Java 无法写入/读取包含对象列表的文件
我试图将对象列表保存到文件中,但每当我尝试从文件中读取时,总是失败。有人能告诉我我做错了什么吗 向它写入内容Java 无法写入/读取包含对象列表的文件,java,android,object,file-io,Java,Android,Object,File Io,我试图将对象列表保存到文件中,但每当我尝试从文件中读取时,总是失败。有人能告诉我我做错了什么吗 向它写入内容 public void writeToFile(List<EventsClass> list) { String filename = "events.srl"; ObjectOutput out = null; try { out = new ObjectOutputStream(new FileOutputStream(n
public void writeToFile(List<EventsClass> list)
{
String filename = "events.srl";
ObjectOutput out = null;
try
{
out = new ObjectOutputStream(new FileOutputStream(new File(getFilesDir(),"")+File.separator+filename));
out.writeObject(list);
out.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
public List<EventsClass> readFromFile()
{
ObjectInputStream input;
String filename = "events.srl";
try
{
input = new ObjectInputStream(new FileInputStream(new File(new File(getFilesDir(),"")+File.separator+filename)));
List<EventsClass> list = (List<EventsClass>) input.readObject();
input.close();
return list;
}
catch (IOException | ClassNotFoundException e)
{
e.printStackTrace();
return null;
}
}
是的,EventsClass需要可序列化才能写入存储。如果您让它实现了
java.io.Serializable
,那么所有这些都应该可以很好地为您服务。您对java序列化有了更多的了解。对其进行了更新,向您展示了EventsClass。我通常使用SharedReferences,这是我第一次用Java实现文件I/o系统。你没有stacktrace?不需要<代码>事件类不可序列化;对象未被写入,因此无法读取
public class EventsClass
{
private String eventName;
private String eventClass;
private String eventDate;
private int eventMonth;
private int eventDay;
public EventsClass(String eventClass, String eventName, String eventDate, int eventMonth, int eventDay)
{
this.eventClass = eventClass;
this.eventName = eventName;
this.eventDate = eventDate;
this.eventMonth = eventMonth;
this.eventDay = eventDay;
}
public void putEventData(String mClass, String name, String date, int month, int day)
{
this.eventClass = mClass;
this.eventName = name;
this.eventDate = date;
this.eventMonth = month;
this.eventDay = day;
}
public String getEventClass()
{
return eventClass;
}
public String getEventName()
{
return eventName;
}
public String getEventDate()
{
return eventDate;
}
public int getEventMonth()
{
return eventMonth;
}
public int getEventDay()
{
return eventDay;
}
}