Spring Boot快速搭建Restful Web应用

前言

JDK 1.8 or later
Maven 3.2+
IDE：IntelliJ IDEA

新建Maven工程

新建maven project step1

上图2，需要选择本地的jdk环境（建议1.8及以上）

新建maven project step2

构建pom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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jsou</groupId>
    <artifactId>test_demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!-- 项目名称 -->
    <name>test_demo</name>
    <!-- 项目描述 -->
    <description>Demo project for Spring Boot</description>

    <!-- 自定义参数 -->
    <properties>
        <!-- maven 编译的jdk版本 -->
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <!-- jdk版本 -->
        <java.version>1.8</java.version>
    </properties>

    <!-- 依赖包 -->
    <dependencies>
        <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>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

整体的包结构

项目结构

编写视图层实体

public class HelloVO {
    private final long id;
    private final String content;

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

    public long getId() {
        return id;
    }

    public String getContent() {
        return content;
    }
}

编写Controller

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

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

编写主启动类

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