1.Lombok
1.1 概述
简化了Model层的代码的编写. 以前pojo类/实体类,需要自己提供set get toString equals hashCode Lombok通过各种注解,简化了以上操作 @Data会自动生成set get toString equals hashCode @NoArgsConstructor自动生成无参构造 @AllArgsConstructor自动生成全参构造 @Accessors(chain = true) //开启链式编程
1.2 在IDEA里安装插件
Settings-选Plugins-搜插件名(lombok)-install
1.3 修改pom.xml文件,添加lombok的jar包依赖
<!--添加jar包依赖-->
<dependencies>
<!--添加lombok插件-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
</dependencies>
1.4修改pojo类
用lombok前
public class Car {
private Integer id;
private String name;
private String color;
private Double price;
//get set tostring
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
@Override
public String toString() {
return "Car{" +
"id=" + id +
", name='" + name + '\'' +
", color='" + color + '\'' +
", price=" + price +
'}';
}
}
用lombok后
@Data//自动生成get set tostring hashcode equals
@NoArgsConstructor//自动生成无参构造
@AllArgsConstructor//自动生成全参构造
@Accessors(chain = true)//开启链式编程
public class Student {
private Integer id;
private String name;
private String sex;
}
1.5测试
//测试lombok
@Test
public void get2(){
Student s = new Student();
Student s2 = new Student(200,"rose","女");
// s.setId(100);
// s.setName("jack");
// s.setSex("男");
//对set()可以使用lombok的链式编程
s.setId(100).setName("jack").setSex("男");
System.out.println(s);
System.out.println(s.getId()+s.getName()+s.getSex());
}
//测试Car
@Test
public void get(){
Car c = new Car();
c.setName("BMW");
String s = c.getName();
System.out.println(s);
c.setId(100);//自动装箱
Integer i = c.getId() ;
System.out.println(i);
System.out.println( c.getId() );
}
}
2 热部署
2.1概述
以前服务器改完代码,每次都需要重启服务器 现在只需要改完了重新build就行
2.2添加jar包
<!--添加热部署的jar-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<version>2.5.3</version>
</dependency>
2.3开启IDEA的热部署的功能
按下组合键: ctrl + shift + alt + / 或者 ctrl + alt + a, 选中Registry, 选中自动编译, ok
2.4创建RunApp启动类
@SpringBootApplication
public class RunApp {
public static void main(String[] args) {
SpringApplication.run(RunApp.class);
}
}
2.5创建StuController,接受请求处理响应
@RestController
@RequestMapping("stu")
public class StuController {
@RequestMapping("get")
public String get(){
//热部署:改变成新的数据,也不必重启服务器了,只是build就可以啦
return "xyz";
}
}
2.6测试: 只要刷新,就可以获取新数据
3 两框架整合
3.1创建RunApp类,启动服务器
@SpringBootApplication
//SpringBoot自动配置了包扫描:默认基于启动类所在的包
public class RunApp {
public static void main(String[] args) {
SpringApplication.run(RunApp.class);
}
}
3.2创建Car类
@Data //自动生成get set tostring...
@NoArgsConstructor //自动生成无参构造
@AllArgsConstructor//自动生成全参构造
@Accessors(chain = true)//开启链式编程
public class Car {
private String name;
private String color;
private Double price;
}
3.3修改pom.xml,添加lombok的jar包
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>cgb2106boot03</artifactId>
<groupId>cn.tedu</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>day1602</artifactId>
<dependencies>
<!--导入lombok简化pojo-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
</dependencies>
</project>
3.4创建CarController类
@RestController
@RequestMapping("car")
public class CarController {
@Autowired //想要调用service层的代码--di
private CarServiceImpl carService;
@RequestMapping("get")
public Object get(){
return carService.get(); //把结果给浏览器返回
}
}
3.5创建CarService接口
*//定义接口*
public interface CarService {
*//接口里的方法都是抽象方法,而且都是public的*
Car get(); *//获取汽车数据* *//
void add(Car c) ;//新增汽车数据* }
3.6创建CarServiceImpl实现类
@Component
//实现了接口后,要重写抽象方法
public class CarServiceImpl implements CarService{
public Car get(){
Car c = new Car();
//lombok的链式编程
c.setName("保时捷").setColor("红色").setPrice(641000.0);
return c;
}
}