Java操作IO对象流进行数据的读写

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:

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：

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;}@Overridepublic String toString() {return 'Student [name=' + name + ', age=' + age + ', score=' + score + ']';} }

将数据写入对象流并存入文件

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

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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