关于写文件的问题(星期一结帖)
用流的方法写文件和读文件,请给个完整的例子!
(最好测试过可以用)
可用的话全分赠送.

------解决方案--------------------
/**
@version 1.11 2004-05-11
@author Cay Horstmann
*/

import java.io.*;
import java.util.*;

public class RandomFileTest
{
public static void main(String[] args)
{
Employee[] staff = new Employee[3];

staff[0] = new Employee( "Carl Cracker ", 75000, 1987, 12, 15);
staff[1] = new Employee( "Harry Hacker ", 50000, 1989, 10, 1);
staff[2] = new Employee( "Tony Tester ", 40000, 1990, 3, 15);

try
{
// save all employee records to the file employee.dat
DataOutputStream out = new DataOutputStream(new FileOutputStream( "employee.dat "));
for (Employee e : staff)
e.writeData(out);
out.close();

// retrieve all records into a new array
RandomAccessFile in = new RandomAccessFile( "employee.dat ", "r ");
// compute the array size
int n = (int)(in.length() / Employee.RECORD_SIZE);
Employee[] newStaff = new Employee[n];

// read employees in reverse order
for (int i = n - 1; i > = 0; i--)
{
newStaff[i] = new Employee();
in.seek(i * Employee.RECORD_SIZE);
newStaff[i].readData(in);
}
in.close();

// print the newly read employee records
for (Employee e : newStaff)
System.out.println(e);
}
catch(IOException e)
{
e.printStackTrace();
}
}
}

class Employee
{
public Employee() {}

public Employee(String n, double s, int year, int month, int day)
{
name = n;
salary = s;
GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
hireDay = calendar.getTime();
}

public String getName()
{
return name;
}

public double getSalary()
{
return salary;
}

public Date getHireDay()
{
return hireDay;
}

/**
Writes employee data to a data output
@param out the data output
*/
public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
}

public String toString()
{
return getClass().getName()
+ "[name= " + name
+ ",salary= " + salary
+ ",hireDay= " + hireDay
+ "] ";
}

/**
Writes employee data to a data output
@param out the data output
*/
public void writeData(DataOutput out) throws IOException
{
DataIO.writeFixedString(name, NAME_SIZE, out);
out.writeDouble(salary);

GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(hireDay);
out.writeInt(calendar.get(Calendar.YEAR));
out.writeInt(calendar.get(Calendar.MONTH) + 1);
out.writeInt(calendar.get(Calendar.DAY_OF_MONTH));
}

/**
Reads employee data from a data input
@param in the data input
*/
public void readData(DataInput in) throws IOException
{
name = DataIO.readFixedString(NAME_SIZE, in);