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jsp servlet javaBean后臺分頁實例代碼解析

首先后臺分頁需要理清分頁思路，把數據庫里面需要分頁的信息放到List集合中，然后按照頁面反饋給后臺的頁碼對List集合進行SubList切割把切完的List傳到前端進行顯示。

1.分頁的demo文件結構圖

導入的包

2.代碼

SplitPageServlet代碼

package ActionServlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Bean.ProjectBean;
import Service.SplitPage;

/**
 * Servlet implementation class SplitPageServlet
 */
@WebServlet("/SplitPageServlet")
public class SplitPageServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
  
 /**
  * @see HttpServlet#HttpServlet()
  */
 public SplitPageServlet() {
  super();
  // TODO Auto-generated constructor stub
 }

 /**
  * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  ListProjectBean>listArr = new ArrayListProjectBean>();
  String currrentPageString = request.getParameter("currrentPage");
  String numberForSplitPage = request.getParameter("numberForSplitPage");
  if( currrentPageString ==null){
   currrentPageString = "1";
  }
  if( numberForSplitPage == null){
   numberForSplitPage = "5";
  }
  SplitPage splitPage = new SplitPage();
  try {
   listArr = splitPage.AllSplitPage(numberForSplitPage, currrentPageString);
   request.setAttribute("subResult", listArr);
  } catch (ClassNotFoundException | SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  System.out.println(SplitPage.pageNumber);
  System.out.println(SplitPage.currentPageIndex);
  request.setAttribute("pageNumber", SplitPage.pageNumber);
  request.setAttribute("currentPageIndex", SplitPage.currentPageIndex);
  request.getRequestDispatcher("/servlet/ShowViewIndex").forward(request, response);
  
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

ProjectBean代碼

package Bean;

public class ProjectBean {
 private String projectId = null;
 private String projectName = null;
 private String projectType = null;
 private String userNo = null;
 private String projectUser = null;
 public String getProjectId(){
  if(projectId==null){
   projectId ="";
  }
  return this.projectId;
 }
 public void setProjectId(String projectId){
  this.projectId = projectId;
 }
 
 public void setProjectName(String projectName){
  this.projectName = projectName;
 }
 
 public String getProjectName(){
  return this.projectName;
 }
 
 public void setType(String projectType){
  this.projectType = projectType;
 }
 
 public String getProjectType(){
  return this.projectType;
 }
 
 public void setUserNo(String userNo){
  this.userNo = userNo;
 }
 
 public String getUserNo(){
  return this.userNo;
 }
 
 public void setProjectUser(String projectUser){
  this.projectUser = projectUser;
 }
 
 public String getProjectUser(){
  return this.projectUser;
 }
 
}

SplitPageBean 代碼

package Bean;

public class SplitPageBean {
 private int allitems;//總的記錄數
 private int currentRecord;//當前的記錄數
 private int lastPageRecord ; //上一頁記錄數開始數
 private int nextPageRecord;//下一頁記錄數開始數
 private int lastPageIndex ; //上一頁
 private int nextPageIndex;//下一頁
 private int currentPageIndex;//當前頁
 private int numberForSplitPage;//每頁分的數量
 private int allPageNumber;

 public int getAllitems(){
  return this.allitems;
 }
 public void setAllitems(int allitems){
  this.allitems = allitems; 
 }
 
 public int getCurrentRecord(){
  return this.currentRecord;
 }
 public void setCurrentRecord(int currentPageIndex){
  this.currentRecord = currentPageIndex * this.numberForSplitPage; 
 }
 
 public int getlastPageRecord(){
  return this.lastPageRecord;
 }
 public void setLastPageRecord(int lastPageIndex){
  this.lastPageRecord = lastPageIndex * this.numberForSplitPage; 
 }
 
 public int getNextPageRecord(){
  return this.nextPageRecord;
 }
 public void setNextPageRecord(int nextPageIndex){
  this.nextPageRecord = nextPageIndex * this.numberForSplitPage; 
 }
 
 public int getLastPageIndex(){
  return this.lastPageIndex;
 }
 public void setLastPageIndex(int currentPageIndex){
  this.lastPageIndex = currentPageIndex - 1; 
 }
 
 public int getNextPageIndex(){
  return this.nextPageIndex;
 }
 public void setNextPageIndex(int currentPageIndex){
  this.nextPageIndex = currentPageIndex - 1; 
 }
 
 public int getCurrentPageIndex(){
  return this.currentPageIndex;
 }
 public void setCurrentPageIndex(int currentPageIndex){
  this.currentPageIndex = currentPageIndex; 
 }
 
 public int getNumberForSplitPage(){
  return this.numberForSplitPage;
 }
 public void setNumberForSplitPage(int numberForSplitPage){
  this.numberForSplitPage = numberForSplitPage; 
 }
 
 public int getAllPageNumber(){
  return this.allPageNumber;
 }
 public void setAllPageNumber(int allitems){
  this.allPageNumber = allitems / this.numberForSplitPage + 1; 
 } 
 
}

QueryProject代碼

package Dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import Bean.ProjectBean;
import Service.ConnectDataBase;

public class QueryProject {
 private ListProjectBean> listArr = new ArrayList();
 public ListProjectBean> QueryAllProject() throws ClassNotFoundException, SQLException{
  Connection conn=null;
  Statement stat=null;
  ResultSet rs=null;
  ConnectDataBase connectDataBase =new ConnectDataBase();
  conn = connectDataBase.connect();
  stat = conn.createStatement();
  rs = stat.executeQuery("select*from project");
  
  while(rs.next()){
   ProjectBean projectBean = new ProjectBean();
   projectBean.setProjectId(rs.getString("projectId"));
   projectBean.setProjectName(rs.getString("projectName"));
   projectBean.setType(rs.getString("projectType"));
   projectBean.setUserNo(rs.getString("UserNo"));
   projectBean.setProjectUser(rs.getString("projectUser"));
   listArr.add(projectBean);
  }
  connectDataBase.close(stat, conn);
  return listArr;
 }
// public static void main(String[] args) throws ClassNotFoundException, SQLException{
//  ListProjectBean> listArr = new ArrayList();
//  QueryProject queryProject = new QueryProject();
//  listArr = queryProject.QueryAllProject();
//  ProjectBean projectBean = new ProjectBean();
//  projectBean = listArr.get(0);
//  System.out.println(projectBean.getProjectId());
//  projectBean = listArr.get(2);
//  System.out.println(projectBean.getProjectId());
//  System.out.println(listArr.size());
// }
}

ConenctDataBase代碼

package Service;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class ConnectDataBase {
 private String url = "jdbc:MySQL://localhost:3306/zhongchuangweb";
 private String user = "root";
 private String password = "12345";
 
 public Connection connect() throws ClassNotFoundException, SQLException{
   Class.forName("com.mysql.jdbc.Driver");
   Connection conn = DriverManager.getConnection(url,user,password); 
   return conn;
 }
 //關閉數據庫資源
 public void close(Statement stat,Connection conn) throws SQLException{
  if(stat!=null){
    stat.close();
  }
  if(conn!=null){
    conn.close();
  }
 }
}

SplitPage代碼

package Service;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import Bean.ProjectBean;
import Bean.SplitPageBean;
import Dao.QueryProject;

public class SplitPage {
 public static int pageNumber;
 public static int currentPageIndex;
 private ListProjectBean> splitArr = new ArrayList(); 

 {
  QueryProject queryProject = new QueryProject();
  try {
   splitArr = queryProject.QueryAllProject();
  } catch (ClassNotFoundException | SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 public ListProjectBean> AllSplitPage(String numberForSplitPage,String requestPageIndex) throws ClassNotFoundException, SQLException{
  ListProjectBean> result = new ArrayListProjectBean>(); 
  int numberForSplitPageInt = Integer.parseInt(numberForSplitPage);//每頁的數量
  int requestPageIndexInt = Integer.parseInt(requestPageIndex);//請求的頁碼
  SplitPageBean splitPageBean = new SplitPageBean();
  splitPageBean.setAllitems(splitArr.size());//設置總的記錄數
  splitPageBean.setNumberForSplitPage(numberForSplitPageInt);//設置每頁的記錄數量
  splitPageBean.setAllPageNumber(splitArr.size());
  pageNumber = splitPageBean.getAllPageNumber();
  splitPageBean.setCurrentPageIndex(requestPageIndexInt);//設置請求頁頁碼
  currentPageIndex = splitPageBean.getCurrentPageIndex();
  splitPageBean.setLastPageRecord(requestPageIndexInt-1);
  if(splitPageBean.getAllitems()splitPageBean.getNumberForSplitPage()){
   result = splitArr;
  }else if(splitPageBean.getCurrentPageIndex()*splitPageBean.getNumberForSplitPage() > splitPageBean.getAllitems()){
   result = splitArr.subList(splitPageBean.getlastPageRecord(),splitPageBean.getAllitems());
  }else{
   result = splitArr.subList(splitPageBean.getlastPageRecord(),splitPageBean.getlastPageRecord()+splitPageBean.getNumberForSplitPage());//SubList用法不包含末尾索引
  }
  return result;
 }
 
// public static void main(String[] args) throws ClassNotFoundException, SQLException{
//  ListProjectBean> TestResult = new ArrayListProjectBean>(); 
//  ProjectBean projectBean = new ProjectBean();
//  SplitPage splitPage = new SplitPage();
//  TestResult = splitPage.AllSplitPage("5","1");
//  projectBean = TestResult.get(0);
//  System.out.println(projectBean.getProjectId());
//  projectBean = TestResult.get(1);
//  System.out.println(projectBean.getProjectId());
//  projectBean = TestResult.get(2);
//  System.out.println(projectBean.getProjectId());
//  projectBean = TestResult.get(3);
//  System.out.println(projectBean.getProjectId());
//  projectBean = TestResult.get(4);
//  System.out.println(projectBean.getProjectId());
//  projectBean = TestResult.get(5);
//  System.out.println(projectBean.getProjectId());
//    
// }

}

顯示層
ShowViewIndex代碼

package View;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ShowViewIndex
 */
@WebServlet("/ShowViewIndex")
public class ShowViewIndex extends HttpServlet {
 private static final long serialVersionUID = 1L;
  
 /**
  * @see HttpServlet#HttpServlet()
  */
 public ShowViewIndex() {
  super();
  // TODO Auto-generated constructor stub
 }

 /**
  * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  request.getRequestDispatcher("/NewFile.jsp").forward(request, response);
 }

 /**
  * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  */
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
  doGet(request, response);
 }

}

jsp頁面代碼

%@ 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=ISO-8859-1">
title>數據庫內容分頁顯示/title>
style type="text/css">
*{ margin:0; padding:0;}
ul li{ width:50px; height:24px; line-height:24px; float:left; margin-left:0px; display:inline; margin-top:5px; overflow:hidden;}
ul li button{width:50px;height:24px;margin:0px;padding:0px;}
/style>
/head>
body>
 table>
  thead>
   tr>
    th style="text-align:center;">編號/th>
    th style="text-align:center;">名稱/th>
    th style="text-align:center;">類型/th>
    th style="text-align:center;">學號/th>
    th style="text-align:center;">負責人/th>
   /tr>
  /thead>
  tbody>
    c:forEach var="project" items="${subResult}">
     tr>
      td>c:out value="${project.projectId}">/c:out>/td>
      td>c:out value="${project.projectName}">/c:out>/td>
      td>c:out value="${project.projectType}">/c:out>/td>
      td>c:out value="${project.userNo}">/c:out>/td>
      td>c:out value="${project.projectUser}">/c:out>/td>
     /tr>
    /c:forEach>
  /tbody>
 /table>
 div align = "center">
    ul>
    c:choose>
     c:when test="${currentPageIndex>1}">
       li>a href="${pageContext.request.contextPath}/servlet/SplitPageServlet?currrentPage=${currentPageIndex-1}">button>/button>/a>/li>
     /c:when>
     c:otherwise>
       li>a>button>/button>/a>/li>
     /c:otherwise>
    /c:choose>
     %
        int i =(Integer)request.getAttribute("pageNumber");
       for (int j=0;ji;j++)
       {%>
       li>a href="${pageContext.request.contextPath}/servlet/SplitPageServlet?currrentPage=%=j+1%>">button>%=j+1%>/button>/a>/li>
      %}%>
     c:choose>
     c:when test="${currentPageIndex+1=pageNumber}">
       li>a href="${pageContext.request.contextPath}/servlet/SplitPageServlet?currrentPage=${currentPageIndex+1}">button>>/button>/a>/li>
     /c:when>
     c:otherwise>
       li>a>button>>/button>/a>/li>
     /c:otherwise>
    /c:choose>
    /ul> 
   /div> 
/body>
/html>

xml代碼

?xml version="1.0" encoding="UTF-8"?>
web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 display-name>/display-name>
 welcome-file-list>
 welcome-file>SplitPageServlet/welcome-file>
 /welcome-file-list> 
 servlet>
 servlet-name>ShowViewIndex/servlet-name>
 servlet-class>View.ShowViewIndex/servlet-class>
 /servlet>
 servlet-mapping>
 servlet-name>ShowViewIndex/servlet-name>
 url-pattern>/servlet/ShowViewIndex/url-pattern>
 /servlet-mapping>
 servlet>
 servlet-name>SplitPageServlet/servlet-name>
 servlet-class>ActionServlet.SplitPageServlet/servlet-class>
 /servlet>
 servlet-mapping>
 servlet-name>SplitPageServlet/servlet-name>
 url-pattern>/servlet/SplitPageServlet/url-pattern>
 /servlet-mapping>
/web-app>

運行結果展示

數據庫describe

同時在本次demo中認識到了xml的中使用歡迎界面通過 welcome-file-list> welcome-file>靜態界面（jsp html）/welcome-file> /welcome-file-list>還可以使用servlet直接用servlet名即可。
初學java和javaee 寫一點自己做的東西，代碼寫的不是很規范，不喜勿噴。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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