Spring Boot 结合Spring Data结合小项目（增，删，查，模糊查询，分页，排序）

本次做的小项目是类似于，公司发布招聘信息，因此有俩个表，一个公司表，一个招聘信息表，俩个表是一对多的关系

项目整体结构：

Spring Boot和Spring Data结合的资源文件

application.properties

#项目端口配置
server.port=8080
server.address=0.0.0.0
#Mysql数据源配置
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/sys?characterEncoding=UTF8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

#JPA相关配置
#项目启动生成数据库
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
#josn数据格式
spring.jackson.serialization.indent-output=true

Spring Boot启动类

com.bjsxt.ApplicationRun

package com.bjsxt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

pom文件

<?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>com.bjsxt</groupId>
    <artifactId>spring-boot-data</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.9.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.10.RELEASE</version>
            <scope>compile</scope>
        </dependency>

        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <!-- jasper -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

因为用的是正向工程，先看俩个实体类（一对多的关系）

com.bjsxt.pojo.Company

package com.bjsxt.pojo;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

/**
 * 实体类 公司信息
 */
@Table(name = "company")
@Entity
public class Company {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "cid")
    private int cid;

    @Column(name = "cname")
    private String cname;

    @Column(name = "location")
    private String location;

    @OneToMany(mappedBy = "company",cascade = CascadeType.PERSIST)
    private Set<Position> positions=new HashSet<>();
    public Company(){}

    public Set<Position> getPositions() {
        return positions;
    }

    public void setPositions(Set<Position> positions) {
        this.positions = positions;
    }

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

    public Company(String cname, String location) {
        this.cname = cname;
        this.location = location;
    }

    public int getCid() {
        return cid;
    }

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

    public String getCname() {
        return cname;
    }

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

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }
}

com.bjsxt.pojo.Position

package com.bjsxt.pojo;

import javax.persistence.*;

/**
 * 实体类 公司发布的招聘信息
 */
@Entity
@Table(name = "position")
public class Position {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "pid")
    private int pid;

    @Column(name = "pname")
    private String pname;

    @Column(name = "minsal")
    private double minsal;

    @Column(name = "maxsal")
    private double maxsal;

    @Column(name = "releasedate")
    private String releasedate;

    @ManyToOne(cascade = CascadeType.PERSIST)
    @JoinColumn(name = "cid")
    private Company company;

    public Position(){}

    @Override
    public String toString() {
        return "Position{" +
                "pid=" + pid +
                ", pname='" + pname + '\'' +
                ", minsal=" + minsal +
                ", maxsal=" + maxsal +
                ", releasedate='" + releasedate + '\'' +
                ", company=" + company +
                '}';
    }

    public int getPid() {
        return pid;
    }

    public void setPid(int pid) {
        this.pid = pid;
    }

    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }

    public double getMinsal() {
        return minsal;
    }

    public void setMinsal(double minsal) {
        this.minsal = minsal;
    }

    public double getMaxsal() {
        return maxsal;
    }

    public void setMaxsal(double maxsal) {
        this.maxsal = maxsal;
    }

    public String getReleasedate() {
        return releasedate;
    }

    public void setReleasedate(String releasedate) {
        this.releasedate = releasedate;
    }

    public Company getCompany() {
        return company;
    }

    public void setCompany(Company company) {
        this.company = company;
    }

    public Position(String pname, double minsal, double maxsal, String releasedate, Company company) {
        this.pname = pname;
        this.minsal = minsal;
        this.maxsal = maxsal;
        this.releasedate = releasedate;
        this.company = company;
    }
}

Dao层（俩个接口都继承了JpaRepository<Company,Integer>）

com.bjsxt.dao.CompanyDao

package com.bjsxt.dao;

import com.bjsxt.pojo.Company;
import org.springframework.data.jpa.repository.JpaRepository;

public interface CompanyDao extends JpaRepository<Company,Integer> {
}

com.bjsxt.dao.PositionDao

package com.bjsxt.dao;

import com.bjsxt.pojo.Position;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

public interface PositionDao extends JpaRepository<Position,Integer>, JpaSpecificationExecutor<Position>{

}

service层

由于主要是用来测试boot和data的结合，因此在在对于公司表上面的操作，仅仅就是查询，所以，公司的接口以及实现类只有一种查询所有的方法。

com.bjsxt.service.CompanyService

package com.bjsxt.service;

import com.bjsxt.pojo.Company;

import java.util.List;

public interface CompanyService {
    /**
     * 查询所有的公司信息
     * @return
     */
    public List<Company> findAll();
}

com.bjsxt.service.impl.CompanyServiceImpl

package com.bjsxt.service.impl;

import com.bjsxt.ApplicationRun;
import com.bjsxt.dao.CompanyDao;
import com.bjsxt.pojo.Company;
import com.bjsxt.service.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.test.context.ContextConfiguration;

import java.util.List;

@ContextConfiguration(classes = ApplicationRun.class)
@Service
public class CompanyServiceImpl implements CompanyService {

    @Autowired
    private CompanyDao companyDao;

    /**
     * 查询所有的公司信息
     * @return
     */
    @Override
    public List<Company> findAll() {
        List<Company> company = companyDao.findAll();
        return company;
    }
}

接下来是主要对于招聘信息表的service操作，主要有，查询所有招聘信息，模糊查询招聘信息，这俩种方法因为需要和分页结合在一起，因此在查询的操作上面有一些不同，还有就是发布招聘信息，就是增加，然后就是删除，没有做修改。

com.bjsxt.service.PositionService

package com.bjsxt.service;

import com.bjsxt.pojo.Position;
import javafx.geometry.Pos;
import org.springframework.data.domain.Page;

import java.util.List;

public interface PositionService {
    /**
     * 添加发布信息
     * @param position
     */
    void addPos(Position position);

    /**
     * 查询所有招聘信息
     * @return
     */
    public Page<Position> findAll(Integer pageNum,Integer sizeNum);

    /**
     * 模糊查询
     * @param pname
     * @return
     */
    public Page<Position> findLike(String pname,Integer pageNum,Integer sizeNum);

    /**
     * 删除一条记录
     * @param pid
     */
    public void deleteByid(Integer pid);

}

com.bjsxt.service.impl.PositionServiceImpl

package com.bjsxt.service.impl;

import com.bjsxt.ApplicationRun;
import com.bjsxt.dao.PositionDao;
import com.bjsxt.pojo.Position;
import com.bjsxt.service.PositionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

@Service
@ContextConfiguration(classes = ApplicationRun.class)
public class PositionServiceImpl implements PositionService {

    @Autowired
    private PositionDao positionDao;

    /**
     * 添加招聘信息
     * @param position
     */
    @Override
    public void addPos(Position position) {
        Date now =new Date();
        SimpleDateFormat spdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String releasedate = spdf.format(now);
        position.setReleasedate(releasedate);
        positionDao.save(position);
    }

    /**
     * 查询所有招聘信息
     * @return
     */
    @Override
    public Page<Position> findAll(Integer pageNum,Integer sizeNum) {
        Sort sort=new Sort(Sort.Direction.DESC,"minsal");
        Pageable pageable=new PageRequest(pageNum,sizeNum,sort);
        Page<Position> pos = positionDao.findAll(pageable);
        return pos;
    }

    /**
     * 模糊查询
     * @param pname
     * @return
     */
    @Override
    public Page<Position> findLike(String pname,Integer pageNum,Integer sizeNum) {
        String finalPname = pname;
        Specification<Position> specification=new Specification<Position>() {
            @Override
            public Predicate toPredicate(Root<Position> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                return criteriaBuilder.like(root.get("pname"),"%"+ finalPname +"%");

            }
        };
        Sort sor=new Sort(Sort.Direction.DESC,"minsal");
        Pageable pageable=new PageRequest(pageNum,sizeNum,sor);
        Page<Position> pagepos = positionDao.findAll(specification,pageable);
        return pagepos;
    }

    /**
     * 删除指定的招聘信息
     * @param pid
     */
    @Override
    public void deleteByid(Integer pid) {
        Position position=new Position();
        position.setPid(pid);
        positionDao.delete(position);
    }
}

后面就是控制层，控制层我同样写了俩个类

com.bjsxt.cotroller.CompanyController

package com.bjsxt.cotroller;

import com.bjsxt.pojo.Company;
import com.bjsxt.service.CompanyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
public class CompanyController {
    @Autowired
    private CompanyService cs;

    @RequestMapping("/fabu")
    public String FaBuZhaoPing(Model model){
        List<Company> comList = cs.findAll();
        model.addAttribute("company",comList);
        return "fabu.jsp";
    }
}

com.bjsxt.cotroller.PositionController

package com.bjsxt.cotroller;

import com.bjsxt.pojo.Position;
import com.bjsxt.service.PositionService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@Controller
public class PositionController {

    @Autowired
    private PositionService positionService;

    /**
     * 添加招聘信息
     * @param position
     * @return
     */
    @RequestMapping("/addPos")
    public String addPos(Position position){
        positionService.addPos(position);
        return "/findall";
    }

    /**
     * 查询所有
     * @param model
     * @return
     */
    @RequestMapping("/findall")
    public String findPosAll(Model model,@RequestParam(defaultValue = "0")Integer pageNum,
                             @RequestParam(defaultValue = "3")Integer sizeNum){
        Page<Position> page = positionService.findAll(pageNum,sizeNum);
        //总条数
        long elements = page.getTotalElements();

        //总页数
        int pages = page.getTotalPages()-1;

        //记录当前页有多少条数据
        int numberOfElements = page.getNumberOfElements();

        //当前页数
        int number = page.getNumber();

        List<Position> posList = page.getContent();
        model.addAttribute("pos",posList);
        model.addAttribute("pages",pages);
        model.addAttribute("elements",elements);
        model.addAttribute("numberOfElements",numberOfElements);
        model.addAttribute("number",number);
        return "index.jsp";
    }

    /**
     * 模糊查询
     * @param pname
     * @param model
     * @return
     */
    @RequestMapping("/findlike")
    public String findLike(String pname,@RequestParam(defaultValue = "0")Integer pageNum,
                           @RequestParam(defaultValue = "3")Integer sizeNum,Model model){
        Page<Position> pagePos;
        if (pname!=""){
            pagePos =positionService.findLike(pname,pageNum,sizeNum);
        }else {
            pagePos=positionService.findAll(pageNum,sizeNum);
        }
        List<Position> posList = pagePos.getContent();
        int pages = pagePos.getTotalPages()-1;
        long elements = pagePos.getTotalElements();
        int numberOfElements = pagePos.getNumberOfElements();
        int number = pagePos.getNumber();
        model.addAttribute("pages",pages);
        model.addAttribute("elements",elements);
        model.addAttribute("numberOfElements",numberOfElements);
        model.addAttribute("number",number);
        model.addAttribute("pos",posList);
        return "index.jsp";
    }

    /**
     * 删除单一记录
     * @param pid
     * @return
     */
    @RequestMapping("/deleteById")
    public String deleteById(Integer pid){
        positionService.deleteByid(pid);
        return "/findall";
    }
}

俩个前台页面（用的是jsp，没有用thymeleaf，因为自己还不熟悉）

主页面（包含查询的表格，跳转增加招聘信息的连接）

src/main/webapp/index.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/11/16
  Time: 21:05
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>招聘系统企业版</h1>
<hr/>
<form action="/findlike" method="post">
    按照职位:<input type="text" name="pname">&nbsp;
    跳往<input type="number" name="pageNum">&nbsp;
    每页<input type="number" name="sizeNum">条数据&nbsp;
    <input type="submit" value="查询">
</form>

<hr/>
<a href="/fabu">发布新的招聘信息</a>
<hr/>
<table border="1" align="center" width="50%">
    <tr>
        <th>职位名称</th>
        <th>公司名称</th>
        <th>职位月薪</th>
        <th>工作地点</th>
        <th>发布日期</th>
        <th>操作</th>
    </tr>
    <c:forEach items="${pos}" var="pos">
        <tr>
            <th>${pos.pname}</th>
            <th>${pos.company.cname}</th>
            <th>${pos.minsal}--${pos.maxsal}</th>
            <th>${pos.company.location}</th>
            <th>${pos.releasedate}</th>
            <th><a href="/deleteById?pid=${pos.pid}">删除</a></th>
        </tr>
    </c:forEach>
    当前位于${number}页&nbsp;&nbsp;
    当前页有${numberOfElements}条招聘信息&nbsp;&nbsp;
    一共${elements}条招聘信息&nbsp;&nbsp;
    一共${pages}页
</table>
</body>
</html>

发布招聘信息的表单页面

src/main/webapp/fabu.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/11/16
  Time: 22:03
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>发布招聘信息</title>
</head>
<body>
    <h1 align="center">发布招聘信息</h1>
<hr/>
<form method="post" action="/addPos">
    <p>
        职位名称:<input type="text" name="pname">
    </p>
    <p>
        最低薪水:<input type="number" name="minsal">
    </p>
    <p>
        最高薪水:<input type="number" name="maxsal">
    </p>
    <p>
        发布公司:
        <select name="company">
            <option value="0">=请选择=</option>
            <c:forEach items="${company}" var="com">
                <option value="${com.cid}">${com.cname}</option>
            </c:forEach>
        </select>
    </p>
    <p>
        <input type="submit" value="发布">
    </p>
</form>
</body>
</html>

项目成果展示

查询所有数据

从图中可以看出是按照最低薪水从高到低排列

分页显示

发布招聘信息的表单