Spring boot (1)--- 第一个应用程序helloworld

1. File -->new-->maven project 创建项目。项目工程如下：

2： pom 文件如下：

<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.zyzx.sample</groupId>
<artifactId>ch1.helloworld</artifactId>
<version>0.0.1-SNAPSHOT</version>

<parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>2.0.0.RELEASE</version>
       <relativePath/> 
   </parent>

<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>

3. 创建 Ch1Application

package com.zyzx.sample.ch1类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Ch1Application {
   public static void main(String[] args) {

       SpringApplication.run(Ch1Application.class, args);
   }

}

4. 创建controller 类

package com.zyzx.sample.ch1.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class HelloWorldController {

   @RequestMapping("/say.html")

   public @ResponseBody String say() {
       return "hello spring boot!";

   }

}
@controller 是SpringMVC的注解，表示此类用于负责处理web的请求。

@RequestMapping 是SpringMVC的注解，表示如果请求路径匹配，被注解的方法将被被调用。

@ResponseBody 表示返回的是文本，而不是视图名称

运行程序：. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.0.RELEASE)

2018-11-03 22:26:15.049 INFO 9292 --- [ main] com.zyzx.sample.ch1.Ch1Application : Starting Ch1Application on CC4 with PID 9292 (D:\eclipse-workspace-ee\ch1.helloworld\target\classes started by zhangbijun in D:\eclipse-workspace-ee\ch1.helloworld)
2018-11-03 22:26:15.054 INFO 9292 --- [ main] com.zyzx.sample.ch1.Ch1Application : No active profile set, falling back to default profiles: default
2018-11-03 22:26:15.141 INFO 9292 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4c40b76e: startup date [Sat Nov 03 22:26:15 CST 2018]; root of context hierarchy
2018-11-03 22:26:16.996 INFO 9292 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-03 22:26:17.035 INFO 9292 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-03 22:26:17.036 INFO 9292 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.28
2018-11-03 22:26:17.051 INFO 9292 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_181\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_181/bin/server;C:/Program Files/Java/jre1.8.0_181/bin;C:/Program Files/Java/jre1.8.0_181/lib/amd64;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x64;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Java\jdk1.8.0_181\bin;C:\Program Files\Java\jdk1.8.0_181\jre\bin;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\adb;D:\spring_boot\apache-maven-3.5.4/bin;D:\nodejs\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Users\Administrator\AppData\Roaming\npm;C:\Users\Administrator\Desktop;;.]
2018-11-03 22:26:17.216 INFO 9292 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-03 22:26:17.216 INFO 9292 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2078 ms
2018-11-03 22:26:17.380 INFO 9292 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-03 22:26:17.385 INFO 9292 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-03 22:26:17.385 INFO 9292 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-03 22:26:17.385 INFO 9292 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-11-03 22:26:17.385 INFO 9292 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-03 22:26:17.786 INFO 9292 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4c40b76e: startup date [Sat Nov 03 22:26:15 CST 2018]; root of context hierarchy
2018-11-03 22:26:17.877 INFO 9292 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/say.html]}" onto public java.lang.String com.zyzx.sample.ch1.controller.HelloWorldController.say()
2018-11-03 22:26:17.886 INFO 9292 --- [ 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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-11-03 22:26:17.887 INFO 9292 --- [ 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.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-11-03 22:26:17.926 INFO 9292 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-03 22:26:17.926 INFO 9292 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-03 22:26:17.970 INFO 9292 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-11-03 22:26:18.148 INFO 9292 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-11-03 22:26:18.239 INFO 9292 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-03 22:26:18.244 INFO 9292 --- [ main] com.zyzx.sample.ch1.Ch1Application : Started Ch1Application in 3.627 seconds (JVM running for 4.218)
2018-11-03 22:28:29.662 INFO 9292 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-11-03 22:28:29.662 INFO 9292 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-11-03 22:28:29.681 INFO 9292 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 19 ms

5.打开浏览器，输入 http://localhost:8080/say.html

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