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?? ?? ??? ??? ???? ?? ?? ?? ? ?? ??? ??? ? ?? ??? ???? ?? ?????. ?? ?? RESTful API?? ???? ??? ?? ???? ??? ?? ???? ?? ??, ?? ?? ? ??? ???? ?? ???? ???? ? ? ????. ??? ? ??? ??? ??? ???? ?? ??? ? ???? ??? ?? ??? ???? ??? ? ????. ? ??? ??? ???? ?? ??? ??? ???? ?? ??? ?? ??? ??? ???? ?? ???? ?????? ?????.
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CoR ??? ???, ???? ???, ??????? ? ?? ?? ????? ?????. Handler? ?? ??? ?? ?????? ???? ??? ?? ???? ?? ??? ?????. ? ??? ???? ?? ??? ?? ??? ?? ??? ???? ??? ???? ??? ?? ???? ???? ?????. ?????? ??? ??? ??? ??? ????? ?? ???? ??? ???? ?? ????. ??? ??? ??? ???? ?? ???? ???? ??????.
Java??? ?? ?
1??: ??? ????? ??
?? ?? ???? ???? ??? ???? ?? ???? ??? RequestHandler ?????? ?????.
abstract class RequestHandler { protected RequestHandler nextHandler; public void setNext(RequestHandler nextHandler) { this.nextHandler = nextHandler; } public void handleRequest(Request request) { if (nextHandler != null) { nextHandler.handleRequest(request); } } }
2??: ???? ??? ??
????, RequestHandler ???? ???? ???? ??? ???? ???????. ? ???? ?? ??? ?? ??? ?????.
class AuthenticationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isAuthenticated()) { System.out.println("Authentication successful."); super.handleRequest(request); } else { System.out.println("Authentication failed."); request.setValid(false); } } } class AuthorizationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isAuthorized()) { System.out.println("Authorization successful."); super.handleRequest(request); } else { System.out.println("Authorization failed."); request.setValid(false); } } } class DataValidationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isDataValid()) { System.out.println("Data validation successful."); super.handleRequest(request); } else { System.out.println("Data validation failed."); request.setValid(false); } } } class BusinessLogicHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isValid()) { System.out.println("Processing business logic..."); // Perform the main business logic here } else { System.out.println("Request is invalid. Cannot process business logic."); } } }
3??: ?? ??
?? ??? ?? ??? ??? ???????.
public class RequestProcessor { private RequestHandler chain; public RequestProcessor() { // Create handlers RequestHandler authHandler = new AuthenticationHandler(); RequestHandler authzHandler = new AuthorizationHandler(); RequestHandler validationHandler = new DataValidationHandler(); RequestHandler logicHandler = new BusinessLogicHandler(); // Set up the chain authHandler.setNext(authzHandler); authzHandler.setNext(validationHandler); validationHandler.setNext(logicHandler); this.chain = authHandler; // Start of the chain } public void processRequest(Request request) { chain.handleRequest(request); } }
4??: ????? ??
????? ??? ?? ?? ??? ?? ???? ??? ??? ????.
abstract class RequestHandler { protected RequestHandler nextHandler; public void setNext(RequestHandler nextHandler) { this.nextHandler = nextHandler; } public void handleRequest(Request request) { if (nextHandler != null) { nextHandler.handleRequest(request); } } }
?? ???
??? ?? ???? ????? ? ??? ??? ?? ??????.
class AuthenticationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isAuthenticated()) { System.out.println("Authentication successful."); super.handleRequest(request); } else { System.out.println("Authentication failed."); request.setValid(false); } } } class AuthorizationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isAuthorized()) { System.out.println("Authorization successful."); super.handleRequest(request); } else { System.out.println("Authorization failed."); request.setValid(false); } } } class DataValidationHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isDataValid()) { System.out.println("Data validation successful."); super.handleRequest(request); } else { System.out.println("Data validation failed."); request.setValid(false); } } } class BusinessLogicHandler extends RequestHandler { @Override public void handleRequest(Request request) { if (request.isValid()) { System.out.println("Processing business logic..."); // Perform the main business logic here } else { System.out.println("Request is invalid. Cannot process business logic."); } } }
?? ??
????? ??? ???? ?? ??? ? ? ????.
public class RequestProcessor { private RequestHandler chain; public RequestProcessor() { // Create handlers RequestHandler authHandler = new AuthenticationHandler(); RequestHandler authzHandler = new AuthorizationHandler(); RequestHandler validationHandler = new DataValidationHandler(); RequestHandler logicHandler = new BusinessLogicHandler(); // Set up the chain authHandler.setNext(authzHandler); authzHandler.setNext(validationHandler); validationHandler.setNext(logicHandler); this.chain = authHandler; // Start of the chain } public void processRequest(Request request) { chain.handleRequest(request); } }
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Javanio? Java 1.4? ?? ? ??? IOAPI???. 1) ?? ? ??? ?????, 2) ??, ?? ? ??? ?? ?? ??, 3) ? ??? ??? ???? 4) ?? ??? ?? IO?? ? ????? ?????. 1) ? ?? IO? ??? ?? ??? ???, 2) ??? ??? ?? ???? ?????, 3) ???? ?????? ???? 4) ??? ?? ??? ?? ?? ? ??? ?????. 1) ??? ??/??? ??? ?? ?????, 2) ???? ???? ???? ?? ???? ???????. 3) ??? ??? ??? ???????.

?? ?? Java? ?? ???? ?? ? ? ? ????? ????, ? ??? ??? ??? ??? ???? ? ????. 1. ?? ?? hashcode () ???? ???? ?? ?? ???? ?? ??? ?? ?? ???? ?????. 2. ?? ??? ??? ?? ?? ???? ??? ??? ? ????. ?? ??? ?? ? ??? ??? ?????. JDK8 ? ?? ? ??? ?? ?? (?? ?? 8) ??? ????? ?? ???? ?? ? ??? ?????. 3. ??? ?? ???? ?? ???? ?? equals () ? hashcode () ???? ?? ???????. 4. ?? ?? ??? ???? ?????. ?? ?? ??? ???? ?? ?? (?? 0.75)? ??? ?? ? ???; 5. ?? ?? ??? ??? ??? Multithreaded?? Concu? ???????.

Java? Singleton Design Pattern? ???? ??? ???? ? ?? ?? ??? ? ?? ??? ?? ??? ??? ???? ???? ?? ???? ?? ???? ???? ??? ?????. ?? ???? ??? ?????. 1. ?????, ? ????? ? ?? ??? ?? ? ?? ????, ?? ?? ??? ?? ??? ???? ?? ??? ?????. 2. ???-?? ??, ??? ?? ?? ?? ?? ??? ?? ?? ??? ???? ??? ???? ? ???? ?? ??? ????. 3. ??? ?? ?? ????? ?? ????? ??? ??? ?? ??? ? ??? ??? ?? ?? ????? ?????. 4. ?? ??? ???? ???, ??? ??? ? ?? ??? ???? ?? ??? ???? ??? ??? ?????. ?? ??? ?? ?? ?? ??? ??? ? ????.

?? ??? ??? ???? ???? ? ??? ?? ?? ???? ?? ? ????. 1. ??. ofnullable? null ??? ??? ???? ?????. ?? ??, ??? ?? ??? ? Orelse? ???? ???? ? ???? ??? ???? ?????. 2. ?? ?? ?? ???? ?? ?? ???? NPE? ???? ??? ??? ??? ???? ???? ???? ?????. 3. ??? ??? ???? ??? ? ???, ??? ???? ???? ?? ??? ?? ?????. ??? ??? ??? ???? ??? ??? Orelse? ?? ?????. 4. ?? ???? ??? ??? ?? ??? ??? ???? ???? ?? ???? ???? ???? ?? ??? ?? ????? NU? ?? ?????.

java.io.notserializableException? ????? ?? ?? ??? ??? ???? ?? ???? ??? ??? ?????? ???? ?? ? ??? ??? ??? ????? ???? ????. 1. ?? ???? ??? ??????. 2. ???? ?? ??? ?? ???? ??? ??? ?????????. 3. ??? ? ????? ?? ??? ??? ??????. 4. ?? ?? ?? ? ???? ? ??? ??? ??????. 5. ?????? ???? ?? ???? ??????. 6. ? ??? ?? ?? ??? ??? ?? ?? ??? ?? ??? ??? ???? ?? ??? ??????. 7. ??? ??????

???? ???? StringBuilder? ?? ???? ???-??? ??? StringBuffer? ?? ???? ??? ?????. 1. ???? ??? ?? ? ? ??? ??? ? ??? ?? ?????. 2. StringBuilder? ?? ???? ??? ??? ???? ???? ????. 3. StringBuffer? ?? ??? ?? ????? ????? ??? ?? ????. 4. ?? ??? ????? ???? ???? ??? ? ??? ?? ???? ??? ??? ?? ? ? ????.

Java? ?? ??? ??? ????? ?? ? ???? ???? ???? ???? ???? ????. 1. ???? ?? ?? ??? ?? ???? ???? InputStreamReader ? OutputStreamWriter? ???? ??? ?? ???? ???? ??? ?? ? ?? ??? ??????. 2. ???? ???? ???? ?? ? ? ?? ?? ??????? ??? ??? ?? ??? ???? ?????? ???? ?? ??? ??????. 3. String.getBytes () ? Newstring (byte [])????? ???? ??? ??? ?? ??? ??? ??? ?? ?? Standardcharsets.utf_8? ???? ??????. ???,

Javasocket ?????? ???? ??? ????, ?????? ?? ?? ??? ??? ??? ?? ?????. 1. Java? ??? ?????? ???? ?? ???? ???? ???? ?? ?? ???? ????. 2. ?? ????? ??? ? ?? ?? ?? ??? ??? ?? ?????? ??? ???????. 3. ?????? ?????? ?? ??, ??? ?? ? ?? ? ??? ??? ?????. 4. ?? ???? ?? ??? ??? IP ??? ???? ????, ??? ????? ????, ?? ?????? ???? ?? ?????. ???? ????? ?? ???? ?? ??? ??? ? ????.
