摘要：在这篇文章中，我们将看到如何从java中读取对象。在上一篇文章中，我们已经看到了如何将客体写入文件并创建employee。现在在这篇文章中，我们将阅读相同的文件并检索Employee对象。

从文件中读取对象的Steos是：使用ObjectInputStream从文件读取对象可以被称为反序列化。

1.Employee.java

package cn.micai.io;

import java.io.Serializable;

/**
 * 描述：
 * <p>
 *
 * @author: 赵新国
 * @date: 2018/6/7 12:10
 */
public class Employee implements Serializable {

    private static final long serialVersionUID = 1L;
    int employeeId;
    String employeeName;
    String department;

    public int getEmployeeId() {
        return employeeId;
    }
    public void setEmployeeId(int employeeId) {
        this.employeeId = employeeId;
    }
    public String getEmployeeName() {
        return employeeName;
    }
    public void setEmployeeName(String employeeName) {
        this.employeeName = employeeName;
    }
    public String getDepartment() {
        return department;
    }
    public void setDepartment(String department) {
        this.department = department;
    }
}

2.DeserializeMain.java

package cn.micai.io;

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

/**
 * 描述：
 * <p>
 *
 * @author: 赵新国
 * @date: 2018/6/7 12:13
 */
public class DeserializeMain {

    public static void main(String [] args) {
        Employee emp = null;
        try {
            FileInputStream inputStream = new FileInputStream("D://employee.ser");
            ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
            emp = (Employee) objectInputStream.readObject();
            objectInputStream.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
            return;
        } catch (ClassNotFoundException e) {
            System.out.println("Employee class not found");
            e.printStackTrace();
            return;
        }
        System.out.println("Deserialized Employee...");
        System.out.println("Emp id: " + emp.getEmployeeId());
        System.out.println("Name: " + emp.getEmployeeName());
        System.out.println("Department: " + emp.getDepartment());
    }
}

3.运行结果：

How to read object from a file in java_java反序列化