Java File Read an Object 从文件中读取对象

本例以Windows, JDK1.7 为基础，来演示使用Java 从文件中读取对象。
Java 提供ObjectInputStream类可以用于对对象的操作，这里使用readObject()方法。

注意：对象必须实现java.io.Serializable接口

读取对象

Student对象

package com.devnp.io;

import java.io.Serializable;

public class Student  implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private String name ;
	
	private Integer age ;

	
	public Student() {
		super();
	}

	public Student(String name, Integer age) {
		super();
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}
	
	
}

读取对象

package com.devnp.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

public class FileObjectRead {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Student student = readObj(new File("D:\\Person-Test\\temp\\sudent.txt"));
		
		System.out.println("Sudent Name : " + student.getName() + ", Age : " + student.getAge());
	}

	public static Student readObj(File file) {
		FileInputStream fin = null;
		ObjectInputStream ois = null;

		Student student = null;
		try {

			fin = new FileInputStream(file);
			ois = new ObjectInputStream(fin);
			student = (Student) ois.readObject();

		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			try {
				if (fin != null)
					fin.close();
			} catch (IOException e) {
				e.printStackTrace();
			}

			try {
				if (ois != null)
					ois.close();
			} catch (IOException e) {
				e.printStackTrace();
			}

		}

		return student;

	}

}

运行结果

Sudent Name : Du Liu, Age : 26

相关

关于写入对象到文件可以参阅 Java File Write an Object 将对象写入到文件

参考

ObjectInputStream