java的transient关键字为我们提供了便利，你只需要实现Serilizable接口，将不需要序列化的属性前添加关键字transient，序列化对象的时候，这个属性就不会序列化到指定的目的地中。

     

package test;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.Serializable;public class Test {	public static void main(String[] args) throws FileNotFoundException,			IOException, ClassNotFoundException {		A a = new A(25, "张三");		System.out.println(a);						ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("c://mm.txt"));		oos.writeObject(a);		oos.close();		ObjectInputStream ois = new ObjectInputStream(new FileInputStream("c://mm.txt"));		a = (A) ois.readObject();		System.out.println(a);	}}class A implements Serializable {	int a;	transient String b; //transient  使b属性没有进行序列化	public A(int a, String b) {		this.a = a;		this.b = b;	}	public String toString() {		return "a = " + a + ",b = " + b;	}}

　运行结果：

a = 25,b = 张三a = 25,b = null