[英]Java FileStream - ObjectOutputStream ObjectInputStream
[英]ObjectInputStream / ObjectOutputStream | client that receive and send a lot of objects (Java)
我在多線程服務器/客戶端項目上有問題。
服務器端很好,但是問題出在客戶端上。
每當我需要在類上聲明一個ObjectInputStream
和ObjectOutputStream
作為屬性,然后在構造函數上實例化它們時,我就可以發送和接收對象
但是問題是代碼在ObjectInputStream
實例上阻塞了。
這是我的代碼:
客戶:
public class agency_auth_gui extends javax.swing.JFrame {
Socket s_service;
ObjectOutputStream out;
ObjectInputStream in;
public agency_auth_gui() {
try {
initComponents();
System.out.println("#Connexion en cours avec le Serveur Bancaire.");
s_service = new Socket("127.0.0.1", 6789);
out = new ObjectOutputStream(new BufferedOutputStream(s_service.getOutputStream()));
in= new ObjectInputStream(new BufferedInputStream(s_service.getInputStream()));
//Authentification du Client GAB
out.writeObject((String) "type:agence");
out.flush();
} catch (UnknownHostException ex) {
Logger.getLogger(agency_auth_gui.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(agency_auth_gui.class.getName()).log(Level.SEVERE, null, ex);
}
}
...
Some automaticaly generated swing code
...
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
// Envoi d'une arraylist exec contenant l'authentification
ArrayList exec = new ArrayList();
exec.add("auth_agent");
exec.add(jTextField1.getText());
exec.add(jTextField2.getText());
out.writeObject((ArrayList) exec);
out.flush();
// Reception de la reponse du serveur pour la fonction authentification
Agent agent = (Agent) in.readObject();
if(agent.getId()==0)
{
System.out.println("null");
}else
{
System.out.println(agent.getId());
}
} catch (IOException ex) {
Logger.getLogger(agency_auth_gui.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(agency_auth_gui.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(agency_auth_gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(agency_auth_gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(agency_auth_gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(agency_auth_gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new agency_auth_gui().setVisible(true);
}
});
}
// Variables declaration - do not modify
..
根據JavaDoc for ObjectInputStream :
該構造函數將阻塞,直到相應的ObjectOutputStream寫入並刷新了頭為止。
編輯
因此,看來您沒有從另一端收到InputStream
上的任何內容。
顯然,接受連接后,您的服務器就不會構造ObjectOutputStream。 不要推遲此步驟:它將在構造其ObjectInputStream時阻止客戶端。 請參閱Javadoc。
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