如何在相同的接口方法上調用不同的遠程對象並維護自己的數據？ Java RMI
[英]How to call different remote objects on same interface method and maintain their own data? java RMI
問題描述
我有實現客戶端和服務器之間通用接口的服務器類。 我有多個遠程對象綁定到不同的rim注冊表（差異端口和rim_id）。 客戶端將基於clientID查找注冊表，例如，如果clientID為EXE1111，則它應連接到EXE服務器遠程對象。 我希望每個服務器對象都有自己的哈希表來存儲客戶端提供的數據。 這是服務器代碼：
enter code here
public class StationServers extends UnicastRemoteObject implements StationService{
private static final long serialVersionUID = 8119533223378875144L;
private String criminalRecordID="CR";
private String missingRecordID="MR";
private int count=11111;
protected StationServers() throws RemoteException {
super();
}
public static void main(String args[]){
try {
bindSPVMServer(new StationServers());
bindSPLServer(new StationServers());
bindSPBServer(new StationServers());
System.out.print("Servers are up and running on ");
System.out.println(InetAddress.getLocalHost().getHostName());
} catch (Exception e) {
System.err.println("Server start up error: "+e.getMessage());
e.printStackTrace();
}
}
private static void bindSPVMServer(StationServers spvmObject) {
try {
Registry reg = LocateRegistry.createRegistry(Constants.SPVM_RMI_PORT);
reg.bind(Constants.SPVM_RMI_ID, spvmObject);
} catch (Exception e) {
e.printStackTrace();
}
}
private static void bindSPLServer(StationServers splObject) {
try {
Registry reg = LocateRegistry.createRegistry(Constants.SPL_RMI_PORT);
reg.bind(Constants.SPL_RMI_ID, splObject);
} catch (Exception e) {
e.printStackTrace();
}
}
private static void bindSPBServer(StationServers spbObject) {
try {
Registry reg = LocateRegistry.createRegistry(Constants.SPB_RMI_PORT);
reg.bind(Constants.SPB_RMI_ID, spbObject);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void createCRecord(String firstName, String lastName,
String description, RecordStatus status) throws RemoteException {
}
@Override
public void createMRecord(String firstName, String lastName,
String address, String lastDate, String lastLocation,
RecordStatus status) throws RemoteException {
// TODO Auto-generated method stub
}
@Override
public String getRecordCounts() throws RemoteException {
// TODO Auto-generated method stub
return null;
}
@Override
public void editCRecord(String lastName, String recordID,
RecordStatus newStatus) throws RemoteException {
// TODO Auto-generated method stub
}
}
客戶代碼：：
enter code here
public class OfficerClients implements Runnable{
public static void showMenu() {
System.out.println("\n****Welcome to DPIS****\n");
System.out.println("Please select an option (1-5)");
System.out.println("1. Create Criminal Record");
System.out.println("2. Create Missing Record");
System.out.println("3. Get Records Count");
System.out.println("4. Edit Record");
System.out.println("5. Exit");
}
public static void main(String[] args) {
try {
if (System.getSecurityManager() == null)
System.setSecurityManager(new RMISecurityManager());
new Thread(new OfficerClients()).start();
} catch (Exception e) {
e.printStackTrace();
}
}
private static RecordStatus getRecordStatus(String status, int userChoice) {
if (userChoice == 1) {
if (RecordStatus.CAPTURED.name().equals(status))
return RecordStatus.CAPTURED;
else if (RecordStatus.ONTHERUN.name().equals(status))
return RecordStatus.ONTHERUN;
else
throw new IllegalArgumentException("Invalid status for Criminal Record");
} else if (userChoice == 2) {
if (RecordStatus.FOUND.name().equals(status))
return RecordStatus.FOUND;
else if (RecordStatus.MISSING.name().equals(status))
return RecordStatus.MISSING;
else
throw new IllegalArgumentException("Invalid status for Missing Record");
} else if (userChoice == 3) {
if (RecordStatus.CAPTURED.name().equals(status))
return RecordStatus.CAPTURED;
else if (RecordStatus.ONTHERUN.name().equals(status))
return RecordStatus.ONTHERUN;
else if (RecordStatus.FOUND.name().equals(status))
return RecordStatus.FOUND;
else if (RecordStatus.MISSING.name().equals(status))
return RecordStatus.MISSING;
}
throw new IllegalArgumentException("No Enum specified for this string");
}
private static StationService getRemoteObjectStub(String stationName) {
String url = "rmi://localhost:";
Remote lookup = null;
try {
if ("SPVM".equals(stationName))
url += Constants.SPVM_RMI_PORT;
else if ("SPL".equals(stationName))
url += Constants.SPL_RMI_PORT;
else if ("SPB".equals(stationName))
url += Constants.SPB_RMI_PORT;
url += "/" + stationName;
System.out.println("URL==" + url);
if (url != null && !url.isEmpty())
lookup = Naming.lookup(url);
} catch (Exception e) {
e.printStackTrace();
}
return (StationService) lookup;
}
@Override
public void run() {
int userChoice = 0;
String firstName = "", lastName = "", description = "", address = "", lastDate = "", lastLocation = "", badgeID = "", recStatus = "", recordID = "";
RecordStatus status;
String requestBadgeID = "Please enter your unique BadgeID: ";
String requestRecordID = "Please enter RecordID: ";
String requestFName = "First Name: ";
String requestLName = "Last Name: ";
String requestDesc = "Description of Crime: ";
String requestAddress = "Last Known Address: ";
String requestDate = "Date last seen: ";
String requestPlace = "Place last seen: ";
String requestStatus = "Status: ";
String requestNewStatus = "New Status: ";
showMenu();
BufferedReader br = new BufferedReader(new InputStreamReader(
System.in));
try{
while (true) {
Boolean valid = false;
System.out.print(requestBadgeID);
badgeID = br.readLine().toUpperCase();
System.out.println(badgeID);
String stationName = badgeID.replaceAll("[0-9]", "").trim();
System.out.println(stationName);
StationService server = getRemoteObjectStub(stationName);
while (!valid) {
try {
System.out.print("Enter your choice: ");
userChoice = Integer.parseInt(br.readLine());
valid = true;
} catch (Exception e) {
System.out
.println("Invalid Input, please enter an integer: ");
valid = false;
}
}
switch (userChoice) {
case 1:
System.out.print(requestFName);
firstName = br.readLine().trim().toUpperCase();
System.out.print(requestLName);
lastName = br.readLine().trim().toUpperCase();
System.out.print(requestDesc);
description = br.readLine().trim().toUpperCase();
System.out.print(requestStatus);
recStatus = br.readLine().trim().toUpperCase()
.replaceAll("\\s+", "");
status = getRecordStatus(recStatus, userChoice);
server.createCRecord(firstName, lastName, description,
status);
showMenu();
break;
case 2:
System.out.print(requestFName);
firstName = br.readLine().trim().toUpperCase();
System.out.print(requestLName);
lastName = br.readLine().trim().toUpperCase();
System.out.print(requestAddress);
address = br.readLine().trim().toUpperCase();
System.out.print(requestDate);
lastDate = br.readLine().trim().toUpperCase();
System.out.print(requestPlace);
lastLocation = br.readLine().trim().toUpperCase();
System.out.print(requestStatus);
recStatus = br.readLine().trim().toUpperCase()
.replaceAll("\\s+", "");
status = getRecordStatus(recStatus, userChoice);
server.createMRecord(firstName, lastName, requestAddress,
lastDate, lastLocation, status);
showMenu();
break;
case 3:
String recordCounts = server.getRecordCounts();
System.out.println(recordCounts);
showMenu();
break;
case 4:
System.out.print(requestLName);
lastName = br.readLine().trim().toUpperCase();
System.out.print(requestRecordID);
recordID = br.readLine().trim().toUpperCase();
System.out.print(requestNewStatus);
recStatus = br.readLine().trim().toUpperCase()
.replaceAll("\\s+", "");
status = getRecordStatus(recStatus, userChoice);
server.editCRecord(lastName, recordID, status);
showMenu();
break;
case 5:
System.out.println("Have a nice day!");
br.close();
System.exit(0);
default:
System.out.println("Invalid Input, please try again.");
}
}
}catch(Exception e){
e.printStackTrace();
}
}
}
我是RMI的新手，所以我不知道如何維護每個遠程對象並根據客戶端請求進行調用並將記錄存儲在哈希表中（每個遠程對象）。
請幫忙...
1 個解決方案
解決方案1
0 2013-09-22 23:58:40
您已經描述了大部分內容。 只需創建遠程對象的多個實例即可； 將每個人以不同的名稱綁定到注冊表中； 讓客戶每次想要該特定實例時都查找適當的名稱； 並通過該查詢返回的存根調用該方法。
答對了。
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