SpringBoot初步应用(一)
在Java的技术栈体系中，使用SpringBoot可以很轻松的解决Spring各个版本之间的配置问题。使用SpringBoot的框架
就可以开发对应的REST API就变得更加轻松。在本文章中，主要介绍如何创建SpringBoot的项目以及它的初步应用。打开
IDEA，在插件中安装搜索Lombok和Spring Assistant的插件，搜索到后，进行安装，然后重新启动IDEA，这样这两个插件
就会自动下载以及安装好，具体见安装后的情况。
下面使用Assistant的插件来创建Spring Boot的项目，先创建项目，然后在左侧选择Assistant插件，具体如下所示：
然后点击下一步，下来填写项目信息：
填写后，再次点击next，在Developer Toos里面选择Lombok，在Web里面选择Spring Web，如下所示：
然后点击下一步，填写项目信息，最后点击Finish。创建完成后，项目整体目录如下：
PaasApplication的源码为：
package com.example.paas; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class PaasApplication { public static void main(String[] args) { SpringApplication.run(PaasApplication.class, args); } }
pom.xml的文件源码为：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.5.1</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>paas.example</groupId> <artifactId>paas</artifactId> <version>0.0.1-SNAPSHOT</version> <name>paas</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.restdocs</groupId> <artifactId>spring-restdocs-mockmvc</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.asciidoctor</groupId> <artifactId>asciidoctor-maven-plugin</artifactId> <version>1.5.8</version> <executions> <execution> <id>generate-docs</id> <phase>prepare-package</phase> <goals> <goal>process-asciidoc</goal> </goals> <configuration> <backend>html</backend> <doctype>book</doctype> </configuration> </execution> </executions> <dependencies> <dependency> <groupId>org.springframework.restdocs</groupId> <artifactId>spring-restdocs-asciidoctor</artifactId> <version>${spring-restdocs.version}</version> </dependency> </dependencies> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <excludes> <exclude> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </exclude> </excludes> </configuration> </plugin> </plugins> </build> </project>
下面我们创建PaasController.java，编写一个接口，返回"Hello SpringBoot"，具体如下：
package com.example.paas; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class PaasController { @RequestMapping("/index") public String hello() { return "Hello,SpringBoot！"; } }
下来启动PaasApplication，启动后，就会输出如下的信息：
/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/bin/java -Dvisualvm.id=41606384211784 -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=63648:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_241.jdk/Contents/Home/lib/tools.jar:/Applications/code/workSpace/paas/target/classes:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-starter-web/2.5.1/spring-boot-starter-web-2.5.1.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-starter/2.5.1/spring-boot-starter-2.5.1.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot/2.5.1/spring-boot-2.5.1.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/2.5.1/spring-boot-autoconfigure-2.5.1.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-starter-logging/2.5.1/spring-boot-starter-logging-2.5.1.jar:/Users/liwangping/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar:/Users/liwangping/.m2/repository/ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar:/Users/liwangping/.m2/repository/org/apache/logging/log4j/log4j-to-slf4j/2.14.1/log4j-to-slf4j-2.14.1.jar:/Users/liwangping/.m2/repository/org/apache/logging/log4j/log4j-api/2.14.1/log4j-api-2.14.1.jar:/Users/liwangping/.m2/repository/org/slf4j/jul-to-slf4j/1.7.30/jul-to-slf4j-1.7.30.jar:/Users/liwangping/.m2/repository/jakarta/annotation/jakarta.annotation-api/1.3.5/jakarta.annotation-api-1.3.5.jar:/Users/liwangping/.m2/repository/org/yaml/snakeyaml/1.28/snakeyaml-1.28.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-starter-json/2.5.1/spring-boot-starter-json-2.5.1.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.12.3/jackson-databind-2.12.3.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/core/jackson-annotations/2.12.3/jackson-annotations-2.12.3.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/core/jackson-core/2.12.3/jackson-core-2.12.3.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jdk8/2.12.3/jackson-datatype-jdk8-2.12.3.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/datatype/jackson-datatype-jsr310/2.12.3/jackson-datatype-jsr310-2.12.3.jar:/Users/liwangping/.m2/repository/com/fasterxml/jackson/module/jackson-module-parameter-names/2.12.3/jackson-module-parameter-names-2.12.3.jar:/Users/liwangping/.m2/repository/org/springframework/boot/spring-boot-starter-tomcat/2.5.1/spring-boot-starter-tomcat-2.5.1.jar:/Users/liwangping/.m2/repository/org/apache/tomcat/embed/tomcat-embed-core/9.0.46/tomcat-embed-core-9.0.46.jar:/Users/liwangping/.m2/repository/org/apache/tomcat/embed/tomcat-embed-el/9.0.46/tomcat-embed-el-9.0.46.jar:/Users/liwangping/.m2/repository/org/apache/tomcat/embed/tomcat-embed-websocket/9.0.46/tomcat-embed-websocket-9.0.46.jar:/Users/liwangping/.m2/repository/org/springframework/spring-web/5.3.8/spring-web-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-beans/5.3.8/spring-beans-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-webmvc/5.3.8/spring-webmvc-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-aop/5.3.8/spring-aop-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-context/5.3.8/spring-context-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-expression/5.3.8/spring-expression-5.3.8.jar:/Users/liwangping/.m2/repository/org/projectlombok/lombok/1.18.20/lombok-1.18.20.jar:/Users/liwangping/.m2/repository/org/slf4j/slf4j-api/1.7.30/slf4j-api-1.7.30.jar:/Users/liwangping/.m2/repository/org/springframework/spring-core/5.3.8/spring-core-5.3.8.jar:/Users/liwangping/.m2/repository/org/springframework/spring-jcl/5.3.8/spring-jcl-5.3.8.jar com.example.paas.PaasApplication . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.5.1) 2021-06-16 22:24:37.411 INFO 25252 --- [ main] com.example.paas.PaasApplication : Starting PaasApplication using Java 1.8.0_241 on localhost with PID 25252 (/Applications/code/workSpace/paas/target/classes started by liwangping in /Applications/code/workSpace/paas) 2021-06-16 22:24:37.413 INFO 25252 --- [ main] com.example.paas.PaasApplication : No active profile set, falling back to default profiles: default 2021-06-16 22:24:38.256 INFO 25252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http) 2021-06-16 22:24:38.264 INFO 25252 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2021-06-16 22:24:38.265 INFO 25252 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.46] 2021-06-16 22:24:38.319 INFO 25252 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2021-06-16 22:24:38.319 INFO 25252 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 856 ms 2021-06-16 22:24:38.603 INFO 25252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '' 2021-06-16 22:24:38.612 INFO 25252 --- [ main] com.example.paas.PaasApplication : Started PaasApplication in 1.713 seconds (JVM running for 2.244)
默认的端口是8080，在PostMan访问http://localhost:8080/index，就会输出如下：
感谢您的阅读，后续会持续更新SpringBoot框架的技术栈知识体系！
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