作为一个程序猿，使用了spring好多年，现在有了spring-boot，也想尝尝鲜。
初听spring-boot，觉得很神秘，实际上就是集合了很多组件，再加上一些boot开发的启动和粘合程序。 个人见解，不一定对。
构建过程
使用 Spring Initializr ，我使用idea构建的，在新项目里面有一个Spring Initializr 选项，如图：
设置项目属性，如图：
选择spring-boot组件：
设置项目名：
完成就可以了
第一个程序
新建Java程序
package com.sun.boot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.*;
@RestController
@EnableAutoConfiguration
public class Application {
@RequestMapping("/helloworld")
public String home() {
return "Hello World!";
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
查看build.gradle文件
buildscript {
ext {
springBootVersion = '1.5.4.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
runtime('mysql:mysql-connector-java')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
程序结构如下：
运行
运行Application，输出如下：
. ____ _ __ _ _
/\ / ___'_ __ _ _(_)_ __ __ _
( ( )\___ | '_ | '_| | '_ / _` |
\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.4.RELEASE)
2017-07-19 08:22:36.552 INFO 8372 --- [ main] com.sun.boot.Application : Starting Application on sunzuoquan-Inspiron-7466 with PID 8372 (/home/sunzuoquan/IdeaProjects/demo/build/classes/java/main started by sunzuoquan in /home/sunzuoquan/IdeaProjects/demo)
2017-07-19 08:22:36.583 INFO 8372 --- [ main] com.sun.boot.Application : No active profile set, falling back to default profiles: default
2017-07-19 08:22:37.041 INFO 8372 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@43bd930a: startup date [Wed Jul 19 08:22:36 CST 2017]; root of context hierarchy
2017-07-19 08:22:42.185 INFO 8372 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-07-19 08:22:42.210 INFO 8372 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-07-19 08:22:42.211 INFO 8372 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2017-07-19 08:22:42.747 INFO 8372 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-07-19 08:22:42.748 INFO 8372 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 5760 ms
2017-07-19 08:22:42.877 INFO 8372 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-07-19 08:22:42.880 INFO 8372 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-07-19 08:22:42.880 INFO 8372 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-07-19 08:22:42.880 INFO 8372 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-07-19 08:22:42.881 INFO 8372 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-07-19 08:22:43.338 INFO 8372 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@43bd930a: startup date [Wed Jul 19 08:22:36 CST 2017]; root of context hierarchy
2017-07-19 08:22:43.401 INFO 8372 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/helloworld]}" onto public java.lang.String com.sun.boot.Application.home()
2017-07-19 08:22:43.405 INFO 8372 --- [ 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)
2017-07-19 08:22:43.405 INFO 8372 --- [ 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)
2017-07-19 08:22:43.421 INFO 8372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 08:22:43.421 INFO 8372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 08:22:43.440 INFO 8372 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 08:22:43.634 INFO 8372 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-07-19 08:22:44.043 INFO 8372 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-07-19 08:22:44.065 INFO 8372 --- [ main] com.sun.boot.Application : Started Application in 9.217 seconds (JVM running for 15.872)
从日志可以看出，Tomcat started on port(s): 8080，spring-boot内部启动了tomcat，监听8080端口。
打开浏览器，访问：http://localhost:8080/helloworld
浏览器输出如下：
