LFY-SpringBoot2【SpringBoot2入门】

1

2

<?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.haifei</groupId>
    <artifactId>boot1-helloworld</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <!--springboot设置-->
    <!--导入父工程-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>

    <!--导入（web场景启动器）起步依赖-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    <!--/springboot设置-->

</project>

package com.haifei;

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

/**
 * 主程序类;主配置类
 * @SpringBootApplication：这是一个SpringBoot应用
 */
@SpringBootApplication
public class MainApplication {

    public static void main(String[] args) {
        SpringApplication.run(MainApplication.class, args);
    }

}

 1 package com.haifei.controller;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.ResponseBody;
 6 import org.springframework.web.bind.annotation.RestController;
 7 
 8 /*@ResponseBody //@ResponseBody可以写在类上，则对类中所有方法生效
 9 @Controller*/
10 @RestController //=ResponseBody+@Controller
11 public class HelloController {
12 
13 //    @ResponseBody
14     @RequestMapping("/hello")
15     public String handle01(){
16         return "hello springboot2";
17     }
18 
19 }

3

application.properties中可以写哪些配置？怎样写？

https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties

4

<?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.haifei</groupId>
    <artifactId>boot1-helloworld</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <!--<packaging>jar</packaging>-->
    <!--<packaging>war</packaging>-->
    <!--springboot中packaging的默认值为jar包
        可直接运行在spingboot内置的web服务器中，比如tomcat(默认)、netty、jetty等
        传统的java项目只能打成war包，部署在外置的tomcat服务器中（springboot项目也可以实现）
    -->


    <!--springboot设置-->
    <!--导入父工程-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
    </parent>

    <!--导入（web场景启动器）起步依赖-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    <!--/springboot设置-->

    <!--springboot的简化部署
        把项目打成jar包，直接在目标服务器使用命令【java -jar 项目名.jar】执行即可-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>