概述
相信對于java開發者而言,spring和springmvc兩個框架一定不陌生,這兩個框架需要我們手動配置的地方非常多,各種的xml文件,properties文件,構建一個項目還是挺復雜的,在這種情況下,springboot應運而生,他能夠快速的構建spring項目,而且讓項目正常運行起來的配置文件非常少,甚至只需要幾個注解就可以運行整個項目。
總的說來,springboot項目可以打成jar包獨立運行部署,因為它內嵌servlet容器,之前spring,springmvc需要的大量依賴,可以通過starter來幫助我們簡化配置,當然還有其他好多優點,這里就不一一贅述,小伙伴們可以自行搜索解答。
簡單項目構建
工具
eclipse maven
首先,我們新建一個maven項目,在eclipse左側右擊選擇new----》other,選擇新建maven project
輸入group id,artifact id,點擊完成
這樣一個簡單的項目架子就完成了,但是啥都沒有,項目結構如下圖所示:
下面我們就開始配置搭建springboot項目。
1.添加依賴
完整porm代碼如下:
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<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.cfxmn.springboot</groupid> <artifactid>springbootdemo</artifactid> <version> 0.0 . 1 -snapshot</version> <packaging>jar</packaging> <!-- 通過繼承spring-boot-starter-parent項目來獲得一些合理的默認配置 --> <parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version> 1.5 . 6 .release</version> </parent> <properties> <project.build.sourceencoding>utf- 8 </project.build.sourceencoding> </properties> <dependencies> <!-- spring boot web 依賴 --> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency> <!-- spring boot test 依賴 --> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-test</artifactid> <scope>test</scope> </dependency> <!-- 使用lombok可以減少很多重復代碼的書寫。比如說getter/setter/tostring等方法的編寫 --> <dependency> <groupid>org.projectlombok</groupid> <artifactid>lombok</artifactid> </dependency> </dependencies> </project> |
下面我們新建一些包和添加項目的啟動類,如下圖所示:
其中,控制器democontroller的內容非常簡單,內容如下:
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package com.cfxmn.springboot.springbootdemo.controller; import org.springframework.web.bind.annotation.postmapping; import org.springframework.web.bind.annotation.restcontroller; import lombok.extern.slf4j.slf4j; @restcontroller @slf4j public class democontroller { @postmapping ( "/demo" ) public void demotest() { // 這邊簡單起見,打印一下日志 log.info( "success call" ); } } |
可能有些同學對其中的幾個注解有些疑問,我這邊簡單說明下,
1.restcontroller
這個注解其實就是@responsebody + @controller
2.postmapping
這個注解其實就是@requestmapping("xxxxxx", method=requestmethod.post)
這兩個其實都是組合注解,簡化使用
我們再來看看,項目的啟動類springbootdemoapplication的內容:
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package com.cfxmn.springboot.springbootdemo; import org.springframework.boot.springapplication; import org.springframework.boot.autoconfigure.springbootapplication; @springbootapplication public class springbootdemoapplication { public static void main(string[] args) { springapplication.run(springbootdemoapplication. class , args); } } |
是的,你沒看錯,只要運行這個main方法,就能啟動這個spring項目,具體是怎么啟動的容器,我們之后再分析,其實主要就是在注解springbootapplication上。
下面我們就來運行下,看下啟動日志:
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. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | ' _| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: spring boot :: (v1. 5.6 .release) 2018 - 10 - 25 23 : 52 : 41.985 info 1700 --- [ main] c.c.s.s.springbootdemoapplication : starting springbootdemoapplication on desktop-kb78hjk with pid 1700 (e:\workspace\springbootdemo\target\classes started by gepengfa in e:\workspace\springbootdemo) 2018 - 10 - 25 23 : 52 : 41.990 info 1700 --- [ main] c.c.s.s.springbootdemoapplication : no active profile set, falling back to default profiles: default 2018 - 10 - 25 23 : 52 : 42.088 info 1700 --- [ main] ationconfigembeddedwebapplicationcontext : refreshing org.springframework.boot.context.embedded.annotationconfigembeddedwebapplicationcontext @7f416310 : startup date [thu oct 25 23 : 52 : 42 cst 2018 ]; root of context hierarchy 2018 - 10 - 25 23 : 52 : 44.561 info 1700 --- [ main] s.b.c.e.t.tomcatembeddedservletcontainer : tomcat initialized with port(s): 8080 (http) 2018 - 10 - 25 23 : 52 : 44.584 info 1700 --- [ main] o.apache.catalina.core.standardservice : starting service [tomcat] 2018 - 10 - 25 23 : 52 : 44.588 info 1700 --- [ main] org.apache.catalina.core.standardengine : starting servlet engine: apache tomcat/ 8.5 . 16 2018 - 10 - 25 23 : 52 : 44.813 info 1700 --- [ost-startstop- 1 ] o.a.c.c.c.[tomcat].[localhost].[/] : initializing spring embedded webapplicationcontext 2018 - 10 - 25 23 : 52 : 44.813 info 1700 --- [ost-startstop- 1 ] o.s.web.context.contextloader : root webapplicationcontext: initialization completed in 2733 ms 2018 - 10 - 25 23 : 52 : 45.074 info 1700 --- [ost-startstop- 1 ] o.s.b.w.servlet.servletregistrationbean : mapping servlet: 'dispatcherservlet' to [/] 2018 - 10 - 25 23 : 52 : 45.083 info 1700 --- [ost-startstop- 1 ] o.s.b.w.servlet.filterregistrationbean : mapping filter: 'characterencodingfilter' to: [ /*] 2018-10-25 23:52:45.083 info 1700 --- [ost-startstop-1] o.s.b.w.servlet.filterregistrationbean : mapping filter: 'hiddenhttpmethodfilter' to: [/*] 2018-10-25 23:52:45.083 info 1700 --- [ost-startstop-1] o.s.b.w.servlet.filterregistrationbean : mapping filter: 'httpputformcontentfilter' to: [/*] 2018-10-25 23:52:45.085 info 1700 --- [ost-startstop-1] o.s.b.w.servlet.filterregistrationbean : mapping filter: 'requestcontextfilter' to: [/*] 2018-10-25 23:52:45.582 info 1700 --- [ main] s.w.s.m.m.a.requestmappinghandleradapter : looking for @controlleradvice: org.springframework.boot.context.embedded.annotationconfigembeddedwebapplicationcontext@7f416310: startup date [thu oct 25 23:52:42 cst 2018]; root of context hierarchy 2018-10-25 23:52:45.705 info 1700 --- [ main] s.w.s.m.m.a.requestmappinghandlermapping : mapped "{[/demo],methods=[post]}" onto public void com.cfxmn.springboot.springbootdemo.controller.democontroller.demotest() 2018-10-25 23:52:45.710 info 1700 --- [ 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) 2018-10-25 23:52:45.711 info 1700 --- [ 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) 2018-10-25 23:52:45.759 info 1700 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.resourcehttprequesthandler] 2018-10-25 23:52:45.759 info 1700 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/**] onto handler of type [class org.springframework.web.servlet.resource.resourcehttprequesthandler] 2018-10-25 23:52:45.817 info 1700 --- [ main] o.s.w.s.handler.simpleurlhandlermapping : mapped url path [/**/ favicon.ico] onto handler of type [ class org.springframework.web.servlet.resource.resourcehttprequesthandler] 2018 - 10 - 25 23 : 52 : 46.321 info 1700 --- [ main] o.s.j.e.a.annotationmbeanexporter : registering beans for jmx exposure on startup 2018 - 10 - 25 23 : 52 : 46.529 info 1700 --- [ main] s.b.c.e.t.tomcatembeddedservletcontainer : tomcat started on port(s): 8080 (http) 2018 - 10 - 25 23 : 52 : 46.599 info 1700 --- [ main] c.c.s.s.springbootdemoapplication : started springbootdemoapplication in 5.092 seconds (jvm running for 5.764 ) |
從啟動日志標黃的部分可以看出,項目啟動成功了,訪問端口默認是8080(這個端口是可以改動的)
下面我們通過postman請求下,
查看控制臺
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2018 - 10 - 25 23 : 59 : 26.385 info 1700 --- [nio- 8080 -exec- 2 ] c.c.s.s.controller.democontroller : success call |
說明調用成功。
到此,一個簡單的springboot項目就構建完成了,但這只是一個空的架子,內容還可載豐富。
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持服務器之家。
原文鏈接:http://www.cnblogs.com/xiaobaobei/p/9853712.html