SpringBoot:入门简单使用

于 2022-10-31 17:23:54 发布
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分类专栏： spring boot 文章标签： spring boot spring java
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本文链接：https://blog.youkuaiyun.com/weixin_62735525/article/details/127618679
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目录

一、SpringBoot的简介

二、简单使用

创建springboot项目

 使用Java代码

 使用springboot写增删改查

 优化：使用响应封装类

一、SpringBoot的简介

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

 注意：

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

二、简单使用

使用idea新建一个springboot的项目

创建springboot项目

 

 

 

 

 到这里就新建成功了

需要注意的是：在创建该项目时 勾选开发工具不能全勾 或者没有计划的配置却勾选 会报错

 使用Java代码

测试一下 是否能用

创建成功后的项目便有一个Spring01Application 类

package com.cdl.spring01;

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

@SpringBootApplication()
public class Spring01Application {

public static void main(String[] args) {
        SpringApplication.run(Spring01Application.class, args);
        }

        }

 自己写一个controller

package com.cdl.spring01.demo;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author cdl
 * @site www.cdl.com
 * @create 2022-10-28 19:23
 */
//RestController = @responseBody + @controller
@RestController
public class IndexController {
    @RequestMapping("/")
    public String index(){
        System.out.println("com in");
        //index的字符串
        return "index";
    }





}

 

 springboot有内置的tomcat

 能够正常使用

 修改配置

 再运行

 下载所需要的插件

 右键选中修改配置的那个文件 转换一下格式

 转换格式之后

 使用springboot写增删改查

package com.cdl.spring01.demo;

import jdk.nashorn.internal.objects.annotations.Constructor;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author cdl
 * @site www.cdl.com
 * @create 2022-10-28 19:56
 */
@RestController
@RequestMapping("/book")
public class BookController {
    @RequestMapping("/list")
//    @GetMapping("list")
    public Map list(){
        Map map = new HashMap();
        map.put("data", Arrays.asList(
                new Book(1,"足球"),
                new Book(2,"篮球"),
                new Book(3,"排球"),
                new Book(4,"羽毛球"),
                new Book(5,"台球")
        ));
        map.put("total",168);
        map.put("msg","查询成功");
        map.put("code",200);
        return map;
    }

    @RequestMapping("/add")
//    @PutMapping("/add")
    public Map add(){
        Map map = new HashMap();
        map.put("msg","新增成功");
        map.put("code",200);
        return map;
    }

    @RequestMapping("/load")
    public Map load(){
        Map map = new HashMap();
        map.put("msg","加载成功");
        map.put("data",new Book(3,"排球"));
        map.put("code",200);
        return map;
    }


    @RequestMapping("/edit")
//    @PostMapping("/edit")
    public Map edit(){
        Map map = new HashMap();
        map.put("msg","修改成功");
        map.put("code",200);
        return map;
    }

    @RequestMapping("/delete")
//    @DeleteMapping("/delete")
    public Map delete(){
        Map map = new HashMap();
        map.put("msg","删除成功");
        map.put("code",200);
        return map;
    }
}

//构造器
//@Constructor
@AllArgsConstructor
@Data
class Book{
    private int id;
    private String name;

}

增加

 修改

 删除

 查询

 将方法注释换成

package com.cdl.spring01.demo;

import jdk.nashorn.internal.objects.annotations.Constructor;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author cdl
 * @site www.cdl.com
 * @create 2022-10-28 19:56
 */
@RestController
@RequestMapping("/book")
public class BookController {
     @RequestMapping("/list")
   //@GetMapping("list")
    public Map list(){
        Map map = new HashMap();
        map.put("data", Arrays.asList(
                new Book(1,"足球"),
                new Book(2,"篮球"),
                new Book(3,"排球"),
                new Book(4,"羽毛球"),
                new Book(5,"台球")
        ));
        map.put("total",168);
        map.put("msg","查询成功");
        map.put("code",200);
        return map;
    }

    @RequestMapping("/add")
//    @PutMapping("/add")
    public Map add(){
        Map map = new HashMap();
        map.put("msg","新增成功");
        map.put("code",200);
        return map;
    }

    @RequestMapping("/load")
    public Map load(){
        Map map = new HashMap();
        map.put("msg","加载成功");
        map.put("data",new Book(3,"排球"));
        map.put("code",200);
        return map;
    }


    @RequestMapping("/edit")
//    @PostMapping("/edit")
    public Map edit(){
        Map map = new HashMap();
        map.put("msg","修改成功");
        map.put("code",200);
        return map;
    }

    // @RequestMapping("/delete")
   @DeleteMapping("/delete")
    public Map delete(){
        Map map = new HashMap();
        map.put("msg","删除成功");
        map.put("code",200);
        return map;
    }
}

//构造器
//@Constructor
@AllArgsConstructor
@Data
class Book{
    private int id;
    private String name;

}

 

 优化：使用响应封装类

新建一个result的包

放入错误编码类

package com.cdl.spring01.Result;

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 + "]";
    }
}

统一响应类

package com.cdl.spring01.Result;

public class Result<T> {
 
    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 <T> Result<T> ok(T data) {
        return new Result<T>(data);
    }
    public static <T> Result<T> ok(int code,String msg) {
        return new Result<>(code,msg);
    }
    public static <T> Result<T> ok(int code,String msg,T data) {
        Result<T> success = ok(data);
        success.setCode(code);
        success.setMsg(msg);
        return success;
    }
    public static <T> Result<T> ok(int code,String msg,T data,long total) {
        Result<T> success = ok(code,msg,data);
        success.setTotal(total);
        return success;
    }
 
    /**
     * 失败的时候调用
     */
    public static <T> Result<T> error(CodeMsg codeMsg) {
        return new Result<T>(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;
    }
}

controller

package com.cdl.spring01.demo;

import com.cdl.spring01.Result.CodeMsg;
import com.cdl.spring01.Result.Result;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author cdl
 * @site www.cdl.com
 * @create 2022-10-28 19:56
 */
@RestController
@RequestMapping("/book2")
public class BookController02 {
//    @RequestMapping("/list")
    @GetMapping("list")
    public Result list(){
        return Result.ok(200,"查询成功",
                Arrays.asList(
                        new Book(1,"足球"),
                        new Book(2,"篮球"),
                        new Book(3,"排球"),
                        new Book(4,"羽毛球"),
                        new Book(5,"台球")
                ),168);
    }

//    @RequestMapping("/add")
      @PutMapping("/add")
    public Result add(){
        return Result.ok(200,"新增成功");
    }

    @RequestMapping("/load")
    public Result load(){
        return Result.ok(200,"加载成功",new Book(3,"排球"));
    }


//    @RequestMapping("/edit")
      @PostMapping("/edit")
    public Result edit(){
        return Result.ok(200,"修改成功");
    }

//    @RequestMapping("/delete")
      @DeleteMapping("/delete")
    public Result delete(){
        return Result.ok(200,"删除成功");
    }

    @RequestMapping("/queryByUser")
    public Result queryByUser(){
        return Result.error(CodeMsg.BIND_ERROR.fillArgs("密码等级太低"));
    }
}

使用测试工具postman测试结果

查询

 新增

 修改

 删除

 

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