java实现分页显示效果

时间：2021-05-19

本文实例为大家分享了java实现页显示效果的具体代码，供大家参考，具体内容如下

效果图如下：

实现步骤：

1.创建实体User.class,参考代码如下：

public class User { private String name; private int age; private String gender; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public User(String name, int age, String gender) { super(); this.name = name; this.age = age; this.gender = gender; } public User() { } }

2.创建分页模型PageBean.class,参考代码如下：

public class PageBean<T> { private int pageNum; private int pageSize; private int totalRecord; private int totalPage; private List<T> list; private int start; private int end; private int fromIndex; private int toIndex; public PageBean(int pageNum, int pageSize, int totalRecord) { this.pageNum = pageNum; this.pageSize = pageSize; this.totalRecord = totalRecord; fromIndex=(pageNum-1)*pageSize; toIndex=pageNum*pageSize>totalRecord?totalRecord:pageNum*pageSize; if (totalRecord % pageSize == 0) { this.totalPage = totalRecord / pageSize; } else { this.totalPage = totalRecord / pageSize + 1; } start = 1; end = 5; if (totalPage <= 5) { end = this.totalPage; } else { start = pageNum - 2; end = pageNum + 2; if (start < 1) { start = 1; end = 5; } if (end > this.totalPage) { end = totalPage; start = end - 5; } } } 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 int getFromIndex() { return fromIndex; } public void setFromIndex(int fromIndex) { this.fromIndex = fromIndex; } public int getToIndex() { return toIndex; } public void setToIndex(int toIndex) { this.toIndex = toIndex; } public void setTotalRecord(int totalRecord) { this.totalRecord = totalRecord; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public List<T> getList() { return list; } public void setList(List<T> list) { this.list = list.subList(fromIndex, toIndex); } 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; } }

3.创建jsp页面，参考代码如下：

/** *index.jsp */<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http:///jsp/jstl/core"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="${pageContext.request.contextPath}/jquery/jquery.min.js"></script> <script type="text/javascript"> function gos() { var pageNum = $.trim($("#pageNum").val()); if(isNaN(pageNum)){ alert("输入的不是数字 ，请输入数字！"); return ; } if(pageNum==""){ alert("输入为空，请重新输入！"); return ; } if(pageNum<1||pageNum>${requestScope.pageBean.totalPage}){ alert("超出范围，请重新输入！"); return ; } location.href="${pageContext.request.contextPath}/main?pageNum=" rel="external nofollow" +pageNum; } </script> <title>分页显示</title> </head> <body> <center> <table width="40%" style="text-align:center"> <tr> <th>姓名</th> <th>性别</th> <th>年龄</th> </tr> <c:forEach items="${requestScope.pageBean.list }" var="i"> <tr> <td>${i.name }</td> <td>${i.gender }</td> <td>${i.age }</td> </tr> </c:forEach> </table> </center> <br /> <center> <a href="${pageContext.request.contextPath}/main?pageNum=1" rel="external nofollow" >首页</a> <c:if test="${requestScope.pageBean.pageNum ==1}"> <c:forEach begin="${requestScope.pageBean.start}" end="${requestScope.pageBean.end}" var="i"> <c:if test="${requestScope.pageBean.pageNum == i}"> ${i} </c:if> <c:if test="${requestScope.pageBean.pageNum != i}"> <a href="${pageContext.request.contextPath}/main?pageNum=${i}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${i}</a> </c:if> </c:forEach> <a href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum+1}" rel="external nofollow" rel="external nofollow" >下一页</a> </c:if> <c:if test="${requestScope.pageBean.pageNum > 1 && requestScope.pageBean.pageNum < requestScope.pageBean.totalPage}"> <a href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum-1}" rel="external nofollow" rel="external nofollow" >上一页</a> <c:forEach begin="${requestScope.pageBean.start}" end="${requestScope.pageBean.end}" var="i"> <c:if test="${requestScope.pageBean.pageNum == i}"> ${i} </c:if> <c:if test="${requestScope.pageBean.pageNum != i}"> <a href="${pageContext.request.contextPath}/main?pageNum=${i}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${i}</a> </c:if> </c:forEach> <a href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum+1}" rel="external nofollow" rel="external nofollow" >下一页</a> </c:if> <c:if test="${requestScope.pageBean.pageNum == requestScope.pageBean.totalPage}"> <a href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum-1}" rel="external nofollow" rel="external nofollow" >上一页</a> <c:forEach begin="${requestScope.pageBean.start}" end="${requestScope.pageBean.end}" var="i"> <c:if test="${requestScope.pageBean.pageNum == i}"> ${i} </c:if> <c:if test="${requestScope.pageBean.pageNum != i}"> <a href="${pageContext.request.contextPath}/main?pageNum=${i}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${i}</a> </c:if> </c:forEach> </c:if> <a href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.totalPage}" rel="external nofollow" >尾页</a><br><br> 跳转到 <input type="text" id="pageNum" size="1px"></input>页 <a href="javascript:gos()" rel="external nofollow" >确定</a>, 共[${requestScope.pageBean.totalPage }]页,[${requestScope.pageBean.totalRecord}]条记录 </center> </body></html>

4.创建Servlets.class，参考代码如下：

@WebServlet("/main")public class Servlets extends HttpServlet { @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String page = request.getParameter("pageNum"); int pageNum = Integer.parseInt((page == null ? "1" : page)); int pageSize = 5; Service s = new Service(); PageBean<User> pb = s.findAll(pageNum, pageSize); request.setAttribute("pageBean", pb); request.getRequestDispatcher("/main.jsp").forward(request, response); }}

5.创建Service.class，参考代码如下：

public class Service { public PageBean<User> findAll(int pageNum, int pageSize) { UserDao userDao = new UserDao(); List<User> users = userDao.findAll(); int totalRecord = users.size(); PageBean<User> pb = new PageBean<>(pageNum, pageSize, totalRecord); pb.setList(users); return pb; }}

6.创建UserDao.class，参考代码如下：

public class UserDao { List<User> users=new ArrayList<>(); User user; public List<User> findAll(){ for(int i=1;i<99;i++){ user=new User("name-"+i, (int)(100*Math.random()), (int)(10*Math.random())%2==1?"男":"女"); users.add(user); } return users; }}

需注意的问题：

1.需在WebContent下创建文件夹jquery，在他里面放入jquery.min.js这个文件。否则跳转功能异常。

2.index.jsp与main.jsp都在WebContent文件夹下。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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