Day3-SpringBoot开发工具及配置文件.md

+ Lombok

        <dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>


idea中搜索安装lombok插件
===============================简化JavaBean开发===================================
@NoArgsConstructor
//@AllArgsConstructor
@Data
@ToString
@EqualsAndHashCode
public class User {

private String name;
private Integer age;

private Pet pet;

public User(String name,Integer age){
this.name = name;
this.age = age;
}


}



================================简化日志开发===================================
@Slf4j
@RestController
public class HelloController {
@RequestMapping("/hello")
public String handle01(@RequestParam("name") String name){

log.info("请求进来了....");

return "Hello, Spring Boot 2!"+"你好:"+name;
}
}

+ dev-tools

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

项目或者页面修改以后:Ctrl+F9;

+ Spring Initailizr(项目初始化向导)

选择我们需要的开发场景

https://abc.flya.top/img/226

https://abc.flya.top/img/227

https://abc.flya.top/img/228


配置文件 yaml

person:
name:
firstname: zhang
lastname: san

1.2.1、简介

YAML 是 “YAML Ain’t Markup Language”(YAML 不是一种标记语言)的递归缩写。在开发的这种语言时,YAML 的意思其实是:”Yet Another Markup Language”(仍是一种标记语言)。

非常适合用来做以数据为中心的配置文件

  • key: value;kv之间有空格

  • 大小写敏感

  • 使用缩进表示层级关系

  • 缩进不允许使用tab,只允许空格

  • 缩进的空格数不重要,只要相同层级的元素左对齐即可

  • ‘#’表示注释

  • 字符串无需加引号,如果要加,’’与””表示字符串内容 会被 转义/不转义

==示例==

@Data
public class Person {

private String userName;
private Boolean boss;
private Date birth;
private Integer age;
private Pet pet;
private String[] interests;
private List<String> animal;
private Map<String, Object> score;
private Set<Double> salarys;
private Map<String, List<Pet>> allPets;
}

@Data
public class Pet {
private String name;
private Double weight;
}
# yaml表示以上对象
person:
userName: zhangsan
boss: false
birth: 2019/12/12 20:12:33
age: 18
pet:
name: tomcat
weight: 23.4
interests: [篮球,游泳]
animal:
- jerry
- mario
score:
english:
first: 30
second: 40
third: 50
math: [131,140,148]
chinese: {first: 128,second: 136}
salarys: [3999,4999.98,5999.99]
allPets:
sick:
- {name: tom}
- {name: jerry,weight: 47}
health: [{name: mario,weight: 47}]

### 配置提示

自定义的类和配置文件绑定一般没有提示。 这个插件可以产生提示 (IDEA)

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


<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>