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)

 1 package com.javaxl.springboot01.controller;
 2 
 3 import com.javaxl.springboot01.configurationProperties.MysqlEntity;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.beans.factory.annotation.Value;
 6 import org.springframework.web.bind.annotation.PathVariable;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RestController;
 9 
10 import java.util.HashMap;
11 import java.util.Map;
12 
13 /**
14  * @author XuFanQi
15  * @site
16  * @company
17  * @create 2019-11-24 15:50
18  * RestController = responsebady + conterllor
19  */
20 @RestController
21 public class HelloController {
22 
23 
24     @RequestMapping("/hello01")
25     public String hello01(){
26         return "Hello springboot ！ ！ ！";
27     }
28 
29     @RequestMapping("/say1")
30     public String say1(String name){
31         return name + "say hello springboot 你大爷";
32     }
33 
34     @RequestMapping("/say2/{name}")
35     public String say2(@PathVariable("name") String name){
36         return name + "say hello springboot 你大爷";
37     }
38 
39     @RequestMapping("/json")
40     public Map returnJson(){
41         Map map = new HashMap();
42         map.put("success",true);
43         map.put("msg","恭喜你中奖了！！！");
44         return map;
45     }
46 
47 
48 }

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

 1 server:
 2   servlet:
 3     context-path: /
 4   port: 80
 5 
 6 user:
 7   uname: zs
 8   pwd: 123456

HelloController相关代码

 1 /**
 2  * @author XuFanQi
 3  * @site
 4  * @company
 5  * @create 2019-11-24 15:50
 6  * RestController = responsebady + conterllor
 7  */
 8 @RestController
 9 public class HelloController {
10 
11     @Value("${user.uname}")
12     private String uname;
13     @Value("${user.pwd}")
14     private String pwd;
15 
16     @Autowired
17     private MysqlEntity mysqlEntity;
18 
19     @RequestMapping("/hello01")
20     public String hello01(){
21         return "Hello springboot ！ ！ ！";
22     }
23 
24     @RequestMapping("/say1")
25     public String say1(String name){
26         return name + "say hello springboot 你大爷";
27     }
28 
29     @RequestMapping("/say2/{name}")
30     public String say2(@PathVariable("name") String name){
31         return name + "say hello springboot 你大爷";
32     }
33 
34     @RequestMapping("/json")
35     public Map returnJson(){
36         Map map = new HashMap();
37         map.put("success",true);
38         map.put("msg","恭喜你中奖了！！！");
39         return map;
40     }
41 
42     @RequestMapping("/say3")
43     public Map say3(){
44         Map map = new HashMap();
45         map.put("uname",uname);
46         map.put("pwd",pwd);
47         return map;
48     }
49 }

浏览器访问结果

属性封装类

定义属性封装类

application.yml

 1 server:
 2   servlet:
 3     context-path: /
 4   port: 80
 5 
 6 user:
 7   uname: zs
 8   pwd: 123456
 9   age: 18
10   sex: "男"
11   addr: "北京"

MysqlEntity

 1 package com.javaxl.springboot01.configurationProperties;
 2 
 3 import lombok.Data;
 4 import org.springframework.boot.context.properties.ConfigurationProperties;
 5 import org.springframework.stereotype.Component;
 6 
 7 /**
 8  * @author XuFanQi
 9  * @site
10  * @company
11  * @create 2019-11-24 16:52
12  */
13 @Component
14 @Data
15 @ConfigurationProperties(prefix = "user")
16 public class MysqlEntity {
17 
18     private  String uname;
19     private  String pwd;
20     private  Integer age;
21     private  String sex;
22     private  String addr;
23 }

添加pom依赖，解决报红问题

1 <dependency>
2     <groupId>org.springframework.boot</groupId>
3     <artifactId>spring-boot-configuration-processor</artifactId>
4     <optional>true</optional>
5 </dependency>

HelloController

 1 package com.javaxl.springboot01.controller;
 2 
 3 import com.javaxl.springboot01.configurationProperties.MysqlEntity;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.beans.factory.annotation.Value;
 6 import org.springframework.web.bind.annotation.PathVariable;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RestController;
 9 
10 import java.util.HashMap;
11 import java.util.Map;
12 
13 /**
14  * @author XuFanQi
15  * @site
16  * @company
17  * @create 2019-11-24 15:50
18  * RestController = responsebady + conterllor
19  */
20 @RestController
21 public class HelloController {
22 
23     @Value("${user.uname}")
24     private String uname;
25     @Value("${user.pwd}")
26     private String pwd;
27 
28     @Autowired
29     private MysqlEntity mysqlEntity;
30 
31     @RequestMapping("/hello01")
32     public String hello01(){
33         return "Hello springboot ！ ！ ！";
34     }
35 
36     @RequestMapping("/say1")
37     public String say1(String name){
38         return name + "say hello springboot 你大爷";
39     }
40 
41     @RequestMapping("/say2/{name}")
42     public String say2(@PathVariable("name") String name){
43         return name + "say hello springboot 你大爷";
44     }
45 
46     @RequestMapping("/json")
47     public Map returnJson(){
48         Map map = new HashMap();
49         map.put("success",true);
50         map.put("msg","恭喜你中奖了！！！");
51         return map;
52     }
53 
54     @RequestMapping("/say3")
55     public Map say3(){
56         Map map = new HashMap();
57         map.put("uname",uname);
58         map.put("pwd",pwd);
59         return map;
60     }
61 
62     @RequestMapping("/say4")
63     public MysqlEntity say4(){
64 
65         return mysqlEntity;
66     }
67 }