Spring Boot简介

Spring Boot让我们的Spring应用变的更轻量化。比如：你可以仅仅依靠一个Java类来运行一个Spring引用。你也可以打包你的应用为jar并通过使用java -jar来运行你的Spring Web应用。

Spring Boot的主要优点：

• 为所有Spring开发者更快的入门
• 开箱即用，提供各种默认配置来简化项目配置
• 内嵌式容器简化Web项目
• 没有冗余代码生成和XML配置的要求

<parent>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-parent</artifactId>

    <version>1.5.4.RELEASE</version>

    <relativePath/> <!-- lookup parent from repository -->

  </parent>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

    <java.version>1.8</java.version>

  </properties>

  <dependencies>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter</artifactId>

    </dependency>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-test</artifactId>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-web</artifactId>

    </dependency>

  </dependencies>

package com.xzh.demo;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

@SpringBootApplication

public class DemoApplication {

    @RequestMapping("/hello")

    public String index() {

        return "Hello World!!!";

    }

    public static void main(String[] args) {

        SpringApplication.run(com.xzh.demo.DemoApplication.class, args);

    }

}

2017-07-21 16:18:35.787  INFO 19984 --- [           main] com.xzh.demo.DemoApplication             : Starting DemoApplication on LAPTOP-T56QDVQ2 with PID 19984 (F:\workspaceIDEA\helloworld\target\classes started by lenovo in F:\workspaceIDEA\helloworld)

2017-07-21 16:18:35.789  INFO 19984 --- [           main] com.xzh.demo.DemoApplication             : No active profile set, falling back to default profiles: default

2017-07-21 16:18:35.837  INFO 19984 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@8646db9: startup date [Fri Jul 21 16:18:35 CST 2017]; root of context hierarchy

2017-07-21 16:18:37.293  INFO 19984 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)

2017-07-21 16:18:37.305  INFO 19984 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]

2017-07-21 16:18:37.306  INFO 19984 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.15

2017-07-21 16:18:37.375  INFO 19984 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext

2017-07-21 16:18:37.375  INFO 19984 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1542 ms

2017-07-21 16:18:37.477  INFO 19984 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]

2017-07-21 16:18:37.481  INFO 19984 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

2017-07-21 16:18:37.481  INFO 19984 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]

2017-07-21 16:18:37.481  INFO 19984 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]

2017-07-21 16:18:37.481  INFO 19984 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]

2017-07-21 16:18:37.735  INFO 19984 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@8646db9: startup date [Fri Jul 21 16:18:35 CST 2017]; root of context hierarchy

2017-07-21 16:18:37.769  INFO 19984 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.xzh.demo.DemoApplication.index()

2017-07-21 16:18:37.772  INFO 19984 --- [           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)

2017-07-21 16:18:37.772  INFO 19984 --- [           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)

2017-07-21 16:18:37.789  INFO 19984 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2017-07-21 16:18:37.789  INFO 19984 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2017-07-21 16:18:37.810  INFO 19984 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2017-07-21 16:18:37.887  INFO 19984 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup

2017-07-21 16:18:37.916  INFO 19984 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)

2017-07-21 16:18:37.919  INFO 19984 --- [           main] com.xzh.demo.DemoApplication             : Started DemoApplication in 2.324 seconds (JVM running for 2.719)

2017-07-21 16:18:41.874  INFO 19984 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'

2017-07-21 16:18:41.874  INFO 19984 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started

2017-07-21 16:18:41.883  INFO 19984 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 9 ms