无法运行构建Spring Boot Rest服务的入门指南代码

Question

我正在尝试使用Spring Boot构建rest服务。我正在学习如何使用this Spring指南来实现它。我使用STS构建了应用程序作为Maven应用程序，代码完全是指南的副本，当我尝试运行该应用程序时，我得到以下连接错误

​

​

我还尝试为Spring提供的相同指南运行github code，该代码也给出了与上面相同的错误。我是Spring Boot的新手，任何帮助都将不胜感激。

下面是我的代码App.java

    package Greetings.Web_Services;

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

    @SpringBootApplication
    public class App 
    {
        public static void main( String[] args )
        {
            System.out.println("App Started");
            SpringApplication.run(App.class, args);
        }
    }

Greetings.java

    package Greetings.Web_Services;

    public class Greetings {

        private final long id;
        private final String content;

        public Greetings(long id, String content){
            this.id = id;
            this.content = content;
        }

        public long getId(){
            return id;
        }

        public String getContent(){
            return content;
        }
    }

GreetingsController.java

    package Greetings.Web_Services;

    import java.util.concurrent.atomic.AtomicLong;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;

    @RestController
    public class GreetingsController {
        private static final String template = "Hello, %s!";
        private final AtomicLong counter = new AtomicLong();

        @RequestMapping("/greeting")
        public Greetings greeting(@RequestParam(value="name", defaultValue="World") String name) {
            return new Greetings(counter.incrementAndGet(),
                        String.format(template, name));
        }
    }

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>org.springframework</groupId>
<artifactId>gs-rest-service</artifactId>
<version>0.1.0</version>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
</parent>

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

    <!-- <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency> -->

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.3.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.jayway.jsonpath</groupId>
        <artifactId>json-path</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<properties>
    <java.version>1.8</java.version>
</properties>


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

<repositories>
    <repository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </pluginRepository>
</pluginRepositories>

    </project>

以上代码的项目的GitHub link

谢谢！！

Answer 1

指南中的代码是正确的，并且它之前不起作用，我也在指南的GitHub社区中提出了一个问题。后来，当我更新STS并重新启动时，它现在似乎可以工作了。在我解释了这个场景后，社区中的一位修改者也推荐了同样的建议。希望这能节省一些人的时间。