工具类

liuxun · liuxun · commit 4a54d715d484 · 2017-12-12T17:40:32.000+08:00
diff --git a/src/main/java/com/algorithm/study/demo/util/Paging.java b/src/main/java/com/algorithm/study/demo/util/Paging.java
@@ -0,0 +1,75 @@
+package com.algorithm.study.demo.util;
+
+import java.io.Serializable;
+
+/***
+ * 分页工具类
+ */
+public class Paging implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+	private static final int PAGE_SIZE = 10;
+
+	private int total = 0;
+
+	private int page = 1;
+
+	private int pageSize = PAGE_SIZE;
+
+	private int pages = 0;
+
+	public Paging() {
+		this(1, PAGE_SIZE);
+	}
+
+	public Paging(int page, int pageSize) {
+		this.page = page;
+		this.pageSize = pageSize;
+	}
+
+	private void calculatePages() {
+		total = total > 0 ? total : 0;
+		pageSize = pageSize > 0 ? pageSize : PAGE_SIZE;
+		pages = total / pageSize + (total % pageSize == 0 ? 0 : 1);
+		page = pages >= 1 ? Math.min(Math.max(page, 1), pages) : 1;
+	}
+
+	public int getTotal() {
+		return total;
+	}
+
+	public void setTotal(int total) {
+		this.total = total;
+		calculatePages();
+	}
+
+	public int getPage() {
+		return page;
+	}
+
+	public void setPage(int page) {
+		this.page = page;
+	}
+
+	public int getPageSize() {
+		return pageSize;
+	}
+
+	public void setPageSize(int pageSize) {
+		this.pageSize = pageSize;
+	}
+
+	public int getPages() {
+		return pages;
+	}
+
+	public void setPages(int pages) {
+		this.pages = pages;
+	}
+
+	public int getStart() {
+		return Math.max((page - 1) * pageSize, 0);
+	}
+
+}
