java 序列化對象 serializable 讀寫資料的執行個體

序列化對象：

複製代碼 代碼如下:package com.chen.seriaizable;

import java.io.Serializable;
import java.util.List;

@SuppressWarnings("serial")
public class Student implements Serializable
{
private String name;

private String id;

private int age;

private List<Student> students;

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public String getId()
{
return id;
}

public void setId(String id)
{
this.id = id;
}

public int getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}

public List<Student> getStudents()
{
return students;
}

public void setStudents(List<Student> students)
{
this.students = students;
}

@Override
public String toString()
{
StringBuffer stringBuffer = new StringBuffer();
stringBuffer.append("id：" + this.id).append("\n");
stringBuffer.append("name：" + this.name).append("\n");
stringBuffer.append("age：" + this.age).append("\n");

return stringBuffer.toString();
}
}

複製代碼 代碼如下:package com.chen.seriaizable;

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;

public class SaveStudent
{
private Student student;
// 序列化檔案儲存位置
private String path = "C:/student.Serializable";

public void writeStudent()
{
List<Student> students = new ArrayList<Student>();
student = new Student();

Student student1 = new Student();
student1.setAge(1);
student1.setId("1");
student1.setName("張1");
students.add(student1);

Student student2 = new Student();
student2.setAge(2);
student2.setId("2");
student2.setName("張2");
students.add(student2);

Student student3 = new Student();
student3.setAge(3);
student3.setId("3");
student3.setName("張3");
students.add(student3);

Student student4 = new Student();
student4.setAge(4);
student4.setId("4");
student4.setName("張4");

Student student41 = new Student();
student41.setAge(41);
student41.setId("41");
student41.setName("張41");
List<Student> students4 = new ArrayList<Student>();
students4.add(student41);

student4.setStudents(students4);

students.add(student4);

student.setAge(500);
student.setId("100");
student.setName("張A000");
student.setStudents(students);
try
{
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(path));

objectOutputStream.writeObject(student);

objectOutputStream.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("寫完");
}

public void readStudent()
{
try
{
ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(path));

student = (Student) objectInputStream.readObject();

System.out.println(student.getAge());

objectInputStream.close();
}
catch (Exception e)
{
e.printStackTrace();
}
System.out.println("讀完");
}

@Override
public String toString()
{
readStudent();
StringBuffer stringBuffer = new StringBuffer(100);

studentToString(stringBuffer, student);

return stringBuffer.toString();
}

public void studentToString(StringBuffer stringBuffer, Student studentObj)
{
if (student != null)
{
stringBuffer.append("id：" + studentObj.toString()).append("\n");
if (studentObj.getStudents() != null)
{
stringBuffer.append("\n[\n");
for (Student bean : studentObj.getStudents())
{
studentToString(stringBuffer, bean);
}
stringBuffer.append("\n]\n");
}
}
}

}

測試類別：

複製代碼 代碼如下:package com.chen.seriaizable;

public class Test
{
/**
* @param args
*/
public static void main(String[] args)
{
SaveStudent saveStudent = new SaveStudent();
// 1 先執行寫入檔案
// saveStudent.writeStudent();
// 2 再讀取
System.out.println(saveStudent);
System.out.println("讀完");
}

}