连接被拒绝java中的套接字编程错误
我正在尝试执行的代码片段是使用jFileChooser选择一个文件并检索，将该数据写入Socket。
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { File selectedFile; FileReader reader = null; BufferedReader in; try { final JFileChooser fc = new JFileChooser(); fc.setFileSelectionMode(JFileChooser.FILES_ONLY); txtSearch.setText((fc.showOpenDialog(CreateNode.this) == JFileChooser.APPROVE_OPTION) ? fc.getSelectedFile().toString() : txtSearch.getText()); if (fc.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) { //gets file from dialog selectedFile = fc.getSelectedFile(); //makes sure files can be processed before proceeding if (selectedFile.canRead() && selectedFile.exists()) { System.out.println("can read:"+selectedFile.canRead()+"exists:"+selectedFile.exists()); reader = new FileReader(selectedFile); } } in = new BufferedReader(reader); //inputLine recieves file text String inputLine = in.readLine(); int LineNumber = 0; while (inputLine != null) { //LineNumber isn't needed, but it adds a line count on the left, nice LineNumber++; StringTokenizer tokenizer = new StringTokenizer(inputLine); Socket socket=new Socket("localhost",7788); //displays text file fileData.append(LineNumber + ": " + inputLine + "\n"); System.out.println("connected:"+socket.isConnected()); // ss.accept(); DataOutputStream dos4=new DataOutputStream(socket.getOutputStream()); //next line in File opened dos4.writeUTF(LineNumber + ": " + inputLine + "\n"); dos4.close(); socket.close(); ServerSocket ss=new ServerSocket(7788); Socket socket1=ss.accept(); DataInputStream inp=new DataInputStream(socket1.getInputStream()); //String msg=inp.readUTF(); //System.out.println("msg:"+msg); String input = (String)inp.readUTF(); System.out.println("inputline: "+input); ss.close(); } //close stream, files stops loading in.close(); // TODO add your handling code here: } catch (Exception e) { System.out.println("Exception e:"+e); e.printStackTrace(); } } 我尝试过使用禁用防火墙并在netBeans中重建应用程序（IDE我正在使用）
错误消息是
can read:trueexists:true Exception e:java.net.ConnectException: Connection refused: connect java.net.ConnectException: Connection refused: connect at java.net.DualStackPlainSocketImpl.connect0(Native Method) at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:69) 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:157) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391) at java.net.Socket.connect(Socket.java:579) at java.net.Socket.connect(Socket.java:528) at java.net.Socket.(Socket.java:425) at java.net.Socket.(Socket.java:208) at com.design.CreateNode.jButton1ActionPerformed(CreateNode.java:194) at com.design.CreateNode.access$000(CreateNode.java:29) at com.design.CreateNode$1.actionPerformed(CreateNode.java:95) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3320) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2719) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723) at java.awt.EventQueue.access$200(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:682) at java.awt.EventQueue$3.run(EventQueue.java:680) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) at java.awt.EventQueue$4.run(EventQueue.java:696) at java.awt.EventQueue$4.run(EventQueue.java:694) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:693) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
我在google和stcakoverflow中也看到了一些建议，但没有一个有用
正如评论中E_net4所暗示的那样，您在打开服务器之前创建了一个客户端。
我的猜测是你遵循这种方法，因为ServerSocket.accept方法的阻塞function。 更好的方法是
- 创建服务器套接字
- 在单独的线程中聆听连接，您可以在不中断主流的情况下安全地阻止连接
- 在服务器开始侦听连接后打开客户端套接字（
Socket类）
这都是正确的订购问题
当您尝试连接时，服务器套接字必须正在侦听连接。
尝试按此顺序执行套接字：
ServerSocket ss=new ServerSocket(7788); // Create listening socket. Socket socket=new Socket("localhost",7788); // Connect to listening socket. Socket socket1=ss.accept(); // Accept incoming connection.
首先创建服务器套接字然后创建套接字，它将创建客户端套接字的实例，然后创建另一个套接字对象以接受连接。
ServerSocket ss=new ServerSocket(7777); Socket socket=new Socket("localhost",7777); Socket socket1=ss.accept();