tags: 代码库

前言

为了复用，记载一些以前写过的工具类、方法

page类

	
	import java.util.List;
	
	/**
	 * Created by ozc on 2017/3/1.
	 */
	public class Page {
	
	    //保存着分页的数据
	    private List<Customer> list;
	
	    //总记录数
	    private long totalRecord;
	
	    //每页显示记录数，这里我规定每页显示3条
	    private int linesize = 3;
	
	    //总页数
	    private int totalPageCount;
	
	    //当前显示的页数
	    private int currentPageCount;
	
	    //开始取的记录位置
	    private int startIndex;
	
	    //记录JSP页面开始的页数和结束的页数
	    private int startPage;
	    private int endPage;
	
	    private String url;
	
	
	    public Page() {
	    }
	
	    public Page(int currentPageCount, long totalRecord) {
	
	
	        //将传递进来的currentPageCount初始化
	        this.currentPageCount = currentPageCount;
	
	        //总页数
	        totalPageCount = (int) (totalRecord % linesize == 0 ? totalRecord / linesize : totalRecord / linesize + 1);
	
	        this.totalRecord = totalRecord;
	
	        //开始取数据的位置
	        startIndex = (currentPageCount - 1) * linesize;
	
	
	        //如果当前页小于10，那么开始页为1，结束页为10就行了
	        if (this.currentPageCount <= 10) {
	            this.startPage = 1;
	            this.endPage = 10;
	        } else {
	            this.startPage = this.currentPageCount - 4;
	            this.endPage = this.currentPageCount + 5;
	
	            //加减后页数越界的情况
	            if (startPage < 1) {
	                this.startPage = 1;
	                this.endPage = 10;
	            }
	            if (endPage > totalPageCount) {
	                this.startPage = this.currentPageCount - 9;
	                this.endPage = this.totalPageCount;
	            }
	        }
	
	    }
	    public String getUrl() {
	        return url;
	    }
	
	    public void setUrl(String url) {
	        this.url = url;
	    }
	    public int getStartIndex() {
	        return startIndex;
	    }
	    public void setCurrentPageCount(int currentPageCount) {
	        this.currentPageCount = currentPageCount;
	    }
	    public void setStartIndex(int startIndex) {
	        this.startIndex = startIndex;
	    }
	
	    public int getStartPage() {
	        return startPage;
	    }
	
	    public void setStartPage(int startPage) {
	        this.startPage = startPage;
	    }
	
	    public int getEndPage() {
	        return endPage;
	    }
	
	    public void setEndPage(int endPage) {
	        this.endPage = endPage;
	    }
	
	    public int getTotalPageCount() {
	        return totalPageCount;
	    }
	
	    public void setTotalPageCount(int totalPageCount) {
	        this.totalPageCount = totalPageCount;
	    }
	
	    public List<Customer> getList() {
	        return list;
	    }
	
	    public void setList(List<Customer> list) {
	        this.list = list;
	    }
	
	    public long getTotalRecord() {
	        return totalRecord;
	    }
	
	    public void setTotalRecord(long totalRecord) {
	        this.totalRecord = totalRecord;
	    }
	
	    public int getLinesize() {
	        return linesize;
	    }
	
	    public void setLinesize(int linesize) {
	        this.linesize = linesize;
	    }
	
	
	    public long getCurrentPageCount() {
	        return currentPageCount;
	    }
	
	    public void setCurrentPageCount(long currentPageCount) {
	        this.currentPageCount = (int) currentPageCount;
	    }
	}

显示页面JSP

<%--
  Created by IntelliJ IDEA.
  User: ozc
  Date: 2017/3/1
  Time: 21:17
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--显示当前页数--%>
当前页数是：[${page.currentPageCount}]&nbsp;&nbsp;&nbsp;

<%--如果当前的页码大于1，才显示上一步--%>
<c:if test="${page.currentPageCount>1}">

    <%--把传递过去的页码-1就行了--%>
    <a href="${page.url}?currentPageCount=${page.currentPageCount-1}">
        上一步
    </a>
</c:if>


<%--提供页数的界面--%>
<c:forEach var="pageNum" begin="${page.startPage}" end="${page.endPage}">
    <a href="${page.url}?currentPageCount=${pageNum}">
        [${pageNum}]&nbsp;
    </a>
</c:forEach>

<%--如果当前的页码小于总页数，才显示下一步--%>
<c:if test="${page.currentPageCount<page.totalPageCount}">

    <%--把传递过去的页码-1就行了--%>
    <a href="${page.url}?currentPageCount=${page.currentPageCount+1}">
        下一步
    </a>&nbsp;&nbsp;
</c:if>

<input type="text" id="currentPageCount">
<input type="button" value="跳转" onclick="goPage()">

总页数是：${page.totalPageCount}&nbsp;&nbsp;

总记录数是：${page.totalRecord}


<script type="text/javascript">

    /*既然写上了JavaScript代码了，就顺便验证输入框输入的数据是否合法吧*/
    function goPage() {

        /*获取输入框控件*/
        var input = document.getElementById("currentPageCount");

        /*获取输入框的数据*/
        var value = input.value;

        if(value==null || value==""){
            alert("请输入页码");
            return false;
        }

        if(!value.match("\\d+")){
            alert("请输入数字");
            return false;
        }

        if(value<1 || value>${page.totalPageCount}){
            alert("请输入合法数据");
            return false ;
        }

        window.location.href="${page.url}?currentPageCount="+value;
    }

</script>

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