From 146c1bb2a966a99c726d11129acb64d5981a55ba Mon Sep 17 00:00:00 2001 From: mmchsusan Date: Sat, 26 May 2018 08:16:54 -0400 Subject: [PATCH] BAEL-1793 Spring with Thymeleaf Pagination for a List (#4290) * BAEL-1793 Spring with Thymeleaf Pagination for a List * Replace tabs with 4 spaces in HTML based on editor's feedback. --- .../thymeleaf/controller/BookController.java | 48 +++++++++++++++ .../com/baeldung/thymeleaf/model/Book.java | 29 +++++++++ .../com/baeldung/thymeleaf/model/Page.java | 61 +++++++++++++++++++ .../baeldung/thymeleaf/utils/BookUtils.java | 28 +++++++++ .../src/main/resources/messages_en.properties | 23 +++---- .../src/main/webapp/WEB-INF/views/home.html | 3 + .../main/webapp/WEB-INF/views/listBooks.html | 58 ++++++++++++++++++ 7 files changed, 239 insertions(+), 11 deletions(-) create mode 100644 spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/controller/BookController.java create mode 100644 spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Book.java create mode 100644 spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Page.java create mode 100644 spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/utils/BookUtils.java create mode 100644 spring-thymeleaf/src/main/webapp/WEB-INF/views/listBooks.html diff --git a/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/controller/BookController.java b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/controller/BookController.java new file mode 100644 index 0000000000..4c69a60b8e --- /dev/null +++ b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/controller/BookController.java @@ -0,0 +1,48 @@ +package com.baeldung.thymeleaf.controller; + +import java.util.List; +import java.util.Optional; +import java.util.stream.Collectors; +import java.util.stream.IntStream; + +import org.springframework.stereotype.Controller; +import org.springframework.ui.Model; +import org.springframework.web.bind.annotation.RequestMapping; +import org.springframework.web.bind.annotation.RequestMethod; +import org.springframework.web.bind.annotation.RequestParam; + +import com.baeldung.thymeleaf.model.Book; +import com.baeldung.thymeleaf.model.Page; +import com.baeldung.thymeleaf.utils.BookUtils; + +@Controller +public class BookController { + + private static int currentPage = 1; + private static int pageSize = 5; + + @RequestMapping(value = "/listBooks", method = RequestMethod.GET) + public String listBooks(Model model, @RequestParam("page") Optional page, @RequestParam("size") Optional size) { + page.ifPresent(p -> currentPage = p); + size.ifPresent(s -> pageSize = s); + + List books = BookUtils.buildBooks(); + Page bookPage = new Page(books, pageSize, currentPage); + + model.addAttribute("books", bookPage.getList()); + model.addAttribute("selectedPage", bookPage.getCurrentPage()); + model.addAttribute("pageSize", pageSize); + + int totalPages = bookPage.getTotalPages(); + model.addAttribute("totalPages", totalPages); + + if (totalPages > 1) { + List pageNumbers = IntStream.rangeClosed(1, totalPages) + .boxed() + .collect(Collectors.toList()); + model.addAttribute("pageNumbers", pageNumbers); + } + + return "listBooks.html"; + } +} diff --git a/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Book.java b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Book.java new file mode 100644 index 0000000000..0203231175 --- /dev/null +++ b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Book.java @@ -0,0 +1,29 @@ +package com.baeldung.thymeleaf.model; + +public class Book { + private int id; + private String name; + + public Book(int id, String name) { + super(); + this.id = id; + this.name = name; + } + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + +} diff --git a/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Page.java b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Page.java new file mode 100644 index 0000000000..e9dd0a8135 --- /dev/null +++ b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/model/Page.java @@ -0,0 +1,61 @@ +package com.baeldung.thymeleaf.model; + +import java.util.Collections; +import java.util.List; + +public class Page { + + private List list; + + private int pageSize = 0; + + private int currentPage = 0; + + private int totalPages = 0; + + public Page(List list, int pageSize, int currentPage) { + + if (list.isEmpty()) { + this.list = list; + } + + if (pageSize <= 0 || pageSize > list.size() || currentPage <= 0) { + throw new IllegalArgumentException("invalid page size or current page!"); + } + + this.pageSize = pageSize; + + this.currentPage = currentPage; + + if (list.size() % pageSize == 0) { + this.totalPages = list.size() / pageSize; + } else { + this.totalPages = list.size() / pageSize + 1; + } + + int startItem = (currentPage - 1) * pageSize; + if (list.size() < startItem) { + this.list = Collections.emptyList(); + } + + int toIndex = Math.min(startItem + pageSize, list.size()); + this.list = list.subList(startItem, toIndex); + } + + public List getList() { + return list; + } + + public int getPageSize() { + return pageSize; + } + + public int getCurrentPage() { + return currentPage; + } + + public int getTotalPages() { + return totalPages; + } + +} diff --git a/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/utils/BookUtils.java b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/utils/BookUtils.java new file mode 100644 index 0000000000..3cd9e6a92e --- /dev/null +++ b/spring-thymeleaf/src/main/java/com/baeldung/thymeleaf/utils/BookUtils.java @@ -0,0 +1,28 @@ +package com.baeldung.thymeleaf.utils; + +import java.util.ArrayList; +import java.util.List; +import java.util.stream.IntStream; + +import com.baeldung.thymeleaf.model.Book; + +public class BookUtils { + + private static List books = new ArrayList(); + + private static final int NUM_BOOKS = 30; + + private static final int MIN_BOOK_NUM = 1000; + + public static List buildBooks() { + if (books.isEmpty()) { + IntStream.range(0, NUM_BOOKS).forEach(n -> { + books.add(new Book(MIN_BOOK_NUM + n + 1, "Spring in Action")); + }); + + } + + return books; + } + +} diff --git a/spring-thymeleaf/src/main/resources/messages_en.properties b/spring-thymeleaf/src/main/resources/messages_en.properties index 373c20f1d1..b534d448b6 100644 --- a/spring-thymeleaf/src/main/resources/messages_en.properties +++ b/spring-thymeleaf/src/main/resources/messages_en.properties @@ -1,12 +1,13 @@ -msg.id=ID -msg.name=Name -msg.gender=Gender -msg.percent=Percentage -welcome.message=Welcome Student !!! -msg.AddStudent=Add Student -msg.ListStudents=List Students -msg.Home=Home -msg.ListTeachers=List Teachers -msg.courses=Courses -msg.skills=Skills +msg.id=ID +msg.name=Name +msg.gender=Gender +msg.percent=Percentage +welcome.message=Welcome Student !!! +msg.AddStudent=Add Student +msg.ListStudents=List Students +msg.Home=Home +msg.ListTeachers=List Teachers +msg.ListBooks=List Books with paging +msg.courses=Courses +msg.skills=Skills msg.active=Active \ No newline at end of file diff --git a/spring-thymeleaf/src/main/webapp/WEB-INF/views/home.html b/spring-thymeleaf/src/main/webapp/WEB-INF/views/home.html index 3d4f8b530f..b458f7270c 100644 --- a/spring-thymeleaf/src/main/webapp/WEB-INF/views/home.html +++ b/spring-thymeleaf/src/main/webapp/WEB-INF/views/home.html @@ -21,6 +21,9 @@ + + + diff --git a/spring-thymeleaf/src/main/webapp/WEB-INF/views/listBooks.html b/spring-thymeleaf/src/main/webapp/WEB-INF/views/listBooks.html new file mode 100644 index 0000000000..3f102c545c --- /dev/null +++ b/spring-thymeleaf/src/main/webapp/WEB-INF/views/listBooks.html @@ -0,0 +1,58 @@ + + + + +Book List + + +

Book List

+ + + + + + + + + +
+ +
+ +
+ + +
+

+ +

+
+ + + +