我想,現在企業級的Java web項目應該或多或少都會使用到Spring框架的。
回首我們以前使用Spring框架的時候,我們需要首先在(如果你使用Maven的話)pom文件中增加對相關的的依賴(使用gradle來構建的話基本也一樣)然后新建Spring相關的xml文件,而且往往那些xml文件還不會少。然后繼續使用tomcat或者jetty作為容器來運行這個工程。基本上每次創建一個新的項目都是這么一個流程,而我們有時候僅僅想快速的創建一個Spring web工程來測試一些東西,或者是希望能節省時間。
現在我們使用Spring Boot就可以快速的做到這些了。
我們先來看一個非常簡單的使用Spring boot的例子吧:
1. 我們創建一個Maven工程,假定工程名字為spring-boot,然后我們在pom.xml文件中加入依賴:
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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>
1.0
.
2
.RELEASE</version>
</dependency>
|
2. 新建一個Controller來接受處理我們的請求:
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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;
/**
* Created by wenchao.ren on 2014/4/26.
*/
@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);
}
}
|
相信大家已經看到了這個Controller有一個main方法,不要急,我們直接運行這個main方法:
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. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ |
'_ | '
_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.
0.2
.RELEASE)
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-
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()
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-
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
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-
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
|
會產生上面的輸出,查看日志可以發現默認使用的是tomcat,端口綁定在8080,現在讓我們來訪問:http://localhost:8080/hello
就可以看到我們代碼中輸出的字樣:hello world了。
回首這個過程,是不是相比於以前快速了許多呢
設置tomcat端口號:
修改默認配置
Spring Boot默認配置文件為CLASSPATH下的application.properties
在application.properties中添加server.port=8011,可將tomcat默認端口號修改為8011