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core/src/main/java/com/zrqx/core/util/page/PageMap.java

+package com.zrqx.core.util.page;
+
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import com.github.pagehelper.Page;
+
+import lombok.Data;
+@ApiModel(value="PageMap",description="分页分组工具类")
+@Data
+public class PageMap<K,V> implements Serializable {
+    private static final long serialVersionUID = 1L;
+    @ApiModelProperty("当前页")
+    private int pageNum;
+    @ApiModelProperty("每页的数量")
+    private int pageSize;
+    @ApiModelProperty("当前页的数量")
+    private int size;
+    @ApiModelProperty("当前页面第一个元素在数据库中的行号")
+    private int startRow;
+    @ApiModelProperty("当前页面最后一个元素在数据库中的行号")
+    private int endRow;
+    @ApiModelProperty("总记录数")
+    private long total;
+    @ApiModelProperty("总页数")
+    private int pages;
+    @ApiModelProperty("结果集")
+    private Map<K,V> map;
+    @ApiModelProperty("前一页")
+    private int prePage;
+    @ApiModelProperty("下一页")
+    private int nextPage;
+    @ApiModelProperty("是否为第一页")
+    private boolean isFirstPage = false;
+    @ApiModelProperty("是否为最后一页")
+    private boolean isLastPage = false;
+    @ApiModelProperty("是否有前一页")
+    private boolean hasPreviousPage = false;
+    @ApiModelProperty("是否有下一页")
+    private boolean hasNextPage = false;
+    @ApiModelProperty("导航页码数")
+    private int navigatePages;
+    @ApiModelProperty("所有导航页号")
+    private int[] navigatepageNums;
+    @ApiModelProperty("导航条上的第一页")
+    private int navigateFirstPage;
+    @ApiModelProperty("导航条上的最后一页")
+    private int navigateLastPage;
+
+  
+    public PageMap(){
+    	
+    }
+
+    
+    public PageMap(List<?> list,Map<K,V> result) {
+    	this(list, 8);
+    	this.map = result;
+    }
+    
+
+
+    /**
+     * 包装Page对象
+     *
+     * @param list          page结果
+     * @param navigatePages 页码数量
+     */
+    public PageMap(List<?> list, int navigatePages) {
+        if (list instanceof Page) {
+            Page page = (Page) list;
+            this.pageNum = page.getPageNum();
+            this.pageSize = page.getPageSize();
+
+            this.pages = page.getPages();
+            this.size = page.size();
+            this.total = page.getTotal();
+            //由于结果是>startRow的，所以实际的需要+1
+            if (this.size == 0) {
+                this.startRow = 0;
+                this.endRow = 0;
+            } else {
+                this.startRow = page.getStartRow() + 1;
+                //计算实际的endRow（最后一页的时候特殊）
+                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.total = list.size();
+            this.startRow = 0;
+            this.endRow = list.size() > 0 ? list.size() - 1 : 0;
+        }
+        if (list instanceof Collection) {
+            this.navigatePages = navigatePages;
+            //计算导航页
+            calcNavigatepageNums();
+            //计算前后页，第一页，最后一页
+            calcPage();
+            //判断页面边界
+            judgePageBoudary();
+        }
+    }
+
+    /**
+     * 计算导航页
+     */
+    private void calcNavigatepageNums() {
+        //当总页数小于或等于导航页码数时
+        if (pages <= navigatePages) {
+            navigatepageNums = new int[pages];
+            for (int i = 0; i < pages; i++) {
+                navigatepageNums[i] = i + 1;
+            }
+        } else { //当总页数大于导航页码数时
+            navigatepageNums = new int[navigatePages];
+            int startNum = pageNum - navigatePages / 2;
+            int endNum = pageNum + navigatePages / 2;
+
+            if (startNum < 1) {
+                startNum = 1;
+                //(最前navigatePages页
+                for (int i = 0; i < navigatePages; i++) {
+                    navigatepageNums[i] = startNum++;
+                }
+            } else if (endNum > pages) {
+                endNum = pages;
+                //最后navigatePages页
+                for (int i = navigatePages - 1; i >= 0; i--) {
+                    navigatepageNums[i] = endNum--;
+                }
+            } else {
+                //所有中间页
+                for (int i = 0; i < navigatePages; i++) {
+                    navigatepageNums[i] = startNum++;
+                }
+            }
+        }
+    }
+
+    /**
+     * 计算前后页，第一页，最后一页
+     */
+    private void calcPage() {
+        if (navigatepageNums != null && navigatepageNums.length > 0) {
+            navigateFirstPage = navigatepageNums[0];
+            navigateLastPage = navigatepageNums[navigatepageNums.length - 1];
+            if (pageNum > 1) {
+                prePage = pageNum - 1;
+            }
+            if (pageNum < pages) {
+                nextPage = pageNum + 1;
+            }
+        }
+    }
+
+    /**
+     * 判定页面边界
+     */
+    private void judgePageBoudary() {
+        isFirstPage = pageNum == 1;
+        isLastPage = pageNum == pages || pages == 0;;
+        hasPreviousPage = pageNum > 1;
+        hasNextPage = pageNum < pages;
+    }
+
+}
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