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Lombok,热部署

作者:互联网

一.Lombok

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

2.使用步骤

-1.在IDEA里安装插件

Settings-选Plugins-搜插件名-install

-2.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>

-3.修改pojo类

用lombok前

package cn.tedu.pojo;

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

package cn.tedu.pojo;
//使用lombok

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

@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;
}

-4.测试

package cn.tedu.test;

import cn.tedu.pojo.Car;
import cn.tedu.pojo.Student;
import org.junit.jupiter.api.Test;

public class Test1 {
    //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()  );
    }

}


二.热部署

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.步骤

-1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.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

-3.测试

创建RunApp启动类

package cn.tedu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class RunApp {
    public static void main(String[] args) {
        SpringApplication.run(RunApp.class);
    }
}

创建StuController,接受请求处理响应

package cn.tedu.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@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";
    }
}

-4测试:只要刷新,就可以获取新数据

http://localhost:8080/stu/get

三两框架整合

0.项目结构

 1.概述

 2.创建网页

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>测试 两个框架整合</title>
	</head>
	<body>
		<a href="http://localhost:8080/car/get">请求服务器的数据</a>
	</body>
</html>

3.创建RunApp类启动服务器

package cn.tedu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@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);
    }
}

4.创建Car类

修改pom.xml,添加lombok包的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>

Car类

package cn.tedu.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

@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;
}

5.创建CarController类

package cn.tedu.controller;

import cn.tedu.pojo.Car;
import cn.tedu.service.CarServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@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
    }
}

6.创建CarService接口

package cn.tedu.service;
import cn.tedu.pojo.Car;
//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
}

7.创建CarServiceImpl实现类

package cn.tedu.service;

import cn.tedu.pojo.Car;
import org.springframework.stereotype.Component;
@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;
    }
}

8.测试

1.启动服务器

2.打开浏览器执行前端HTML网页,发起请求,请求服务器的数据

3.服务器收到请求后响应了准备好的数据

9.总结

 

标签:cn,部署,Car,public,import,Lombok,tedu,lombok
来源: https://blog.csdn.net/mashenk/article/details/120736858