SpringBoot 学习笔记

        最近难得又轻松了点，也就有时间看一下一直想看的SpringBoot和Dubbo+zk，考虑了下，先从SpringBoot开始：

        上官方文档：https://docs.spring.io/spring-boot/docs/2.0.0.M1/reference/htmlsingle/

         这是我比较喜欢的类型

      这里选择了一个比较适中的版本1.5.0.RELEASE

          By default, Spring Boot 1.5.0.RELEASE requires Java 7 andSpring Framework 4.3.6.RELEASE or above. You can use Spring Boot with Java 6 with someadditional configuration. SeeSection 84.11, “How to use Java 6” for more details. Explicitbuild support is provided forMaven (3.2+), and Gradle 2 (2.9 or later) and 3.

我的IDE是MyEclipse2014，不推荐使用，感觉太重了，然后环境为：

JDK8

Tomcat8

apache-maven-3.3.9

1、首先我新建了一个项目，天生带着小红叉，但是用tomcat跑了下，正常。

         

2、pom中引入相关类库：

<?xml version="1.0" encoding="UTF-8"?>
<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.example</groupId>
    <artifactId>myproject</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <!-- Inherit defaults from Spring Boot -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.0.RELEASE</version>
    </parent>

    <!-- Add typical dependencies for a web application -->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <!-- Package as an executable jar -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3、官网这一步让安装 Boot CLI，应该是类似终端的东西：spring-boot-cli-1.5.0.RELEASE-bin.zip

下完之后打开闪退，按照install。txt的提示，将下载的cli配置到环境变量

4、又让安装SDKMAN，包含 Groovy and the Spring Boot CLI.不装了，骗子

===============================================================================================================================

5、随便找个博客（以下两个类抄自右边博客）：http://blog.csdn.net/lxhjh/article/details/51711148

创建启动类（http://blog.csdn.net/lxhjh/article/details/51711148）：

@SpringBootApplication  
public class Application {  
  
    public static void main(String[] args) {  
        SpringApplication.run(Application.class, args);  
    }  
}  

创建控制层类（http://blog.csdn.net/lxhjh/article/details/51711148）：

@RestController  
@EnableAutoConfiguration  
public class Example {  
      
    @RequestMapping("/")  
    String home() {  
        return "Hello World!";  
    }  
      
    @RequestMapping("/hello/{myName}")  
    String index(@PathVariable String myName) {  
        return "Hello "+myName+"!!!";  
    }  
} 

运行

Application 类中的main方法：》》一下是启动日志：

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _    
( ( )\___ | '_ | '_| | '_ / _` |    
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.0.RELEASE)

2017-12-12 18:00:27.019  INFO 4036 --- [           main] Application.Application                  : Starting Application on PC-20161217LDRA with PID 4036 (E:WorkspaceTestTestBoot	argetclasses started by Administrator in E:WorkspaceTestTestBoot)
2017-12-12 18:00:27.019  INFO 4036 --- [           main] Application.Application                  : No active profile set, falling back to default profiles: default
2017-12-12 18:00:27.079  INFO 4036 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@21e360a: startup date [Tue Dec 12 18:00:27 CST 2017]; root of context hierarchy
2017-12-12 18:00:28.045  INFO 4036 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration' of type [class org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-12-12 18:00:28.126  INFO 4036 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'validator' of type [class org.springframework.validation.beanvalidation.LocalValidatorFactoryBean] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-12-12 18:00:28.536  INFO 4036 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-12-12 18:00:28.556  INFO 4036 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2017-12-12 18:00:28.556  INFO 4036 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.47
2017-12-12 18:00:28.838  INFO 4036 --- [ost-startStop-1] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2017-12-12 18:00:28.848  INFO 4036 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-12-12 18:00:28.848  INFO 4036 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1769 ms
2017-12-12 18:00:29.010  INFO 4036 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-12 18:00:29.020  INFO 4036 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-12-12 18:00:29.020  INFO 4036 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-12-12 18:00:29.020  INFO 4036 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-12-12 18:00:29.020  INFO 4036 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-12-12 18:00:29.406  INFO 4036 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@21e360a: startup date [Tue Dec 12 18:00:27 CST 2017]; root of context hierarchy
2017-12-12 18:00:29.477  INFO 4036 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello/{myName}]}" onto java.lang.String Application.Example.index(java.lang.String)
2017-12-12 18:00:29.477  INFO 4036 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto java.lang.String Application.Example.home()
2017-12-12 18:00:29.487  INFO 4036 --- [           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)
2017-12-12 18:00:29.487  INFO 4036 --- [           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)
2017-12-12 18:00:29.527  INFO 4036 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-12 18:00:29.527  INFO 4036 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-12 18:00:29.567  INFO 4036 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-12 18:00:29.847  INFO 4036 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2017-12-12 18:00:29.967  INFO 4036 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-12-12 18:00:29.972  INFO 4036 --- [           main] Application.Application                  : Started Application in 3.252 seconds (JVM running for 3.703)
2017-12-12 18:01:09.472  INFO 4036 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2017-12-12 18:01:09.472  INFO 4036 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2017-12-12 18:01:09.494  INFO 4036 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 22 ms

测试：

http://localhost:8080/hello/%E4%BD%BF%E7%94%A8controller

浏览器显示：Hello 使用controller!!!

================================================================================================================================

6、好了，继续看官方文档

下面官方给出了这样一个代码，其实和上面一样的，但是合在一起就很别扭，没有上面那个人分开写更清晰：

@RestController
@EnableAutoConfiguration
public class Example2 {

    @RequestMapping("/e2")
    String home() {
        return "Hello World!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Example.class, args);
    }

}

7、然后介绍了两个基础注解，以及集成的mvn给项目打包

8、总体看了几眼文档，看饿了，先回家吃饭