作者：猪的快乐旅途_278 | 来源：互联网 | 2023-10-10 19:19
Spring boot的介绍我就不多说了，网上可以自己看一下。
它的优点就是：快！适合小白，没有复杂的配置文件。
缺点也很明显：坑有些多, 文档略少，报错有时不知道该如何处理。
下面做个最简单的入门：
首先使用maven来创建一个项目，jar即可。
假设工程名字为spring-boot
然后在pom.xml中添加如下配置：
<parent>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-parentartifactId>
<version>0.5.0.BUILD-SNAPSHOTversion>
parent>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
plugin>
plugins>
build>
<repositories>
<repository>
<id>spring-snapshotsid>
<url>http://repo.spring.io/snapshoturl>
<snapshots><enabled>trueenabled>snapshots>
repository>
<repository>
<id>spring-milestonesid>
<url>http://repo.spring.io/milestoneurl>
<snapshots><enabled>trueenabled>snapshots>
repository>
repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshotsid>
<url>http://repo.spring.io/snapshoturl>
pluginRepository>
<pluginRepository>
<id>spring-milestonesid>
<url>http://repo.spring.io/milestoneurl>
pluginRepository>
pluginRepositories>
之后我们创建一个controller：
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@EnableAutoConfiguration
public class SimpleController {
@RequestMapping(value ="/hello", method = RequestMethod.GET)
@ResponseBody
public String hello(){
return "hello world";
}
public static void main(String[] args) {
SpringApplication.run(SimpleController.class, args);
}
}
这个controller里有个main方法，看到没，我们直接运行即可，他会自动部署到tomcat或者jetty（8080端口不要被占用）。
然后在控制台你会看到：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.0.2.RELEASE)
2014-04-26 22:54:40.985 INFO 7236 --- [ main] c.r.spring.boot.SimpleController : Starting SimpleController on rollen with PID 7236 (D:\workspace\GitHub\SpringDemo\spring-boot\target\classes started by wenchao.ren in D:\workspace\GitHub\SpringDemo\spring-boot)
2014-04-26 22:54:41.008 INFO 7236 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@50de0926: startup date [Sat Apr 26 22:54:41 CST 2014]; root of context hierarchy
2014-04-26 22:54:41.583 INFO 7236 --- [ main] .t.TomcatEmbeddedServletContainerFactory : Server initialized with port: 8080
2014-04-26 22:54:41.706 INFO 7236 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2014-04-26 22:54:41.706 INFO 7236 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/7.0.52
2014-04-26 22:54:41.785 INFO 7236 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2014-04-26 22:54:41.785 INFO 7236 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 779 ms
2014-04-26 22:54:42.055 INFO 7236 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2014-04-26 22:54:42.057 INFO 7236 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2014-04-26 22:54:42.289 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-04-26 22:54:42.368 INFO 7236 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello],methods=[GET],params=[],headers=[],cOnsumes=[],produces=[],custom=[]}" onto public java.lang.String com.rollenholt.spring.boot.SimpleController.hello()
2014-04-26 22:54:42.376 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-04-26 22:54:42.377 INFO 7236 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-04-26 22:54:42.447 INFO 7236 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2014-04-26 22:54:42.459 INFO 7236 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080/http
2014-04-26 22:54:42.460 INFO 7236 --- [ main] c.r.spring.boot.SimpleController : Started SimpleController in 1.675 seconds (JVM running for 1.944)
2014-04-26 22:54:54.963 INFO 7236 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2014-04-26 22:54:54.963 INFO 7236 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2014-04-26 22:54:54.971 INFO 7236 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 8 ms
当然还有一种启动运行方式，就是通过@Configuration+@ComponentScan开启注解扫描并自动注册相应的注解Bean
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class);
}
}
启动完之后浏览器访问一下：http://localhost:8080/hello
就是这么快。
对于想学习/体验Spring的新手，快速建立项目模型等可以考虑用这种方式。
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