注：源自Spring官方文档的DEMO IDEA+MAVEN搭建该项目 ###编写pom.xml，自动添加依赖 利用MAVEN可以解决jar版本冲突问题
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com</groupId>
<artifactId>Spring</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>Spring Maven Webapp</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.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>
###编写返回数据实体类 类路径：/src/main/java/hello/
注释： 1. id是greeting的唯一标识 2. context是内容
package hello;
/**
* Created by abb on 17-5-16.
*/
public class Greeting {
private final long id;
private final String context;
public Greeting(long id, String context) {
this.id = id;
this.context = context;
}
public long getId() {
return id;
}
public String getContext() {
return context;
}
}
###编写Controller类 类路径：/src/main/java/hello/
注释： 1. @RestController注解表明这个类是Controller类 2. @RequestMapping注解保证HTTP请求/greeting时能够被映射到greeting方法，可以指明访问方式：@RequestMapping(method=GET)/@RequestMapping(method=PUT)等 3. @RequestParam绑定请求的参数，可设置默认值。即访问时URL若没有带参数，则参数值为默认值 4. 返回数据是一个Greeting对象，但Spring的 MappingJackson2HttpMessageConverter 会自动将Greeting实例对象转换为JSON数据
package hello;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.atomic.AtomicLong;
/**
* Created by abb on 17-5-16.
* controller
*/
@RestController
public class GreetingController {
private static final String template = "Helle, %s!";
private final AtomicLong counter = new AtomicLong();
@RequestMapping
public Greeting greeting(@RequestParam(value="name", defaultValue="world!") String name){
return new Greeting(counter.incrementAndGet(),
String.format(template,name));
}
}
###编写Application类 类路径：/src/main/java/hello/
注释： 1. @SpringBootApplication注解包括了@Configuration、@EnableAutoConfiguration、@EnableWebMVC、@ComponentScan 2. 想要访问项目必须先启动main方法，用Main方法中的 SpringApplication.run() 方法发布项目.使用这种方法在HTTP运行时将项目动态加载到TOMCAT中，而不是部署一个外部实例
package hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Created by abb on 17-5-16.
*/
@SpringBootApplication
public class Application {
public static void main(String[] args){
SpringApplication.run(Application.class, args);
}
}
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