我已经在不同的方法上工作了2个完整的编码日,我需要一些帮助:
我想用java在线创建一个多人游戏。 为此,我需要服务器和applet之间的通信
我的印象是,只要UDP服务器在托管applet的同一台机器上运行,它就可以工作。 (也许我需要纠正)
我在错误控制台(来自applet)上不断收到此错误java.security.AccessControlException:访问被拒绝(java.net.SocketPermission 127.0.0.1:5556 connect,resolve)
当尝试在applet上接收消息时,没有任何反应,没有任何内容被发送,也没有收到任何内容(udp服务器正在发送消息,applet没有收到,我知道udp发送正确,因为我单独测试它与客户端)
这是UDPclient.java applet:
``
import java.io.*;
import java.net.*;
import java.applet.*;
public class UDPClient extends Applet
{
protected DatagramSocket socket = null;
protected DatagramPacket packet = null;
String ipAddress;
public void init()
{
try{
System.out.println("got username");
String username = getParameter("username");
System.out.println("got ip");
ipAddress = getParameter("ip");
System.out.println("makingsocket");
socket = new DatagramSocket();
System.out.println("sending packet");
sendPacket();
System.out.println("receiving packet");
receivePacket();
System.out.println("closing socket");
socket.close();
}catch(Exception e){e.printStackTrace();}
}
public void sendPacket() throws IOException
{
byte[] buf ="hihihi".getBytes(); // send hihihi
InetAddress address = InetAddress.getByName(ipAddress);
packet = new DatagramPacket(buf, buf.length, address, 5556);
System.out.println("sending packet");
socket.send(packet);
int port = packet.getPort();
}
public void receivePacket() throws IOException
{
byte[] buf = new byte[256];
packet = new DatagramPacket(buf, buf.length);
System.out.println("getting packet--- calling socket.receive");
socket.receive(packet);
System.out.println("got here, receiving packet");
String modifiedSentence =new String(packet.getData());
System.out.println("FROM SERVER:" + modifiedSentence);
}
}
这是运行applet的HTML文件:
<applet code="UDPClient.class" width="640" height="480">
<param name="username" value="Guest">
<param name="ip" value="localhost">
</applet>
这是我正在使用的服务器
import java.io.*;
import java.net.*;
public class multiTest
{
static protected DatagramSocket socket = null;
static protected DatagramPacket packet = null;
public static void main(String [] args) throws IOException
{
socket = new DatagramSocket(5556);
while(true)
{
receivePacket();
sendPacket();
}
}
public static void receivePacket() throws IOException
{
//receive message from client
byte[] buf = new byte[256];
packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
//translate message in a thread
String message = new String(packet.getData(), 0, packet.getLength());
System.out.println("received" + message);
// should really make thread;
}
public static void sendPacket() throws IOException
{
byte[] buf = "ack".getBytes();
//send the message to the client to the given address and port
InetAddress address = packet.getAddress();
int port = packet.getPort();
packet = new DatagramPacket(buf, buf.length, address, port);
socket.send(packet);
}
}
我一直在尝试按照这里的教程:http://corvstudios.com/tutorials/udpMultiplayer.php来创建此代码。
我真的不想最终使用MINA,Tomcat或安装任何网络框架 - 但如果我必须告诉我,它会节省我很多时间
任何帮助都是先进的!
您的applet使用的JRE需要配置为授权您的applet访问文件系统。 请参阅applet的策略或安全性