前端优化
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Zzzz
@@ -1,9 +1,37 @@
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package com.mzh.library.controller;
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import com.mzh.library.dao.impl.JdbcBookDao;
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import com.mzh.library.dao.impl.JdbcBorrowRecordDao;
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import com.mzh.library.dao.impl.JdbcReaderDao;
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import com.mzh.library.dao.impl.JdbcReportDao;
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import com.mzh.library.entity.AuthenticatedUser;
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import com.mzh.library.entity.Book;
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import com.mzh.library.entity.BookCategory;
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import com.mzh.library.entity.BookSearchCriteria;
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import com.mzh.library.entity.BookStatus;
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import com.mzh.library.entity.BorrowRecord;
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import com.mzh.library.entity.BorrowRecordSearchCriteria;
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import com.mzh.library.entity.BorrowingSummary;
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import com.mzh.library.entity.InventorySummary;
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import com.mzh.library.entity.Reader;
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import com.mzh.library.entity.ReaderSearchCriteria;
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import com.mzh.library.entity.ReportCenter;
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import com.mzh.library.entity.Role;
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import com.mzh.library.service.BookService;
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import com.mzh.library.service.BorrowingService;
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import com.mzh.library.service.ReaderService;
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import com.mzh.library.service.ReportService;
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import com.mzh.library.service.ServiceResult;
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import com.mzh.library.service.impl.BookServiceImpl;
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import com.mzh.library.service.impl.BorrowingServiceImpl;
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import com.mzh.library.service.impl.ReaderServiceImpl;
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import com.mzh.library.service.impl.ReportServiceImpl;
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import com.mzh.library.util.SessionAttributes;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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@@ -14,13 +42,200 @@ import javax.servlet.http.HttpSession;
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public class DashboardServlet extends HttpServlet {
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private static final String DASHBOARD_JSP = "/WEB-INF/jsp/dashboard.jsp";
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private BookService bookService;
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private BorrowingService borrowingService;
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private ReaderService readerService;
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private ReportService reportService;
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@Override
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public void init() {
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this.bookService = new BookServiceImpl(new JdbcBookDao());
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this.borrowingService = new BorrowingServiceImpl(new JdbcBorrowRecordDao());
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this.readerService = new ReaderServiceImpl(new JdbcReaderDao());
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this.reportService = new ReportServiceImpl(new JdbcReportDao());
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}
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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HttpSession session = request.getSession(false);
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AuthenticatedUser user = session == null
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? null
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: (AuthenticatedUser) session.getAttribute(SessionAttributes.AUTHENTICATED_USER);
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AuthenticatedUser user = currentUser(request);
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request.setAttribute("currentUser", user);
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ServiceResult<List<BookCategory>> categoryResult = bookService.listCategories();
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request.setAttribute("categories", categoryResult.isSuccessful()
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? listOrEmpty(categoryResult.getData())
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: Collections.emptyList());
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if (!categoryResult.isSuccessful()) {
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setErrorMessage(request, categoryResult.getMessage());
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}
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ServiceResult<List<Book>> bookResult = bookService.searchBooks(new BookSearchCriteria());
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List<Book> dashboardBooks = bookResult.isSuccessful()
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? listOrEmpty(bookResult.getData())
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: Collections.emptyList();
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request.setAttribute("dashboardBooks", dashboardBooks);
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if (!bookResult.isSuccessful()) {
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setErrorMessage(request, bookResult.getMessage());
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}
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List<DashboardMetric> metrics = Collections.emptyList();
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if (isStaff(user)) {
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Integer readerTotal = null;
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ServiceResult<List<Reader>> readerResult = readerService.searchReaders(new ReaderSearchCriteria());
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if (readerResult.isSuccessful()) {
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readerTotal = listOrEmpty(readerResult.getData()).size();
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} else {
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setErrorMessage(request, readerResult.getMessage());
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}
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ServiceResult<ReportCenter> reportResult = reportService.loadReportCenter(user);
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if (reportResult.isSuccessful()) {
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ReportCenter reportCenter = reportResult.getData();
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request.setAttribute("reportCenter", reportCenter);
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metrics = metricsFromReport(reportCenter, readerTotal);
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} else {
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setErrorMessage(request, reportResult.getMessage());
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}
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ServiceResult<List<BorrowRecord>> borrowResult =
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borrowingService.searchRecords(user, new BorrowRecordSearchCriteria());
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request.setAttribute("dashboardBorrowRecords", borrowResult.isSuccessful()
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? listOrEmpty(borrowResult.getData())
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: Collections.emptyList());
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if (!borrowResult.isSuccessful()) {
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setErrorMessage(request, borrowResult.getMessage());
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}
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}
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if (metrics.isEmpty() && bookResult.isSuccessful()) {
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metrics = metricsFromBooks(dashboardBooks);
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}
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request.setAttribute("dashboardMetrics", metrics);
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request.getRequestDispatcher(DASHBOARD_JSP).forward(request, response);
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}
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private AuthenticatedUser currentUser(HttpServletRequest request) {
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HttpSession session = request.getSession(false);
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Object value = session == null ? null : session.getAttribute(SessionAttributes.AUTHENTICATED_USER);
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return value instanceof AuthenticatedUser ? (AuthenticatedUser) value : null;
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}
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private boolean isStaff(AuthenticatedUser user) {
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return user != null && (user.getRole() == Role.ADMINISTRATOR || user.getRole() == Role.LIBRARIAN);
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}
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private <T> List<T> listOrEmpty(List<T> values) {
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return values == null ? Collections.emptyList() : values;
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}
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private List<DashboardMetric> metricsFromReport(ReportCenter reportCenter, Integer readerTotal) {
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if (reportCenter == null) {
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return Collections.emptyList();
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}
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InventorySummary inventory = reportCenter.getInventorySummary();
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BorrowingSummary borrowing = reportCenter.getBorrowingSummary();
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List<DashboardMetric> metrics = new ArrayList<>();
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metrics.add(new DashboardMetric("馆藏总册", valueOf(inventory, MetricField.TOTAL_COPIES), "册", "来自报表中心"));
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metrics.add(new DashboardMetric("当前借出", valueOf(borrowing, MetricField.ACTIVE_LOANS), "册", "实时借阅记录"));
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metrics.add(new DashboardMetric("逾期借阅", valueOf(borrowing, MetricField.OVERDUE_LOANS), "册", "需跟进记录"));
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if (readerTotal == null) {
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metrics.add(new DashboardMetric("可借册数", valueOf(inventory, MetricField.AVAILABLE_COPIES),
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"册", "馆藏可借库存"));
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} else {
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metrics.add(new DashboardMetric("读者总数", readerTotal, "人", "实时读者档案"));
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}
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return metrics;
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}
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private List<DashboardMetric> metricsFromBooks(List<Book> books) {
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int totalTitles = 0;
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int totalCopies = 0;
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int availableCopies = 0;
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int unavailableOrEmptyTitles = 0;
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for (Book book : books) {
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totalTitles++;
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totalCopies += book.getTotalCopies();
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availableCopies += book.getAvailableCopies();
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if (book.getStatus() != BookStatus.AVAILABLE || book.getAvailableCopies() <= 0) {
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unavailableOrEmptyTitles++;
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}
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}
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List<DashboardMetric> metrics = new ArrayList<>();
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metrics.add(new DashboardMetric("图书种类", totalTitles, "种", "来自馆藏检索"));
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metrics.add(new DashboardMetric("馆藏总册", totalCopies, "册", "来自馆藏检索"));
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metrics.add(new DashboardMetric("可借册数", availableCopies, "册", "来自馆藏检索"));
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metrics.add(new DashboardMetric("需关注馆藏", unavailableOrEmptyTitles, "种", "不可借或无库存"));
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return metrics;
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}
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private int valueOf(InventorySummary summary, MetricField field) {
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if (summary == null) {
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return 0;
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}
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switch (field) {
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case TOTAL_COPIES:
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return summary.getTotalCopies();
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case AVAILABLE_COPIES:
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return summary.getAvailableCopies();
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default:
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return 0;
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}
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}
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private int valueOf(BorrowingSummary summary, MetricField field) {
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if (summary == null) {
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return 0;
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}
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switch (field) {
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case ACTIVE_LOANS:
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return summary.getActiveLoans();
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case OVERDUE_LOANS:
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return summary.getOverdueLoans();
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default:
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return 0;
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}
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}
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private void setErrorMessage(HttpServletRequest request, String message) {
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if (message != null && !message.isEmpty() && request.getAttribute("errorMessage") == null) {
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request.setAttribute("errorMessage", message);
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}
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}
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private enum MetricField {
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TOTAL_COPIES,
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AVAILABLE_COPIES,
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ACTIVE_LOANS,
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OVERDUE_LOANS
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}
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public static final class DashboardMetric {
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private final String label;
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private final int value;
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private final String unit;
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private final String note;
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private DashboardMetric(String label, int value, String unit, String note) {
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this.label = label;
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this.value = value;
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this.unit = unit;
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this.note = note;
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}
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public String getLabel() {
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return label;
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}
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public int getValue() {
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return value;
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}
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public String getUnit() {
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return unit;
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}
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public String getNote() {
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return note;
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}
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}
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}
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