java transient 关键字的用处

最新推荐文章于 2024-08-28 09:49:32 发布

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本文通过一个具体的Java代码示例，演示了如何使用transient关键字来阻止对象中的某些成员变量在串行化过程中的保存。示例中创建了一个包含敏感信息的类，并在串行化和反串行化过程中观察到了transient关键字的效果。

1.transient用来防止对象下的成员变量被串行化

2.测试代码

package com.knife;

public class A implements java.io.Serializable {

	private static final long serialVersionUID = 1L;
	private String name;
	private transient String pw;

	public A(String name, String pw) {
		this.name = name;
		this.pw = pw;
	}

	public String toString() {
		return "[name:\"" + name + "\",pw:\"" + pw + "\"]";
	}
}

package com.knife;

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

public class Test {

	public static void main(String args[]) {
		A a = new A("knife", "123456");
		System.out.println(a.toString());
		try {
			ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("a.out"));
			o.writeObject(a);
			o.close();
		} catch (Exception e) {
		}
		try {
			ObjectInputStream in = new ObjectInputStream(new FileInputStream("a.out"));
			A a1 = (A) in.readObject();
			System.out.println(a1.toString());
		} catch (Exception e) {
		}
	}
}

3.结果

[name:"knife",pw:"123456"]
[name:"knife",pw:"null"]