Spring Boot学习

Posted 2020-10-09 天遮不住我的眼

Spring boot实战 —— Hello Word

1、创建maven项目

2、pom.xml文件

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <!--spring boot父依赖-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version> <!--Java版本-->
    </properties>

    <dependencies>
        <!--Spring Boot web支持-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!--maven插件-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

3、DemoApplication.java

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

@SpringBootApplication /*核心配置，是Spring Boot应用的标识*/
public class DemoApplication {

    /*main方法：应用入口*/
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

4、HelloController.java——Controller层

@RestController
public class HelloController {

    @RequestMapping(value = "hello",method = RequestMethod.GET)
    public String index(){
        return "Hello World";
    }
}

@RestController：相当于@Controller与@ResponseBody的组合

@RequestMapping：提供路由信息。上面的代码可以替换成@GetMapping("hello")

5、application.yml

设置该应用的端口为8080

server:
  port: 8080

6、运行

访问地址：http://127.0.0.1:8080/hello