Spring基础 快速入门spring boot（2） SPRING INITIALIZR
SPRING INITIALIZR是spring boot在构建项目时候非常有效, 虽然说Maven以及Spring boot提供的starter使用起来非常简单, 但是由于组件和关联部分众多,有这样一个可视化的配置构建管理工具仍然很不错. 在这篇文章中我们将会在IntelliJ IDEA中利用SPRING INITIALIZR来创建一个Hello World的例子程序, 不包括Maven下载的速度的话, 1分钟应该够了.
创建一个SPRING INITIALIZR项目
使用IntelliJ IDEA创建一个SPRING INITIALIZR类型的项目，除了选择web设定之外，一切全部Default。
选择Web
如果没有IntelliJ使用STS创建Starter类型的也是一样方便。二者都没有可以使用如下连接生成一个初始的项目zip包都是可以的。
项目详细
创建之后安静地等待Maven把所有的依赖全部下载下来。抽空看一下创建的内容。
可以看到，右侧代码区加亮部分正是SpringBoot的入口调用。
而左侧下方则是Maven辛辛苦苦替我们下载的内容。
Pom文件
Pom.xml文件如下所示
<?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>1.4.2.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>- 1
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可以在的pendency中清楚地看到我们加入的Web部分。
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>- 1
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修改DemoApplication
加入如下两行内容
@RequestMapping("/") public String Hello(){ return "Hello, Spring Boot..."; }- 1
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同时对DemoApplication加上RestController注解，修改后的source如下
package com.example;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@SpringBootApplicationpublic class DemoApplication { @RequestMapping("/") public String Hello(){ return "Hello, Spring Boot..."; } public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); }}- 1
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运行
右键运行即可
结果确认
运行起来后就可以在浏览器中查看结果了
Console输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.4.2.RELEASE)2016-12-03 08:57:58.888 INFO 5128 --- [ main] com.example.DemoApplication : Starting DemoApplication on vcc-PC with PID 5128 (C:\Users\Administrator\IdeaProjects\demo\target\classes started by Administrator in C:\Users\Administrator\IdeaProjects\demo)2016-12-03 08:57:58.891 INFO 5128 --- [ main] com.example.DemoApplication : No active profile set, falling back to default profiles: default2016-12-03 08:57:58.949 INFO 5128 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot[email protected]30ee2816: startup date [Sat Dec 03 08:57:58 CST 2016]; root of context hierarchy2016-12-03 08:58:00.512 INFO 5128 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2016-12-03 08:58:00.525 INFO 5128 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat2016-12-03 08:58:00.526 INFO 5128 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.62016-12-03 08:58:00.624 INFO 5128 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2016-12-03 08:58:00.624 INFO 5128 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1678 ms2016-12-03 08:58:00.740 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]2016-12-03 08:58:00.962 INFO 5128 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot[email protected]30ee2816: startup date [Sat Dec 03 08:57:58 CST 2016]; root of context hierarchy2016-12-03 08:58:01.018 INFO 5128 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.example.DemoApplication.Hello()2016-12-03 08:58:01.022 INFO 5128 --- [ 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)2016-12-03 08:58:01.022 INFO 5128 --- [ 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)2016-12-03 08:58:01.043 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.043 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.071 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.174 INFO 5128 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup2016-12-03 08:58:01.226 INFO 5128 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2016-12-03 08:58:01.230 INFO 5128 --- [ main] com.example.DemoApplication : Started DemoApplication in 2.751 seconds (JVM running for 3.109)2016-12-03 08:58:06.041 INFO 5128 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'2016-12-03 08:58:06.041 INFO 5128 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started2016-12-03 08:58:06.052 INFO 5128 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 11 ms- 1
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SPRING INITIALIZR是spring boot在构建项目时候非常有效, 虽然说Maven以及Spring boot提供的starter使用起来非常简单, 但是由于组件和关联部分众多,有这样一个可视化的配置构建管理工具仍然很不错. 在这篇文章中我们将会在IntelliJ IDEA中利用SPRING INITIALIZR来创建一个Hello World的例子程序, 不包括Maven下载的速度的话, 1分钟应该够了.
创建一个SPRING INITIALIZR项目
使用IntelliJ IDEA创建一个SPRING INITIALIZR类型的项目，除了选择web设定之外，一切全部Default。
选择Web
如果没有IntelliJ使用STS创建Starter类型的也是一样方便。二者都没有可以使用如下连接生成一个初始的项目zip包都是可以的。
项目详细
创建之后安静地等待Maven把所有的依赖全部下载下来。抽空看一下创建的内容。
可以看到，右侧代码区加亮部分正是SpringBoot的入口调用。
而左侧下方则是Maven辛辛苦苦替我们下载的内容。
Pom文件
Pom.xml文件如下所示
<?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>1.4.2.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>- 1
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- 50
可以在的pendency中清楚地看到我们加入的Web部分。
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>- 1
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- 3
- 4
修改DemoApplication
加入如下两行内容
@RequestMapping("/") public String Hello(){ return "Hello, Spring Boot..."; }- 1
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- 3
- 4
同时对DemoApplication加上RestController注解，修改后的source如下
package com.example;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@SpringBootApplicationpublic class DemoApplication { @RequestMapping("/") public String Hello(){ return "Hello, Spring Boot..."; } public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); }}- 1
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运行
右键运行即可
结果确认
运行起来后就可以在浏览器中查看结果了
Console输出
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.4.2.RELEASE)2016-12-03 08:57:58.888 INFO 5128 --- [ main] com.example.DemoApplication : Starting DemoApplication on vcc-PC with PID 5128 (C:\Users\Administrator\IdeaProjects\demo\target\classes started by Administrator in C:\Users\Administrator\IdeaProjects\demo)2016-12-03 08:57:58.891 INFO 5128 --- [ main] com.example.DemoApplication : No active profile set, falling back to default profiles: default2016-12-03 08:57:58.949 INFO 5128 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot[email protected]30ee2816: startup date [Sat Dec 03 08:57:58 CST 2016]; root of context hierarchy2016-12-03 08:58:00.512 INFO 5128 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2016-12-03 08:58:00.525 INFO 5128 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat2016-12-03 08:58:00.526 INFO 5128 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.62016-12-03 08:58:00.624 INFO 5128 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2016-12-03 08:58:00.624 INFO 5128 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1678 ms2016-12-03 08:58:00.740 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]2016-12-03 08:58:00.744 INFO 5128 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]2016-12-03 08:58:00.962 INFO 5128 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot[email protected]30ee2816: startup date [Sat Dec 03 08:57:58 CST 2016]; root of context hierarchy2016-12-03 08:58:01.018 INFO 5128 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.example.DemoApplication.Hello()2016-12-03 08:58:01.022 INFO 5128 --- [ 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)2016-12-03 08:58:01.022 INFO 5128 --- [ 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)2016-12-03 08:58:01.043 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.043 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.071 INFO 5128 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-12-03 08:58:01.174 INFO 5128 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup2016-12-03 08:58:01.226 INFO 5128 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2016-12-03 08:58:01.230 INFO 5128 --- [ main] com.example.DemoApplication : Started DemoApplication in 2.751 seconds (JVM running for 3.109)2016-12-03 08:58:06.041 INFO 5128 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'2016-12-03 08:58:06.041 INFO 5128 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started2016-12-03 08:58:06.052 INFO 5128 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 11 ms- 1
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