Spring+Hibernate+struts2+JPA 注解+跨域//完成手机端点击加载更多 下拉加载更多

一、使用IDEA新建一个maven项目(student)

1.1.0编写pom文件，添加项目所需要的包

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.spring</groupId>
        <artifactId>parent</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <artifactId>student</artifactId>
    <packaging>war</packaging>

    <properties>
        <struts2.version>2.5.8</struts2.version>
        <hibernate.version>5.2.8.Final</hibernate.version>
    </properties>

    <!-- 配置打包插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <warSourceDirectory>web</warSourceDirectory>
                    <webXml>webWEB-INFweb.xml</webXml>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <!-- struts2 -->
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>${struts2.version}</version>
        </dependency>
        <!-- struts2整合spring的插件 -->
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-spring-plugin</artifactId>
            <version>${struts2.version}</version>
            <!-- 排除整合插件自动依赖的spring核心包，
            不然可能会引起版本不一致或冲突的情况。所以使用exclusion
             排除循环依赖-->
            <exclusions>
                <!-- 排除struts自动依赖的spring-core版本 -->
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-core</artifactId>
                </exclusion>
                <!-- 排除struts自动依赖的spring-beans版本 -->
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-beans</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- JSON插件 -->
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-json-plugin</artifactId>
            <version>${struts2.version}</version>
        </dependency>
        <!-- 引入aspectj的依赖模块 -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.9</version>
        </dependency>
        <!-- 引入spring web模块 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <!-- 引入spring orm 整合hibernate-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <!--  引入Spring tx事务管理模块-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <!-- Hibernate依赖 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!-- JPA依赖支持，添加实体管理器 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!-- DBCP连接池 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <!--  mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
        </dependency>
    </dependencies>
</project>

在这里我用的是MySql数据库，所以在这里添加MySql的驱动包，其他的数据库添加相应的驱包就行了

在这里我继承了父类的pom文件

父类的pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.spring</groupId>
    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <!-- 配置maven的常规属性 -->
    <properties>
        <!-- 设置整个maven项目的编码格式 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!-- 设置控制台输出参数的编码格式， 解决乱码  -->
        <orgLine>-Dfile.encoding=UTF-8</orgLine>
    </properties>

    <build>
        <plugins>

            <!-- 配置maven编译插件，指定maven编译版本 -->
            <plugin>
                <!-- 插件名称 -->
                <artifactId>maven-compiler-plugin</artifactId>
                <!-- 插件配置信息 -->
                <configuration>
                    <target>1.8</target>
                    <source>1.8</source>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
    </dependencies>

</project>

添加进来的包如下

二、给项目添加Spring支持 以及Web 支持

三、给项目新建好相应的包

在这里没有写建表语句  自动建表   容器在启动的时候会把所需要的表建出来(在ApplicationContext.xml 里面)

        <!-- 是否自动执行DDL语句，(自动建表)-->
        <property name="generateDdl" value="true"/>

实体类(entity)

 3.0.1(Student)

package org.student.entity;

import javax.persistence.*;

/**
 * Created by YongLin on 17/3/14.
 */
@Entity
@Table(name="STU_INFO")
public class Student {
    private int sid;
    private String stuName;
    private int age;
    private Team team;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "STU_ID")
    public int getSid() {
        return sid;
    }

    public void setSid(int sid) {
        this.sid = sid;
    }
    @Column(name = "STU_NAME")
    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    @Column(name = "STU_AGE")
    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @ManyToOne
    @JoinColumn(name = "TEAM_ID")
    public Team getTeam() {
        return team;
    }

    public void setTeam(Team team) {
        this.team = team;
    }
}

 3.0.2(Team)

package org.student.entity;

import javax.persistence.*;

/**
 * Created by YongLin on 17/3/15.
 */
@Entity
@Table(name = "TEAM_INFO")
public class Team {
    private int tid;
    private String teamName;


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "TEAM_ID")
    public int getTid() {
        return tid;
    }

    public void setTid(int tid) {
        this.tid = tid;
    }

    @Column(name = "TEAM_NAME")
    public String getTeamName() {
        return teamName;
    }

    public void setTeamName(String teamName) {
        this.teamName = teamName;
    }
}

3.1.1(dao)里面有2个接口  对应2个实现类

3.1.2StuDao

package org.student.dao;

import org.student.entity.Student;

import java.util.List;

/**
 * Created by wangl on 2017/2/27.
 */
public interface StuDao {
    //查询所有学生
    public List<Student> findStudents();

    public void save(Student student);

    public List<Student> findByTeam(int tid);

    public Student findById(int sid);

    public List<Student> findStudents(int first, int max);
}

3.1.3 StuDaoImpl

package org.student.dao.impl;

import org.springframework.stereotype.Repository;
import org.student.dao.StuDao;
import org.student.entity.Student;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import java.util.List;

/**
 * Created by YongLin on 17/3/14.
 */
@Repository("stuDao")
public class StuDaoImpl  implements StuDao {
    @PersistenceContext
    private EntityManager em;
    @Override
    public List<Student> findStudents() {
        String jpql = "from Student s";
        return em.createQuery(jpql).getResultList();
    }

    @Override
    public void save(Student student) {
            em.persist(student);
        }

    @Override
    public List<Student> findByTeam(int tid) {
        String jpql = "from Student s where s.team.tid=?1";
        Query query = em.createQuery(jpql);
        query.setParameter(1,tid);
        return query.getResultList();
        /*String jqpl = "from Student s where s.team.tid=?1";
        Query query = em.createQuery(jqpl);
        query.setParameter(1,tid);
        return query.getResultList();*/
    }
    @Override
    public Student findById(int sid) {
        return null;
    }


    @Override
    public List<Student> findStudents(int first, int max) {
        String jpql = "from Student s";
        Query query = em.createQuery(jpql);
        //分页
        query.setFirstResult(first);
        query.setMaxResults(max);
        return query.getResultList();
    }
}

 

四、给项目配置好 所以需的配置文件

3.2.1TeamDao

package org.student.dao;
import org.student.entity.Team;

import java.util.List;

/**
 * Created by YongLin on 17/3/15.
 */
public interface TeamDao {
    public List<Team> findTeams();
    public  void save(Team team);
}

3.2.2TeamDaoImpl

package org.student.dao.impl;

import org.springframework.stereotype.Repository;
import org.student.dao.TeamDao;
import org.student.entity.Team;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;

/**
 * Created by YongLin on 17/3/15.
 */
@Repository("teamDao")
public class TeamDaoImpl implements TeamDao {
    @PersistenceContext
    private EntityManager em;

    @Override
    public List<Team> findTeams() {
        String hql="from Team t";
        return em.createQuery(hql).getResultList();
    }

    @Override
    public void save(Team team) {
        em.persist(team);
    }

}

3.3.1StuService

package org.student.service;

import org.springframework.stereotype.Service;
import org.student.entity.Student;

import java.util.List;

/**
 * Created by YongLin on 17/3/14.
 */
@Service("stuService")
public interface StuService {
    public List<Student> findStudent();
    public void add(Student student);
    public List<Student> findByTeam(int tid);
    public List<Student> findStudents(int first, int max);
}

 3.3.2StuServiceImpl

package org.student.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.student.dao.StuDao;
import org.student.entity.Student;
import org.student.service.StuService;

import java.util.List;

/**
 * Created by YongLin on 17/3/14.
 */
@Service("stuService")
@Transactional
public class StuServiceImpl implements StuService {
    @Autowired
    private StuDao stuDao;
    @Override
    public List<Student> findStudent() {
        return stuDao.findStudents();
    }

    @Override
    public void add(Student student) {
        stuDao.save(student);
    }

    @Override
    public List<Student> findByTeam(int tid) {
        return stuDao.findByTeam(tid);
    }

    @Override
        public List<Student> findStudents(int first, int max) {
        return stuDao.findStudents(first,max);
    }
}

3.3.3TeamService

package org.student.service;
import org.student.entity.Team;

import java.util.List;

/**
 * Created by YongLin on 17/3/15.
 */
public interface TeamSevice {
    public List<Team> findTeams();
    public void save(Team team);
}

3.3.4TeamServiceImpl

package org.student.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.student.dao.TeamDao;
import org.student.entity.Team;
import org.student.service.TeamSevice;

import java.util.List;

/**
 * Created by YongLin on 17/3/15.
 */
@Service("teamService")
@Transactional
public class TeamService implements TeamSevice {
    @Autowired
    private TeamDao teamDao;
    @Override
    public List<Team> findTeams() {
        return teamDao.findTeams();
    }

    @Override
    public void save(Team team) {
        teamDao.save(team);
    }
}

 Action(StuAction)

package org.student.action;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.student.entity.Student;
import org.student.entity.Team;
import org.student.service.StuService;
import org.student.service.TeamSevice;

import java.util.List;

/**
 * Created by YongLin on 17/3/14.
 */
@Controller("stuAction")
public class StuAction {
    private Student student;
    private String message;
    private List<Student> studentList;
    private List<Team> teamList;
    private Team team;
    private int pageNum;

    public int getPageNum() {
        return pageNum;
    }

    public void setPageNum(int pageNum) {
        this.pageNum = pageNum;
    }

    //注入一个Service
    @Autowired
    private StuService stuService;
    @Autowired
    private TeamSevice teamSevice;

    public Student getStudent() {
        return student;
    }

    public void setStudent(Student student) {
        this.student = student;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public List<Student> getStudentList() {
        return studentList;
    }

    public void setStudentList(List<Student> studentList) {
        this.studentList = studentList;
    }

    public List<Team> getTeamList() {
        return teamList;
    }

    public void setTeamList(List<Team> teamList) {
        this.teamList = teamList;
    }

    public StuService getStuService() {
        return stuService;
    }

    public void setStuService(StuService stuService) {
        this.stuService = stuService;
    }

    public TeamSevice getTeamSevice() {
        return teamSevice;
    }

    public void setTeamSevice(TeamSevice teamSevice) {
        this.teamSevice = teamSevice;
    }

    public Team getTeam() {
        return team;
    }

    public void setTeam(Team team) {
        this.team = team;
    }

    public String find(){
       studentList =  stuService.findStudent();
        return "success";
    }

    public String findByPage(){
        //第一个参数表示从第几条开始查MySql的0表示第一条 第二个参数表示查询几条
        System.out.println(pageNum);
        studentList=stuService.findStudents(pageNum,5);
        return  "page";
    }

    public String findStusByTeam(){
        studentList = stuService.findByTeam(team.getTid());
        return "byTeamList";
    }

    public String findTeams(){
        teamList = teamSevice.findTeams();
        return "teams";
    }
}

编写CorsFilter(跨域用的  设置响应头部)  实现了Filter

package org.student.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class CrosFilter implements Filter{

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {
        //相应之前设置响应的头部，授权跨域访问
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setDateHeader("Expires", 0);
        //放行
        filterChain.doFilter(req,res);
    }
    @Override
    public void destroy() {

    }
}

4.0.1在resource 下面新建applicantionContext.xml  struts.xml如下：

4.1.2applicantionContext.xml 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 启用相应的注解处理器,扫描指定的包 -->
    <context:component-scan base-package="org.student"/>

    <!-- 配置数据源，使用DBCP连接池 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <!-- 数据源以及连接池属性 -->
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mydate"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
        <property name="initialSize" value="5"/>
        <property name="maxIdle" value="50"/>
        <property name="maxActive" value="60"/>
        <property name="minIdle" value="10"/>
        <property name="maxWait" value="2000"/>
    </bean>

    <!-- 配置JPA实现方的适配器,因为JPA实现方有很多，
    Hibernate也是JPA标准的一种实现，因此这里指定为Hibernate的JPA实现适配器-->
    <bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <!-- 配置JPA的属性 -->
        <!-- 使用的数据库类型,这里使用的是MYSQL -->
        <property name="database" value="MYSQL"/>
        <!-- 指定数据库方言-->
        <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect"/>
        <!-- 在控制台显示sql语句-->
        <property name="showSql" value="true"/>
        <!-- 是否自动执行DDL语句，(自动建表)-->
        <property name="generateDdl" value="true"/>
    </bean>

    <!-- 配置实体管理器工厂，Spring会依据这个工厂创建并注入一个实体管理器EntityManager,
    创建出来的EntityManager是由Spring容器管理的，并且会参与到Spring的事务当中,它是线程安全的-->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <!-- 需要注入一个数据源和JPA的适配器 -->
        <property name="dataSource" ref="dataSource"/>
        <property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>
        <!-- 指定实体的扫描路径 -->
        <property name="packagesToScan" value="org.student.entity"/>
    </bean>

    <!-- 配置JPA事务管理器-->
    <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <!-- 需要注入一个实体管理器工厂 -->
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

    <!-- 启用注解事务管理,transaction-manager引用上面的事务管理器-->
    <tx:annotation-driven transaction-manager="txManager"/>
</beans>

 4.0.3  struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>
    <package name="struts" extends="json-default">
        <action name="find" class="stuAction" method="find">
            <result type="json">
                <param name="root">studentList</param>
            </result>
        </action>
        <action name="findByPage" class="stuAction" method="findByPage">
            <result type="json" name="page">
                <param name="root">studentList</param>
            </result>
        </action>

        <action name="findStusByTeam" class="stuAction" method="findStusByTeam">
            <result type="json" name="byTeamList">
                <param name="root">studentList</param>
            </result>
        </action>

        <action name="findTeams" class="stuAction" method="findTeams">
            <result type="json" name="teams">
                <param name="root">teamList</param>
            </result>
        </action>
    </package>
</struts>

 以及在Web下添加相应的文件

 Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <!-- 配置监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 指定spring核心配置文件所在的目录 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <!-- 默认会从WEB—INF下查找applicationContext.xml -->
        <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>
    <filter>
        <filter-name>crosFilter</filter-name>
        <filter-class>org.student.filter.CrosFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>crosFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- struts2核心控制器 -->
    <filter>
        <filter-name>dispatcher</filter-name>
        <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>dispatcher</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

在前端页面这边，发起Ajax请求  跨域拿到后台查出的数据

5.0.1 (点击加载更多  clickmore.html)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
       <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no">
    <title>Title</title>
    <script src="myjs/jquery-1.11.0.js"></script>
    <style>
        #box .box{
             width: 100%;
            height: 100px;
            padding: 10px 0;
            border: 1px slateblue solid;
            border-left:none;
            border-right: none;
            font-family: "Microsoft YaHei";
         }
        h4{
            text-align: center;
            color: red;
            cursor: pointer;
        }
    </style>
    <script type="text/javascript">
        $(function(){
            //定义一个成员变量
            //从第一条开始查
            var pageNum = 0;
            //页面一加载    从第0 条数据开始加载  MySql的第0 条是第一条
        $.get("http://localhost:8080/findByPage",{"pageNum":pageNum}, function (date) {
                    //查出来的数据填充到div中
                    addBox(date);
            });
            //点击“点击加载更多”的时候
        $("#divAdd").click(function() {
            //发起一个跨域的请求  每次请求5条数据 每次从当前条数的后5条数据开始查(Hibernate提供的分页查询的方法)
                $.get("http://localhost:8080/findByPage",{"pageNum":pageNum+=5}, function (date) {
                    addBox(date);
                });
        });
    function addBox(date){
        $.each(date,function(index,obj){
                           $("#box").append("<div class='box'>"+
                        "<div class='div2'>ID："+obj.sid+"</div>"+
                        "<div class='div1'>姓名："+obj.stuName+"</div>"+
                        "<div class='div1'>班级："+obj.team.teamName+"</div>"+
                        "</div>");
                    });
            }
        });                
</script>
</head>
<body>
    <div id="box">
        
    </div>
        <h4 id="divAdd">点击加载更多。。。</h4>
</body>
</html>

运行效果：

初始化先查出5条数据

点击"加载更多时"，又从后台查出5条数据  

 5.0.2（下滑加载更多 upmore.html)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1,maximum-scale=1,user-scalable=no">
    <title>Title</title>
    <script src="myjs/jquery-1.11.0.js"></script>
    <style>
        #box .box {
            width: 100%;
            height: 100px;
            padding: 10px 0;
            border: 1px slateblue solid;
            border-left:none;
            border-right: none;
            font-family: "Microsoft YaHei";
        }

        .div2 {
            margin-top: -1px
        }
    </style>
    <script type="text/javascript">
        $(function () {
            //定义一个成员变量
            //从第一条开始查
            var pageNum = 0;
            //页面一加载    从第0 条数据开始加载  MySql的第0 条是第一条
            $.get("http://localhost:8080/findByPage", {"pageNum": pageNum}, function (date) {
                //查出来的数据填充到div中
                addBox(date);
            });
            //鼠标滚动事件
            $(window).scroll(function () {
                if ($(document).scrollTop() >= $(document).height() - $(window).height()) {
                    //当页面移动到最底部的时候
                    //发起一个请求 ，每一次请求查询3条记录
                    $.get("http://localhost:8080/findByPage", {"pageNum": pageNum += 3}, function (date) {
                        addBox(date);
                    });
                }
            });
            function addBox(date) {
                $.each(date, function (index, obj) {
                    $("#box").append("<div class='box'>" +
                        "<div class='div2'>ID：" + obj.sid + "</div>" +
                        "<div class='div1'>姓名：" + obj.stuName + "</div>"+
                        "</div>");
                });
            }
        });

    </script>


</head>
<body>
<div id="box">


</div>
</body>
</html>

运行效果：

页面加载  查出5条数据显示在页面上：

当滚动条滑到最底端的时候，又发起一个请求 去查询出5条数据

项目整体结构如下：