如何使数组列表可远程访问
我有一个项目，其中使用 Java RMI 使其他对象可以远程访问对象。我需要将以下类设为远程：
public interface MarketBB extends Remote
{
public ArrayList<CloudEntry> getMarketBB() throws RemoteException;
public void moveAMP(int fromCloud, int toCloud) throws RemoteException;
}
我遇到的问题是，由于 ArrayList 保存着 CloudEntry 对象，因此当从另一个对象调用 getMarketBB 方法时，不会返回任何内容。
有没有办法使 CloudEntry 类的 ArrayList 可以远程访问？
以下是 CloudEntry 类的代码：
public class CloudEntryImpl implements CloudEntry {
int cloudId;
String cloudName;
double speedGHz;
double costPerGhzH;
double commsCost;
double commsTime;
int noAMPs;
//constructor, get and set methods for fields
}
和 CloudEntry 接口：
public interface CloudEntry extends Remote {
public void setNoAmps(int noAmps) throws RemoteException;
public String getCloudName() throws RemoteException;
public String getCloudDetails() throws RemoteException;
}
I have a project where I am using Java RMI to make objects remotely accessible to other objects. I need to make the following class remote:
public interface MarketBB extends Remote
{
public ArrayList<CloudEntry> getMarketBB() throws RemoteException;
public void moveAMP(int fromCloud, int toCloud) throws RemoteException;
}
The problem that I have is that because the ArrayList is holding CloudEntry objects, when the getMarketBB method is called from another object, nothing is returned.
Is there a way of making the ArrayList of CloudEntry classes remotely accessible?
Here is the code for the CloudEntry class:
public class CloudEntryImpl implements CloudEntry {
int cloudId;
String cloudName;
double speedGHz;
double costPerGhzH;
double commsCost;
double commsTime;
int noAMPs;
//constructor, get and set methods for fields
}
And the CloudEntry interface:
public interface CloudEntry extends Remote {
public void setNoAmps(int noAmps) throws RemoteException;
public String getCloudName() throws RemoteException;
public String getCloudDetails() throws RemoteException;
}
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评论（2）
您的
CloudEntryImpl不可序列化。尝试将其更改为：Your
CloudEntryImplis not serializable. Try changing it to:getMarketBB() 返回 ArrayList 的副本。您不能让它返回列表的“实时”视图。
相反，我建议您提供与您尝试对列表执行的操作相匹配的方法。恕我直言，无论有没有 RMI，这都是最佳实践。
getMarketBB() returns a copy of the ArrayList. You cannot have it return a "live" view of the list.
Instead I would suggest you provide methods which match what you are trying to do with the list. IMHO This is best practice with or without RMI.