不喜欢废话直接上步骤
1.创建一个新项目(Create New Project)
选择 Spring Initializr，Project SDK 选择 1.8，URL 填写默认的，点击 Next
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2.继续项目配置
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Name：项目名称
Type：我们是Maven构建的，那么选择第一个Maven Project
Packaging：打包类型，打包成Jar文件
Java Version：jdk版本，选择1.8
Language：开发语言，选择Java
Group：对应pom文件中的groupId，项目组织的唯一标识，对应Java包的结构
Artifact：对应pom文件的artifactId，项目唯一标识，对应项目名称
Version：项目版本，对应pom文件的version
Description：项目描述，对应pom文件的description
Package：包名
3.Spring Boot 版本选择，我这里选择了2.0.4，只要勾选Web下的web就可以了，然后Next
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4.填写项目名称，项目存放的目录，点击 Finish
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5.可以将下面这三个无关的文件删除，干净结构
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6.最后的项目结构
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这里看一下自动生成的pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<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.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
7.新建一个Controller进行测试
@RestController public class HelloController {
@RequestMapping(value = "/hello") public String hello() { return "hello,Spring Boot";
}
}
//@RestController的意思就是controller里面的方法都以json格式输出，不用再写什么jackjson配置的了！
//整个项目的启动类就是上面的DemoApplication
@SpringBootApplication public class DemoApplication { public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
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8.启动成功信息，端口8080
/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/bin/java -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=54652 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=127.0.0.1 -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=54653:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home/lib/tools.jar:/Users/guoyuan/java/demo/target/classes:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-starter-web/2.0.4.RELEASE/spring-boot-starter-web-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-starter/2.0.4.RELEASE/spring-boot-starter-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot/2.0.4.RELEASE/spring-boot-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.0.4.RELEASE/spring-boot-autoconfigure-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-starter-logging/2.0.4.RELEASE/spring-boot-starter-logging-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar:/Users/guoyuan/.m2/repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar:/Users/guoyuan/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.10.0/log4j-to-slf4j-2.10.0.jar:/Users/guoyuan/.m2/repository/org/apache/logging/log4j/log4j-api/2.10.0/log4j-api-2.10.0.jar:/Users/guoyuan/.m2/repository/org/slf4j/jul-to-slf4j/1.7.25/jul-to-slf4j-1.7.25.jar:/Users/guoyuan/.m2/repository/javax/annotation/javax.annotation-api/1.3.2/javax.annotation-api-1.3.2.jar:/Users/guoyuan/.m2/repository/org/yaml/snakeyaml/1.19/snakeyaml-1.19.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-starter-json/2.0.4.RELEASE/spring-boot-starter-json-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.9.6/jackson-databind-2.9.6.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.9.0/jackson-annotations-2.9.0.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.9.6/jackson-core-2.9.6.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.9.6/jackson-datatype-jdk8-2.9.6.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.9.6/jackson-datatype-jsr310-2.9.6.jar:/Users/guoyuan/.m2/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.9.6/jackson-module-parameter-names-2.9.6.jar:/Users/guoyuan/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/2.0.4.RELEASE/spring-boot-starter-tomcat-2.0.4.RELEASE.jar:/Users/guoyuan/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.5.32/tomcat-embed-core-8.5.32.jar:/Users/guoyuan/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/8.5.32/tomcat-embed-el-8.5.32.jar:/Users/guoyuan/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/8.5.32/tomcat-embed-websocket-8.5.32.jar:/Users/guoyuan/.m2/repository/org/hibernate/validator/hibernate-validator/6.0.11.Final/hibernate-validator-6.0.11.Final.jar:/Users/guoyuan/.m2/repository/javax/validation/validation-api/2.0.1.Final/validation-api-2.0.1.Final.jar:/Users/guoyuan/.m2/repository/org/jboss/logging/jboss-logging/3.3.2.Final/jboss-logging-3.3.2.Final.jar:/Users/guoyuan/.m2/repository/com/fasterxml/classmate/1.3.4/classmate-1.3.4.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-web/5.0.8.RELEASE/spring-web-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-beans/5.0.8.RELEASE/spring-beans-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-webmvc/5.0.8.RELEASE/spring-webmvc-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-aop/5.0.8.RELEASE/spring-aop-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-context/5.0.8.RELEASE/spring-context-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-expression/5.0.8.RELEASE/spring-expression-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-core/5.0.8.RELEASE/spring-core-5.0.8.RELEASE.jar:/Users/guoyuan/.m2/repository/org/springframework/spring-jcl/5.0.8.RELEASE/spring-jcl-5.0.8.RELEASE.jar com.example.demo.DemoApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.4.RELEASE)
2018-08-07 22:49:35.574 INFO 2074 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on MacdeMac-mini.local with PID 2074 (/Users/guoyuan/java/demo/target/classes started by guoyuan in /Users/guoyuan/java/demo)
2018-08-07 22:49:35.581 INFO 2074 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2018-08-07 22:49:35.656 INFO 2074 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@7ff95560: startup date [Tue Aug 07 22:49:35 CST 2018]; root of context hierarchy
2018-08-07 22:49:36.978 INFO 2074 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-08-07 22:49:36.996 INFO 2074 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-08-07 22:49:36.996 INFO 2074 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-08-07 22:49:37.000 INFO 2074 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/guoyuan/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
2018-08-07 22:49:37.107 INFO 2074 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-08-07 22:49:37.107 INFO 2074 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1455 ms
2018-08-07 22:49:37.151 INFO 2074 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-08-07 22:49:37.156 INFO 2074 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-08-07 22:49:37.156 INFO 2074 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-08-07 22:49:37.157 INFO 2074 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-08-07 22:49:37.157 INFO 2074 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-08-07 22:49:37.277 INFO 2074 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-07 22:49:37.424 INFO 2074 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@7ff95560: startup date [Tue Aug 07 22:49:35 CST 2018]; root of context hierarchy
2018-08-07 22:49:37.468 INFO 2074 --- [ 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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-08-07 22:49:37.469 INFO 2074 --- [ 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.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-08-07 22:49:37.495 INFO 2074 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-07 22:49:37.496 INFO 2074 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-08-07 22:49:37.632 INFO 2074 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-08-07 22:49:37.681 INFO 2074 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-08-07 22:49:37.686 INFO 2074 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 2.512 seconds (JVM running for 3.787)
9.到浏览器中输入 http://localhost:8080/hello
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上面讲的打包方式是jar，试了一下war的打包方式，生成的目录结构是这样的
image
10.这是一些附加了解
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。通过这种方式，Boot致力于在蓬勃发展的快速应用开发领域（rapid application development）成为领导者。
使用spring boot有什么好处
其实就是简单、快速、方便！平时如果我们需要搭建一个spring web项目的时候需要怎么做呢？
1）配置web.xml，加载spring和spring mvc
2）配置数据库连接、配置spring事务
3）配置加载配置文件的读取，开启注解
4）配置日志文件
...
配置完成之后部署tomcat 调试
...
我仅仅只需要非常少的几个配置就可以迅速方便的搭建起来一套web项目或者是构建一个微服务！
希望对刚刚学习java的你有点帮助
