我的第一篇博客spring boot学习

spring boot最近貌似很火，号称（微服务）.....不多说了上代码

看了很多篇博客，大都差不多，总结了下有几个注意的地方下面说明。

首先项目用maven构建。

先来看下目录结构

一、pom.xml（很关键）

<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</groupId>    <artifactId>mySpringBoot</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>mySpringBoot</name>    <url>http://maven.apache.org</url>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </properties>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.3.0.RELEASE</version>    </parent>    <dependencies>        <!--springboot依赖-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-jetty</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>            <exclusions>                <exclusion>                    <groupId>org.springframework.boot</groupId>                    <artifactId>spring-boot-starter-tomcat</artifactId>                </exclusion>            </exclusions>        </dependency>        <!--springboot依赖-->        <!-- 模板引擎 类似jstl 更适合html5 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-thymeleaf</artifactId>        </dependency>        <!-- spring热部署 -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>springloaded</artifactId>        </dependency>                <!--springboot修改代码立即生效--><!--调试的时候方便不加的话每次需要重启运行Application.java-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <configuration>                    <source>1.7</source>                    <target>1.7</target>                    <encoding>utf8</encoding>                </configuration>            </plugin>        </plugins>    </build></project>

二、启动类Application.java

package mySpringBoot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;//@Configuration  //@ComponentScan //@EnableAutoConfiguration//自动配置  @SpringBootApplication//和上面的三个注解作用相同public class Application {public static void main(String[] args) throws Exception {SpringApplication.run(Application.class, args);}}

直接运行main方法启动，这里卡了好久报个各种错误（具体情况以后再补充），启动成功如下

 .   ____          _            __ _ _ /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/  ___)| |_)| | | | | || (_| |  ) ) ) )  '  |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot ::        (v1.3.0.RELEASE)2016-09-20 19:17:33.800  INFO 31607 --- [  restartedMain] mySpringBoot.Application                 : Starting Application on jcz-Latitude-3550 with PID 31607 (/home/jcz/workspace/mySpringBoot/target/classes started by jcz in /home/jcz/workspace/mySpringBoot)2016-09-20 19:17:33.805  INFO 31607 --- [  restartedMain] mySpringBoot.Application                 : No profiles are active2016-09-20 19:17:34.295  INFO 31607 --- [  restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@678b18dd: startup date [Tue Sep 20 19:17:34 CST 2016]; root of context hierarchy2016-09-20 19:17:36.076  INFO 31607 --- [  restartedMain] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]2016-09-20 19:17:37.071  INFO 31607 --- [  restartedMain] e.j.JettyEmbeddedServletContainerFactory : Server initialized with port: 80802016-09-20 19:17:37.078  INFO 31607 --- [  restartedMain] org.eclipse.jetty.server.Server          : jetty-9.2.14.v201511062016-09-20 19:17:37.267  INFO 31607 --- [  restartedMain] application                              : Initializing Spring embedded WebApplicationContext2016-09-20 19:17:37.267  INFO 31607 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2974 ms2016-09-20 19:17:37.990  INFO 31607 --- [  restartedMain] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/]2016-09-20 19:17:37.993  INFO 31607 --- [  restartedMain] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*]2016-09-20 19:17:37.993  INFO 31607 --- [  restartedMain] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]2016-09-20 19:17:37.994  INFO 31607 --- [  restartedMain] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'httpPutFormContentFilter' to: [/*]2016-09-20 19:17:37.994  INFO 31607 --- [  restartedMain] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'requestContextFilter' to: [/*]2016-09-20 19:17:38.293  INFO 31607 --- [  restartedMain] o.e.jetty.server.handler.ContextHandler  : Started o.s.b.c.e.j.JettyEmbeddedWebAppContext@745e6f01{/,file:/tmp/jetty-docbase.2885017018384146467.8080/,AVAILABLE}2016-09-20 19:17:38.294  INFO 31607 --- [  restartedMain] org.eclipse.jetty.server.Server          : Started @6514ms2016-09-20 19:17:38.482  INFO 31607 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@678b18dd: startup date [Tue Sep 20 19:17:34 CST 2016]; root of context hierarchy2016-09-20 19:17:38.591  INFO 31607 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/action2]}" onto public java.lang.String mySpringBoot.action.Action2.hello(org.springframework.ui.Model)2016-09-20 19:17:38.593  INFO 31607 --- [  restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/action1]}" onto public java.lang.String mySpringBoot.action.Action1.action1()2016-09-20 19:17:38.600  INFO 31607 --- [  restartedMain] 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)2016-09-20 19:17:38.601  INFO 31607 --- [  restartedMain] 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)2016-09-20 19:17:38.658  INFO 31607 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-09-20 19:17:38.658  INFO 31607 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-09-20 19:17:38.749  INFO 31607 --- [  restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]2016-09-20 19:17:39.580  INFO 31607 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 357292016-09-20 19:17:39.700  INFO 31607 --- [  restartedMain] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup2016-09-20 19:17:39.732  INFO 31607 --- [  restartedMain] application                              : Initializing Spring FrameworkServlet 'dispatcherServlet'2016-09-20 19:17:39.732  INFO 31607 --- [  restartedMain] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started2016-09-20 19:17:39.764  INFO 31607 --- [  restartedMain] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 32 ms2016-09-20 19:17:39.869  INFO 31607 --- [  restartedMain] o.eclipse.jetty.server.ServerConnector   : Started ServerConnector@52d2343d{HTTP/1.1}{0.0.0.0:8080}2016-09-20 19:17:39.872  INFO 31607 --- [  restartedMain] .s.b.c.e.j.JettyEmbeddedServletContainer : Jetty started on port(s) 8080 (http/1.1)2016-09-20 19:17:39.881  INFO 31607 --- [  restartedMain] mySpringBoot.Application                 : Started Application in 7.515 seconds (JVM running for 8.101)

三、写一个Action代码

package mySpringBoot.action;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController//是Controller的一种，HTTP Response的Body部分返回给浏览器@EnableAutoConfigurationpublic class Action1 {@RequestMapping("/action1")public String action1() {return "Hello SpringBoot action1";}}

好，接下来再写一个跳页面的Action

package mySpringBoot.action;import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic class Action2 {    @RequestMapping("/action2")public String hello(Model model) {    Map<String,Object> map=new HashMap<String,Object>();map.put("id", 1);map.put("name", "赵六");map.put("job","java coding man");    model.addAttribute("map", map);    model.addAttribute("message", "你好");            return "hello";//跳转到hello页面}}

这里跳的不是jsp了，而是html5，请看pom引入了thymeleaf，好不多说，看页面代码

<!DOCTYPE HTML><html xmlns:th="http://www.thymeleaf.org"><head>    <title>Getting Started: Serving Web Content</title>    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body>    <p th:text="'Hello, ' + ${map.name} + '!'" />    <p th:text="${map.id}+${map.name}+${map.job}" /></body></html>

是不是和jstl很像！！嘻嘻

到这里很容易就跑起来了spring项目了。

我启动时的错，引入tomcat目录bin下的tomcat-juli.jar启动成功。

有的错误还和pom.xml里的spring boot版本有关，具体的还待研究（也是群里各种问）。

注意：1、Application.java这个类所在位置要在最外层，这样才能spring扫描到它下面的所有action、serveice、dao等最后毕竟是最近比较火，有些不稳定莫名其妙报错写到这里，待续......