SpringBoot学习(四)-->SpringBoot快速入门,开山篇-白红宇

SpringBoot学习(四)-->SpringBoot快速入门,开山篇

阅读量：5129 次

发布时间：2019-06-13

本文共 9193 字，大约阅读时间需要 30 分钟。

Spring Boot简介

Spring Boot的目的在于创建和启动新的基于Spring框架的项目。Spring Boot会选择最适合的Spring子项目和第三方开源库进行整合。大部分Spring Boot应用只需要非常少的配置就可以快速运行起来

Spring Boot是伴随着Spring4.0诞生的，旨在简化开发。

Spring Boot提供了一种快速使用Spring的方式

SpringBoot官方文档：

>>Spring Boot特点

1：为基于Spring的开发提供更快的入门体验2：创建可以独立运行的Spring应用3：直接嵌入Tomcat或Jetty服务器，不需要打包成WAR文件4：提供推荐的基础POM文件（starter）来简化Apache Maven配置5：尽可能的根据项目依赖来自动配置Spring框架 6：Spring Boot使编码、配置、部署、监控变简单7：提供可以直接在生产环境中使用的功能，如性能指标、应用信息和应用健康检查8：开箱即用，没有代码生成，也无需XML配置。同时也可以修改默认值来满足特定的需求9：其他大量的项目都是基于Spring Boot之上的，如Spring Cloud

>>Spring Boot缺点

1：依赖太多，随便的一个Spring Boot应用都有好几十M2：缺少服务的注册和发现等解决方案3：缺少监控集成方案、安全管理方案4：中文的文档和资料太少且不够深入

>>Spring Boot应用场景

1：Spring能够应用的场景2：java web应用3：微服务

写个示例：Hello SpringBoot

1、创建Maven工程

工程结构如下：

2、配置pom.xml文件


         
      
       4.0.0
          
      
       com.mmzs
          
      
       springBoot00
          
      
       war
          
      
       0.0.1-SNAPSHOT
          
      
       springBoot00 Maven Webapp
          
      
       http://maven.apache.org
          
              
       
        org.springframework.boot
               
               
       
        spring-boot-starter-parent
               
       
        1.5.2.RELEASE
               
       
           
          
          
              
       
        UTF-8
               
               
       
        1.7
           
          
              
                   
                    
        
         org.springframework.boot
                    
        
         spring-boot-starter-web
                
           
          
              
       
        spring_boot
               
               
                   
        
         org.springframework.boot
                    
        
         spring-boot-maven-plugin

3、编写代码

1 package com.mmzs.springboot; 2   3 import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 import org.springframework.web.bind.annotation.RequestParam; 6 import org.springframework.web.bind.annotation.ResponseBody; 7 import org.springframework.web.bind.annotation.RestController; 8 import java.util.ArrayList; 9 import java.util.HashMap;10 import java.util.List;11 import java.util.Map;12  13 /**14  * Created by mmzs 2018年4月2日 11:50:5715  * springboot注解详解：http://www.cnblogs.com/mmzs/p/8874349.html16  */17 //用于标注控制层组件(如struts中的action)，@ResponseBody和@Controller的合集，18 //这样子获取的数据返回前台时也会自动转发为json格式。 19 @RestController20 //Spring Boot自动配置（auto-configuration）：尝试根据你添加的jar依赖自动配置你的Spring应用。21 @EnableAutoConfiguration22 public class HelloController {23  24     @RequestMapping("/hello")25     @ResponseBody //会使用详细转换器输出结果26     public String hello() {27         return "Hello Spring-Boot";28     }29  30     @RequestMapping("/info")31     public Map
      
        getInfo(@RequestParam String name) {32         Map
       
         map = new HashMap<>();33         map.put("name", name);34         return map;35     }36  37     @RequestMapping("/list")38     public List
        
         
          > getList() {39         List
          
           
            > list = new ArrayList<>();40 Map
            
              map = null;41 for (int i = 1; i <= 5; i++) {42 map = new HashMap<>();43 map.put("name", "mmzs+" + i);44 list.add(map);45 }46 return list;47 }48 }49

HelloController

1 package com.mmzs.springboot; 2  3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5  6 /** 7  * Created by mmzs 2018年4月2日 11:48:38 8  * springboot注解详解：http://www.cnblogs.com/mmzs/p/8874349.html 9  */10 //Spring Boot项目的核心注解，主要目的是开启自动配置。11 //包含了@ComponentScan、@Configuration和@EnableAutoConfiguration注解。12 //其中@ComponentScan默认扫描@SpringBootApplication所在类的同级目录以及它的子目录。13 @SpringBootApplication14 public class Application {15     public static void main(String[] args) {16         SpringApplication.run(Application.class, args);17     }18 }19

Application启动类

4、测试效果

运行Application类，结果如下：

.   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::        (v1.5.2.RELEASE)2018-07-02 12:17:03.434  INFO 5988 --- [           main] com.mmzs.springboot.Application          : Starting Application on CVHOPASEHFXPHFV with PID 5988 (D:\Project\springBoot00\target\classes started by Administrator in D:\Project\springBoot00)2018-07-02 12:17:03.442  INFO 5988 --- [           main] com.mmzs.springboot.Application          : No active profile set, falling back to default profiles: default2018-07-02 12:17:03.562  INFO 5988 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@27fe3806: startup date [Mon Jul 02 12:17:03 CST 2018]; root of context hierarchy2018-07-02 12:17:06.724  INFO 5988 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)2018-07-02 12:17:06.751  INFO 5988 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat2018-07-02 12:17:06.753  INFO 5988 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.112018-07-02 12:17:06.971  INFO 5988 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext2018-07-02 12:17:06.972  INFO 5988 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 3415 ms2018-07-02 12:17:07.260  INFO 5988 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]2018-07-02 12:17:07.266  INFO 5988 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]2018-07-02 12:17:07.267  INFO 5988 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2018-07-02 12:17:07.267  INFO 5988 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]2018-07-02 12:17:07.267  INFO 5988 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]2018-07-02 12:17:07.788  INFO 5988 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@27fe3806: startup date [Mon Jul 02 12:17:03 CST 2018]; root of context hierarchy2018-07-02 12:17:07.928  INFO 5988 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/list]}" onto public java.util.List
      
       
        > com.mmzs.springboot.HelloController.getList()2018-07-02 12:17:07.929  INFO 5988 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.mmzs.springboot.HelloController.hello()2018-07-02 12:17:07.931  INFO 5988 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/info]}" onto public java.util.Map
        
          com.mmzs.springboot.HelloController.getInfo(java.lang.String)2018-07-02 12:17:07.936  INFO 5988 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity
         
          
           > org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)2018-07-02 12:17:07.937  INFO 5988 --- [           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)2018-07-02 12:17:08.012  INFO 5988 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-07-02 12:17:08.013  INFO 5988 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-07-02 12:17:08.103  INFO 5988 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2018-07-02 12:17:08.403  INFO 5988 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup2018-07-02 12:17:08.531  INFO 5988 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)2018-07-02 12:17:08.538  INFO 5988 --- [           main] com.mmzs.springboot.Application          : Started Application in 5.736 seconds (JVM running for 6.592)