java 对象输入输出流读写文件的操作实例

java 对象输入输出流读写文件的操作实例

java 支持对对象的读写操作，所操作的对象必须实现Serializable接口。

实例代码：

package vo;

import java.io.Serializable;

public class Animal implements Serializable {
  private static final long serialVersionUID = 1L;
  private String name;
  private Integer weight;
  private String color;
  private String type;
  private Integer age;
  private Integer lifetime;
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public Integer getWeight() {
    return weight;
  }
  public void setWeight(Integer weight) {
    this.weight = weight;
  }
  public String getColor() {
    return color;
  }
  public void setColor(String color) {
    this.color = color;
  }
  public String getType() {
    return type;
  }
  public void setType(String type) {
    this.type = type;
  }
  public Integer getAge() {
    return age;
  }
  public void setAge(Integer age) {
    this.age = age;
  }
  public Integer getLifetime() {
    return lifetime;
  }
  public void setLifetime(Integer lifetime) {
    this.lifetime = lifetime;
  }
  public Animal(String name, Integer weight, String color, String type, Integer age, Integer lifetime) {
    super();
    this.name = name;
    this.weight = weight;
    this.color = color;
    this.type = type;
    this.age = age;
    this.lifetime = lifetime;
  }
  @Override
  public String toString() {
    return "Animal [name=" + name + ", weight=" + weight + ", color=" + color + ", type=" + type + ", age=" + age + ", lifetime=" + lifetime + "]";
  }

}

package objectstream;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import vo.Animal;

public class TestObjectStream {
  public static void main(String[] args) {
    try {
      ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("d:/oos.dat")));
      Animal a1 = new Animal("tiger", 120, "red", "cat", 12, 20);
      Animal a2 = new Animal("eagle", 10, "gold", "bird", 6, 10);
      oos.writeObject(a1);
      oos.writeObject(a2);
      oos.flush();
      oos.close();

      ObjectInputStream ois = new ObjectInputStream(new FileInputStream("d:/oos.dat"));
      Animal ra1 = (Animal) ois.readObject();
      System.out.println(ra1.toString());
      Animal ra2 = (Animal) ois.readObject();
      System.out.println(ra2.toString());
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

输出结果：

Animal [name=tiger, weight=120, color=red, type=cat, age=12, lifetime=20]
Animal [name=eagle, weight=10, color=gold, type=bird, age=6, lifetime=10]

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