目录
SpringBoot是什么?
Spring Boot它本身并不提供Spring框架的核心特性以及扩展功能,只是用于快速、敏捷地开发新一代基于Spring框架的应用程序。
也就是说,它并不是用来替代Spring的解决方案,而是和Spring框架紧密结合用于提升Spring开发者体验的工具同时它集成了大量常用的第三方库配置(例如Jackson, JDBC, Mongo, Redis, Mail等等),
Spring Boot应用中这些第三方库几乎可以零配置的开箱即用(out-of-the-box),大部分的Spring Boot应用都
只需要非常少量的配置代码,开发者能够更加专注于业务逻辑
注1:敏捷式开发
注2:spring boot其实不是什么新的框架,它默认配置了很多框架的使用方式, 就像maven整合了所有的jar包,spring boot整合了所有的框架
注3:基于Spring框架的一站式解决方案
注意:创建SpringBoot项目时一定要确保有网络

可以换源:

开发工具选择Lombok主键

勾选Spring Web即可

测试SpringBoot是否能正常使用
创建一个demo
IndexController:
- package com.xbb.springboot01.demo;
-
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RestController;
-
- /**
- * @author冰冰
- * @create 2022-11-04 14:25
- */
-
- @RestController
- public class IndexController {
- @RequestMapping("/")
- public String index(){
- System.out.println("come in");
- return "index";
- }
- }
注意:springboot项目不要配置tomcat它有内置的服务器!!

运行结果:

1.特点:敏捷式开发,开箱即用,基于Spring的一站式解决方案。
2.SpringBoot的目录结构
src
main
java
reseurce
static(放静态资源)
template(模板引擎,相对于maven项目中的webapp;Spring默认是不支持jsp的)
application.propertis(Sptring中一个唯二的配置文件)
test

3.下载properties与yml的文件装换插件
Convert YAML and Properties File

注意:下载完成插件要重启IDEA


创建一个测试类模拟数据
- package com.jwj.springboot01.dmeo;
-
- import lombok.AllArgsConstructor;
- import lombok.Data;
- import org.springframework.web.bind.annotation.*;
-
- import java.util.Arrays;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
-
- /**
- * @author冰冰
- * @create 2022-11-04 15:43
- */
- @RestController
- @RequestMapping("/book")
- public class BookController {
-
- @RequestMapping("/list")
- public Map list(){
- // 查询数据库
- List
books = Arrays.asList(new Book(1, "西游记"), - new Book(2, "红楼梦"),
- new Book(3, "水浒传"),
- new Book(4, "三国演义"));
- Map map = new HashMap();
- map.put("data",books);
- map.put("total",122);
- map.put("msg","查询成功");
- map.put("code",200);
- return map;
- }
-
- @RequestMapping("/add")
- public Map add(){
- Map map = new HashMap();
- map.put("msg","新增成功");
- map.put("code",200);
- return map;
- }
-
- @RequestMapping("/update")
- public Map update(){
- Map map = new HashMap();
- map.put("msg","修改成功");
- map.put("code",200);
- return map;
- }
-
- @RequestMapping("/del")
- public Map del(){
- Map map = new HashMap();
- map.put("msg","删除成功");
- map.put("code",200);
- return map;
- }
-
- @RequestMapping("/load")
- public Map load(){
- Map map = new HashMap();
- map.put("data",new Book(1,"西游记"));
- map.put("msg","删除成功");
- map.put("code",200);
- return map;
- }
-
- }
-
- @AllArgsConstructor
- //lombok组件代表的是set、get、ToString方法都不用写了,这是它的作用
- @Data
- class Book{
- private int id;
- private String name;
- }
运行结果:

修改注解
会报错的!!




eolink的使用:更细粒度的调试后台数据接口
Result:
- package com.xbb.springboot01.result;
-
- /**
- * @author冰冰
- * @create 2022-11-04 23:00
- */
-
- public class Result
{ -
- private int code;
- private String msg;
- //因为返回的数据不知道是什么类型,所以定义一个泛型
- private T data;
- private long total;
-
- public long getTotal() {
- return total;
- }
-
- public void setTotal(long total) {
- this.total = total;
- }
-
- /**
- * 成功的时候调用
- */
- public static
Result ok(T data) { - return new Result
(data); - }
- public static
Result ok(int code,String msg) { - return new Result<>(code,msg);
- }
- public static
Result ok(int code,String msg,T data) { - Result
success = ok(data); - success.setCode(code);
- success.setMsg(msg);
- return success;
- }
- public static
Result ok(int code,String msg,T data,long total) { - Result
success = ok(code,msg,data); - success.setTotal(total);
- return success;
- }
-
- /**
- * 失败的时候调用
- */
- public static
Result error(CodeMsg codeMsg) { - return new Result
(codeMsg); - }
-
- private Result(T data) {
- this.data = data;
- }
-
- private Result(int code, String msg) {
- this.code = code;
- this.msg = msg;
- }
-
- private Result(CodeMsg codeMsg) {
- if (codeMsg != null) {
- this.code = codeMsg.getCode();
- this.msg = codeMsg.getMsg();
- }
- }
-
- 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 T getData() {
- return data;
- }
-
- public void setData(T data) {
- this.data = data;
- }
- }
-
CodeMsg.java
- package com.xbb.springboot01.result;
-
- /**
- * @author冰冰
- * @create 2022-11-04 22:16
- */
- public class CodeMsg {
-
- private int code;
- private String msg;
-
- //通用的错误码
- public static CodeMsg SUCCESS = new CodeMsg(200, "success");
- public static CodeMsg SERVER_ERROR = new CodeMsg(500, "服务端异常");
- public static CodeMsg BIND_ERROR = new CodeMsg(500101, "参数校验异常:%s");
- public static CodeMsg REQUEST_ILLEGAL = new CodeMsg(500102, "请求非法");
- public static CodeMsg ACCESS_LIMIT_REACHED = new CodeMsg(500104, "访问太频繁!");
- //登录模块5002XX
- public static CodeMsg SESSION_ERROR = new CodeMsg(500210, "Session不存在或者已经失效");
- public static CodeMsg PASSWORD_EMPTY = new CodeMsg(500211, "登录密码不能为空");
- public static CodeMsg MOBILE_EMPTY = new CodeMsg(500212, "手机号不能为空");
- public static CodeMsg MOBILE_ERROR = new CodeMsg(500213, "手机号格式错误");
- public static CodeMsg MOBILE_NOT_EXIST = new CodeMsg(500214, "手机号不存在");
- public static CodeMsg PASSWORD_ERROR = new CodeMsg(500215, "密码错误");
-
- //商品模块5003XX
-
- //订单模块5004XX
- public static CodeMsg ORDER_NOT_EXIST = new CodeMsg(500400, "订单不存在");
-
- //秒杀模块5005XX
- public static CodeMsg MIAO_SHA_OVER = new CodeMsg(500500, "商品已经秒杀完毕");
- public static CodeMsg REPEATE_MIAOSHA = new CodeMsg(500501, "不能重复秒杀");
- public static CodeMsg MIAOSHA_FAIL = new CodeMsg(500502, "秒杀失败");
-
- private CodeMsg() {
- }
-
- private CodeMsg(int code, String msg) {
- this.code = code;
- this.msg = msg;
- }
-
- 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 CodeMsg fillArgs(Object... args) {
- int code = this.code;
- String message = String.format(this.msg, args);
- return new CodeMsg(code, message);
- }
-
- @Override
- public String toString() {
- return "CodeMsg [code=" + code + ", msg=" + msg + "]";
- }
- }
-
BookController2
- package com.xbb.springboot01.demo;
-
- import com.xbb.springboot01.result.CodeMsg;
- import com.xbb.springboot01.result.Result;
- import lombok.AllArgsConstructor;
- import lombok.Data;
- import org.springframework.web.bind.annotation.*;
-
- import java.util.Arrays;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
-
- /**
- * @author冰冰
- * @create 2022-11-04 23:50
- */
- @RestController
- @RequestMapping("/book2")
- public class BookController2 {
- @GetMapping("/list")
- public Result list(){
- // 查询数据库
- List
books = Arrays.asList(new Book(1, "西游记"), - new Book(2, "三国演义"),
- new Book(3, "水浒传"),
- new Book(4, "红楼梦"));
- return Result.ok(200,"查询成功",books,222);
- }
-
- @PutMapping("/add")
- public Result add(Book book){
- System.out.println(book);
- int id = book.getId();
- if(id == 0){
- Map map = new HashMap();
- map.put("msg","name未传递");
- // return Result.error(CodeMsg.BIND_ERROR.fillArgs("id未传递"));
- }
- return Result.ok(200,"新增成功");
- }
-
- @PostMapping("/update")
- public Result update(){
- return Result.ok(200,"修改成功");
- }
-
- @DeleteMapping("/delete")
- public Result delete(int bid){
- System.out.println(bid);
- return Result.ok(200,"删除成功");
- }
-
- @RequestMapping("/load")
- public Result load(){
- return Result.ok(200,"加载成功",new Book(5,"aaa"));
- }
- }
-
-