概述
相信對(duì)于java開發(fā)者而言，spring和springmvc兩個(gè)框架一定不陌生，這兩個(gè)框架需要我們手動(dòng)配置的地方非常多，各種的xml文件，properties文件，構(gòu)建一個(gè)項(xiàng)目還是挺復(fù)雜的，在這種情況下，springboot應(yīng)運(yùn)而生，他能夠快速的構(gòu)建spring項(xiàng)目，而且讓項(xiàng)目正常運(yùn)行起來的配置文件非常少，甚至只需要幾個(gè)注解就可以運(yùn)行整個(gè)項(xiàng)目。
總的說來，springboot項(xiàng)目可以打成jar包獨(dú)立運(yùn)行部署，因?yàn)樗鼉?nèi)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(jiǎn)化配置，當(dāng)然還有其他好多優(yōu)點(diǎn)，這里就不一一贅述，小伙伴們可以自行搜索解答。
簡(jiǎn)單項(xiàng)目構(gòu)建
工具
eclipse maven
首先，我們新建一個(gè)maven項(xiàng)目，在eclipse左側(cè)右擊選擇new----》other,選擇新建maven project
輸入group id，artifact id，點(diǎn)擊完成
這樣一個(gè)簡(jiǎn)單的項(xiàng)目架子就完成了，但是啥都沒有，項(xiàng)目結(jié)構(gòu)如下圖所示：
下面我們就開始配置搭建springboot項(xiàng)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(xiàng)目來獲得一些合理的默認(rèn)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(fù)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(xiàng)目的啟動(dòng)類，如下圖所示：
其中，控制器democontroller的內(nèi)容非常簡(jiǎn)單，內(nèi)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@slf4jpublic class democontroller { @postmapping("/demo") public void demotest() { // 這邊簡(jiǎn)單起見，打印一下日志 log.info("success call"); }} |
可能有些同學(xué)對(duì)其中的幾個(gè)注解有些疑問，我這邊簡(jiǎn)單說明下，
1.restcontroller
這個(gè)注解其實(shí)就是@responsebody ＋ @controller
2.postmapping
這個(gè)注解其實(shí)就是@requestmapping("xxxxxx", method=requestmethod.post)
這兩個(gè)其實(shí)都是組合注解，簡(jiǎn)化使用
我們?cè)賮砜纯?，?xiàng)目的啟動(dòng)類springbootdemoapplication的內(nèi)容：
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package com.cfxmn.springboot.springbootdemo;import org.springframework.boot.springapplication;import org.springframework.boot.autoconfigure.springbootapplication;@springbootapplicationpublic class springbootdemoapplication { public static void main(string[] args) { springapplication.run(springbootdemoapplication.class, args); }} |
是的，你沒看錯(cuò)，只要運(yùn)行這個(gè)main方法，就能啟動(dòng)這個(gè)spring項(xiàng)目，具體是怎么啟動(dòng)的容器，我們之后再分析，其實(shí)主要就是在注解springbootapplication上。
下面我們就來運(yùn)行下，看下啟動(dòng)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: default2018-10-25 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 hierarchy2018-10-25 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/8.5.162018-10-25 23:52:44.813 info 1700 --- [ost-startstop-1] o.a.c.c.c.[tomcat].[localhost].[/] : initializing spring embedded webapplicationcontext2018-10-25 23:52:44.813 info 1700 --- [ost-startstop-1] o.s.web.context.contextloader : root webapplicationcontext: initialization completed in 2733 ms2018-10-25 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 hierarchy2018-10-25 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 startup2018-10-25 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(dòng)日志標(biāo)黃的部分可以看出，項(xiàng)目啟動(dòng)成功了，訪問端口默認(rèn)是8080（這個(gè)端口是可以改動(dòng)的）
下面我們通過postman請(qǐng)求下，
查看控制臺(tái)
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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(diào)用成功。
到此，一個(gè)簡(jiǎn)單的springboot項(xiàng)目就構(gòu)建完成了，但這只是一個(gè)空的架子，內(nèi)容還可載豐富。
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.cnblogs.com/xiaobaobei/p/9853712.html
