用spring boot 来创建第一个application

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5 
 6     <groupId>com.example</groupId>
 7     <artifactId>myproject</artifactId>
 8     <version>0.0.1-SNAPSHOT</version>
 9 
10     <parent>
11         <groupId>org.springframework.boot</groupId>
12         <artifactId>spring-boot-starter-parent</artifactId>
13         <version>2.2.0.M2</version>
14     </parent>
15 
16     <!-- Additional lines to be added here... -->
17 
18     <!-- (you don‘t need this if you are using a .RELEASE version) -->
19     <repositories>
20         <repository>
21             <id>spring-snapshots</id>
22             <url>https://repo.spring.io/snapshot</url>
23             <snapshots><enabled>true</enabled></snapshots>
24         </repository>
25         <repository>
26             <id>spring-milestones</id>
27             <url>https://repo.spring.io/milestone</url>
28         </repository>
29     </repositories>
30     <pluginRepositories>
31         <pluginRepository>
32             <id>spring-snapshots</id>
33             <url>https://repo.spring.io/snapshot</url>
34         </pluginRepository>
35         <pluginRepository>
36             <id>spring-milestones</id>
37             <url>https://repo.spring.io/milestone</url>
38         </pluginRepository>
39     </pluginRepositories>
40 </project>

1 $ mvn依赖：树
2 [INFO] com.example：myproject：jar：0.0.1-SNAPSHOT

1 <dependencies>
2     <dependency>
3         <groupId>org.springframework.boot</groupId>
4         <artifactId>spring-boot-starter-web</artifactId>
5     </dependency>
6 </dependencies>

 1 import org.springframework.boot.*;
 2 import org.springframework.boot.autoconfigure.*;
 3 import org.springframework.web.bind.annotation.*;
 4 
 5 @RestController
 6 @EnableAutoConfiguration
 7 public class Example {
 8 
 9     @RequestMapping("/")
10     String home() {
11         return "Hello World!";
12     }
13 
14     public static void main(String[] args) {
15         SpringApplication.run(Example.class, args);
16     }
17 
18 }

 1 $ mvn spring-boot：run
 2 
 3   。____ _ __ _ _
 4  / \\ / ___‘_ __ _ _（_）_ __ __ _ \ \ \  5 （（）\ ___ |‘_ |‘_ | |‘_ \ / _` | \ \ \  6  \\ / ___）| | _）| | | | | || （_ | |））））
 7   ‘| ____ | .__ | _ | | _ | _ | | _ \ __，| / / / / /
 8  ========= | _ | ============== | ___ / = / _ / _ / _ /
 9  :: Spring Boot ::（v2.2.0.M2）
10 ....... 。。
11 ....... 。。（此处输出日志）
12 ....... 。。
13 ........ 2.222秒启动示例（JVM运行6.514）

1 你好，世界！

1 <build>
2     <plugins>
3         <plugin>
4             <groupId>org.springframework.boot</groupId>
5             <artifactId>spring-boot-maven-plugin</artifactId>
6         </plugin>
7     </plugins>
8 </build>

 1 $ mvn包
 2 
 3 [INFO]扫描项目......
 4 [信息]
 5 [INFO] ----------------------------------------------- -------------------------
 6 [INFO]构建myproject 0.0.1-SNAPSHOT
 7 [INFO] ----------------------------------------------- -------------------------
 8 [INFO] ....
 9 [INFO] --- maven-jar-plugin：2.4：jar（default-jar）@ myproject ---
10 [INFO]构建jar：/Users/developer/example/spring-boot-example/target/myproject-0.0.1-SNAPSHOT.jar
11 [信息]
12 [INFO] --- spring-boot-maven-plugin：2.2.0.M2：重新打包（默认）@ myproject ---
13 [INFO] ----------------------------------------------- -------------------------
14 [信息]建立成功
15 [INFO] ----------------------------------------------- -------------------------

1 $ jar tvf target / myproject-0.0.1-SNAPSHOT.jar

 1 $ java -jar target / myproject-0.0.1-SNAPSHOT.jar
 2 
 3   。____ _ __ _ _
 4  / \\ / ___‘_ __ _ _（_）_ __ __ _ \ \ \  5 （（）\ ___ |‘_ |‘_ | |‘_ \ / _` | \ \ \  6  \\ / ___）| | _）| | | | | || （_ | |））））
 7   ‘| ____ | .__ | _ | | _ | _ | | _ \ __，| / / / / /
 8  ========= | _ | ============== | ___ / = / _ / _ / _ /
 9  :: Spring Boot ::（v2.2.0.M2）
10 ....... 。。
11 ....... 。。（此处输出日志）
12 ....... 。。
13 ........ 2.536秒启动示例（JVM运行2.864）