最終效果：

實現(xiàn)：

分頁查詢有幾個比較重要的參數(shù)，pageNum當(dāng)前的頁數(shù)，pageSize每頁所展示的數(shù)據(jù)，totalRecord總共有多少數(shù)據(jù)，其他的數(shù)據(jù)可以根據(jù)這三個數(shù)據(jù)得出，有了這幾個數(shù)據(jù)就可以分頁查詢了

public class Page {
    //當(dāng)前的頁數(shù)
    private int pageNum;
    //每頁所展示的數(shù)據(jù)
    private int pageSize;
    //總共有多少數(shù)據(jù)
    private int totalRecord;
    //總頁數(shù)
    private int totalPage;
    //查詢數(shù)據(jù)的起始位置
    private int startIndex;
    //存放查詢到的數(shù)據(jù)
    private List<Book> booklist;
    //相對的頭頁
    private int start;
    //相對的尾頁
    private int end; 
    public Page(int pageNum, int pageSize, int totalRecord) {
        this.pageNum = pageNum;
        this.pageSize = pageSize;
        this.totalRecord = totalRecord; 
        if(totalRecord%pageSize == 0){
            //如果剛好能夠整除，則totalPage = totalRecord/pageSize
            this.totalPage = totalRecord/pageSize;
        }else{
            //如歌不能整除，則需要多加一頁顯示余下的數(shù)據(jù)
            this.totalPage = (totalRecord/pageSize)+1;
        }
        this.startIndex = (pageNum-1)*pageSize;
        //初始頭頁
        this.start = 1;
        //初始尾頁
        this.end = 5;
        if(totalPage<5){
            //如果總頁數(shù)小于5頁，則尾頁為總頁數(shù)
            this.end = this.totalPage;
        }else{
            this.start = this.pageNum-2;
            this.end = this.pageNum+2;
            if(this.start<0){
                this.start = 1;
                this.end = 5;
            }
            if(this.end>totalPage){
                this.end = totalPage;
                this.start = this.end-5;
            }
        }
    } 
    //下面的為get/set方法
    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 getTotalRecord() {
        return totalRecord;
    } 
    public void setTotalRecord(int totalRecord) {
        this.totalRecord = totalRecord;
    } 
    public int getTotalPage() {
        return totalPage;
    } 
    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    } 
    public int getStartIndex() {
        return startIndex;
    }
    public void setStartIndex(int startIndex) {
        this.startIndex = startIndex;
    } 
    public List<Book> getBooklist() {
        return booklist;
    } 
    public void setBooklist(List<Book> booklist) {
        this.booklist = booklist;
    } 
    public int getStart() {
        return start;
    } 
    public void setStart(int start) {
        this.start = start;
    } 
    public int getEnd() {
        return end;
    } 
    public void setEnd(int end) {
        this.end = end;
    }
}

pageNum從請求中獲得，pageSize自己設(shè)置，totalRecord通過mybatis查詢獲得，一開始登錄的時候請求中沒有pageNum，所以進行一個判斷，如果沒有pageNum則賦值為1

 //pageNum 
 String pageNum = request.getParameter("pageNum") == null?"1":request.getParameter("pageNum");
//pageSize 
   int pageSize = 7;
//totalRecord
int totalRecord = bookMapper.BookSize();
//mybatis
<select id="BookSize" resultType="int">
        select count(*) from book
 </select>

有了pageNum和startIndex就可以查詢到特定范圍的數(shù)據(jù)，通過使用mysql中的limit函數(shù)，limit有兩個參數(shù)，第一個參數(shù)為起始位置，即從那開始查，第二個參數(shù)為查詢范圍，即查多少個，如 limit 14,7 為從第14個數(shù)據(jù)開始往后查七個。

<select id="Books" parameterType="java.util.Map" resultType="book">
        select *from book  limit #{startIndex},#{pageSize}
    </select>

public static Page getPageUser(int pageNum,int pageSize){
        SqlSession sqlSession = GetSqlSession.getSqlSession();
        BookMapper bookMapper = sqlSession.getMapper(BookMapper.class);
        int totalRecord = bookMapper.BookSize(); 
        Page page = new Page(pageNum,pageSize ,totalRecord );
        int startIndex = page.getStartIndex();
        Map<String,Integer> map = new HashMap<>();
        map.put("startIndex",startIndex );
        map.put("pageSize",pageSize );
        page.setBooklist(bookMapper.Books(map));
        return page;
    }

jsp頁面：

<a href="index?pageNum=1">首頁</a>
            <%--當(dāng)前頁數(shù)為第一頁--%>
        <c:if test="${sessionScope.page.pageNum == 1}">
            <c:forEach begin="${sessionScope.page.start}" end="${sessionScope.page.end}" step="1" var="i">
                <c:if test="${sessionScope.page.pageNum == i}">
                    <span  style="color: deeppink">${i}</span>
                </c:if>
                <c:if test="${sessionScope.page.pageNum != i}">
                    <a href="index?pageNum=${i}">${i}</a>
                </c:if>
            </c:forEach>
            <a href="index?pageNum=${sessionScope.page.pageNum+1}">下一頁</a>
        </c:if>
        <%--當(dāng)前頁數(shù)為中間頁數(shù)--%>
        <c:if test="${sessionScope.page.pageNum >1 && sessionScope.page.pageNum<sessionScope.page.totalPage}">
            <a href="index?pageNum=${sessionScope.page.pageNum-1}">上一頁</a>
            <c:forEach begin="${sessionScope.page.start}" end="${sessionScope.page.end}" step="1" var="i">
                <c:if test="${sessionScope.page.pageNum == i}">
                    <span  style="color: deeppink">${i}</span>
                </c:if>
                <c:if test="${sessionScope.page.pageNum != i}">
                    <a href="index?pageNum=${i}">${i}</a>
                </c:if>
            </c:forEach>
            <a href="index?pageNum=${sessionScope.page.pageNum+1}">下一頁</a>
        </c:if>
        <%--當(dāng)前頁數(shù)為最后一頁--%>
        <c:if test="${sessionScope.page.pageNum == sessionScope.page.totalPage}">
            <a href="index?pageNum=${sessionScope.page.pageNum-1}">上一頁</a>
            <c:forEach begin="${sessionScope.page.start}" end="${sessionScope.page.end}" step="1" var="i">
                <c:if test="${sessionScope.page.pageNum == i}">
                    <span  style="color: deeppink">${i}</span>
                </c:if>
                <c:if test="${sessionScope.page.pageNum != i}">
                    <a href="index?pageNum=${i}">${i}</a>
                </c:if>
            </c:forEach>
        </c:if>
        <a href="index?pageNum=${sessionScope.page.totalPage}">尾頁</a>

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