錯誤Java套接字「線程-0」

我是新來的Java和我有一個任務，使一個簡單的套接字程序找到數字的平均值。但是當我嘗試運行我的程序時出現錯誤。錯誤Java套接字「線程-0」

我試圖解決這個問題，但仍沒有任何線索......

我有這個服務器名爲「server.java」與客戶稱爲「rerata.java」

但是當我嘗試就這rerata.java與現場客戶輸入數據「rerata 10 2 3」，它會顯示錯誤是這樣的：

Exception in thread "Thread-0" java.lang.ArrayIndexOutOfBoundsException: 4 at rerata.server.run(server.java:45)

那麼如何解決這個好嗎？

這是我server.java：

package rerata; 

import java.net.*; 
import java.io.*; 
/** 
* 
* @author GT-13 
*/ 
public class server extends Thread{ 

private static int port; 
private ServerSocket serverSocket; 

public server(int port) throws IOException 
{ 
    serverSocket = new ServerSocket(port); 
} 
@Override 
public void run() 
{ 
    while(true) 
    { 
     try 
     { 
      System.out.println(" Wait Client : !!!!"); 
      Socket serper = serverSocket.accept(); 

      DataOutputStream acc = new DataOutputStream(serper.getOutputStream()); 
      acc.writeUTF("OK "); 

      DataInputStream arr = new DataInputStream(serper.getInputStream()); 

      String kata = arr.readUTF(); 
      String[] angka = kata.split(" "); 
      float hasil = 0; 
      for(int i = 1; i <= angka.length;i++) 
      { 
       float nilai = 0; 
       nilai = Float.parseFloat(angka[i]); 
       hasil += nilai; 
       System.out.println(hasil); 
      } 
      System.out.println(hasil); 
      float kirim = (hasil/(angka.length-1)); 
      System.out.println(kirim); 
      DataOutputStream send = new DataOutputStream(serper.getOutputStream()); 
      send.writeFloat(kirim); 
     } 
      catch (SocketTimeoutException s) { 
      System.out.println("Socket timed out!"); 
      break; 
     } catch (IOException e) { 
      e.printStackTrace(); 
      break; 
     } 
    } 
} 
public static void main(String[] args) 
{ 
    port = 9000; 
    try 
    { 
     System.out.println("Server Start...."); 
     Thread t = new server(port); 
     t.start(); 
    } 
    catch(IOException e) 
    { 
     e.printStackTrace(); 

    } 
    } 
}

這是我rerata.java：

package rerata; 

import java.io.*; 
import java.net.Socket; 

public class Rerata extends javax.swing.JFrame { 

/** 
* Creates new form Rerata 
*/ 
public Rerata() { 
    initComponents(); 
} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    jLabel1 = new javax.swing.JLabel(); 
    nilai = new javax.swing.JTextField(); 
    excute = new javax.swing.JButton(); 
    jLabel2 = new javax.swing.JLabel(); 
    hasil = new javax.swing.JTextField(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jLabel1.setText("N i l a i :"); 

    excute.setText("Excute"); 
    excute.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      excuteActionPerformed(evt); 
     } 
    }); 

    jLabel2.setText("H a s i l :"); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(13, 13, 13) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
         .addComponent(excute) 
         .addGroup(layout.createSequentialGroup() 
          .addComponent(jLabel1) 
          .addGap(18, 18, 18) 
          .addComponent(nilai, javax.swing.GroupLayout.PREFERRED_SIZE, 253, javax.swing.GroupLayout.PREFERRED_SIZE)))) 
       .addGroup(layout.createSequentialGroup() 
        .addContainerGap() 
        .addComponent(jLabel2) 
        .addGap(18, 18, 18) 
        .addComponent(hasil, javax.swing.GroupLayout.PREFERRED_SIZE, 110, javax.swing.GroupLayout.PREFERRED_SIZE))) 
      .addContainerGap(78, Short.MAX_VALUE)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(20, 20, 20) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jLabel1) 
       .addComponent(nilai, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addGap(28, 28, 28) 
      .addComponent(excute) 
      .addGap(18, 18, 18) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jLabel2) 
       .addComponent(hasil, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addContainerGap(171, Short.MAX_VALUE)) 
    ); 

    pack(); 
}// </editor-fold>       

private void excuteActionPerformed(java.awt.event.ActionEvent evt) {          
    // TODO add your handling code here: 
    String sName = "localhost"; 
    int port = 9000; 
    String angka; 

    try { 
     System.out.println("Client Start>>>>>"+"\n##########"); 
     System.out.println("Connecting to Server....\n##########"); 
     Socket client = new Socket(sName, port); 

     OutputStream outToServer = client.getOutputStream(); 

     InputStream inFromServer1 = client.getInputStream(); 
     DataInputStream inOk = new DataInputStream(inFromServer1); 
     System.out.println("Server : " + inOk.readUTF()+"\n##########"); 

     //System.out.println("Angka Pertama : "); 
     angka = nilai.getText().trim(); 
     DataOutputStream outAngka1 = new DataOutputStream(outToServer); 
     outAngka1.writeUTF(angka); 

     InputStream inFromServer2 = client.getInputStream(); 
     DataInputStream inHasil = new DataInputStream(inFromServer2); 
     String a = String.valueOf(inHasil.readFloat()); 
     hasil.setText(a); 
     System.out.println(a); 


     client.close(); 

    } catch (IOException e) { 


    } 
}          

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
    * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
    */ 
    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(Rerata.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(Rerata.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(Rerata.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(Rerata.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 Rerata().setVisible(true); 
     } 
    }); 
} 



// Variables declaration - do not modify      
    private javax.swing.JButton excute; 
    private javax.swing.JTextField hasil; 
    private javax.swing.JLabel jLabel1; 
    private javax.swing.JLabel jLabel2; 
    private javax.swing.JTextField nilai; 
}

來源

2013-11-15 Gilank Njeil-brik