SpringBoot简单搭建

小咪咪 2023-08-17 15:58 102阅读 0赞

## 1、创建一个maven工程 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0ODE5Mzcy_size_16_color_FFFFFF_t_70][]

构建完成结构

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0ODE5Mzcy_size_16_color_FFFFFF_t_70 1][]

## 2、搭建SpringBoot 项目 ##

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首先添加依赖pom.xml

<?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">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.cat.code</groupId>
        <artifactId>spring-boot-base-bulid</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.21.RELEASE</version>
        </parent>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
        </dependencies>
    </project>

创建资源文件application.yml或者application.properties文件，但两者配置格式不一样

spring:
      application:
        name: base-bulid-spring-boot #服务名
    server:
      port: 8084 #端口

启动类【注意文件位置】

package com.cat.code;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /**
     * @Author: lvgang
     * @Time: 2019/9/27 16:13
     * @Description: todo
     */
    @SpringBootApplication
    public class BaseBuildSpringBootApplication {
    
        public static void main(String[] args){
            SpringApplication.run(BaseBuildSpringBootApplication.class,args);
        }
    }

controller层

package com.cat.code.controller;
    
    import com.cat.code.service.TestService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    /**
     * @Author: lvgang
     * @Time: 2019/9/27 16:19
     * @Description: todo
     */
    @RestController
    public class TestController {
    
        @Autowired
        private TestService testService;
    
        @GetMapping("/test")
        public String test(){
            return testService.test();
        }
    
    }

service层

package com.cat.code.service;
    
    import org.springframework.stereotype.Service;
    
    /**
     * @Author: lvgang
     * @Time: 2019/9/27 16:19
     * @Description: todo
     */
    @Service
    public class TestService {
    
        public String test(){
            return "ok";
        }
    }

最后启动启动类的主函数，在浏览器访问[http://localhost:8084/test][http_localhost_8084_test]即可访问

【注】

1、@service所注解的类名不可以与spring自带的类名相同，不然会出现

Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'xxxService' is expected to be of type 'yyy' but was actually of type 'zzz'

2、springboot项目可以自动扫描组件是因为启动添加了注解@SpringBootApplication，可以看到该注解源码包含自动配置和组件扫描等注解功能

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0ODE5Mzcy_size_16_color_FFFFFF_t_70 3][]

3、application.yml 文件中是额外指定配置，格式为缩进式

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[http_localhost_8084_test]: http://localhost:8084/test
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