java对象数组的文件存取

万物接对象所以数组也是一个对象,可以直接写入;

package com.java.test;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.ArrayList;

import java.util.List;

/**

 * 测试向本地文件存储及读取对象数组

 * @author Administrator

 * 2015年11月4日16:00:22

 *

 */

public class TestListObject {

      /**

       * 建立一个学生对象的数组

       * @param stu

       * @return

       */

      public static List<Student> listStudents(Student stu){

            List<Student> lists = new ArrayList<Student>();

             for ( int i = 0; i <10; i++) {

                   lists.add( stu);

            }

             return  lists;

      }

      /**

       * 将student对象数组写入到文件中,数组也是一个对象,所以可以直接使用对象流存到文件中

       * @param stus

       */

      public static void writeIntoFile(List<Student> stus){

            ObjectOutputStream oos;

             try {

                   oos = new ObjectOutputStream( new BufferedOutputStream(new FileOutputStream("F://file.txt" )));

                  

                   oos.writeObject( stus);

                  

                   oos.flush();

                   oos.close();      

            } catch (IOException e) {

                   // TODO Auto-generated catch block

                   e.printStackTrace();

            } finally{

                  System. out.println( "文件写入完成!" );

            }

      }

      /**

       * 从文件中读取对象数组,并强制转换对象

       */

      @SuppressWarnings("unchecked")

      public static List<Student> testReader(){

            List<Student> lists = null;

             try {

                  ObjectInputStream ois = new ObjectInputStream( new BufferedInputStream(new FileInputStream("F://file.txt" )));

                   lists=(ArrayList<Student>) ois.readObject();

                   ois.close();

            } catch (IOException e) {

                   // TODO Auto-generated catch block

                   e.printStackTrace();

            } catch (ClassNotFoundException e) {

                   // TODO Auto-generated catch block

                   e.printStackTrace();

            } finally{

                  System. out.println( "读取成功!");

            }

             return lists;

      }

      public static void main(String[] args) {

            Student student = new Student();

             student.setId(99);

             student.setName( "maliao");

             student.setScore(899);

            

             //List<Student> stus = listStudents(student);

             //writeIntoFile(stus );

            System. out.println( testReader());

            

      }

}