Java源码——读取顺序存取文件中的数据（read text file and display each record）

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代码如下：

// Fig. 15.6: ReadTextFile.java// This program reads a text file and displays each record.package ch15;import java.io.IOException;import java.lang.IllegalStateException;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;import java.util.NoSuchElementException;import java.util.Scanner;public class ReadTextFile{   private static Scanner input;   public static void main(String[] args)   {      openFile();      readRecords();      closeFile();   }    // open file clients.txt   public static void openFile()   {      try      {         input = new Scanner(Paths.get("clients.txt"));       }       catch (IOException ioException)      {         System.err.println("Error opening file. Terminating.");         System.exit(1);      }    }   // read record from file   public static void readRecords()   {      System.out.printf("%-10s%-12s%-12s%10s%n", "Account",         "First Name", "Last Name", "Balance");      try       {         while (input.hasNext()) // while there is more to read         {            // display record contents                                 System.out.printf("%-10d%-12s%-12s%10.2f%n", input.nextInt(),                input.next(), input.next(), input.nextDouble());         }      }       catch (NoSuchElementException elementException)      {         System.err.println("File improperly formed. Terminating.");      }       catch (IllegalStateException stateException)      {         System.err.println("Error reading from file. Terminating.");      }    } // end method readRecords   // close file and terminate application   public static void closeFile()   {      if (input != null)         input.close();   } } // end class ReadTextFile

调试结果：

Account   First Name Last Name      Balance
1         a           b                 1.00
2         c           d                 3.00
3         e           f                 8.00

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