快速构建一个基于Spring的RESTful Web Service

矫情吗；* 2022-08-21 06:00 198阅读 0赞

[http://blog.csdn.net/u010902721/article/details/51203444][http_blog.csdn.net_u010902721_article_details_51203444]  
不使用IDE工具，通过命令行快速构建一个基于Spring的RESTful Web Service。

# 需要的工具 #

1、maven（不会使用的话可以参考[http://blog.csdn.net/u010902721/article/details/51203170][http_blog.csdn.net_u010902721_article_details_51203170]）  
2、文本编辑器。

# 开始 #

该工程会接受HTTP GET请求，请求网址是[http://localhost:8080/greeting][http_localhost_8080_greeting]。  
然后返回json格式数据`{"id":1,"content":"Hello, World!"}`。  
当url中含有参数时，例如`http://localhost:8080/greeting?name=User`，返回的数据是`{"id":1,"content":"Hello, User!"}`。  
在项目根目录下创建子目录结构如下：

└── src
        └── main
            └── java
                └── hello

在项目根目录下新建pom.xml，内容如下：

<?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>1.3.3.RELEASE</version>
        </parent>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </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>

新建src/main/java/hello/Greeting.java，代码如下：

package hello;
    
    public class Greeting { 
    
        private final long id;
        private final String content;
    
        public Greeting(long id, String content) {
            this.id = id;
            this.content = content;
        }
    
        public long getId() {
            return id;
        }
    
        public String getContent() {
            return content;
        }
    }

新建src/main/java/hello/GreetingController.java，代码如下：

package hello;
    
    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 GreetingController { 
    
        private static final String template = "Hello, %s!";
        private final AtomicLong counter = new AtomicLong();
    
        @RequestMapping("/greeting")
        public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
            return new Greeting(counter.incrementAndGet(),
                                String.format(template, name));
        }
    }

新建src/main/java/hello/Application.java， 代码如下：

package hello;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class Application { 
    
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
    }

命令行转移到项目根目录下，windows下执行以下命令（linux下改一下/）：

mvn package
    mvn java -jar target/gs-rest-service-0.1.0.jar

打开浏览器输入[http://localhost:8080/greeting][http_localhost_8080_greeting]查看结果。  
参考文献：[http://spring.io/guides/gs/rest-service/\#scratch][http_spring.io_guides_gs_rest-service_scratch]

[http_blog.csdn.net_u010902721_article_details_51203444]: http://blog.csdn.net/u010902721/article/details/51203444
[http_blog.csdn.net_u010902721_article_details_51203170]: http://blog.csdn.net/u010902721/article/details/51203170
[http_localhost_8080_greeting]: http://localhost:8080/greeting
[http_spring.io_guides_gs_rest-service_scratch]: http://spring.io/guides/gs/rest-service/#scratch