如何使用 Stun 和 ice4j 接收 public IP 和端口
How to receive public IP and Port using Stun and ice4j
我会尽量简短。
我希望在不通过服务器的情况下在 2 个 java 应用程序（稍后将传输到 android）之间创建通信。因此，我花了数周时间环顾四周，经过大量工作后，我找到了 stun 和 ice4j。我找到了关于如何使用 ice4j 的最佳解释 here，它几乎向我展示了我需要做什么才能将 stun 服务器添加到代理（我真的不知道代理是什么，只是它管理我与 STUN 和 TURN 的通信），通过此代码：
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.ice4j.Transport;
import org.ice4j.TransportAddress;
import org.ice4j.ice.Agent;
import org.ice4j.ice.IceMediaStream;
import org.ice4j.ice.harvest.StunCandidateHarvester;
public class ice4jTesting {
public static void main(String[] args) {
Agent agent = new Agent();
String[] hostnames = new String[] {"jitsi.org", "numb.viagenie.ca", "stun.ekiga.net"};
for(String hostname: hostnames) {
try {
TransportAddress address;
address = new TransportAddress(InetAddress.getByName(hostname), 3478, Transport.UDP);
agent.addCandidateHarvester(new StunCandidateHarvester(address));
} catch (UnknownHostException ex) {
Logger.getLogger(SimpleStun.class.getName()).log(Level.SEVERE, null, ex);
}
}
IceMediaStream stream = agent.createMediaStream("audio");
int port = 5000;
try {
agent.createComponent(stream, Transport.UDP, port, port, port+100);
// The three last arguments are: preferredPort, minPort, maxPort
} catch (IllegalArgumentException | IOException ex) {
Logger.getLogger(SimpleStun.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
然而，在本教程之后使用 SDPUtils，我在 github, to recieve the SDP information from the agent. However I got ice4j.jar from the central maven repository 上找到的 ice4j 源代码中的一个 class，并将其添加到我的 netbeans 常规项目中（我这样做是因为我对 maven 不是很熟悉，只是想在我的常规项目中使用一个常规库）。这个 jar 库没有 SDPUtils class，而且由于我对这段代码的了解还不够多，无法自己修复它，我想知道你们中是否有人可以帮助我修复上面的代码，或举例说明如何回答标题中的问题。
但是，除非你能按照我在最后一句话中所说的去做，或者给我指出一些示例代码，否则你的帮助很可能没有用，因为我在精神上无法完全理解这背后的理论，因为我不知道的许多概念。
我必须在本周末之前解决这个问题，否则我就完蛋了。所以，如果您能或认识可以提供帮助的人，我将不胜感激。
感谢您到目前为止的阅读并试图提供帮助:)
Actually i'm also working on the same as my University project. From last week i'm digging web for p2p connection establish over nat.
I know that form where you got above Code snipet, i would like to inform you that there is errors in that code Here is the one that i corrected
import java.io.IOException;
import java.net.BindException;
import java.net.InetAddress;
import org.ice4j.Transport;
import org.ice4j.TransportAddress;
import org.ice4j.ice.Agent;
import org.ice4j.ice.IceMediaStream;
import org.ice4j.ice.harvest.StunCandidateHarvester;
public class IceTest {
public static void main(String[] args) throws Exception {
Agent agent = new Agent(); // A simple ICE Agent
/*** Setup the STUN servers: ***/
String[] hostnames = new String[] { "jitsi.org", "numb.viagenie.ca", "stun.ekiga.net" };
// Look online for actively working public STUN Servers. You can find
// free servers.
// Now add these URLS as Stun Servers with standard 3478 port for STUN
// servrs.
for (String hostname : hostnames) {
try {
// InetAddress qualifies a url to an IP Address, if you have an
// error here, make sure the url is reachable and correct
TransportAddress ta = new TransportAddress(InetAddress.getByName(hostname), 3478, Transport.UDP);
// Currently Ice4J only supports UDP and will throw an Error
// otherwise
agent.addCandidateHarvester(new StunCandidateHarvester(ta));
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* Now you have your Agent setup. The agent will now be able to know its
* IP Address and Port once you attempt to connect. You do need to setup
* Streams on the Agent to open a flow of information on a specific
* port.
*/
IceMediaStream stream = agent.createMediaStream("audio");
int port = 5000; // Choose any port
try {
agent.createComponent(stream, Transport.UDP, port, port, port + 100);
// The three last arguments are: preferredPort, minPort, maxPort
} catch (BindException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
* Now we have our port and we have our stream to allow for information
* to flow. The issue is that once we have all the information we need
* each computer to get the remote computer's information. Of course how
* do you get that information if you can't connect? There might be a
* few ways, but the easiest with just ICE4J is to POST the information
* to your public sever and retrieve the information. I even use a
* simple PHP server I wrote to store and spit out information.
*/
String toSend = null;
try {
toSend = SdpUtils.createSDPDescription(agent);
// Each computersends this information
// This information describes all the possible IP addresses and
// ports
} catch (Throwable e) {
e.printStackTrace();
}
/*The String "toSend" should be sent to a server. You need to write a PHP, Java or any server.
* It should be able to have this String posted to a database.
* Each program checks to see if another program is requesting a call.
* If it is, they can both post this "toSend" information and then read eachother's "toSend" SDP string.
* After you get this information about the remote computer do the following for ice4j to build the connection:*/
String remoteReceived = ""; // This information was grabbed from the server, and shouldn't be empty.
SdpUtils.parseSDP(agent, remoteReceived); // This will add the remote information to the agent.
//Hopefully now your Agent is totally setup. Now we need to start the connections:
agent.addStateChangeListener(new StateListener()); // We will define this class soon
// You need to listen for state change so that once connected you can then use the socket.
agent.startConnectivityEstablishment(); // This will do all the work for you to connect
}
}
This code Requires SIP server to be setup and the one on ice4j test is saying something else just have a look at Ice.java
我会尽量简短。
我希望在不通过服务器的情况下在 2 个 java 应用程序（稍后将传输到 android）之间创建通信。因此，我花了数周时间环顾四周，经过大量工作后，我找到了 stun 和 ice4j。我找到了关于如何使用 ice4j 的最佳解释 here，它几乎向我展示了我需要做什么才能将 stun 服务器添加到代理（我真的不知道代理是什么，只是它管理我与 STUN 和 TURN 的通信），通过此代码：
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.ice4j.Transport;
import org.ice4j.TransportAddress;
import org.ice4j.ice.Agent;
import org.ice4j.ice.IceMediaStream;
import org.ice4j.ice.harvest.StunCandidateHarvester;
public class ice4jTesting {
public static void main(String[] args) {
Agent agent = new Agent();
String[] hostnames = new String[] {"jitsi.org", "numb.viagenie.ca", "stun.ekiga.net"};
for(String hostname: hostnames) {
try {
TransportAddress address;
address = new TransportAddress(InetAddress.getByName(hostname), 3478, Transport.UDP);
agent.addCandidateHarvester(new StunCandidateHarvester(address));
} catch (UnknownHostException ex) {
Logger.getLogger(SimpleStun.class.getName()).log(Level.SEVERE, null, ex);
}
}
IceMediaStream stream = agent.createMediaStream("audio");
int port = 5000;
try {
agent.createComponent(stream, Transport.UDP, port, port, port+100);
// The three last arguments are: preferredPort, minPort, maxPort
} catch (IllegalArgumentException | IOException ex) {
Logger.getLogger(SimpleStun.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
然而，在本教程之后使用 SDPUtils，我在 github, to recieve the SDP information from the agent. However I got ice4j.jar from the central maven repository 上找到的 ice4j 源代码中的一个 class，并将其添加到我的 netbeans 常规项目中（我这样做是因为我对 maven 不是很熟悉，只是想在我的常规项目中使用一个常规库）。这个 jar 库没有 SDPUtils class，而且由于我对这段代码的了解还不够多，无法自己修复它，我想知道你们中是否有人可以帮助我修复上面的代码，或举例说明如何回答标题中的问题。
但是，除非你能按照我在最后一句话中所说的去做，或者给我指出一些示例代码，否则你的帮助很可能没有用，因为我在精神上无法完全理解这背后的理论，因为我不知道的许多概念。
我必须在本周末之前解决这个问题，否则我就完蛋了。所以，如果您能或认识可以提供帮助的人，我将不胜感激。
感谢您到目前为止的阅读并试图提供帮助:)
Actually i'm also working on the same as my University project. From last week i'm digging web for p2p connection establish over nat.
I know that form where you got above Code snipet, i would like to inform you that there is errors in that code Here is the one that i corrected
import java.io.IOException;
import java.net.BindException;
import java.net.InetAddress;
import org.ice4j.Transport;
import org.ice4j.TransportAddress;
import org.ice4j.ice.Agent;
import org.ice4j.ice.IceMediaStream;
import org.ice4j.ice.harvest.StunCandidateHarvester;
public class IceTest {
public static void main(String[] args) throws Exception {
Agent agent = new Agent(); // A simple ICE Agent
/*** Setup the STUN servers: ***/
String[] hostnames = new String[] { "jitsi.org", "numb.viagenie.ca", "stun.ekiga.net" };
// Look online for actively working public STUN Servers. You can find
// free servers.
// Now add these URLS as Stun Servers with standard 3478 port for STUN
// servrs.
for (String hostname : hostnames) {
try {
// InetAddress qualifies a url to an IP Address, if you have an
// error here, make sure the url is reachable and correct
TransportAddress ta = new TransportAddress(InetAddress.getByName(hostname), 3478, Transport.UDP);
// Currently Ice4J only supports UDP and will throw an Error
// otherwise
agent.addCandidateHarvester(new StunCandidateHarvester(ta));
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* Now you have your Agent setup. The agent will now be able to know its
* IP Address and Port once you attempt to connect. You do need to setup
* Streams on the Agent to open a flow of information on a specific
* port.
*/
IceMediaStream stream = agent.createMediaStream("audio");
int port = 5000; // Choose any port
try {
agent.createComponent(stream, Transport.UDP, port, port, port + 100);
// The three last arguments are: preferredPort, minPort, maxPort
} catch (BindException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*
* Now we have our port and we have our stream to allow for information
* to flow. The issue is that once we have all the information we need
* each computer to get the remote computer's information. Of course how
* do you get that information if you can't connect? There might be a
* few ways, but the easiest with just ICE4J is to POST the information
* to your public sever and retrieve the information. I even use a
* simple PHP server I wrote to store and spit out information.
*/
String toSend = null;
try {
toSend = SdpUtils.createSDPDescription(agent);
// Each computersends this information
// This information describes all the possible IP addresses and
// ports
} catch (Throwable e) {
e.printStackTrace();
}
/*The String "toSend" should be sent to a server. You need to write a PHP, Java or any server.
* It should be able to have this String posted to a database.
* Each program checks to see if another program is requesting a call.
* If it is, they can both post this "toSend" information and then read eachother's "toSend" SDP string.
* After you get this information about the remote computer do the following for ice4j to build the connection:*/
String remoteReceived = ""; // This information was grabbed from the server, and shouldn't be empty.
SdpUtils.parseSDP(agent, remoteReceived); // This will add the remote information to the agent.
//Hopefully now your Agent is totally setup. Now we need to start the connections:
agent.addStateChangeListener(new StateListener()); // We will define this class soon
// You need to listen for state change so that once connected you can then use the socket.
agent.startConnectivityEstablishment(); // This will do all the work for you to connect
}
}
This code Requires SIP server to be setup and the one on ice4j test is saying something else just have a look at Ice.java