未測試過最新版本的IDEA的Spring Initializr內容是否更爲豐富?
Spring Boot是由Pivotal團隊提供的全新框架,其設計目的是用來簡化新Spring應用的初始搭建以及開發過程。該框架使用了特定的方式來進行配置,從而使開發人員不再需要定義樣板化的配置。通過這種方式,Boot致力於在蓬勃發展的快速應用開發領域(rapid application development)成爲領導者。
使用spring boot有什麼好處
其實就是簡單、快速、方便!平時如果我們需要搭建一個spring web項目的時候需要怎麼做呢?
1)配置web.xml,加載spring和spring mvc
2)配置數據庫連接、配置spring事務
3)配置加載配置文件的讀取,開啓註解
4)配置日誌文件
...
配置完成之後部署tomcat 調試
...
現在非常流行微服務,如果我這個項目僅僅只是需要發送一個郵件,如果我的項目僅僅是生產一個積分;我都需要這樣折騰一遍!
但是如果使用spring boot呢?
很簡單,我僅僅只需要非常少的幾個配置就可以迅速方便的搭建起來一套web項目或者是構建一個微服務!
1.創建一個新項目(Create New Project)
選擇 Spring Initializr,Project SDK 選擇 1.8,URL 填寫默認的,點擊 Next
2.繼續項目配置
Name:項目名稱
Type:我們是Maven構建的,那麼選擇第一個Maven Project
Packaging:打包類型,打包成Jar文件
Java Version:jdk版本,選擇1.8
Language:開發語言,選擇Java
Group:對應pom文件中的groupId,項目組織的唯一標識,對應Java包的結構
Artifact:對應pom文件的artifactId,項目唯一標識,對應項目名稱
Version:項目版本,對應pom文件的version
Description:項目描述,對應pom文件的description
Package:包名
3.Spring Boot 版本選擇,我這裏選擇了1.5.2,只要勾選Web下的web就可以了,然後Next
4.填寫項目名稱,項目存放的目錄,點擊 Finish
5.可以將下面這三個無關的文件刪除,乾淨結構
6.最後的項目結構
這裏看一下自動生成的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>1.5.2.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.新建一個Controller進行測試
@RestController
public class HelloController {
@RequestMapping(value = "/hello")
public String hello() {
return "hello,Spring Boot";
}
}
@RestController的意思就是controller裏面的方法都以json格式輸出,不用再寫什麼jackjson配置的了!
整個項目的啓動類就是上面的DemoApplication
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
8.啓動成功信息,端口8080
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.5.3.RELEASE) 2017-04-24 01:29:17.293 INFO 19480 --- [ restartedMain] com.example.DemoApplication : Starting DemoApplication on DESKTOP-4U9C0CH with PID 19480 (D:\IdeaProjects\test\demo\target\classes started by winner_0715 in D:\IdeaProjects\test\demo) 2017-04-24 01:29:17.295 INFO 19480 --- [ restartedMain] com.example.DemoApplication : No active profile set, falling back to default profiles: default 2017-04-24 01:29:17.432 INFO 19480 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1f5f2168: startup date [Mon Apr 24 01:29:17 CST 2017]; root of context hierarchy 2017-04-24 01:29:21.450 INFO 19480 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2017-04-24 01:29:21.493 INFO 19480 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service Tomcat 2017-04-24 01:29:21.495 INFO 19480 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.14 2017-04-24 01:29:21.820 INFO 19480 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2017-04-24 01:29:21.820 INFO 19480 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 4396 ms 2017-04-24 01:29:22.136 INFO 19480 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2017-04-24 01:29:22.149 INFO 19480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2017-04-24 01:29:22.150 INFO 19480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2017-04-24 01:29:22.150 INFO 19480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2017-04-24 01:29:22.151 INFO 19480 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2017-04-24 01:29:22.642 INFO 19480 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1f5f2168: startup date [Mon Apr 24 01:29:17 CST 2017]; root of context hierarchy 2017-04-24 01:29:22.785 INFO 19480 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/index]}" onto public java.util.Map<java.lang.String, java.lang.String> com.example.test.IndexController.test(java.lang.String) 2017-04-24 01:29:22.791 INFO 19480 --- [ restartedMain] 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) 2017-04-24 01:29:22.792 INFO 19480 --- [ restartedMain] 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) 2017-04-24 01:29:22.896 INFO 19480 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-04-24 01:29:22.896 INFO 19480 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-04-24 01:29:22.963 INFO 19480 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-04-24 01:29:23.250 INFO 19480 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729 2017-04-24 01:29:23.351 INFO 19480 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2017-04-24 01:29:23.492 INFO 19480 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2017-04-24 01:29:23.507 INFO 19480 --- [ restartedMain] com.example.DemoApplication : Started DemoApplication in 6.736 seconds (JVM running for 7.717)
9.到瀏覽器中輸入 http://localhost:8080/hello
上面講的打包方式是jar,試了一下war的打包方式,生成的目錄結構是這樣的