springboot实现CRUD

准备工作

1.新建数据库stu

2.建立表student

新建一个项目

springboot实现CRUD

1.创建实体类student

package com.kude.stu.kudestu.stu.entity;


import javax.persistence.*;

@Entity/*应用在实体类上*/
@Table(name="student")/*表示对应的表的名字*/
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY) /*应用在实体类上表示id自增*/
    private Integer id;
    private String name;
    private int age;
    private String sex;

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    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 getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Student() {
    }
}

2.DAO层

package com.kude.stu.kudestu.stu.dao;

import com.kude.stu.kudestu.stu.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import java.util.List;

public interface StudentDao extends JpaRepository<Student,Integer> {


Student findStudentById(Integer id);

    /**
     * 自定义查询方法
     * @param name 要查询的名字
     * @return
     */
    @Query(name="findStudentByName",nativeQuery = true,value = "select * from student where name=:name")
List<Student> findStudentByName(@Param("name") String name);

}

3.service层

package com.kude.stu.kudestu.stu.service;

import com.kude.stu.kudestu.stu.dao.StudentDao;
import com.kude.stu.kudestu.stu.entity.Student;
import org.springframework.data.domain.Page;

import java.util.List;

public interface StudentService {

Student save(Student student);/*增加一条学生信息*/
Student update(Student student);/*修改一条学生信息*/
void deleteById(Integer id);/*删除一条学生信息*/
Student findStudentById(Integer id);/*根据id查询一条学生信息*/
List<Student> findStudentByName(String name);/*根据名字查询学生信息*/
Page<Student> findAll(int page,int pageSize);/*分页查询*/

}

service实现层

package com.kude.stu.kudestu.stu.service;


import com.kude.stu.kudestu.stu.dao.StudentDao;
import com.kude.stu.kudestu.stu.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentServiceImpl implements StudentService{

    @Autowired
    private StudentDao studentDao;

    /**
     * 保存一条学生信息
     * @param student
     * @return
     */
    @Override
    public Student save(Student student) {
        return studentDao.save(student);
    }

    @Override
    public Student update(Student student) {
        return studentDao.save(student);

    }

    @Override
    public void deleteById(Integer id) {
studentDao.deleteById(id);
    }

    @Override
    public Student findStudentById(Integer id) {
        return studentDao.findStudentById(id);
    }

    @Override
    public List<Student> findStudentByName(String name) {
        return studentDao.findStudentByName(name);
    }


    /**
     * 分页查询所有
     * @param page 当前页，表示当前要查第几页
     * @param pageSize 每页记录数，表示一页要查几条数据
     * @return
     */
    @Override
    public Page<Student> findAll(int page, int pageSize) {
        Pageable pageable=PageRequest.of(page,pageSize);
        return studentDao.findAll(pageable);
    }
}

控制层

package com.kude.stu.kudestu.stu.controller;


import com.kude.stu.kudestu.stu.entity.Student;
import com.kude.stu.kudestu.stu.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletResponse;
import java.util.List;


/**
 * 处理学生信息的控制层
 * @author lijianyang
 */
@RestController/*控制层，返回值封装成json数据*/
@RequestMapping("/ss")/*请求的映射*/
public class StudentController {

    @Autowired
   private StudentService studentService;


    /**
     * 增加一条学生信息
     * @param student 要添加的学生对象
     * @return
     */
    @RequestMapping("/add")
    public Student save(Student student){
        return studentService.save(student);
    }

    /**
     * 修改一条学生信息
     * @param student  要修改的学生对象
     * @return
     */
    @RequestMapping("/update")
    public Student update(Student student)
    {
        return studentService.save(student);
    }

    /**
     * 根据Id删除一条学生信息
     * @param id 要删除的学生Id
     * @return
     */
    @RequestMapping("/deletebyid/{id}")
    public String deleteById(@PathVariable Integer id)
    {
          studentService.deleteById(id);
          return "yes";
    }

    /**
     * 根据id查询一条学生信息
     * @param id 要查询的学生id
     * @return
     */
    @RequestMapping("/findbyid/{id}")
    public Student findById(@PathVariable Integer id)
    {
        return studentService.findStudentById(id);
    }

    /**
     * 根据名字查询一条学生信息
     * @param name 要查询的学生名字
     * @return
     */
    @RequestMapping("/findbyname")
    public List<Student> findByName(String name)
    {
        return studentService.findStudentByName(name);
    }

    /**
     * 分页查询
     * @param page
     * @param response
     * @return
     */
    @RequestMapping("/findByPage")
    public Page<Student> findByPage(Integer page, HttpServletResponse response)
    {
        response.setHeader("Access-Control-Allow-Origin","*");
        if(page==null||page<=0)
        {
            page=0;
        }else {
            page-=1;
        }
            return studentService.findAll(page,5);
    }
}

properties配置


#数据源配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/stu?useSSL=false&useUnicode=true&characterEncoding=utf-8&autoReconnect=true&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.initialSize=20
spring.datasource.minIdle=50
spring.datasource.maxActive=500

#上下文配置
server.port=8888
server.servlet.context-path=/stu

#配置jpa
#帮我们自动生成表结构
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true
spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true

pom依赖文件

 <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-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
    </dependencies>

前端页面

1.添加学生

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<h1>添加学生</h1>
		<hr>
		<form action="http://localhost:8888/stu/ss/add" method="post">
			<p>
				姓名：<input type="text" name="name">
			</p>
			<p>
				年龄：<input type="text" name="age">
			</p>
			<p>
				性别：
				<input type="radio" name="sex" value="男">男
				<input type="radio" name="sex" value="女" />女
			</p>
			<p>
				<input type="submit" value="保存">
			</p>
		</form>
	</body>
</html>

2.修改学生信息

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<h1>修改学生信息</h1>
			<hr>
			<form action="http://localhost:8888/stu/ss/update" method="post">
				<p>
					 id：<input type="text" name="id">
				</p>
				<p>
					姓名：<input type="text" name="name">
				</p>
				<p>
					年龄：<input type="text" name="age">
				</p>
				<p>
					性别：
					<input type="radio" name="sex" value="男">男
					<input type="radio" name="sex" value="女" />女
				</p>
				
				<p>
						<input type="submit" value="确认修改">
					</p>
				</form>
				
			</form>
		
	</body>
</html>

3.展示页面

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
	<script src="js/jquery.js" type="text/javascript" charset="utf-8"></script>
	<script type="text/javascript">
		var page=1;
	var tp=0;
	$(function(){
		showData();
	});
	
	function upPage()
	{
		if(page>1)
		{
			page--;
		showData();
		}	
	}
	function downPage()
	{
		if(page<tp)
		{
			page++;
		showData();
		}
	}
	function showData()
	{
		$.ajax(
		{
			url:'http://localhost:8888/stu/ss/findByPage?page='+page,
			success:function(result){
				
			var rel=result.content;
			tp=result.totalPages;
			var htmlStr = "<table width='80%' align='center' border='1'>"+
			          "<tr><th>id</th><th>name</th><th>age</th><th>sex</th><th>操作</th></tr>";
			
			
			for(var i=0;i<rel.length;i++){
				var stu=rel[i];
			htmlStr +="<tr><td>"+stu.id+"</td><td>"+stu.name+"</td><td>"+stu.age+"</td><td>"+stu.sex+"</td>"+
			"<td><a href='bianji.html'>修改</a>&nbsp;<a href='http://localhost:8888/stu/ss/deletebyid/"+stu.id+"'>删除</a></td></tr>";
				
			}
			
			htmlStr +="</table>";
			$("#show").html(htmlStr)
			}	
		
		});
		}
	</script>
	
	<h1 style="text-align: center;">学生管理系统</h1>
	<hr>
	<a href="add.html">添加学生</a>
	<div id="show">
		
		
	</div>
	
	<a href="javascript:upPage()">上一页</a>&nbsp;&nbsp;<a href="javascript:downPage()">下一页</a>
	</head>
	<body>
		
	</body>
</html>

展示页面

springboot实现CRUD

修改页面

springboot实现CRUD