transient 关键字

主要是用于在序列化时的存储作用

  一般的字段在序列化后保存到本地磁盘中，当再次从本地磁盘中读取时可以重新获取到。

 但是在实体类中如果加上了 修饰符 transient  那么这个字段在保存到本地磁盘时不会被读取到，例如银行密码之类的数据不希望写入到磁盘中的数据可以用transient  。

public class DXWUser implements Serializable {

private static final long serialVersionUID = 3087341266247888811L;

private String name;

private transient String password;

DXWUser(String name,String password){
this.name = name;
this.password = password;
}
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;
}

public String toString(){

return name+","+password;
}
}

DXWUser user = new DXWUser("zhangsan","11111222");
System.out.println(user.toString());
try {
ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream(new File("D:/log.out")));
o.writeObject(user);
o.close();
} catch (Exception e) {
e.printStackTrace();
}

try {
ObjectInputStream op = new ObjectInputStream(new FileInputStream(new File("D:/log.out")));
DXWUser duser = (DXWUser) op.readObject();
System.out.println(duser.toString());
} catch (Exception e) {
e.printStackTrace();

}

两次的输出结果 分别为

zhangsan,11111222

zhangsan,NOT SET