第一个SpringBoot-优快云博客

本文介绍如何使用Spring Boot创建一个简单的Web应用，包括项目结构、pom.xml配置、控制器编写等，并展示了如何处理不同类型的HTTP请求。

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项目结构如下：

pom.xml配置如下：

<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/4.0.0https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>learning</groupId>
	<artifactId>springboot1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8
		</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.2.RELEASE</version>
	</parent>
	<dependencies>
		<!--Web开发包，将载入SpringMVC所需要的包，且内嵌tomcat -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!--一加载测试依赖包 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<!--一引入插件 -->
	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

Greeting.java用来封装数据：

package com.learning.springboot;

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;
	  }
}

HelloController.java 处理请求：

package com.learning.springboot;

import java.util.concurrent.atomic.AtomicLong;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * 可以使用@RestController方法返回的就是json数据 ，
 * 如果是@Controller，方法要返回json，需要加上@ResponseBody
 * @author Administrator
 *
 */
@Controller
@RequestMapping("/g")
public class HelloController {
	
	private AtomicLong conter = new AtomicLong();
      
	/**
	 * 加了@RequestParam表示参数必传
	 * @param name
	 * @return
	 */
	@RequestMapping("/greeting")
	@ResponseBody
	public Greeting greeting(@RequestParam(value="name") String name) {
		return new Greeting(conter.incrementAndGet(),name);
	}
	
	@GetMapping("/a/{name}")
	@ResponseBody
	public String getA(@PathVariable(value="name")String name) {
		return "helloA "+name;
	}
	
	@PostMapping("/b/{name}")
	@ResponseBody
	public String getB(@PathVariable(value="name")String name) {
		return "helloB "+name;
	}
	
	/**
	 * 这里参数name可以不传
	 * @param name
	 * @return
	 */
	@RequestMapping("/p")
	@ResponseBody
	public String getP(String name) {
		return "hellp "+ name;
	}
}

Application.java

package com.learning;

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);
	}
}

直接运行Application.java可启动服务。