我的第一个SpringBoot小Demo（简单的学生管理系统）
1.使用idea搭建SpringBoot环境
写第一个springboot例子之前 确保所要用到的工具都安装好 jdk，maven，idea，mysql，我的第一个学生成绩管理系统小demo使用的是前后端分离，所用到的技术有前端框架layui框架，ajax请求，实现分页。
1. 选择create new project
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第一个springboot小例子已经跑起来了
后台源码
第一个学生管理系统demo
1.配置application.properties文件 里面有数据源配置和jpa jpa可以帮我们自动生成表结构 上下文配置指定了访问路径
#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
#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
#上下文配置
server.port=8888
server.servlet.context-path=/stu
2.配置pom.xml文件，pom.xml文件配置一些我们所使用到的jar包
com.github.pagehelper
pagehelper-spring-boot-starter
1.2.10
com.alibaba
druid
1.1.10
org.springframework.boot
spring-boot-starter-data-jpa
3.在数据库里创建表
4.在idea中entity包下创建实体类Student，注意：Student中的属性和字段要与数据库中的一一对应,编写规范加上注解，并说明id是自增类型
@Entity
@Table(name = "student")
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private int age;
private String sex;
5.Dao层，创建接口StudentDao并继承JpaRespository，JpaRespository里面有别人已经为我们定义好的一些简单的CRUD方法。
public interface StudentDao extends JpaRepository {
Student findStudentById(Integer id);
@Query(name = "findStuByName",nativeQuery = true,value =
"select * from student where name=:name")
List findStuByName(@Param("name") String name);
}
6.用户Dao层开发，创建接口UserDao并继承JpaRespository，JpaRespository里面有别人已经为我们定义好的一些简单的CRUD方法。
public interface UserDao extends JpaRepository {
/**
* 根据id查询
*/
User findUserById(Integer id);
@Query(name="login",nativeQuery = true,value = "select * from user where username=:username and password=:password")
User login(@Param("username") String username,@Param("password") String password);
void deleteById(Integer id);
7.StudentService层
public interface StudentService {
Student save(Student student);
Student update(Student student);
void delete(Integer id);
Student findStuById(Integer id);
List findStuByName(String name);
/**
* 分页查询所有数据
* @param page 当前页
* @param pageSize 每页记录数
* @return
*/
Page findAll(int page,int pageSize);
}
8.StudentService层的实现类
@Service
public class StudentServiceimpl implements StudentService {
@Autowired
private StudentDao studentDao ;
@Override
public Student save(Student student) {
return studentDao.save(student);
}
@Override
public Student update(Student student) {
return studentDao.save(student);
}
@Override
public void delete(Integer id) {
studentDao.deleteById(id);
}
@Override
public Student findStuById(Integer id) {
return studentDao.findStudentById(id);
}
@Override
public List findStuByName(String name) {
return studentDao.findStuByName(name);
}
@Override
public Page findAll(int page, int pageSize) {
Pageable pageable= PageRequest.of(page,pageSize);
return studentDao.findAll(pageable);
}
9.UserService层
public interface UserService {
List findAll();
User findUserById(Integer id);
User save(User user);
User update(User user);
void delete(int id);
User login(String username,String password);
void deleteById(Integer id);
}
10.UserServiceimpl
package com.kude.stu.stuproject.stu.service;
import com.kude.stu.stuproject.stu.dao.UserDao;
import com.kude.stu.stuproject.stu.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceimpl implements UserService {
@Autowired
private UserDao userdao;
@Override
public List findAll() {
return userdao.findAll();
}
@Override
public User findUserById(Integer id) {
return userdao.findUserById(id);
}
@Override
public User save(User user) {
return userdao.save(user);
}
@Override
public User update(User user) {
return null;
}
@Override
public void delete(int id) {
}
@Override
public User login(String username, String password) {
return userdao.login(username,password);
}
@Override
public void deleteById(Integer id) {
userdao.deleteById(id);
}
}
11.因为用到ajax请求和layui框架，需要封装LayData，LoginMsg
package com.kude.stu.stuproject.stu.entity;
import java.util.List;
public class LayData{
private int code;
private String msg;
private long count;
private List data;
public LayData(){
}
public LayData(int code, String msg, long count, List data) {
this.code = code;
this.msg = msg;
this.count = count;
this.data = data;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public long getCount() {
return count;
}
public void setCount(long count) {
this.count = count;
}
public List getData() {
return data;
}
public void setData(List data) {
this.data = data;
}
@Override
public String toString() {
return "LayData{" +
"code=" + code +
", msg='" + msg + '\'' +
", count=" + count +
", data=" + data +
'}';
}
}
package com.kude.stu.stuproject.stu.entity;
public class LoginMsg {
private int code;
private User result;
public LoginMsg(){
}
@Override
public String toString() {
return "LoginMsg{" +
"code=" + code +
", result=" + result +
'}';
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public User getResult() {
return result;
}
public void setResult(User result) {
this.result = result;
}
public LoginMsg(int code, User result) {
this.code = code;
this.result = result;
}
}
12.UserController层
/**
* 处理用户信息的控制层
* @author 石光辉
*/
@RestController
@RequestMapping("/user")
public class UserController {
/**
* 查询用户的方法
*/
@Autowired
private UserService userService;
@RequestMapping("/findAll")
public List findAll(){
return userService.findAll();
}
/**
* 根据id查询用户
*/
@RequestMapping("/query")
public User findById(int id){
return userService.findUserById(id);
}
/**
* 注册用户
*/
@RequestMapping(value = "/reg",method = RequestMethod.POST)
public LoginMsg regUser(User user,HttpServletResponse response){
response.setHeader("Access-Control-Allow-Origin","*");
// userService.save(user);
LoginMsg lm=new LoginMsg();
// String name=user.getUsername();
// String word=user.getPassword();
if (user==null) {
lm.setCode(0);
lm.setResult(null);
}else{
userService.save(user);
lm.setCode(1);
lm.setResult(user);
}
return lm;
}
/**
* 用户登录
*/
@PostMapping("/login")
public LoginMsg login(String username, String password, String isLogin, HttpServletResponse response, HttpSession session){
response.setHeader("Access-Control-Allow-Origin","*");
// return userService.login(username, password);
User user=userService.login(username,password);
LoginMsg lm=new LoginMsg();
if (user!=null){
lm.setCode(1);
lm.setResult(user);
session.setAttribute("user",user);
}else {
lm.setCode(0);
lm.setResult(null);
}
// 记住密码
if(Boolean.valueOf(isLogin)){
Cookie nameCookie=new Cookie("username",username);
nameCookie.setMaxAge(60*60*24*7);
Cookie pwdCookie=new Cookie("password",password);
pwdCookie.setMaxAge(60*60*24*7);
response.addCookie(nameCookie);
response.addCookie(pwdCookie);
}else{
}
return lm;
}
@PostMapping("/isLogin")
public String isLogin(HttpSession session,HttpServletResponse response){
response.setHeader("Access-Control-Allow-Origin","*");
User user= (User) session.getAttribute("user");
if(user==null){
return "0";
}
else{
return "1";
}
}
@PostMapping("exit")
public String exit(HttpSession session, HttpServletResponse response){
response.setHeader("Access-Control-Allow-Origin","*");
session.removeAttribute("user");
System.out.println("退出成功！");
return "退出成功";
}
@RequestMapping(value = "/delete",method = RequestMethod.POST)
public void deleteById(Integer id){
userService.deleteById(id);
}
}
11.Studentcontroller层，在编写分页功能时，一定要注意Page所在的包是import org.springframework.data.domain.Page，不是其他的包，如果包导错了，就会出现错误。
@RestController
@RequestMapping("/s")
public class StudentController {
@Autowired
private StudentService studentService;
/**
* 添加学生信息
* @param student 添加的学生对象
* @return
*/
@PostMapping("/add")
public Student save(Student student){
return studentService.save(student);
}
public Student queryById(Integer id){
return studentService.findStuById(id);
}
/**
* 修改学生信息
* @param student 要修改的学生对象
* @return
*/
@PostMapping("/update")
public Student update(Student student,HttpServletRequest request){
Student stu=studentService.save(student);
request.setAttribute("student",stu);
return stu;
}
/**
* 删除学生信息
* @param id 参数 id
* @return
*/
@GetMapping("/del/{id}")
public String del(@PathVariable int id){
studentService.delete(id);
return "删除成功！";
}
/**
* 通过姓名查询学生信息
* @param name 参数 学生姓名
* @return
*/
@GetMapping("/findByName/{name}")
public List findByName(@PathVariable String name){
return studentService.findStuByName(name);
}
@GetMapping("/query")
public LayData findByPage(Integer page,Integer limit, HttpServletResponse response){
response.setHeader("Access-Control-Allow-Origin","*");
if(page==null || page<=0){
page = 0;
}else{
page -= 1;
}
if(limit==null||limit<=5){
limit=5;
}
Page pageData=studentService.findAll(page,limit);
LayData layData=new LayData();
layData.setCode(0);
layData.setCount(pageData.getTotalElements());
layData.setData(pageData.getContent());
return layData;
}
}
前端页面
1.前端写代码工具 HBuilder，该工具是轻量级的，启动起来非常快。创建一个普通的项目，该项目的目录结构如下：
2.register.html核心代码
3.login.html核心代码,使用AJAX 通过在后台与服务器进行少量数据交换，使网页实现异步更新
看一下整体的效果吧
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