IDEA15.4 以Spring Initializr形式搭建springboot 項目

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

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IDEA15.4 以Spring Initializr形式 搭建springboot 項目

IDEA15.4 以Spring Initializr形式搭建springboot 項目