Spring Boot
Spring Boot旨在让您尽快起步并开始运行，最少的Spring前期配置。
Spring Boot 对构建可用于生产的应用程序持坚定态度。
Hello World
项目结构
│ pom.xml
└─src
└─main
├─java
│ └─com
│ └─ryo
│ └─spring
│ └─boot
│ └─learn
│ └─hw
│ └─controller
│ SampleController.java
文件内容
- pom.xml
引入指定的 jar
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
- SampleController.java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@EnableAutoConfiguration
public class SampleController {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!";
}
public static void main(String[] args) throws Exception {
SpringApplication.run(SampleController.class, args);
}
}
运行
直接运行 SampleController.main()，日志如下:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.9.RELEASE)
2017-12-19 15:18:50.620 INFO 6676 --- [ main] c.r.s.b.l.h.controller.SampleController : Starting SampleController on bbhou-PC with PID 6676 (D:\CODE\fork\spring-boot-learn\spring-boot-learn-hw\target\classes started by bbhou in D:\CODE\fork\spring-boot-learn)
2017-12-19 15:18:50.623 INFO 6676 --- [ main] c.r.s.b.l.h.controller.SampleController : No active profile set, falling back to default profiles: default
2017-12-19 15:18:50.664 INFO 6676 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1c72da34: startup date [Tue Dec 19 15:18:50 CST 2017]; root of context hierarchy
2017-12-19 15:18:51.621 INFO 6676 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-12-19 15:18:51.628 INFO 6676 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-12-19 15:18:51.629 INFO 6676 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2017-12-19 15:18:51.738 INFO 6676 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-12-19 15:18:51.738 INFO 6676 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1079 ms
2017-12-19 15:18:51.839 INFO 6676 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-19 15:18:51.843 INFO 6676 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-12-19 15:18:51.843 INFO 6676 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-12-19 15:18:51.844 INFO 6676 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-12-19 15:18:51.844 INFO 6676 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-12-19 15:18:52.093 INFO 6676 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1c72da34: startup date [Tue Dec 19 15:18:50 CST 2017]; root of context hierarchy
2017-12-19 15:18:52.152 INFO 6676 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto java.lang.String com.ryo.spring.boot.learn.hw.controller.SampleController.home()
2017-12-19 15:18:52.156 INFO 6676 --- [ 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)
2017-12-19 15:18:52.157 INFO 6676 --- [ 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)
2017-12-19 15:18:52.181 INFO 6676 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-19 15:18:52.182 INFO 6676 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-19 15:18:52.208 INFO 6676 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-19 15:18:52.320 INFO 6676 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-12-19 15:18:52.368 INFO 6676 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-12-19 15:18:52.373 INFO 6676 --- [ main] c.r.s.b.l.h.controller.SampleController : Started SampleController in 1.965 seconds (JVM running for 2.962)
访问
打开浏览器访问 http://localhost:8080/
内容如下:
Hello World!
小结
和 spring mvc 相比，简单太多。确切的说，很多东西都被默认配置好了。
而且我相信，这也不单单是简化版的 spring mvc 而已。
本实战系列用于记录 springboot 的实际使用和学习笔记。
拓展阅读：
希望本文对比有所帮助，如果喜欢，欢迎点赞转发收藏一波。
我是老马，期待与你的下次相遇。
