Java File Write an Object 将对象写入到文件

本例以Windows, JDK1.7 为基础，来演示使用Java 将对象写入到文件。
Java 提供ObjectOutputStream类可以用于对对象的操作，这里使用writeObject(Object obj)方法。
注意：写入对象必须实现java.io.Serializable接口

写入对象到文件

对象

Student.java

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;
	}
	
	
}

写入

FileObjectWrite.java

package com.devnp.io;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class FileObjectWrite {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Student student = new Student("Du Liu", 26);
		
		writeObj(student);
	}
	
	public static void writeObj(Student student){
		
		FileOutputStream fout = null;
		ObjectOutputStream oos = null;
		
		try {

			fout = new FileOutputStream("D:\\Person-Test\\temp\\sudent.txt");
			oos = new ObjectOutputStream(fout);
			oos.writeObject(student);

			System.out.println("Write " + student.getClass().getName() + " is Success.");

		} catch (Exception ex) {

			ex.printStackTrace();

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

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

}

异常

1. java.io.NotSerializableException

对象需要实现java.io.Serializable接口

参考

1. ObjectOutputStream