JAVA PageInfo实现分页数据获取与展示
2024-05-17 17:09:55
背景
Servlet中怎么实现大数据分页获取呢？
方案
引入pagehelper依赖
Servlet
HTML
PageInfo
package com.github.pagehelper;import java.util.Collection;
import java.util.List;public class PageInfo<T> extends PageSerializable<T> {private int pageNum;private int pageSize;private int size;private int startRow;private int endRow;private int pages;private int prePage;private int nextPage;private boolean isFirstPage;private boolean isLastPage;private boolean hasPreviousPage;private boolean hasNextPage;private int navigatePages;private int[] navigatepageNums;private int navigateFirstPage;private int navigateLastPage;public PageInfo() {this.isFirstPage = false;this.isLastPage = false;this.hasPreviousPage = false;this.hasNextPage = false;}public PageInfo(List<T> list) {this(list, 8);}public PageInfo(List<T> list, int navigatePages) {super(list);this.isFirstPage = false;this.isLastPage = false;this.hasPreviousPage = false;this.hasNextPage = false;if (list instanceof Page) {Page page = (Page)list;this.pageNum = page.getPageNum();this.pageSize = page.getPageSize();this.pages = page.getPages();this.size = page.size();if (this.size == 0) {this.startRow = 0;this.endRow = 0;} else {this.startRow = page.getStartRow() + 1;this.endRow = this.startRow - 1 + this.size;}} else if (list instanceof Collection) {this.pageNum = 1;this.pageSize = list.size();this.pages = this.pageSize > 0 ? 1 : 0;this.size = list.size();this.startRow = 0;this.endRow = list.size() > 0 ? list.size() - 1 : 0;}if (list instanceof Collection) {this.navigatePages = navigatePages;this.calcNavigatepageNums();this.calcPage();this.judgePageBoudary();}}public static <T> PageInfo<T> of(List<T> list) {return new PageInfo(list);}public static <T> PageInfo<T> of(List<T> list, int navigatePages) {return new PageInfo(list, navigatePages);}private void calcNavigatepageNums() {int i;if (this.pages <= this.navigatePages) {this.navigatepageNums = new int[this.pages];for(i = 0; i < this.pages; ++i) {this.navigatepageNums[i] = i + 1;}} else {this.navigatepageNums = new int[this.navigatePages];i = this.pageNum - this.navigatePages / 2;int endNum = this.pageNum + this.navigatePages / 2;int i;if (i < 1) {i = 1;for(i = 0; i < this.navigatePages; ++i) {this.navigatepageNums[i] = i++;}} else if (endNum > this.pages) {endNum = this.pages;for(i = this.navigatePages - 1; i >= 0; --i) {this.navigatepageNums[i] = endNum--;}} else {for(i = 0; i < this.navigatePages; ++i) {this.navigatepageNums[i] = i++;}}}}private void calcPage() {if (this.navigatepageNums != null && this.navigatepageNums.length > 0) {this.navigateFirstPage = this.navigatepageNums[0];this.navigateLastPage = this.navigatepageNums[this.navigatepageNums.length - 1];if (this.pageNum > 1) {this.prePage = this.pageNum - 1;}if (this.pageNum < this.pages) {this.nextPage = this.pageNum + 1;}}}private void judgePageBoudary() {this.isFirstPage = this.pageNum == 1;this.isLastPage = this.pageNum == this.pages || this.pages == 0;this.hasPreviousPage = this.pageNum > 1;this.hasNextPage = this.pageNum < this.pages;}public int getPageNum() {return this.pageNum;}public void setPageNum(int pageNum) {this.pageNum = pageNum;}public int getPageSize() {return this.pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public int getSize() {return this.size;}public void setSize(int size) {this.size = size;}public int getStartRow() {return this.startRow;}public void setStartRow(int startRow) {this.startRow = startRow;}public int getEndRow() {return this.endRow;}public void setEndRow(int endRow) {this.endRow = endRow;}public int getPages() {return this.pages;}public void setPages(int pages) {this.pages = pages;}public int getPrePage() {return this.prePage;}public void setPrePage(int prePage) {this.prePage = prePage;}public int getNextPage() {return this.nextPage;}public void setNextPage(int nextPage) {this.nextPage = nextPage;}public boolean isIsFirstPage() {return this.isFirstPage;}public void setIsFirstPage(boolean isFirstPage) {this.isFirstPage = isFirstPage;}public boolean isIsLastPage() {return this.isLastPage;}public void setIsLastPage(boolean isLastPage) {this.isLastPage = isLastPage;}public boolean isHasPreviousPage() {return this.hasPreviousPage;}public void setHasPreviousPage(boolean hasPreviousPage) {this.hasPreviousPage = hasPreviousPage;}public boolean isHasNextPage() {return this.hasNextPage;}public void setHasNextPage(boolean hasNextPage) {this.hasNextPage = hasNextPage;}public int getNavigatePages() {return this.navigatePages;}public void setNavigatePages(int navigatePages) {this.navigatePages = navigatePages;}public int[] getNavigatepageNums() {return this.navigatepageNums;}public void setNavigatepageNums(int[] navigatepageNums) {this.navigatepageNums = navigatepageNums;}public int getNavigateFirstPage() {return this.navigateFirstPage;}public int getNavigateLastPage() {return this.navigateLastPage;}public void setNavigateFirstPage(int navigateFirstPage) {this.navigateFirstPage = navigateFirstPage;}public void setNavigateLastPage(int navigateLastPage) {this.navigateLastPage = navigateLastPage;}public String toString() {StringBuilder sb = new StringBuilder("PageInfo{");sb.append("pageNum=").append(this.pageNum);sb.append(", pageSize=").append(this.pageSize);sb.append(", size=").append(this.size);sb.append(", startRow=").append(this.startRow);sb.append(", endRow=").append(this.endRow);sb.append(", total=").append(this.total);sb.append(", pages=").append(this.pages);sb.append(", list=").append(this.list);sb.append(", prePage=").append(this.prePage);sb.append(", nextPage=").append(this.nextPage);sb.append(", isFirstPage=").append(this.isFirstPage);sb.append(", isLastPage=").append(this.isLastPage);sb.append(", hasPreviousPage=").append(this.hasPreviousPage);sb.append(", hasNextPage=").append(this.hasNextPage);sb.append(", navigatePages=").append(this.navigatePages);sb.append(", navigateFirstPage=").append(this.navigateFirstPage);sb.append(", navigateLastPage=").append(this.navigateLastPage);sb.append(", navigatepageNums=");if (this.navigatepageNums == null) {sb.append("null");} else {sb.append('[');for(int i = 0; i < this.navigatepageNums.length; ++i) {sb.append(i == 0 ? "" : ", ").append(this.navigatepageNums[i]);}sb.append(']');}sb.append('}');return sb.toString();}
}
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