5、SpringBoot+MyBaits+Maven+Idea+pagehelper分页插件

1、为了我们平时方便开发，我们可以在同一个idea窗口创建多个项目模块，创建方式如下

2、项目中pom.xm文件的内容如下

 <?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>
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.1.3.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
     <groupId>cn.kgc</groupId>
     <artifactId>springbootmybatis</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <name>springbootmybatis</name>
     <description>Demo project for Spring Boot</description>

     <properties>
         <java.version>1.8</java.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-jdbc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter</artifactId>
             <version>2.0.0</version>
         </dependency>
         <!--一定注意版本号，此处需要修改，把默认score的删掉哦-->
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.38</version>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
        <!--spring boot 分页查询，需要手动配置-->
         <dependency>
             <groupId>com.github.pagehelper</groupId>
             <artifactId>pagehelper-spring-boot-starter</artifactId>
             <version>1.2.3</version>
         </dependency>

     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

pom.xml

3、项目结构如下

4、在pojo包下创建Classes.java

 package cn.kgc.pojo;
 import java.io.Serializable;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public class Classes implements Serializable{
     private Integer cid;
     private String cname;

     public Classes() {
     }

     public Classes(Integer cid, String cname) {
         this.cid = cid;
         this.cname = cname;
     }

     public Integer getCid() {
         return cid;
     }

     public void setCid(Integer cid) {
         this.cid = cid;
     }

     public String getCname() {
         return cname;
     }

     public void setCname(String cname) {
         this.cname = cname;
     }

     @Override
     public String toString() {
         return "Classes{" +
                 "cid=" + cid +
                 ", cname='" + cname + '\'' +
                 '}';
     }
 }

Classes.java

5、在pojo包下创建Student.java

 package cn.kgc.pojo;
 import java.io.Serializable;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public class Student implements Serializable{
     private Integer sid;
     private String sname;
     private String password;
     private String subject;
     private Double result;
     private Classes classes;

     public Student() {
     }

     public Student(Classes classes) {
         this.classes = classes;
     }

     public Student(Integer sid, String sname, String password, String subject, Double result, Classes classes) {
         this.sid = sid;
         this.sname = sname;
         this.password = password;
         this.subject = subject;
         this.result = result;
         this.classes = classes;
     }

     public Integer getSid() {
         return sid;
     }

     public void setSid(Integer sid) {
         this.sid = sid;
     }

     public String getSname() {
         return sname;
     }

     public void setSname(String sname) {
         this.sname = sname;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String getSubject() {
         return subject;
     }

     public void setSubject(String subject) {
         this.subject = subject;
     }

     public Double getResult() {
         return result;
     }

     public void setResult(Double result) {
         this.result = result;
     }

     public Classes getClasses() {
         return classes;
     }

     public void setClasses(Classes classes) {
         this.classes = classes;
     }

     @Override
     public String toString() {
         return "Student{" +
                 "sid=" + sid +
                 ", sname='" + sname + '\'' +
                 ", password='" + password + '\'' +
                 ", subject='" + subject + '\'' +
                 ", result=" + result +
                 ", classes=" + classes +
                 '}';
     }
 }

Student.java

6、在mapper包下创建ClassesMapper.java

 package cn.kgc.mapper;

 import cn.kgc.pojo.Classes;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public interface ClassesMapper {
     List<Classes> selectClasses();
 }

ClassesMapper.java

7、在mapper包下创建StudentMapper.java

 package cn.kgc.mapper;

 import cn.kgc.pojo.Student;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public interface StudentMapper {
     List<Student> selectStudent(Student student);
 }

StudentMapper.java

8、在resources文件夹下的mapper文件夹下创建ClassesMapper.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE mapper
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="cn.kgc.mapper.ClassesMapper">
     <select id="selectClasses" resultType="Classes">
         select * from classes
     </select>
 </mapper>

ClassesMapper.xml

9、在resources文件夹下的mapper文件夹下创建StudentMapper.xml

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE mapper
         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="cn.kgc.mapper.StudentMapper">
     <select id="selectStudent" resultMap="studentMap">
         select s.*,c.cname from student s,classes c where s.cid=c.cid
         <if test="classes!=null and classes.cid!=-1">
              and c.cid=#{classes.cid}
         </if>
     </select>
     <resultMap id="studentMap" type="Student">
         <id property="sid" column="SID"/>
         <result property="sname" column="SNAME"/>
         <result property="password" column="PASSWORD"/>
         <result property="subject" column="SUBJECT"/>
         <result property="result" column="RESULT"/>
         <!--
         <association property="classes" javaType="Classes">
             <result property="cid" column="CID"/>
             <result property="cname" column="CNAME"/>
         </association>
         -->
         <association property="classes" javaType="Classes" resultMap="classesMap"/>
     </resultMap>
     <resultMap id="classesMap" type="Classes">
         <id property="cid" column="CID"/>
         <result property="cname" column="CNAME"/>
     </resultMap>

 </mapper>

StudentMapper.xml

10、在java文件夹下的cn.kgc.service路径下创建ClassesService.java文件

 package cn.kgc.service;

 import cn.kgc.pojo.Classes;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public interface ClassesService {
     List<Classes> showOption();
 }

ClassesService.java

11、在java文件夹下的cn.kgc.service路径下创建ClassesServiceImpl.java文件

 package cn.kgc.service;

 import cn.kgc.mapper.ClassesMapper;
 import cn.kgc.pojo.Classes;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 @Service
 @Transactional
 public class ClassesServiceImpl implements ClassesService{
     @Autowired
     private ClassesMapper classesMapper;
     @Override
     public List<Classes> showOption() {
         return classesMapper.selectClasses();
     }
 }

ClassesServiceImpl.java

12、在java文件夹下的cn.kgc.service路径下创建StudentService.java文件

 package cn.kgc.service;
 import cn.kgc.pojo.Student;
 import com.github.pagehelper.PageInfo;
 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 public interface StudentService {
     List<Student> showData(Student student);
     //插件做分页数据查询（查询所有和条件查询）
     PageInfo<Student> showPageData(Integer pageno,Integer pagesize,Student student);
 }

StudentService.java

13、在java文件夹下的cn.kgc.service路径下创建StudentServiceImpl.java文件

 package cn.kgc.service;

 import cn.kgc.mapper.StudentMapper;
 import cn.kgc.pojo.Student;
 import com.github.pagehelper.Page;
 import com.github.pagehelper.PageHelper;
 import com.github.pagehelper.PageInfo;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 @Service
 @Transactional
 public class StudentServiceImpl implements StudentService{
     @Autowired
     private StudentMapper studentMapper;
     @Override
     public List<Student> showData(Student student) {
         return studentMapper.selectStudent(student);
     }

     //分页查询
     @Override
     public PageInfo<Student> showPageData(Integer pageno, Integer pagesize, Student student) {
         //创建分页工具类
         Page pageutil= PageHelper.startPage(pageno,pagesize);
         //将要进行分页的数据先做查询所以
         studentMapper.selectStudent(student);
         return new PageInfo<Student>(pageutil);
     }
 }

StudentServiceImpl.java

14.在java文件夹下的cn.kgc.controller路径下创建CenterController.java文件

 package cn.kgc.controller;
 import cn.kgc.pojo.Classes;
 import cn.kgc.pojo.Student;
 import cn.kgc.service.ClassesService;
 import cn.kgc.service.StudentService;
 import com.github.pagehelper.PageInfo;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;

 import java.util.List;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 @RestController
 public class CenterController{
     @Autowired
     private ClassesService classesService;

     @Autowired
     private StudentService studentService;

     @RequestMapping("/option.do")
     public List<Classes> getOptionData(){
          return classesService.showOption();
     }

     @RequestMapping("/getData.do")
     public List<Student> getStudentData(Integer cid){

         return studentService.showData(new Student(new Classes(cid,null)));
     }
    //插件分页查询
     @RequestMapping("/getPageData.do")
     public PageInfo<Student> findPageData(Integer cid,Integer pageno){
         Integer pagesize=3;
         Student student=new Student(new Classes(cid,null));
         return studentService.showPageData(pageno,pagesize,student);
     }
 }

CenterController.java

15.编辑java文件夹下的cn.kgc路径下的SpringbootmybatisApplication.java文件

 package cn.kgc;

 import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 /**
  * @author:南京课工场大数据学院 Holly老师
  * QQ/微信:864918306
  * Created by Holly on 2019/4/2.
  */
 @SpringBootApplication
 @MapperScan("cn.kgc.mapper")
 public class SpringbootmybatisApplication {

     public static void main(String[] args) {
         SpringApplication.run(SpringbootmybatisApplication.class, args);
     }

 }

SpringbootmybatisApplication.java

16.编辑resources文件夹下的application.properties文件

#端口号
server.port=9090

#数据源的配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/kgc
spring.datasource.username=root
spring.datasource.password=ok

#给某个包下的类的全路径生成别名
mybatis.type-aliases-package=cn.kgc.pojo

#注册映射xml文件
mybatis.mapper-locations=classpath:mapper/*.xml

application.properties

17.在resources文件夹下的static文件夹下创建index.html文件

 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <title>Title</title>
 </head>
 <body>
    <center>
        <h1>学员管理系统</h1>
        <form id="claConditon">
            <p>
                班级:
                <select name="cid">
                    <option value="-1">--请选择--</option>
                </select>
                <input type="button" value="提交"/>
            </p>
        </form>
        <table>
            <tr>
                <td>学号</td>
                <td>班级</td>
                <td>姓名</td>
                <td>科目</td>
                <td>成绩</td>
            </tr>
        </table>
        <p id="pageroot"></p>
    </center>
    <script type="text/javascript" src="js/jquery-3.1.1.js"></script>
    <script type="text/javascript" src="js/index.js"></script>
 </body>
 </html>

index.html

18.在resources文件夹下的static文件夹下创建js文件夹，并在该文件夹下添加jquery-3.1.1.js文件

19.在resources文件夹下的static文件夹下创建js文件夹，并在该文件夹下创建index.js文件

 $(function () {
     //下拉菜单
     getOptionData();
     //初始化数据
     // initData();
     //分页初始化数据
      initPageData(1);

     //条件查询
     $("[type=button]").click(function () {
         initPageData(1);
     });
 });

 //分页初始化数据
 function initPageData(pageno){
     var cid=$("[name=cid]").val();
     $.ajax({
         url:"getPageData.do",
         type:"post",
         dataType:"json",
         data:{"cid":cid,"pageno":pageno},
         async:true,
         success:function (obj) {
             console.log(obj);
             $("tr:not(tr:first)").remove();
             var str="";
             $.each(obj.list,function (i) {
                 str+="<tr>";
                 str+="<td>"+obj.list[i].sid+"</td>";
                 str+="<td>"+obj.list[i].classes.cname+"</td>";
                 str+="<td>"+obj.list[i].sname+"</td>";
                 str+="<td>"+obj.list[i].subject+"</td>";
                 str+="<td>"+obj.list[i].result+"</td>";
                 str+="</tr>";
             });
             $("table").append(str);

             $("#pageroot").html(" ");
             var pagestr="第"+obj.pageNum+"/"+obj.pages+"页&nbsp;";
             if(obj.pageNum>1){
                 pagestr+="<a href='javascrpt:void(0);' onclick='initPageData("+obj.firstPage+")'>首页</a>&nbsp;";
                 pagestr+="<a href='javascrpt:void(0);' onclick='initPageData("+obj.prePage+")'>上一页</a>&nbsp;";
             }
             if(obj.pageNum<obj.pages){
                 pagestr+="<a href='javascrpt:void(0);' onclick='initPageData("+obj.nextPage+")'>下一页</a>&nbsp;";
                 pagestr+="<a href='javascrpt:void(0);' onclick='initPageData("+obj.lastPage+")'>末页</a>&nbsp;";
             }

             pagestr+="共"+obj.total+"条&nbsp;";
             $("#pageroot").append(pagestr);
         },
         error:function () {
             alert("initPageData error");
         }
     });
 }

 //初始化数据
 function initData(){
     var cid=$("[name=cid]").val();
     $.ajax({
         url:"getData.do",
         type:"post",
         dataType:"json",
         data:{"cid":cid},
         async:true,
         success:function (obj) {
             console.log(obj);
             $("tr:not(tr:first)").remove();
             var str="";
             $.each(obj,function (i) {
                  str+="<tr>";
                  str+="<td>"+obj[i].sid+"</td>";
                  str+="<td>"+obj[i].classes.cname+"</td>";
                  str+="<td>"+obj[i].sname+"</td>";
                  str+="<td>"+obj[i].subject+"</td>";
                  str+="<td>"+obj[i].result+"</td>";
                  str+="</tr>";
             });
             $("table").append(str);
         },
         error:function () {
             alert("initData error");
         }
     });
 }
 //下拉菜单
 function getOptionData() {
   $.ajax({
       url:"option.do",
       type:"post",
       dataType:"json",
       data:{},
       async:true,
       success:function (obj) {
           var str="";
           $.each(obj,function (i) {
              str+="<option value='"+obj[i].cid+"'>"+obj[i].cname+"</option>";
           });
          $("select").append(str);
       },
       error:function () {
           alert("getOptionData error");
       }
   });
 }

index.js

20.运行SpringbootmybatisApplication文件，

21.浏览器运行

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