SpringBoot Rest-api开发

最近要开发Restful风格的WebService,但是不是很了解Rest-Api的开发流程，于是spring官网看了搭建rest－api的例子,从pom.xml开始，简单记录下一个Rest－api的开发。

一.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>1.5.8.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-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>

二.Bean

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;
}
}

三.Controller的创建

为了实现Restful web Service，Http请求由控制器处理，这些组件通过@RestController识别。

@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));
}
}

四.启动方法

@SpringBootApplication

public class Application {

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

Springboot展现了简单的方法创建了独立应用程序。将所有的内容打包在一个单一的、可执行的JAR文件中，由一个Java main()方法驱动

五.打包成可运行的jar

Gradle 构建

java -jar build/libs/gs-rest-service-0.1.0.jar

Maven构建

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

六.测试

输入http://localhost:8080/greeting

{"id":1,"content":"Hello, World!"}

输入http://localhost:8080/greeting?name=user

{"id":2,"content":"Hello, User!"}

还要注意id属性从1到2的变化。这证明在处理多个请求的相同的GreetingController实例，并且它的计数器字段在每次调用时都按预期递增。