serializable例子一则

最新推荐文章于 2021-04-04 08:36:40 发布

最新推荐文章于 2021-04-04 08:36:40 发布 · 194 阅读

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本文介绍了一个Java程序实现，该程序通过实现Serializable接口来序列化包含敏感信息的对象，并为transient字段提供自定义的加密处理方案。示例中使用Customer类演示了如何在序列化过程中加密密码字段并在反序列化时进行解密。

实现Serializable接口，编写地定义的针对transient field的加密处理方案。

package cxz.serial;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ObjectSaver {

	public static void main(String[] args) throws Exception {
		ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(
				"D:\\objectFile.obj"));

		Customer obj3 = new Customer("Tom", 20, "pwd");
		out.writeObject(obj3);
		out.close();

		ObjectInputStream in = new ObjectInputStream(new FileInputStream(
				"D:\\objectFile.obj"));
		Customer somebody = (Customer) in.readObject();
		in.close();
		System.out.println(somebody);
	}

}

package cxz.serial;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class Customer implements Serializable {
	private static int no;
	private String name;
	private transient String password;
	private int age;

	public Customer(String string, int i, String pwd) {
		name = string;
		age = i;
		password = pwd;
		no++;
	}

	public static int getNo() {
		return no;
	}

	public String toString() {
		return name + age + password + no;
	}

	private byte[] change(byte[] buff) {
		for (int i = 0; i < buff.length; i++) {
			int b = 0;
			for (int j = 0; j < 8; j++) {
				int bit = (buff[i] >> j & 1) == 0 ? 1 : 0;
				b += (1 << j) * bit;
			}
			buff[i] = (byte) b;
		}
		return buff;
	}

	private static final long serialVersionUID = -5990189113322816258L;

	private void readObject(ObjectInputStream in) throws IOException,
			ClassNotFoundException {
		in.defaultReadObject();
		byte[] buff = (byte[])in.readObject();
		password = new String(change(buff));
		no = in.readInt();
	}

	private void writeObject(ObjectOutputStream out) throws IOException {
		out.defaultWriteObject();
		out.writeObject(change(password.getBytes()));
		out.writeInt(no);
	}

}