Java 我们如何处理ConnectException?
我搜索了很多,但找不到很好的答案。我使用try\u catch块处理此异常(如果引发此异常,将向用户显示一帧,我将告诉他/她一条消息),但它仍在控制台中显示异常。请帮助我。谢谢 将引发此异常的submit()方法:Java 我们如何处理ConnectException?,java,networking,Java,Networking,我搜索了很多,但找不到很好的答案。我使用try\u catch块处理此异常(如果引发此异常,将向用户显示一帧,我将告诉他/她一条消息),但它仍在控制台中显示异常。请帮助我。谢谢 将引发此异常的submit()方法: private void submit() throws ConnectException { String id = idField.getText(); char[] pass1 = passField.getPassword(); String p
private void submit() throws ConnectException {
String id = idField.getText();
char[] pass1 = passField.getPassword();
String pass = new String(pass1);
if (id.equals("") || pass.equals("")) {
JOptionPane.showMessageDialog(this, "You should enter an ID and password", "Sign_In Problem", JOptionPane.OK_OPTION);
return;
} else {
boolean b = Manager.Test(id, pass);
if (b == true) {
this.setVisible(false);
Main.runAClient();
ListFrame frame = new ListFrame(client);
frame.setVisible(true);
} else {
JOptionPane.showMessageDialog(this, "You have entered wrong datas,try it again", "Sign_In Problem", JOptionPane.OK_OPTION);
return;
}
}
}
我使用netbeans,这是登录按钮的操作:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try {
submit();
} catch (ConnectException ex) {
JOptionPane.showMessageDialog(this, "You coudn't connect to the server successfully,try it again", "Sign_In Problem", JOptionPane.OK_OPTION);
}}
我的runAClient方法:
public static void runAClient()throws ConnectException{
try {
c = new Socket("localhost", 5000);
} catch (ConnectException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
堆栈跟踪:
init:
deps-jar:
compile-single:
run-single:
Jan 11, 2010 5:20:35 PM ClientNetWork.Main runAClient
SEVERE: null
java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:518)
at java.net.Socket.connect(Socket.java:468)
at java.net.Socket.<init>(Socket.java:365)
at java.net.Socket.<init>(Socket.java:179)
at ClientNetWork.Main.runAClient(Main.java:29)
at ClientGUI.MainFrame.submit(MainFrame.java:335)
at ClientGUI.MainFrame.jButton1ActionPerformed(MainFrame.java:233)
at ClientGUI.MainFrame.access$400(MainFrame.java:34)
at ClientGUI.MainFrame$5.actionPerformed(MainFrame.java:122)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(BasicRootPaneUI.java:191)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:267)
at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:216)
at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2926)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2918)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
at java.awt.Component.processEvent(Component.java:5815)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
at java.awt.Component.dispatchEventImpl(Component.java:4282)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
init:
deps jar:
编译单个:
单程运行:
2010年1月11日下午5:20:35客户端网络。主运行客户端
严重:空
java.net.ConnectException:连接被拒绝:连接
位于java.net.PlainSocketImpl.socketConnect(本机方法)
位于java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
位于java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
位于java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
位于java.net.socksocketimpl.connect(socksocketimpl.java:366)
位于java.net.Socket.connect(Socket.java:518)
位于java.net.Socket.connect(Socket.java:468)
位于java.net.Socket。(Socket.java:365)
位于java.net.Socket(Socket.java:179)
位于ClientNetWork.Main.runAClient(Main.java:29)
位于ClientGUI.MainFrame.submit(MainFrame.java:335)
在ClientGUI.MainFrame.jButton1ActionPerformed上(MainFrame.java:233)
在ClientGUI.MainFrame.access$400(MainFrame.java:34)
在ClientGUI.MainFrame$5.actionPerformed(MainFrame.java:122)
在javax.swing.AbstractButton.fireActionPerformed上(AbstractButton.java:1995)
位于javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
在javax.swing.DefaultButtonModel.fireActionPerformed上(DefaultButtonModel.java:387)
在javax.swing.DefaultButtonModel.setPressed中(DefaultButtonModel.java:242)
位于javax.swing.AbstractButton.doClick(AbstractButton.java:357)
位于javax.swing.plaf.basic.BasicRootPaneUI$Actions.actionPerformed(BasicRootPaneUI.java:191)
位于javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
位于javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
fireBinding(KeyboardManager.java:267)
在javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:216)
位于javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2926)
位于javax.swing.JComponent.processKeyBindings(JComponent.java:2918)
位于javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
位于java.awt.Component.processEvent(Component.java:5815)
位于java.awt.Container.processEvent(Container.java:2058)
位于java.awt.Component.dispatchEventImpl(Component.java:4410)
位于java.awt.Container.dispatchEventImpl(Container.java:2116)
位于java.awt.Component.dispatchEvent(Component.java:4240)
在java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)中
位于java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
位于java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
位于java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
位于java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
位于java.awt.Component.dispatchEventImpl(Component.java:4282)
位于java.awt.Container.dispatchEventImpl(Container.java:2116)
位于java.awt.Window.dispatchEventImpl(Window.java:2429)
位于java.awt.Component.dispatchEvent(Component.java:4240)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
位于java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:183)
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:173)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
你有密码吗
Main.runAClient();
也许有人正在捕获该异常并将其记录下来,然后重新引用?您在上一个问题中发布了代码: 通过
runAClient
方法判断,您正在记录异常并将其吃掉(而不是进一步抛出)
第二个捕获(IOException
)不应该记录,应该引发异常。实际上,您可能希望将该捕获拆分为一个ConnectException捕获(您将抛出)和一个IOException捕获(您可以单独处理)
编辑:我将对此进行一点扩展。扩展,然后扩展IOException
,您正在捕获并登录runAClient
方法。你可以做两件事:
- 完全删除
,并在更高级别捕获它(我认为这是一个非常丑陋的解决方案)IOException
- 将
块拆分为两个catch块,一个用于只抛出的IOException
,另一个用于ConnectException
块的其余部分,可以记录(或以不同方式处理)-只需确保IOException
块写在ConnectException
块之前IOException
public static void runAClient() {
try {
c = new Socket("localhost", 5000);
} catch (UnknownHostException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}