作者:空灵一_一_379 | 来源:互联网 | 2023-09-04 22:36
转载来源于:Springboot学习篇之搭建HelloWorld初探一、前言Springboot是由Pivotal团队提供的全新框架,其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该
转载来源于:Springboot学习篇之搭建HelloWorld初探
一、前言
Spring boot是由Pivotal团队提供的全新框架,其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置,从而使开发人员不再需要定义样板化的配置。
Spring boot包含的特性:
♦创建独立的Spring应用程序
♦嵌入Tomcat,无需部署war文件
♦简化Maven配置
♦自动配置Spring
♦提供生产就绪功能,如指标,健康检查和外部配置
♦开箱即用,没有代码生成,也无需XML配置
为基于Spring的开发提供更快的入门体验,开箱即用,没有代码生成,也无需XML配置。同时也可以修改默认值来满足特定需求。提供了一些大型项目中常见的非功能特性,如嵌入式服务器、安全、指标、健康体检、外部配置等。Spring boot并不是对Spring功能的增强,而是提供了一种快速使用Spring的方式。
二、准备
开发环境:1.7.0_79
开发工具:Eclipse
项目管理工具:Maven3
操作系统:Windows8
Spring boot版本:1.4.1.RELEASE
三、步骤
♦搭建一个Maven工程SpringBootHelloWorld
♦POM文件中导入相关依赖
4.0.0com.queen.springbootSpringBootHelloWorld0.0.1-SNAPSHOTorg.springframework.bootspring-boot-starter-parent1.4.1.RELEASEUTF-81.7org.springframework.bootspring-boot-starter-web
我们引入了Spring boot的父节点依赖,引入这个之后相关的引用就不需要添加version配置了,Spring boot会自动选择最合适的版本进行添加。
环境中我们指定JDK的版本为1.7,默认是1.6
导入spring-boot-starter-web依赖这个地方我们没有指定版本号,是因为上面我们配置了parent,所以不用添加了。
♦编写控制类SpringBootHelloWorld
/**
* @author queen
* @since 2017-07-16
*
*/
@RestController
public class HelloWorldController {
@RequestMapping("/hello")
public String sayHello() {
return "helloWorld";
}
}
这里我们使用的@RestController注解等价于@Controller和@ResponseBody注解,使用@RequestMapping建立请求映射。
♦编写启动类APP
/**
* @author queen
* @since 2017-07-16
*
*/
@SpringBootApplication
public class APP {
public static void main(String[] args) {
SpringApplication.run(APP.class, args);
}
}
使用@SpringBootApplication注解定义APP是一个SpringBoot类型的应用,在main方法中使用SpringApplication的run方法启动我们的程序。♦右键Run As -> Java Application,启动应用,控制台启动日志如下:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.4.1.RELEASE)
2017-07-16 10:31:07.706 INFO 12108 --- [ main] com.queen.controller.APP : Starting APP on Lenovo-PC with PID 12108 (E:\queen\SpringBootHelloWorld\target\classes started by think in E:\queen\SpringBootHelloWorld)
2017-07-16 10:31:07.709 INFO 12108 --- [ main] com.queen.controller.APP : No active profile set, falling back to default profiles: default
2017-07-16 10:31:07.814 INFO 12108 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6568614: startup date [Sun Jul 16 10:31:07 CST 2017]; root of context hierarchy
2017-07-16 10:31:10.086 INFO 12108 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-07-16 10:31:10.099 INFO 12108 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2017-07-16 10:31:10.101 INFO 12108 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.5
2017-07-16 10:31:10.201 INFO 12108 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-07-16 10:31:10.202 INFO 12108 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2392 ms
2017-07-16 10:31:10.411 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-07-16 10:31:10.415 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-07-16 10:31:10.417 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-07-16 10:31:10.417 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-07-16 10:31:10.417 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-07-16 10:31:10.812 INFO 12108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6568614: startup date [Sun Jul 16 10:31:07 CST 2017]; root of context hierarchy
2017-07-16 10:31:10.906 INFO 12108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.queen.controller.HelloWorldController.sayHello()
2017-07-16 10:31:10.913 INFO 12108 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-07-16 10:31:10.913 INFO 12108 --- [ 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)
2017-07-16 10:31:10.965 INFO 12108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-16 10:31:10.966 INFO 12108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-16 10:31:11.013 INFO 12108 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-16 10:31:11.320 INFO 12108 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-07-16 10:31:11.391 INFO 12108 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-07-16 10:31:11.398 INFO 12108 --- [ main] com.queen.controller.APP : Started APP in 4.301 seconds (JVM running for 4.619)
启动后默认端口号是8080♦使用http://localhost:8080/hello看是否能够访问我们的应用
访问成功。
至此,我们使用Spring boot搭建的第一个HelloWorld小程序完成。