我不太了解连接过程我试图连接wordpress数据库而不用mysql中的my remotedesktop IP创建新数据库。通常我可以连接localhost，我可以连接到使用remote ip创建的数据库。在我的服务器中，mydatabase host name/Ip adress是localhost，正如我所说，我不知道url请求，wp-config文件和mysql之间的整个连接。我想我正在通过url向wp-config发送请求，并且它正在连接到我的localhost。无论如何，我想用JAVA连接到我的remotedesktop的localhost，但我不能。让我用代码解释一下。希望我能解释一下自己。
提前致谢。
以下是代码：
WP-config.php中
define('DB_NAME', 'mydbname');
define('DB_USER', 'mydbuser');
define('DB_PASSWORD', 'mydbpass');
define('DB_HOST', '127.0.0.1');
我的连接代码：
public class Dt_page {
public static DataSource getDataSource(int server) {
String database_driver = null;
String database_adres = null;
String dbuser = null;
String dbpass = null;
ConnectionFactory connectionFactory;
switch (server) {
case 1://profile server
database_driver = "com.mysql.jdbc.Driver";
database_adres = "jdbc:mysql://MY_REMOTE_DESKTOP_IP:3306/?useUnicode=true&characterEncoding=UTF-8&rewriteBatchedStatements=true";
dbuser = "mydbuser";
dbpass = "mydbpass";
}
try {
Class.forName(database_driver);
} catch (ClassNotFoundException ex) {
Logger.getLogger(Dt_page.class.getName()).log(Level.SEVERE, null, ex);
}
Properties props = new Properties();
props.put("user", dbuser);
props.put("password", dbpass);
props.put("autoReconnect", "true");
props.put("autoReconnectForPools", "true");
props.put("validationQuery", "SELECT 1 from dual;");
props.put("testWhileIdle","true");
connectionFactory = new DriverManagerConnectionFactory(database_adres, props);
GenericObjectPool connectionPool = new GenericObjectPool(null, 12, GenericObjectPool.WHEN_EXHAUSTED_GROW, 60*30, 12,true,true);
GenericKeyedObjectPoolFactory keyedObjectPoolFactory = new GenericKeyedObjectPoolFactory(null);
PoolableConnectionFactory poolableConnectionFactory =
new PoolableConnectionFactory(connectionFactory,
connectionPool,
keyedObjectPoolFactory,
"select 1",
30,
null,
false,
true);
PoolingDataSource dataSource = new PoolingDataSource(connectionPool);
return dataSource;
和SQL
QueryRunner qr;
qr = new QueryRunner(Dt_page.getDataSource(1));
try {
List<Object[]> v = qr.query("Select meta_value from mydbname.wp_favorite", new ArrayListHandler());
System.out.println(v.size());
for (Object[] objects : v) {
for (Object object : objects) {
System.out.println(object);
}
}
}
catch (Exception ex){
ex.printStackTrace();
}
}
}
错误日志：
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2367)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2288)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:187)
at org.apache.commons.dbcp.DriverManagerConnectionFactory.createConnection(DriverManagerConnectionFactory.java:78)
at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:582)
at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1188)
at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
at org.apache.commons.dbutils.AbstractQueryRunner.prepareConnection(AbstractQueryRunner.java:175)
at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:304)
at tazedizi.TazeDizi.main(TazeDizi.java:29)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2306)
... 19 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 21 more
答案 0 :(得分：0)
要检查两件事：