标签：ace exception 总结 无法获得 ble img his rip exce
在Java中，一个类只要实现Serializable接口，这个类的对象就可以被序列化，这种序列化模式为开发者提供了很多便利，我们可以不必关心具体序列化的过程，只要这个类实现了Serializable接口，这个类的所有属性都会自动序列化。但是有时我们需要让类的某些属性不被序列化，如密码这类信息，为了安全起见，不希望在网络操作中被传输或者持久化到本地。只要在相应的属性前加上transient关键字，就可以实现部分属性不被序列化，该属性的生命周期仅存于调用者的内存中而不会写入到磁盘持久化。
public class TransientTest {
public static void main(String[] args) {
User user = new User();
user.setUsername("Github");
user.setPassword("123456");
System.out.println("read before Serializable: ");
System.out.println("username: " + user.getUsername());
System.err.println("password: " + user.getPassword());
try {
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("user.txt"));
os.writeObject(user); // 将User对象写进文件
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
ObjectInputStream is = new ObjectInputStream(new FileInputStream("user.txt"));
user = (User) is.readObject(); // 从流中读取User的数据
is.close();
System.out.println("\nread after Serializable: ");
System.out.println("username: " + user.getUsername());
System.err.println("password: " + user.getPassword());
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}
}
public class User implements Serializable {
private static final long serialVersionUID = 1234567890L;
private String username;
private transient String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this