对象的读写
使用ObjectInputStream和ObjectOutputStream读写对象(序列化与反序列化)。
只有字节流没有字符流
.类必须实现Serializable接口 给类加个序列化编号，给类定义一个标记，新的修改后的类还可以操作曾经序列化的对象 静态是不能被序列化的，序列化只能对堆中的进行序列化 ，不能对[方法区]中的进行序列化 不需要序列化的字段前加 transient小例子：
先创建一个Dog对象并序列化:
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package com.uwo9.test03;
import java.io.Serializable;
public class Dog implements Serializable { private static final long serialVersionUID = 2809685095868158625L; String name; String color; } |
再创建一个Student对象并序列化：
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package com.uwo9.test03;
import java.io.Serializable;
public class Student implements Serializable { private static final long serialVersionUID = 9078616504949971001L; static public String schoolName; private transient String name; private transient int age; private double score; private Dog dog; public Student() { super (); } public Student(String name, int age, double score, Dog dog) { super (); this .name = name; this .age = age; this .score = score; this .dog = dog; } public String getName() { return name; } public void setName(String name) { this .name = name; } public int getAge() { return age; } public void setAge( int age) { this .age = age; } public double getScore() { return score; } public void setScore( double score) { this .score = score; } @Override public String toString() { return "Student [name=" + name + ", age=" + age + ", score=" + score + "]" ; }
} |
将数据写入对象流并存入文件
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package com.uwo9.test03;
import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.Collections;
public class Test01 {
public static void main(String[] args) { Dog dog = new Dog(); dog.name = "大黄" ; dog.color = "Yellow" ; Student student1 = new Student( "学生1" , 18 , 99 ,dog); Student student2 = new Student( "学生2" , 19 , 99 ,dog); Student student3 = new Student( "学生3" , 20 , 99 ,dog); Student.schoolName = "某某大学" ; File file = new File( "E:/Temp/Test1.txt" ); ObjectOutputStream oos = null ; try { oos = new ObjectOutputStream( new FileOutputStream(file)); //oos.writeObject(student); ArrayList<Student> arrayList = new ArrayList<>(); Collections.addAll(arrayList, student1,student2,student3); oos.writeObject(arrayList); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { oos.close(); } catch (IOException e) { e.printStackTrace(); } }
}
} |
从指定文件中读取对象
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package com.uwo9.test03;
import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.ObjectInputStream; import java.util.ArrayList;
public class Test02 {
public static void main(String[] args) { // 从指定的文件中读取对象 File file = new File( "E:/Temp/Test1.txt" ); ObjectInputStream ois= null ; try { ois = new ObjectInputStream( new FileInputStream(file)); // 读取对象 // Student stu = (Student)ois.readObject(); // System.out.println("读取到的数据为:"+stu); @SuppressWarnings ( "unchecked" ) ArrayList<Student> arrayList = (ArrayList<Student>) ois.readObject(); for (Student student : arrayList) { System.out.println(student); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } finally { try { ois.close(); } catch (IOException e) { e.printStackTrace(); } }
}
} |
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原文链接：https://blog.csdn.net/huanyinghanlang/article/details/78828347
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