SpringBoot(一)：使用eclipse/idea创建springboot helloword工程

eclipse如何创建spring boot工程：

第一步：首先打开eclipse，找到图中的下图的中“下三角”符号，选中"working sets"(表示将会把eclipse中的工程以working sets方式呈现，而不是单个project列表呈现)

第二步：依然是找出上图的菜单，点击“Select Working Set...”，弹出框：

点击“New...”可以新建新的working set，也可以配置当前工作区域显示哪些，不显示哪些working set。

第三步：通过上边的配置，我们新增一个springboot的working set，选中springboot该working set，然后新建maven工程：

SpringBoot工程创建操作步骤描述：

1）先选中springboot该working set；

2）在eclipse的导航栏中选中file->new->maven project；

3）在“New Maven Project”窗口中，勾选“Create a simple project(skip archetype selection)”

4）新建好的maven工程如下：

备注：

如果此时maven的pom.xml第一行出现错误：org.apache.maven.archiver.MavenArchiver.getManifest(org.apache.maven.project.MavenProject, org.apache.maven.archiver.MavenArchiveConfiguration)

解决方案：

a、Help——>Install New SoftWare

b、http://repo1.maven.org/maven2/.m2e/connectors/m2eclipse-mavenarchiver/0.17.2/N/LATEST/
c、按照安装提示，一直next，重启eclipse之后，执行maven-update project。

5）在pom.xml中添加spring boot 2.0.1的依赖信息：

 <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.dx</groupId>
     <artifactId>springboot-helloword</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <!-- springboot父类依赖 -->
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.0.1.RELEASE</version>
     </parent>

     <dependencies>
         <!-- springboot web组件依赖 -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
     </dependencies>
 </project>

6）在src下新建com.dx.controller包，在包下创建HelloWordController.java

package com.dx.controller;

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;

@EnableAutoConfiguration
@Controller
public class HelloWordController {
    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String index() {
        System.out.println("index is running...");
        return "welcome";
    }
}

7）在com.dx.controller包下，创建MyApplication.java

import com.dx.controller.HelloWordController;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

此时，工程文件结构如下：

8）运行测试，在MyApplication.java编辑窗口中右键，run as -> Spring Boot App

运行后，访问：http://localhost:8080/index

运行窗口打印信息如下：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.1.RELEASE)

2018-04-06 16:30:48.698  INFO 9376 --- [           main] com.dx.controller.MyApplication          : Starting MyApplication on WIN-MHALQACGIOO with PID 9376 (D:\workspace5\springboot-helloword\target\classes started by Administrator in D:\workspace5\springboot-helloword)
2018-04-06 16:30:48.707  INFO 9376 --- [           main] com.dx.controller.MyApplication          : No active profile set, falling back to default profiles: default
2018-04-06 16:30:48.813  INFO 9376 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@71c8becc: startup date [Fri Apr 06 16:30:48 CST 2018]; root of context hierarchy
2018-04-06 16:30:50.973  INFO 9376 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2018-04-06 16:30:51.013  INFO 9376 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2018-04-06 16:30:51.014  INFO 9376 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.29
2018-04-06 16:30:51.032  INFO 9376 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [D:\Program Files\Java\jdk1.8.0_111\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:/Program Files/Java/jdk1.8.0_111/bin/../jre/bin/server;D:/Program Files/Java/jdk1.8.0_111/bin/../jre/bin;D:/Program Files/Java/jdk1.8.0_111/bin/../jre/lib/amd64;C:\Python27;C:\Python27\Scripts;D:\Work\Java_Dev\mysql-5.7.17-winx64\bin;D:\Program Files\Java\jdk1.8.0_111\bin;D:\Program Files\Java\jdk1.8.0_111\jre\bin;C:\Program Files (x86)\scala\bin;%SBT_HOME%\bin;D:\演示\SuperMap\SMO_DotNET_810_14127_58257_Bin_x64\Bin_x64;%;ystemRoot%\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\VisualSVN Server\bin;C:\Program Files\TortoiseSVN\bin;C:\Program Files (x86)\IDM Computer Solutions\UltraEdit;D:\Work\Java\apache-maven-3.5.0-bin\apache-maven-3.5.0\bin;D:\RN_software\Git\cmd;D:\RN_software\nodejs\;D:\Program Files\android-sdk\platform-tools;D:\Program Files\android-sdk\tools;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files (x86)\Microsoft SQL Server\100\DTS\Binn\;D:\ffmpeg-20170915-6743351-win64-static\bin;E:\Go\bin;C:\Program Files\Microsoft\Web Platform Installer\;D:\Program Files (x86)\Microsoft VS Code\bin;C:\Users\Administrator\AppData\Roaming\npm;C:\Users\Administrator\AppData\Local\GitHubDesktop\bin;D:\Program Files\eclipse-jee-mars-R-win32-x86_64\eclipse;;.]
2018-04-06 16:30:51.182  INFO 9376 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-04-06 16:30:51.182  INFO 9376 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2375 ms
2018-04-06 16:30:51.343  INFO 9376 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2018-04-06 16:30:51.348  INFO 9376 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-04-06 16:30:51.348  INFO 9376 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-04-06 16:30:51.349  INFO 9376 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-04-06 16:30:51.349  INFO 9376 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-04-06 16:30:51.464  INFO 9376 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-06 16:30:51.761  INFO 9376 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@71c8becc: startup date [Fri Apr 06 16:30:48 CST 2018]; root of context hierarchy
2018-04-06 16:30:51.846  INFO 9376 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/index],methods=[GET]}" onto public java.lang.String com.dx.controller.HelloWordController.index()
2018-04-06 16:30:51.851  INFO 9376 --- [           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.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-04-06 16:30:51.852  INFO 9376 --- [           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.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-04-06 16:30:51.878  INFO 9376 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-06 16:30:51.879  INFO 9376 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-04-06 16:30:52.073  INFO 9376 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-04-06 16:30:52.115  INFO 9376 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2018-04-06 16:30:52.120  INFO 9376 --- [           main] com.dx.controller.MyApplication          : Started MyApplication in 4.223 seconds (JVM running for 7.319)
2018-04-06 16:31:02.889  INFO 9376 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-04-06 16:31:02.890  INFO 9376 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2018-04-06 16:31:02.907  INFO 9376 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 17 ms
runing...

idea创建springboot工程：

1）新建一个空的工程：

2）新建空工程完成后，打开“Project Structure...”面板，新建maven工程

新建一个Module，把该Module作为一个maven工程来创建：

选中maven工程，来创建一个maven工程：

一步一步完成，把工程名字定义为springboot_helloword：

3）修改maven工程的pom.xml配置为如下：

<?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.dx</groupId>
    <artifactId>springboot-helloword</artifactId>
    <version>1.0-SNAPSHOT</version>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

 4）新建完成的maven工程添加类，资源文件

a）新建com.dx.controller.HelloWordController.java、MyApplication.java

 package com.dx.controller;

 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;

 @EnableAutoConfiguration
 @Controller
 public class HelloWordController {
     @RequestMapping(value = "/index", method = RequestMethod.GET)
     public String index() {
         System.out.println("index is running...");
         return "welcome";
     }
 }

 import com.dx.controller.HelloWordController;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

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

b）在资源文件夹下添加配置文件application.properties

#修改tomcat的默认的端口号，将8080改为8888
server.port=8888  

c）添加css配置test.css：

body {
    padding: 0px;
    margin: auto;
    font-family: "黑体", "仿宋", Arial, "Arial Unicode MS", System;
    background-color: #00F;
    font-size: 20px;
    text-align: left;
}

d）添加html静态模版文件welcome.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<link href="css/test.css" rel="stylesheet"/>
<body>
<p>welcome page is login.........</p>
</body>
</html>

5）运行测试：

浏览器中输入：http://127.0.0.1:8888/index