package cn.edu.hyit.file;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
public class Demo_5 {
static ArrayList al=new ArrayList();
public static void main(String[] args) {
write();
read();
}
public static Student read(){
FileInputStream fis = null;
Student temp = null;
try {
fis = new FileInputStream("stu.txt");
ObjectInputStream ois = new ObjectInputStream(fis);
//Student stu = (Student)ois.readObject();
//while(fis.available()>0){
al = (ArrayList<Student>)ois.readObject();
//}
for(Student s:al){
System.out.println("学生的名字:"+s.getName()+"\t"+"学生的年龄是"+s.getAge());
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}finally{
if(fis!=null){
try{
fis.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
return temp;
}
public static Student write(){
FileOutputStream fos = null;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
try{
fos = new FileOutputStream("stu.txt",true);
ObjectOutputStream obs = new ObjectOutputStream(fos);
System.out.println("请输入名字");
String name=br.readLine();
System.out.println("请输入年龄");
String s=br.readLine();
int age=Integer.parseInt(s);
Student stu = new Student(name,age);
al.add(stu);
obs.writeObject(al);
obs.flush();
obs.close();
}catch(IOException e){
e.printStackTrace();
}
return null;
}
}
class Student implements Serializable{
//private static final long serialVersionUID = 1L;
private String name;
private int age;
public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
我只是要证明一下,除了楼上那个好人,我也会回答你的问题。
首先,如果你要保存多个值,肯定涉及要涉及到循环读取输入,并且传入List.
public static Student write(){
try{
while(true){
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
FileOutputStream fos = = new FileOutputStream("stu.txt",true);
ObjectOutputStream obs = new ObjectOutputStream(fos);
System.out.println("请输入名字");
String name=br.readLine();
System.out.println("请输入年龄");
String s=br.readLine();
int age=Integer.parseInt(s);
Student stu = new Student(name,age);
al.add(stu);
obs.writeObject(al);
obs.flush();
obs.close();
System.out.println("是否退出([1]退出)?");
String exit=br.readLine();
if(exit){
break;
}
}
}catch(IOException e){
e.printStackTrace();
}
return null;
}
大概就是这样,你运行一下试试,我没运行
别乱写啊 孩子,你序列化的时候写进去的是student对象,你反序列化怎么可能读出来arraylist,顺便序列化每次只能写进一个对象,你那文件里只有一个对象
每次都会覆盖的,
你要做什么作业吗,不是像你这么写的,建议多看书,这种问题也就我会耐心地回答你了
谢谢你!是作业,把学生类保存到文件,下一次运行的时候可以直接从文件中读取,我现在是想写几个对象进去,先写到集合,再把集合写入保存到文件,然后运行从文件输出哪几个对象。那怎么写呢?