springboot入门

Springboot入门

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

Idea配置SpringBoot项目

 

 

java源文件夹中的Springboot01Application.java是整个项目的启动类

static：存放的是静态资源的文件

templetes：存放的项目所需的页面

application.properties里面存放的是项目的全局配置信息

启动Springboot

浏览器访问

测试springboot(案例)

package com.javaxl.springboot01.controller;

import com.javaxl.springboot01.configurationProperties.MysqlEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

/**
 * @author XuFanQi
 * @site
 * @company
 * @create 2019-11-24 15:50
 * RestController = responsebady + conterllor
 */
@RestController
public class HelloController {


    @RequestMapping("/hello01")
    public String hello01(){
        return "Hello springboot ！ ！ ！";
    }

    @RequestMapping("/say1")
    public String say1(String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/say2/{name}")
    public String say2(@PathVariable("name") String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/json")
    public Map returnJson(){
        Map map = new HashMap();
        map.put("success",true);
        map.put("msg","恭喜你中奖了！！！");
        return map;
    }


}

Springboot配置文件

内置属性

注意：实际项目开发的时候Port=80，Context-path=/，以下配置只为讲解相关知识点

 

自定义属性

application.yml

server:
  servlet:
    context-path: /
  port: 80

user:
  uname: zs
  pwd: 123456

HelloController相关代码

/**
 * @author XuFanQi
 * @site
 * @company
 * @create 2019-11-24 15:50
 * RestController = responsebady + conterllor
 */
@RestController
public class HelloController {

    @Value("${user.uname}")
    private String uname;
    @Value("${user.pwd}")
    private String pwd;

    @Autowired
    private MysqlEntity mysqlEntity;

    @RequestMapping("/hello01")
    public String hello01(){
        return "Hello springboot ！ ！ ！";
    }

    @RequestMapping("/say1")
    public String say1(String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/say2/{name}")
    public String say2(@PathVariable("name") String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/json")
    public Map returnJson(){
        Map map = new HashMap();
        map.put("success",true);
        map.put("msg","恭喜你中奖了！！！");
        return map;
    }

    @RequestMapping("/say3")
    public Map say3(){
        Map map = new HashMap();
        map.put("uname",uname);
        map.put("pwd",pwd);
        return map;
    }
}

浏览器访问结果

属性封装类

定义属性封装类

application.yml

server:
  servlet:
    context-path: /
  port: 80

user:
  uname: zs
  pwd: 123456
  age: 18
  sex: "男"
  addr: "北京"

MysqlEntity 

package com.javaxl.springboot01.configurationProperties;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * @author XuFanQi
 * @site
 * @company
 * @create 2019-11-24 16:52
 */
@Component
@Data
@ConfigurationProperties(prefix = "user")
public class MysqlEntity {

    private  String uname;
    private  String pwd;
    private  Integer age;
    private  String sex;
    private  String addr;
}

添加pom依赖，解决报红问题

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

HelloController 

package com.javaxl.springboot01.controller;

import com.javaxl.springboot01.configurationProperties.MysqlEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

/**
 * @author XuFanQi
 * @site
 * @company
 * @create 2019-11-24 15:50
 * RestController = responsebady + conterllor
 */
@RestController
public class HelloController {

    @Value("${user.uname}")
    private String uname;
    @Value("${user.pwd}")
    private String pwd;

    @Autowired
    private MysqlEntity mysqlEntity;

    @RequestMapping("/hello01")
    public String hello01(){
        return "Hello springboot ！ ！ ！";
    }

    @RequestMapping("/say1")
    public String say1(String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/say2/{name}")
    public String say2(@PathVariable("name") String name){
        return name + "say hello springboot 你大爷";
    }

    @RequestMapping("/json")
    public Map returnJson(){
        Map map = new HashMap();
        map.put("success",true);
        map.put("msg","恭喜你中奖了！！！");
        return map;
    }

    @RequestMapping("/say3")
    public Map say3(){
        Map map = new HashMap();
        map.put("uname",uname);
        map.put("pwd",pwd);
        return map;
    }

    @RequestMapping("/say4")
    public MysqlEntity say4(){

        return mysqlEntity;
    }
}