java 中套接字编程中的连接被拒绝错误
Connection Refused Error in socket programming in java
我要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();
}
}
我试过禁用防火墙并在 netBeans 中重建应用程序（IDE 我正在使用）
错误信息是
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.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:208)
at com.design.CreateNode.jButton1ActionPerformed(CreateNode.java:194)
at com.design.CreateNode.access[=12=]0(CreateNode.java:29)
at com.design.CreateNode.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.access0(EventQueue.java:103)
at java.awt.EventQueue.run(EventQueue.java:682)
at java.awt.EventQueue.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue.run(EventQueue.java:696)
at java.awt.EventQueue.run(EventQueue.java:694)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.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 中也看到了建议，但 none 发现有用
当您尝试连接时，服务器套接字必须正在侦听连接。
尝试按以下顺序处理套接字：
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.
正如评论中 E_net4 所暗示的，您在打开服务器之前创建了一个客户端。
我的猜测是，由于 ServerSocket.accept 方法的阻塞功能，您采用了这种方法。
更好的方法是
- 创建服务器套接字
- 在单独的线程中监听连接，您可以在不中断主流的情况下安全地阻塞
- 在服务器开始侦听连接后打开客户端套接字 (
Socket class)
这都是正确排序的问题
首先创建服务器套接字，然后创建客户端套接字实例的套接字，然后是另一个用于接受连接的套接字对象。
ServerSocket ss=new ServerSocket(7777);
Socket socket=new Socket("localhost",7777);
Socket socket1=ss.accept();
我要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();
}
}
我试过禁用防火墙并在 netBeans 中重建应用程序（IDE 我正在使用）
错误信息是
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.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:208)
at com.design.CreateNode.jButton1ActionPerformed(CreateNode.java:194)
at com.design.CreateNode.access[=12=]0(CreateNode.java:29)
at com.design.CreateNode.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.access0(EventQueue.java:103)
at java.awt.EventQueue.run(EventQueue.java:682)
at java.awt.EventQueue.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue.run(EventQueue.java:696)
at java.awt.EventQueue.run(EventQueue.java:694)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain.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 中也看到了建议，但 none 发现有用
当您尝试连接时，服务器套接字必须正在侦听连接。
尝试按以下顺序处理套接字：
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.
正如评论中 E_net4 所暗示的，您在打开服务器之前创建了一个客户端。
我的猜测是，由于 ServerSocket.accept 方法的阻塞功能，您采用了这种方法。
更好的方法是
- 创建服务器套接字
- 在单独的线程中监听连接，您可以在不中断主流的情况下安全地阻塞
- 在服务器开始侦听连接后打开客户端套接字 (
Socketclass)
这都是正确排序的问题
首先创建服务器套接字，然后创建客户端套接字实例的套接字，然后是另一个用于接受连接的套接字对象。
ServerSocket ss=new ServerSocket(7777);
Socket socket=new Socket("localhost",7777);
Socket socket1=ss.accept();