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
使用Idea配置SpringBoot项目



项目启动:

java源文件夹中的springbootApplication.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
启动成功访问界面如下:

测试代码:
package com.ssm.springboot.controller;
import com.ssm.springboot.Properties.BaseEntity;
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 xyls
* @blog name & blog address 027@0030
* @create 2019-11-24 14:57
*/
@RestController
public class Mycontroller {
@Value("${user.uname}")
private String uname;
@Value("${user.pwd}")
private String pwd;
@Autowired
private BaseEntity baseEntity;
@RequestMapping("/demo1")
public String demo1() {
return "hello demo1";
}
@RequestMapping("/by1")
public String by1(String name) {
return name + "say hello springboot";
}
@RequestMapping("/by2/{name}")
public String by2(@PathVariable("name") String name) {
return name + "say hello springboot";
}
@RequestMapping("/byjson")
public Map returnJson() {
Map map = new HashMap();
map.put("success", true);
map.put("msg", "恭喜!!!");
return map;
}
@RequestMapping("/by3")
public Map by3() {
Map map = new HashMap();
map.put("uname", uname);
map.put("pwd", pwd);
return map;
}
@RequestMapping("/by4")
public BaseEntity by4() {
return baseEntity;
}
}




Springboot配置文件
内置属性

自定义属性
Application.properties中配置

注意:

user前面不能有空格,否则报错

controler对应的Java代码
package com.ssm.springboot.controller;
import com.ssm.springboot.Properties.BaseEntity;
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 xyls
* @blog name & blog address 027@0030
* @create 2019-11-24 14:57
*/
@RestController
public class Mycontroller {
@Value("${user.uname}")
private String uname;
@Value("${user.pwd}")
private String pwd;
@RequestMapping("/by3")
public Map by3() {
Map map = new HashMap();
map.put("uname", uname);
map.put("pwd", pwd);
return map;
}
}

属性封装类
定义属性封装类
package com.ssm.springboot.Properties;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
/**
* @author xyls
* @blog name & blog address 027@0030
* @create 2019-11-24 15:57
*/
@Component
@Data
@ConfigurationProperties(prefix = "user")
public class BaseEntity {
private String uname;
private String pwd;
private Integer age;
private String sex;
private String address;
}
加一个pom依赖:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency>
添加controler层的Java代码进行测试
package com.ssm.springboot.controller;
import com.ssm.springboot.Properties.BaseEntity;
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 xyls
* @blog name & blog address 027@0030
* @create 2019-11-24 14:57
*/
@RestController
public class Mycontroller {
@Autowired
private BaseEntity baseEntity;
@RequestMapping("/by4")
public BaseEntity by4() {
return baseEntity;
}
}


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