JAVA分页工具类
最近写了一个代码生成工具，分享下该工具下的分页工具
一、分页工具类
package com.qy.code.api.page; import java.io.Serializable; import java.util.List; /** * @author shizhenwei * * @param <T>用于向前台返还List所用 */ public class PageInfo<T> implements Serializable { private static final long serialVersionUID = 1L; /** * 当前页码数 */ private int pageNum; /** * 每页显示的记录数 */ private int pageSize; /** * 开始行号 */ private long startRow; /** * 结束行号 */ private long endRow; /** * 总记录数 */ private long rows; /** * 总页码数 */ private int pages; /** * 导航条 页码数 */ private int navigatePages; /** * 导航条 具体页码数 */ private int[] navigatePageNums; /** * 导航条上的开始页 */ private int navigateStartPage; /** * 导航条上的结束页 */ private int navigateEndPage; /** * 首页页码 */ private int firstPage; /** * 上一页页码 */ private int previousPage; /** * 下一页页码 */ private int nextPage; /** * 尾页页码 */ private int lastPage; /** * 是否有上一页 */ private boolean hasPreviousPage = false; /** * 是否有下一页 */ private boolean hasNextPage = false; /** * 是否为首页 */ private boolean isFirstPage = false; /** * 是否为最后一页 */ private boolean isLastPage = false; // 存放本次分页查询出来的数据 private List<T> list; /** * @param pageNum * @param pageSize * @param rows * @param navigatePages */ public PageInfo(List<T> list) { if (list instanceof PageList) { PageList<T> pageList = (PageList<T>)list; // 当前页码 this.pageNum = pageList.getPageNum(); // 每页显示的记录数 this.pageSize = pageList.getPageSize(); // 总记录数 this.rows = pageList.getRows(); // 导航条 页码数 this.navigatePages = pageList.getNavigatePages(); // 总页码数 this.pages = (int) Math.ceil(this.rows * 1.0 / this.pageSize); // 当前页码大于总页码数时，当前页码=总页码数 if (this.pageNum > this.pages) { this.pageNum = this.pages; } // 开始行号 this.startRow = (this.pageNum * this.pageSize)-(this.pageSize-1); // 结束行号 this.endRow = this.pageNum * this.pageSize; //当结束行号>总行数时，结束行号=总行数 if(this.endRow > rows) { this.endRow = rows; } // 导航条 开始页码和结束页码 this.navigateStartPage = (this.pageNum - this.navigatePages / 2) > 0 ? (this.pageNum - this.navigatePages / 2) : 1; this.navigateEndPage = this.navigateStartPage+this.navigatePages; if(this.navigateEndPage>this.pages){ this.navigateEndPage = this.pages; if(this.navigateEndPage>this.navigatePages){ this.navigateStartPage = this.navigateEndPage-this.navigatePages+1; } } //导航条具体页数 this.navigatePageNums = new int[this.navigatePages]; for(int i=this.navigateStartPage; i<=this.navigateEndPage; i++){ this.navigatePageNums[i-this.navigateStartPage] = i; } //设置首页 this.firstPage = 1; //设置尾页 this.lastPage = this.pages; //是否为第一页 this.isFirstPage = this.pageNum==this.firstPage; //是否为最后一页 this.isLastPage = this.pageNum==this.lastPage; // 设置上一页 if (this.pageNum > 1) { this.hasPreviousPage = true; this.previousPage = this.pageNum - 1; } // 设置下一页 if (this.pageNum < this.pages) { this.hasNextPage = true; this.nextPage = this.pageNum + 1; } } } public int getPageNum() { return pageNum; } public void setPageNum(int pageNum) { this.pageNum = pageNum; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public long getStartRow() { return startRow; } public void setStartRow(long startRow) { this.startRow = startRow; } public long getEndRow() { return endRow; } public void setEndRow(long endRow) { this.endRow = endRow; } public long getRows() { return rows; } public void setRows(long rows) { this.rows = rows; } public int getPages() { return pages; } public void setPages(int pages) { this.pages = pages; } public int getNavigatePages() { return navigatePages; } public void setNavigatePages(int navigatePages) { this.navigatePages = navigatePages; } public int[] getNavigatePageNums() { return navigatePageNums; } public void setNavigatePageNums(int[] navigatePageNums) { this.navigatePageNums = navigatePageNums; } public int getNavigateStartPage() { return navigateStartPage; } public void setNavigateStartPage(int navigateStartPage) { this.navigateStartPage = navigateStartPage; } public int getNavigateEndPage() { return navigateEndPage; } public void setNavigateEndPage(int navigateEndPage) { this.navigateEndPage = navigateEndPage; } public int getFirstPage() { return firstPage; } public void setFirstPage(int firstPage) { this.firstPage = firstPage; } public int getPreviousPage() { return previousPage; } public void setPreviousPage(int previousPage) { this.previousPage = previousPage; } public int getNextPage() { return nextPage; } public void setNextPage(int nextPage) { this.nextPage = nextPage; } public int getLastPage() { return lastPage; } public void setLastPage(int lastPage) { this.lastPage = lastPage; } public boolean isHasPreviousPage() { return hasPreviousPage; } public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; } public boolean isHasNextPage() { return hasNextPage; } public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; } public boolean isFirstPage() { return isFirstPage; } public void setFirstPage(boolean isFirstPage) { this.isFirstPage = isFirstPage; } public boolean isLastPage() { return isLastPage; } public void setLastPage(boolean isLastPage) { this.isLastPage = isLastPage; } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list; } public static long getSerialversionuid() { return serialVersionUID; } }
二、分页集合LIST
package com.qy.code.api.page; import java.util.ArrayList; /** * 描述：分页结果集 * @author 七脉 */ public class PageList<E> extends ArrayList<E> { private static final long serialVersionUID = 8172768353827243795L; /** * 页码 */ private int pageNum; /** * 每页记录数 */ private int pageSize; /** * 总共记录数 */ private int rows; /** * 分页下标 */ private int limitIndex; /** * 导航条固定显示多少页 */ private int navigatePages; public PageList(int pageNum, int pageSize, int rows) { super(); this.pageNum = pageNum; this.pageSize = pageSize; this.rows = rows; } public PageList(int pageNum, int pageSize, int rows, int navigatePages) { super(); this.pageNum = pageNum; this.pageSize = pageSize; this.rows = rows; this.limitIndex = (this.pageNum * this.pageSize)-(this.pageSize-1); this.navigatePages = navigatePages; } public int getPageNum() { return pageNum; } public void setPageNum(int pageNum) { this.pageNum = pageNum; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getRows() { return rows; } public void setRows(int rows) { this.rows = rows; } public int getNavigatePages() { return navigatePages; } public void setNavigatePages(int navigatePages) { this.navigatePages = navigatePages; } public int getLimitIndex() { return limitIndex; } public void setLimitIndex(int limitIndex) { this.limitIndex = limitIndex; } }
三、ModelAndResult对象
可以设置为@ResponseBody全局响应对象
也可以配合前台自带分页工具JS使用
package com.qy.code.api.result; import java.util.HashMap; /** * * <br>类 名: ModelAndResult * <br>描 述: 用户controller @responsebody * <br>作 者: shizhenwei * <br>创 建: 2017年9月6日 * <br>版 本: v1.0.0 * <br> * <br>历 史: (版本) 作者 时间 注释 */ public class ModelAndResult extends HashMap<String, Object> { /** * */ private static final long serialVersionUID = 8884722775905868487L; /** 操作是否成功 */ public final static String SUCCESS = "success"; /** 返回数据 */ public final static String DATA = "data"; /** 返回消息 */ public final static String MESSAGE = "message"; /** 返回code */ public final static String CODE = "code"; /** 总记录（用于分页查询） **/ public final static String TOTAL = "total"; /** 返回其他信息 */ public final static String OTHERS = "others"; public ModelAndResult() { setSuccess(true); } public <T> ModelAndResult(T data) { setSuccess(true); setData(data); } public ModelAndResult(boolean success,String message) { setSuccess(success); setMessage(message); } public <T> ModelAndResult(boolean success,String message, T data) { setSuccess(success); setMessage(message); setData(data); } public <T> void setAttribute(String key, T value){ put(key, value); } @SuppressWarnings("unchecked") public <T> T getAttribute(String key){ return (T) get(key); } public boolean isSuccess() { return getAttribute(SUCCESS); } public void setSuccess(boolean success) { setAttribute(SUCCESS, success); } public <T> T getData() { return getAttribute(DATA); } public <T> void setData(T data) { setAttribute(DATA, data); } public String getMessage() { return getAttribute(MESSAGE); } public void setMessage(String message) { setAttribute(MESSAGE, message); } public Long getTotal() { return getAttribute(TOTAL); } public void setTotal(Long total) { setAttribute(TOTAL, total); } public Object getOthers() { return getAttribute(OTHERS); } public void setOthers(Object others) { setAttribute(OTHERS, others); } public static String getCode() { return CODE; } public void setCode(Object code) { setAttribute(CODE, code); } }
