我已经搜索了很多，但我找不到它的正确答案。我使用try_catch块来处理此异常（如果抛出此异常，将向用户显示一帧我将告诉他/她但它仍然在控制台中显示异常。请帮助我。谢谢。
submit（）方法将抛出此异常：
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，这是一个登录按钮的操作：
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)
答案 0 :(得分：6)
您在上一个问题中发布了代码：Sign in button has no visible effect in a Java application
根据runAClient方法判断，您正在记录异常并将其吃掉（而不是进一步抛弃）。
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);
}
}
第二个catch（IOException）不应该记录并且应该抛出异常。实际上，您可能希望将该catch捕获到您将抛出的ConnectException catch和可以单独处理的IOException catch中。
编辑：我会稍微扩展一下。 ConnectException扩展了RemoteException，后者又扩展了IOException，您正在捕捉并登录runAClient方法。你可以做两件事：
IOException，并将其捕获到较高级别（我认为这个解决方案非常难看）或
IOException块拆分为两个catch块，一个用于ConnectException，其中一个用于抛出，另一个用于IOException的其余块，您可以记录（或处理方式不同） - 只需确保在ConnectException块IOException块
答案 1 :(得分：2)
你有
的代码吗？ Main.runAClient();
也许有人正在捕获该异常并记录它，然后重新抛出？