看到网上很多博客都是写到transient修饰的变量不可以被序列化，
实际上其变量可以被序列化，《Java编程思想》上写的很清楚。

事实证明：看博客不如看书（看经典书籍），看书不如自己码代码验证

代码是借鉴别人的，为了验证问题，直接上代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class PasswordFormat implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private String name;
    private transient String password;
    public PasswordFormat(String name, String password) {
        this.name = name;
        this.password = password;
    }
    public PasswordFormat() {
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    private void writeObject(ObjectOutputStream oos) throws IOException {//重写以下两个方法，完成序列化时password的加密和解密
        oos.defaultWriteObject();
        char a[]=this.password.toCharArray();
        String str="";
        for(int i=0;i<a.length;i++){
            a[i]+=i;
            str+=a[i];
        }//各项加i再逆置；
        StringBuilder sb = new StringBuilder(str);
        oos.writeObject(sb.reverse().toString());
    }
    private void readObject(ObjectInputStream ois)
            throws ClassNotFoundException, IOException {
        ois.defaultReadObject();
        String str = (String) ois.readObject();
        System.out.println("解密后：" + str);
        StringBuilder sb = new StringBuilder(str);
        sb.reverse();
        char a[]=sb.toString().toCharArray();
        str="";
        for(int i=0;i<a.length;i++){
            a[i]-=i;
            str+=a[i];
        }
        this.password = str;
    }

    @Override
    public String toString() {
        return "PasswordFormat [name=" + name + ", password=" + password + "]";
    }
    public static void serializeTemp(PasswordFormat ob,File file){
        try(
                ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(file));
                ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
                ){
            oos.writeObject(ob);
            oos.flush();
            System.out.println((PasswordFormat)ois.readObject());
        }catch(IOException | ClassNotFoundException e){
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        PasswordFormat pf=new PasswordFormat("xcw","xcw12345678");
        File file=new File("./yj.txt");
        PasswordFormat.serializeTemp(pf,file);
    }
}

image

上图可以看到，只要重写writeObject和readObject，

• 非transinent修饰的变量使用defaultWriteObject()和defaultReadObject()进行序列化和反序列化
• transient修饰的变量必须手动使用writeObject()和readObject()进行序列化和反序列化