Java的分頁處理

1. 前端模塊

    <div class='pagelist'>
                <b>第<span>${pu.curPage}/${pu.totalPages }</span>頁 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a
                    href="selectLogs?curPage=${pu.firstPage}&size=${pu.size}"
                    class='first'>首頁</a> |
                <c:if test="${pu.hasPrepage}">
                    <a href="selectLogs?curPage=${pu.prePage}&size=${pu.size}"
                        class="right-font08">上一頁</a> |
                                             </c:if>
                <c:if test="${pu.hasNextpage}">
                    <a href="selectLogs?curPage=${pu.nextPage}&size=${pu.size}"
                        class="right-font08">下一頁</a> | 
                                            </c:if>
                <a href="selectLogs?curPage=${pu.lastPage}&size=${pu.size}"
                    class='last'>末頁</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    共&nbsp;&nbsp;${pu.totalCount}</b>&nbsp;&nbsp;條
            </div>

2 后台代碼

    /**
     * 查詢日志
     */
    @RequestMapping("selectLogs")
    public String selectLogs(HttpServletRequest req,HttpServletResponse resp) {
        String curPage = req.getParameter("curPage");
        String size = req.getParameter("size");
        int totalCount = logService.findAll();  9         PageUtil<User> pu = new PageUtil<>(curPage, size, totalCount); 10         List<Log> selectAll = logService.selectAll(pu.getStart(),pu.getSize());
        req.setAttribute("log", selectAll);
        req.setAttribute("pu", pu);
        
        return "logList";

3. pageUtil

package com.demo.common;

import java.util.List;

//分頁工具
public class PageUtil<T> {
    private int curPage;//當前頁的頁碼
    private int size;//每頁條目
    private int totalCount; //總條目數
    private int totalPages;//總頁數
    private int start;//起始頁條目數
    private boolean hasPrepage;//當前頁是否有上一頁
    private boolean hasNextpage;//當前頁是否有下一頁
    private int prePage;//上一頁
    private int nextPage;//下一頁
    private int firstPage;//首頁
    private int lastPage;//尾頁
    
    List<T> list;
    public List<T> getList() {
        return list;
    }
    public void setList(List<T> list) {
        this.list = list;
    }
    /**
     * 
     * @param curPage 使用String
     * @param size
     * @param totalCount
     */
    public PageUtil(String curPage, String size, int totalCount) {
        //當前頁為空
        this.curPage = curPage==null?1:Integer.parseInt(curPage);
        this.size = size==null?10:Integer.parseInt(size);
        this.totalCount = totalCount;
        this.totalPages=(int)(Math.ceil(this.totalCount*1.0/this.size));
        if(this.curPage<1){
            this.curPage=1;
        }
        if(this.curPage>this.totalPages){
            this.curPage=this.totalPages;
        }
        //如果當前頁>1,當前頁有上一頁
        if(this.curPage>1){
            this.hasPrepage=true;
            this.prePage=this.curPage-1;
            
        }
        //如果當前頁小於總頁數
        if(this.curPage<this.totalPages){
            this.hasNextpage=true;
            this.nextPage=this.curPage+1;
        }
        //
        this.start=(this.curPage-1)*this.size;
        this.firstPage=1;
        this.lastPage=this.totalPages;
    }
    public int getCurPage() {
        return curPage;
    }
    public void setCurPage(int curPage) {
        this.curPage = curPage;
    }
    public int getSize() {
        return size;
    }
    public void setSize(int size) {
        this.size = size;
    }
    public int getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }
    public int getTotalPages() {
        return totalPages;
    }
    public void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
    }
    public int getStart() {
        return start;
    }
    public void setStart(int start) {
        this.start = start;
    }
    public boolean isHasPrepage() {
        return hasPrepage;
    }
    public void setHasPrepage(boolean hasPrepage) {
        this.hasPrepage = hasPrepage;
    }
    public boolean isHasNextpage() {
        return hasNextpage;
    }
    public void setHasNextpage(boolean hasNextpage) {
        this.hasNextpage = hasNextpage;
    }
    public int getPrePage() {
        return prePage;
    }
    public void setPrePage(int prePage) {
        this.prePage = prePage;
    }
    public int getNextPage() {
        return nextPage;
    }
    public void setNextPage(int nextPage) {
        this.nextPage = nextPage;
    }
    public int getFirstPage() {
        return firstPage;
    }
    public void setFirstPage(int firstPage) {
        this.firstPage = firstPage;
    }
    public int getLastPage() {
        return lastPage;
    }
    public void setLastPage(int lastPage) {
        this.lastPage = lastPage;
    }
    @Override
    public String toString() {
        return "PageUtil [curPage=" + curPage + ", size=" + size + ", totalCount=" + totalCount + "]";
    }
    
    
}