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借书/还书/续借/逾期管理

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Zzzz
2026-04-27 21:19:23 +08:00
parent 38b31ddbb9
commit 7502890a77
27 changed files with 2535 additions and 31 deletions
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src/main/java/com/mzh/library/controller/BorrowingManagementServlet.java
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package com.mzh.library.controller;
import com.mzh.library.dao.impl.JdbcBorrowRecordDao;
import com.mzh.library.entity.AuthenticatedUser;
import com.mzh.library.entity.BorrowRecord;
import com.mzh.library.entity.BorrowRecordSearchCriteria;
import com.mzh.library.entity.BorrowRecordStatus;
import com.mzh.library.service.ServiceResult;
import com.mzh.library.service.impl.BorrowingServiceImpl;
import com.mzh.library.util.SessionAttributes;
import java.io.IOException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class BorrowingManagementServlet extends HttpServlet {
private static final String MANAGE_JSP = "/WEB-INF/jsp/borrowing/manage.jsp";
private static final String FORM_JSP = "/WEB-INF/jsp/borrowing/form.jsp";
private static final String UNAUTHORIZED_JSP = "/WEB-INF/jsp/auth/unauthorized.jsp";
private static final String FLASH_SUCCESS = "flashSuccess";
private static final String FLASH_ERROR = "flashError";
private BorrowingServiceImpl borrowingService;
@Override
public void init() {
this.borrowingService = new BorrowingServiceImpl(new JdbcBorrowRecordDao());
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = request.getServletPath();
if ("/borrowing/new".equals(path)) {
renderForm(request, response, Collections.emptyMap(), Collections.emptyMap(), null);
return;
}
if (!"/borrowing".equals(path)) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
showManagementList(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String path = request.getServletPath();
if ("/borrowing/create".equals(path)) {
createBorrowRecord(request, response);
return;
}
if ("/borrowing/return".equals(path)) {
returnBook(request, response);
return;
}
if ("/borrowing/renew".equals(path)) {
renewLoan(request, response);
return;
}
response.sendError(HttpServletResponse.SC_NOT_FOUND);
}
private void showManagementList(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
BorrowRecordSearchCriteria criteria = searchCriteria(request);
request.setAttribute("criteria", criteria);
request.setAttribute("statuses", BorrowRecordStatus.values());
request.setAttribute("overdueStatus", BorrowRecordSearchCriteria.OVERDUE_STATUS);
request.setAttribute("maxRenewals", borrowingService.getMaxRenewals());
applyFlash(request);
ServiceResult<List<BorrowRecord>> result = borrowingService.searchRecords(currentUser(request), criteria);
if (isPermissionDenied(result)) {
forwardDenied(request, response, result.getMessage());
return;
}
request.setAttribute("borrowRecords", result.isSuccessful() ? result.getData() : Collections.emptyList());
if (!result.isSuccessful()) {
request.setAttribute("errorMessage", result.getMessage());
request.setAttribute("errors", result.getErrors());
}
request.getRequestDispatcher(MANAGE_JSP).forward(request, response);
}
private void createBorrowRecord(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Map<String, String> values = formValues(request);
ServiceResult<Long> result = borrowingService.borrowBook(currentUser(request),
values.get("readerIdentifier"), values.get("bookIdentifier"));
if (isPermissionDenied(result)) {
forwardDenied(request, response, result.getMessage());
return;
}
if (!result.isSuccessful()) {
renderForm(request, response, values, result.getErrors(), result.getMessage());
return;
}
flashSuccess(request, result.getMessage());
response.sendRedirect(request.getContextPath() + "/borrowing");
}
private void returnBook(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
long id = requiredLong(request.getParameter("id"), -1L);
ServiceResult<Void> result = id <= 0
? ServiceResult.failure("Select a valid borrowing record.")
: borrowingService.returnBook(currentUser(request), id);
redirectWithResult(request, response, result);
}
private void renewLoan(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
long id = requiredLong(request.getParameter("id"), -1L);
ServiceResult<Void> result = id <= 0
? ServiceResult.failure("Select a valid borrowing record.")
: borrowingService.renewLoan(currentUser(request), id);
redirectWithResult(request, response, result);
}
private void redirectWithResult(HttpServletRequest request, HttpServletResponse response, ServiceResult<?> result)
throws IOException, ServletException {
if (isPermissionDenied(result)) {
forwardDenied(request, response, result.getMessage());
return;
}
if (result.isSuccessful()) {
flashSuccess(request, result.getMessage());
} else {
flashError(request, messageFor(result));
}
response.sendRedirect(request.getContextPath() + "/borrowing");
}
private void renderForm(HttpServletRequest request, HttpServletResponse response, Map<String, String> formValues,
Map<String, String> errors, String errorMessage)
throws ServletException, IOException {
request.setAttribute("formValues", formValues);
request.setAttribute("errors", errors);
if (errorMessage != null && !errorMessage.isEmpty()) {
request.setAttribute("errorMessage", errorMessage);
}
request.getRequestDispatcher(FORM_JSP).forward(request, response);
}
private BorrowRecordSearchCriteria searchCriteria(HttpServletRequest request) {
return new BorrowRecordSearchCriteria(
request.getParameter("readerIdentifier"),
request.getParameter("bookIdentifier"),
request.getParameter("status")
);
}
private Map<String, String> formValues(HttpServletRequest request) {
Map<String, String> values = new LinkedHashMap<>();
values.put("readerIdentifier", trim(request.getParameter("readerIdentifier")));
values.put("bookIdentifier", trim(request.getParameter("bookIdentifier")));
return values;
}
private long requiredLong(String value, long fallback) {
try {
long parsed = Long.parseLong(trim(value));
return parsed > 0 ? parsed : fallback;
} catch (NumberFormatException ex) {
return fallback;
}
}
private String messageFor(ServiceResult<?> result) {
if (result.getMessage() != null && !result.getMessage().isEmpty()) {
return result.getMessage();
}
if (result.hasErrors()) {
return result.getErrors().values().iterator().next();
}
return "Borrowing action failed.";
}
private boolean isPermissionDenied(ServiceResult<?> result) {
return !result.isSuccessful()
&& "You do not have permission to manage borrowing.".equals(result.getMessage());
}
private void forwardDenied(HttpServletRequest request, HttpServletResponse response, String message)
throws ServletException, IOException {
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
request.setAttribute("errorMessage", message);
request.getRequestDispatcher(UNAUTHORIZED_JSP).forward(request, response);
}
private AuthenticatedUser currentUser(HttpServletRequest request) {
HttpSession session = request.getSession(false);
Object value = session == null ? null : session.getAttribute(SessionAttributes.AUTHENTICATED_USER);
return value instanceof AuthenticatedUser ? (AuthenticatedUser) value : null;
}
private void applyFlash(HttpServletRequest request) {
HttpSession session = request.getSession(false);
if (session == null) {
return;
}
moveFlash(session, request, FLASH_SUCCESS, "successMessage");
moveFlash(session, request, FLASH_ERROR, "errorMessage");
}
private void moveFlash(HttpSession session, HttpServletRequest request, String sessionKey, String requestKey) {
Object value = session.getAttribute(sessionKey);
if (value != null) {
request.setAttribute(requestKey, value);
session.removeAttribute(sessionKey);
}
}
private void flashSuccess(HttpServletRequest request, String message) {
request.getSession().setAttribute(FLASH_SUCCESS, message);
}
private void flashError(HttpServletRequest request, String message) {
request.getSession().setAttribute(FLASH_ERROR, message);
}
private String trim(String value) {
return value == null ? "" : value.trim();
}
}
src/main/java/com/mzh/library/controller/ReaderLoanHistoryServlet.java
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package com.mzh.library.controller;
import com.mzh.library.dao.impl.JdbcBorrowRecordDao;
import com.mzh.library.entity.AuthenticatedUser;
import com.mzh.library.entity.BorrowRecord;
import com.mzh.library.service.ServiceResult;
import com.mzh.library.service.impl.BorrowingServiceImpl;
import com.mzh.library.util.SessionAttributes;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class ReaderLoanHistoryServlet extends HttpServlet {
private static final String HISTORY_JSP = "/WEB-INF/jsp/reader/loans.jsp";
private static final String UNAUTHORIZED_JSP = "/WEB-INF/jsp/auth/unauthorized.jsp";
private static final String HISTORY_DENIED_MESSAGE = "You do not have permission to view loan history.";
private BorrowingServiceImpl borrowingService;
@Override
public void init() {
this.borrowingService = new BorrowingServiceImpl(new JdbcBorrowRecordDao());
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ServiceResult<List<BorrowRecord>> result = borrowingService.listCurrentReaderHistory(currentUser(request));
if (isPermissionDenied(result)) {
forwardDenied(request, response, result.getMessage());
return;
}
request.setAttribute("borrowRecords", result.isSuccessful() ? result.getData() : Collections.emptyList());
if (result.isSuccessful() && result.getMessage() != null && !result.getMessage().isEmpty()) {
request.setAttribute("successMessage", result.getMessage());
}
if (!result.isSuccessful()) {
request.setAttribute("errorMessage", result.getMessage());
}
request.getRequestDispatcher(HISTORY_JSP).forward(request, response);
}
private boolean isPermissionDenied(ServiceResult<?> result) {
return !result.isSuccessful() && HISTORY_DENIED_MESSAGE.equals(result.getMessage());
}
private void forwardDenied(HttpServletRequest request, HttpServletResponse response, String message)
throws ServletException, IOException {
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
request.setAttribute("errorMessage", message);
request.getRequestDispatcher(UNAUTHORIZED_JSP).forward(request, response);
}
private AuthenticatedUser currentUser(HttpServletRequest request) {
HttpSession session = request.getSession(false);
Object value = session == null ? null : session.getAttribute(SessionAttributes.AUTHENTICATED_USER);
return value instanceof AuthenticatedUser ? (AuthenticatedUser) value : null;
}
}