java - Remote Database -

i tried creating app in java works remote database. apps works fine on local database. have included the port number well. scared may ip address using.

i thought myself there may hundreds if not thousands of pc's around world same ip mine... , how internet see 1 am, or stay secure it. sure don't give remote access ip of computer of home network, may wrong... don't know.

this function.

public void db() {     try {         class.forname("com.mysql.jdbc.driver");         connection mycon = drivermanager.getconnection("jdbc:mysql://ipofwebsite:3306/databasename", "username", "password");          system.out.println("connected");         mycon.close();     } catch (exception ex) {         ex.printstacktrace();     } } 

on remote db have added public ip address, still received error

"c:\program files\java\jdk1.8.0_25\bin\java" -didea.launcher.port=7532 "-didea.launcher.bin.path=c:\program files (x86)\jetbrains\intellij idea community edition 14.1.3\bin" -dfile.encoding=windows-1252 -classpath "c:\program files\java\jdk1.8.0_25\jre\lib\charsets.jar;c:\program files\java\jdk1.8.0_25\jre\lib\deploy.jar;c:\program files\java\jdk1.8.0_25\jre\lib\javaws.jar;c:\program files\java\jdk1.8.0_25\jre\lib\jce.jar;c:\program files\java\jdk1.8.0_25\jre\lib\jfr.jar;c:\program files\java\jdk1.8.0_25\jre\lib\jfxswt.jar;c:\program files\java\jdk1.8.0_25\jre\lib\jsse.jar;c:\program files\java\jdk1.8.0_25\jre\lib\management-agent.jar;c:\program files\java\jdk1.8.0_25\jre\lib\plugin.jar;c:\program files\java\jdk1.8.0_25\jre\lib\resources.jar;c:\program files\java\jdk1.8.0_25\jre\lib\rt.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\access-bridge-64.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\cldrdata.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\dnsns.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\jaccess.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\jfxrt.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\localedata.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\nashorn.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\sunec.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\sunjce_provider.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\sunmscapi.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\sunpkcs11.jar;c:\program files\java\jdk1.8.0_25\jre\lib\ext\zipfs.jar;h:\java dev\simple_java_db\out\production\simple_java_db;h:\java dev\simple_java_db\mysql-connector-java-5.1.35\mysql-connector-java-5.1.35\mysql-connector-java-5.1.35-bin.jar;c:\program files (x86)\jetbrains\intellij idea community edition 14.1.3\lib\idea_rt.jar" com.intellij.rt.execution.application.appmain main com.mysql.jdbc.exceptions.jdbc4.communicationsexception: communications link failure  last packet sent server 0 milliseconds ago. driver has not received packets server.     @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62)     @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)     @ java.lang.reflect.constructor.newinstance(constructor.java:408)     @ com.mysql.jdbc.util.handlenewinstance(util.java:389)     @ com.mysql.jdbc.sqlerror.createcommunicationsexception(sqlerror.java:1038)     @ com.mysql.jdbc.mysqlio.<init>(mysqlio.java:338)     @ com.mysql.jdbc.connectionimpl.coreconnect(connectionimpl.java:2237)     @ com.mysql.jdbc.connectionimpl.connectonetryonly(connectionimpl.java:2270)     @ com.mysql.jdbc.connectionimpl.createnewio(connectionimpl.java:2069)     @ com.mysql.jdbc.connectionimpl.<init>(connectionimpl.java:794)     @ com.mysql.jdbc.jdbc4connection.<init>(jdbc4connection.java:44)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance0(native method)     @ sun.reflect.nativeconstructoraccessorimpl.newinstance(nativeconstructoraccessorimpl.java:62)     @ sun.reflect.delegatingconstructoraccessorimpl.newinstance(delegatingconstructoraccessorimpl.java:45)     @ java.lang.reflect.constructor.newinstance(constructor.java:408)     @ com.mysql.jdbc.util.handlenewinstance(util.java:389)     @ com.mysql.jdbc.connectionimpl.getinstance(connectionimpl.java:399)     @ com.mysql.jdbc.nonregisteringdriver.connect(nonregisteringdriver.java:325)     @ java.sql.drivermanager.getconnection(drivermanager.java:664)     @ java.sql.drivermanager.getconnection(drivermanager.java:247)     @ main.db(main.java:24)     @ main.main(main.java:15)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:483)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:140) caused by: java.net.connectexception: connection refused: connect     @ java.net.dualstackplainsocketimpl.connect0(native method)     @ java.net.dualstackplainsocketimpl.socketconnect(dualstackplainsocketimpl.java:79)     @ java.net.abstractplainsocketimpl.doconnect(abstractplainsocketimpl.java:345)     @ java.net.abstractplainsocketimpl.connecttoaddress(abstractplainsocketimpl.java:206)     @ java.net.abstractplainsocketimpl.connect(abstractplainsocketimpl.java:188)     @ java.net.plainsocketimpl.connect(plainsocketimpl.java:172)     @ java.net.sockssocketimpl.connect(sockssocketimpl.java:392)     @ java.net.socket.connect(socket.java:589)     @ com.mysql.jdbc.standardsocketfactory.connect(standardsocketfactory.java:213)     @ com.mysql.jdbc.mysqlio.<init>(mysqlio.java:297)     ... 21 more 

any great. way did check firewall... should allow port receive , sent.

mysql default listen local interface (loopback). can reach local machine.

to change this, adapt mysql conf:

[mysqld]  bind-address=your-server-ip 

also, make sure skip-networking configuration commented out or not present.

more details here.