SpringBoot入门案例

1.导jar包（配置pom.xml 文件）

<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/maven-v4_0_0.xsd">    <modelVersion>4.0.0</modelVersion>    <artifactId>SpringBoot01</artifactId>    <packaging>war</packaging>    <name>SpringBoot01 Maven Webapp</name>    <url>http://maven.apache.org</url>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.3.4.RELEASE</version>    </parent>    <dependencies>        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>1.0.0</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid</artifactId>            <version>1.0.18</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.41</version>        </dependency>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>3.8.1</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>springloaded</artifactId>            <version>1.2.5.RELEASE</version>        </dependency>        <dependency>            <!-- Import dependency management from Spring Boot -->            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-dependencies</artifactId>            <version>1.2.5.RELEASE</version>            <type>pom</type>            <scope>import</scope>        </dependency>    </dependencies>    <properties>        <java.version>1.8</java.version>    </properties>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>                <dependencies>                    <dependency>                        <groupId>org.springframework</groupId>                        <artifactId>springloaded</artifactId>                        <version>1.2.5.RELEASE</version>                    </dependency>                </dependencies>            </plugin>        </plugins>    </build></project>

2.编写测试类代码

package cn.bdqn.demo1;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Configuration;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;/** * Created by guo on 2017/9/17. */@Controller@SpringBootApplication   //说明这是springboot的一个应用@Configuration   //自身就是一个配置public class DemoApplication {    @ResponseBody    @RequestMapping("demo1")    public String say(){        return "Hellow World !!!";    }    public static void main(String[] args) {        SpringApplication.run(DemoApplication.class,args);    }}

执行后，控制台输出

 .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.4.RELEASE)


2017-09-17 15:14:50.355  INFO 51696 --- [           main] cn.bdqn.demo1.DemoApplication            : Starting DemoApplication on DESKTOP-82GFLEM with PID 51696 (E:\Maven01\SpringBoot01\target\classes started by guo in E:\Maven01)
2017-09-17 15:14:50.358  INFO 51696 --- [           main] cn.bdqn.demo1.DemoApplication            : No active profile set, falling back to default profiles: default
2017-09-17 15:14:50.397  INFO 51696 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1416310: startup date [Sun Sep 17 15:14:50 CST 2017]; root of context hierarchy
2017-09-17 15:14:50.918  WARN 51696 --- [           main] o.m.s.mapper.ClassPathMapperScanner      : No MyBatis mapper was found in '[cn.bdqn.demo1]' package. Please check your configuration.
2017-09-17 15:14:51.127  INFO 51696 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$16a6ef2f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-09-17 15:14:51.550  INFO 51696 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-09-17 15:14:51.565  INFO 51696 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-09-17 15:14:51.566  INFO 51696 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.33
2017-09-17 15:14:51.650  INFO 51696 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-09-17 15:14:51.650  INFO 51696 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1255 ms
2017-09-17 15:14:51.858  INFO 51696 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]
2017-09-17 15:14:51.861  INFO 51696 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-09-17 15:14:51.862  INFO 51696 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-09-17 15:14:51.862  INFO 51696 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-09-17 15:14:51.862  INFO 51696 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'requestContextFilter' to: [/*]
2017-09-17 15:14:52.057  INFO 51696 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1416310: startup date [Sun Sep 17 15:14:50 CST 2017]; root of context hierarchy
2017-09-17 15:14:52.153  INFO 51696 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/demo1]}" onto public java.lang.String cn.bdqn.demo1.DemoApplication.say()
2017-09-17 15:14:52.155  INFO 51696 --- [           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)
2017-09-17 15:14:52.155  INFO 51696 --- [           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)
2017-09-17 15:14:52.172  INFO 51696 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-17 15:14:52.172  INFO 51696 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-17 15:14:52.200  INFO 51696 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-09-17 15:14:52.449  INFO 51696 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-09-17 15:14:52.508  INFO 51696 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-09-17 15:14:52.510  INFO 51696 --- [           main] cn.bdqn.demo1.DemoApplication            : Started DemoApplication in 2.4 seconds (JVM running for 2.703)