java實(shí)現(xiàn)分頁(yè)顯示效果

發(fā)布時(shí)間：2020-09-29 17:38:12 來(lái)源：腳本之家閱讀：138 作者：魔靈兒欄目：編程語(yǔ)言

本文實(shí)例為大家分享了java實(shí)現(xiàn)頁(yè)顯示效果的具體代碼，供大家參考，具體內(nèi)容如下

效果圖如下：

實(shí)現(xiàn)步驟：

1.創(chuàng)建實(shí)體User.class,參考代碼如下：

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.創(chuàng)建分頁(yè)模型PageBean.class,參考代碼如下：

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.創(chuàng)建jsp頁(yè)面，參考代碼如下：

/**
 *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://www.w3.org/TR/html4/loose.dtd">
<html>
 <head> 
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>Insert title here</title>
 </head>
 <body>
  <a href="${pageContext.request.contextPath }/main" rel="external nofollow" >分頁(yè)顯示</a>
 </body>
</html>
 
/**
 *main.jsp
 */
<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/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("輸入的不是數(shù)字 ，請(qǐng)輸入數(shù)字！");
 return ;
 }
 if(pageNum==""){
 alert("輸入為空，請(qǐng)重新輸入！");
 return ;
 }
 if(pageNum<1||pageNum>${requestScope.pageBean.totalPage}){
 alert("超出范圍，請(qǐng)重新輸入！");
 return ;
 }
   location.href="${pageContext.request.contextPath}/main?pageNum=" rel="external nofollow" +pageNum;
 }
  </script>
  <title>分頁(yè)顯示</title>
 </head>
 <body>
 <center>
 <table width="40%" >
 <tr>
 <th>姓名</th>
 <th>性別</th>
 <th>年齡</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="${pageContext.request.contextPath}/main?pageNum=1" rel="external nofollow" >首頁(yè)</a>
 <c:if test="${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" >下一頁(yè)</a>
 </c:if>
 
 <c:if
 test="${requestScope.pageBean.pageNum > 1 && requestScope.pageBean.pageNum < requestScope.pageBean.totalPage}">
 <a
 href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum-1}" rel="external nofollow" rel="external nofollow" >上一頁(yè)</a>
 <c:forEach begin="${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" >下一頁(yè)</a>
 </c:if>
 
 <c:if
 test="${requestScope.pageBean.pageNum == requestScope.pageBean.totalPage}">
 <a
 href="${pageContext.request.contextPath}/main?pageNum=${requestScope.pageBean.pageNum-1}" rel="external nofollow" rel="external nofollow" >上一頁(yè)</a>
 <c:forEach begin="${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=${requestScope.pageBean.totalPage}" rel="external nofollow" >尾頁(yè)</a><br><br>
 跳轉(zhuǎn)到
  <input type="text" id="pageNum" size="1px"></input>頁(yè)
  <a href="javascript:gos()" rel="external nofollow" >確定</a>, 共[${requestScope.pageBean.totalPage }]頁(yè),[${requestScope.pageBean.totalRecord}]條記錄
 </center>
 </body>
</html>

4.創(chuàng)建Servlets.class，參考代碼如下：

@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.創(chuàng)建Service.class，參考代碼如下：

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.創(chuàng)建UserDao.class，參考代碼如下：

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;
 }
}

需注意的問(wèn)題：

1.需在WebContent下創(chuàng)建文件夾jquery，在他里面放入jquery.min.js這個(gè)文件。否則跳轉(zhuǎn)功能異常。

2.index.jsp與main.jsp都在WebContent文件夾下。

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持億速云。

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java實(shí)現(xiàn)分頁(yè)顯示效果

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