java.rmi.ConnectException : Connection refused to host: 127. 0.0.1

Question

我试过使用 RMI，这里是服务器端。起初它没有任何异常地工作，但现在每当我尝试运行下面的代码三次后，我会得到一些错误

代码是:

import java.rmi.server.UnicastRemoteObject;

/**
 * Created by elyas on 12/11/14 AD.
 */
public class LogicImplement extends UnicastRemoteObject implements Logic
{

    public LogicImplement() throws Exception
    {
        java.rmi.registry.LocateRegistry.createRegistry(6060);
        java.rmi.Naming.rebind("Object1",this);
    }

    @Override
    public int sum(int a, int b) throws Exception
    {
        int result = a + b;
        System.out.println("ana sum executed");
        return result;
    }

    public static void main(String[] args)
    {
        try
        {
            LogicImplement logicImplement  = new LogicImplement();
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    } 
} 

错误是这样的:我试图将 Object1 更改为 Object2，但我又会出错，我还更改了端口号...

什么是解决方案？

java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is: 
    java.net.ConnectException: Connection refused
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:341)
    at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
    at java.rmi.Naming.rebind(Naming.java:177)
    at LogicImplement.<init>(LogicImplement.java:12)
    at LogicImplement.main(LogicImplement.java:27)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    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.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:208)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:147)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
    ... 12 more

Answer 1

java.net.ConnectException: Connection refused

此异常可能有几个原因:

• 您还没有在后台启动您的 rmiregistry。
• 您正在尝试连接到错误的端口号。
• 您的防火墙可能会阻止连接。