ObjectInputStream与ObjectOutputStream使用以及与DataInputStream,DataOutput区别
结论
1.Object相当于装IO流的一个盒子,我们可以把对象比作一个个拼好的积木,IO流就是拼积木的积木块,那么如果要搬走积木(对象),肯定需要把积木(对象)先拆了,再扔进盒子(Object)里,这就是为什么对象要序列化(Serializable)
2.当然装的时候我们可以有两种装法一种是全放入(output.writeObject(this))第一种盒子(ObjectInputStream)另一种是分类别 (如:,比如屋顶,地板,这就是流里面的) 放入(output.writeUTF(number),output.writeUTF(name),output.writeInt(age)…)第二种盒子(DataInputStream),所以在搬到另一个地方的时候,第一种盒子里我们把混在一起的积木块倒出((Member)intput.readObject()),第二种盒子则是分块拿出来({input.readUTF(),input.readUTF(),input.readInt()…)
#### 演示代码
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class Test {
public static void main(String[] args) throws IOException, ClassNotFoundException {
Member[] mebers= {new Member("iotest/4.txt","xiaohua",1),new Member("iotest/4.txt","xiaoming",3),new Member("iotest/4.txt","xiaofang",3)};
for(Member b:mebers) {
b.save();
}
System.out.println(Member.load("iotest/4.txt"));
}
}
class Member implements Serializable {
private String dest;
private String name;
private int age;
/**
*
* @param dest 写出的文目的地
* @param name用户名
* @param age用户年龄
*/
public Member(String dest,String name, int age) {
super();
this.dest=dest;
this.name = name;
this.age = age;
}
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;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return String.format("%s %d", name,age);
}
public void save() throws FileNotFoundException, IOException {
try (ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(dest))) {
output.writeObject(this);
}
}
/**
*
* @param number src 读入的源文件夹
* @return
* @throws FileNotFoundException 文件未发现异常
* @throws IOException io异常
* @throws ClassNotFoundException 文件目录异常
*/
public static Member load(String number) throws FileNotFoundException, IOException, ClassNotFoundException {
Member m;//接收读入的对象
try (ObjectInputStream output = new ObjectInputStream(new FileInputStream(number))) {
m=(Member)output.readObject();
}
return m;
}
}