概述
相信对于Java开发者而言，spring和springMvc两个框架一定不陌生，这两个框架需要我们手动配置的地方非常多，各种的xml文件，properties文件，构建一个项目还是挺复杂的，在这种情况下，springboot应运而生，他能够快速的构建spring项目，而且让项目正常运行起来的配置文件非常少，甚至只需要几个注解就可以运行整个项目。
总的说来，springboot项目可以打成jar包独立运行部署，因为它内嵌servlet容器，之前spring，springMvc需要的大量依赖，可以通过starter来帮助我们简化配置，当然还有其他好多优点，这里就不一一赘述，小伙伴们可以自行搜索解答。
简单项目构建
工具
eclipse maven
首先，我们新建一个maven项目，在eclipse左侧右击选择new----》other,选择新建Maven project
输入group Id，artifact Id，点击完成
这样一个简单的项目架子就完成了，但是啥都没有，项目结构如下图所示：
下面我们就开始配置搭建springboot项目。
1.添加依赖
完整porm代码如下：
<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/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cfxmn.springboot</groupId>
<artifactId>springbootDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<!-- 通过继承spring-boot-starter-parent项目来获得一些合理的默认配置 -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- Spring Boot Web 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Spring Boot Test 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- 使用Lombok可以减少很多重复代码的书写。比如说getter/setter/toString等方法的编写 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
</project>下面我们新建一些包和添加项目的启动类，如下图所示：
其中，控制器DemoController的内容非常简单，内容如下：
package com.cfxmn.springboot.springbootDemo.controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import lombok.extern.slf4j.Slf4j;
@RestController
@Slf4j
public class DemoController {
@PostMapping("/demo")
public void demoTest() {
// 这边简单起见，打印一下日志
log.info("success call");
}
}可能有些同学对其中的几个注解有些疑问，我这边简单说明下，
1.RestController
这个注解其实就是@ResponseBody ＋ @Controller
2.PostMapping
这个注解其实就是@RequestMapping("xxxxxx", Method=RequestMethod.POST)
这两个其实都是组合注解，简化使用
我们再来看看，项目的启动类SpringbootDemoApplication的内容：
package com.cfxmn.springboot.springbootDemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootDemoApplication.class, args);
}
}是的，你没看错，只要运行这个main方法，就能启动这个spring项目，具体是怎么启动的容器，我们之后再分析，其实主要就是在注解SpringBootApplication上。
下面我们就来运行下，看下启动日志：
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _
( ( )___ | '_ | '_| | '_ / _` |
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.6.RELEASE)
2018-10-25 23:52:41.985 INFO 1700 --- [ main] c.c.s.s.SpringbootDemoApplication : Starting SpringbootDemoApplication on DESKTOP-KB78HJK with PID 1700 (E:workspacespringbootDemo argetclasses started by gepengfa in E:workspacespringbootDemo)
2018-10-25 23:52:41.990 INFO 1700 --- [ main] c.c.s.s.SpringbootDemoApplication : No active profile set, falling back to default profiles: default
2018-10-25 23:52:42.088 INFO 1700 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7f416310: startup date [Thu Oct 25 23:52:42 CST 2018]; root of context hierarchy
2018-10-25 23:52:44.561 INFO 1700 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2018-10-25 23:52:44.584 INFO 1700 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-10-25 23:52:44.588 INFO 1700 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.16
2018-10-25 23:52:44.813 INFO 1700 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-10-25 23:52:44.813 INFO 1700 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2733 ms
2018-10-25 23:52:45.074 INFO 1700 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2018-10-25 23:52:45.083 INFO 1700 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-10-25 23:52:45.083 INFO 1700 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-10-25 23:52:45.083 INFO 1700 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-10-25 23:52:45.085 INFO 1700 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-10-25 23:52:45.582 INFO 1700 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7f416310: startup date [Thu Oct 25 23:52:42 CST 2018]; root of context hierarchy
2018-10-25 23:52:45.705 INFO 1700 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/demo],methods=[POST]}" onto public void com.cfxmn.springboot.springbootDemo.controller.DemoController.demoTest()
2018-10-25 23:52:45.710 INFO 1700 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-10-25 23:52:45.711 INFO 1700 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-10-25 23:52:45.759 INFO 1700 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-25 23:52:45.759 INFO 1700 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-25 23:52:45.817 INFO 1700 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-25 23:52:46.321 INFO 1700 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-10-25 23:52:46.529 INFO 1700 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-10-25 23:52:46.599 INFO 1700 --- [ main] c.c.s.s.SpringbootDemoApplication : Started SpringbootDemoApplication in 5.092 seconds (JVM running for 5.764)
从启动日志标黄的部分可以看出，项目启动成功了，访问端口默认是8080（这个端口是可以改动的）
下面我们通过postMan请求下，
查看控制台
2018-10-25 23:59:26.385 INFO 1700 --- [nio-8080-exec-2] c.c.s.s.controller.DemoController : success call说明调用成功。
到此，一个简单的springboot项目就构建完成了，但这只是一个空的架子，内容还可载丰富。
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