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。

@RestControllerpublic 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。