... 6 moreimport java.sql.*;public class TestJDBC { public static void main(String[] args) { ResultSet rs = null;
Connection con = null;
Statement sta = null;
try {
Class.forName("com.mysql.jdbc.Driver");
// ? new com.mysql.jdbc.Driver();
String url = "jdbc:mysql://localhost:3306/bbs"; //bbs为数据库名
String user = "root";
String password = "zhao";
try {
con = DriverManager.getConnection(url, user, password);
sta = con.createStatement();
rs = sta.executeQuery("select * from article"); while (rs.next()) {
int id = rs.getInt("id");
System.out.println(id); } } catch (SQLException e) {
e.printStackTrace();
} } catch (ClassNotFoundException e1) { e1.printStackTrace();
} finally { try {
if (rs != null) {
rs.close();
rs = null;
}
if (con != null) {
con.close();
con = null;
}
if (sta != null) {
sta.close();
sta = null;
}
} catch (SQLException e) { e.printStackTrace();
}
} }}
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