SpringBoot入门系列：第一篇 Hello World

淩亂°似流年 2022-07-15 05:20 250阅读 0赞

标签： [ springboot][springboot]

2016-06-19 10:36  13886人阅读 [评论][Link 1](4) 收藏 [举报][Link 2]

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目录[(?)][Link 4][\[+\]][Link 4]

1.  [Maven入门指南使用Nexus搭建Maven私服][Maven_Nexus_Maven]
2.  
3.  [使用nexus搭建maven私服手动更新索引][nexus_maven]

跟随SpringBoot的文档（http://docs.[spring][].io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/\#boot-documentation）学习，前后几章关联才调通代码，煞是痛苦，在这里记录结果，过程隐忍。

一、准备工作

1、根据Maven工程特点，建立文档结果

myFirstProject

+-src

+-main

+-[Java][spring]

+-resources

+-test

+-java

+-resources

2、再在src/main/java下依次建立文件夹com，example，myFirstProject，可以构成Maven工程包(package)-->com.example.myFirstProject,最后文档结构如图1

![Center][]

图1

3、编制pom.xml,存于myFirstProject文件夹下，与src同级

**\[html\]** [ view plain][Link 4] [ copy][Link 4] [ print][Link 4] [?][Link 4] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  <?xml version="1.0" encoding="UTF-8"?>  
2.  <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
3.      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  
4.      <modelVersion>4.0.0</modelVersion>  
5.    
6.      <groupId>com.example</groupId>  
7.      <artifactId>myFirstproject</artifactId>  
8.      <version>0.0.1-SNAPSHOT</version>  
9.    
10.       
11.     <parent>  
12.         <groupId>org.springframework.boot</groupId>  
13.         <artifactId>spring-boot-starter-parent</artifactId>  
14.         <version>1.4.0.BUILD-SNAPSHOT</version>  
15.     </parent>  
16.   
17.       
18.     <dependencies>  
19.         <dependency>  
20.             <groupId>org.springframework.boot</groupId>  
21.             <artifactId>spring-boot-starter-web</artifactId>  
22.         </dependency>  
23.     </dependencies>  
24.   
25.       
26.     <build>  
27.         <plugins>  
28.             <plugin>  
29.                 <groupId>org.springframework.boot</groupId>  
30.                 <artifactId>spring-boot-maven-plugin</artifactId>  
31.             </plugin>  
32.         </plugins>  
33.     </build>  
34.   
35.       
36.       
37.     <repositories>  
38.         <repository>  
39.             <id>spring-snapshots</id>  
40.             <url>http://repo.spring.io/snapshot</url>  
41.             <snapshots><enabled>true</enabled></snapshots>  
42.         </repository>  
43.         <repository>  
44.             <id>spring-milestones</id>  
45.             <url>http://repo.spring.io/milestone</url>  
46.         </repository>  
47.     </repositories>  
48.     <pluginRepositories>  
49.         <pluginRepository>  
50.             <id>spring-snapshots</id>  
51.             <url>http://repo.spring.io/snapshot</url>  
52.         </pluginRepository>  
53.         <pluginRepository>  
54.             <id>spring-milestones</id>  
55.             <url>http://repo.spring.io/milestone</url>  
56.         </pluginRepository>  
57.     </pluginRepositories>  
58. </project>

![save_snippets.png][]

<?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>myFirstproject</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    
        
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.4.0.BUILD-SNAPSHOT</version>
        </parent>
    
        
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
        </dependencies>
    
        
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
        
        
        <repositories>
            <repository>
                <id>spring-snapshots</id>
                <url>http://repo.spring.io/snapshot</url>
                <snapshots><enabled>true</enabled></snapshots>
            </repository>
            <repository>
                <id>spring-milestones</id>
                <url>http://repo.spring.io/milestone</url>
            </repository>
        </repositories>
        <pluginRepositories>
            <pluginRepository>
                <id>spring-snapshots</id>
                <url>http://repo.spring.io/snapshot</url>
            </pluginRepository>
            <pluginRepository>
                <id>spring-milestones</id>
                <url>http://repo.spring.io/milestone</url>
            </pluginRepository>
        </pluginRepositories>
    </project>

文档内容从SpringBoot的文档拷贝

4、编制Application.java存于myFirstProject\\src\\main\\java\\com\\example\\myFirstProject下

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1.  package com.example.myFirstProject;  
2.    
3.  import org.springframework.boot.SpringApplication;  
4.  import org.springframework.boot.autoconfigure.SpringBootApplication;  
5.    
6.    
7.  @SpringBootApplication  
8.  public class Application \{  
9.    
10.     public static void main(String\[\] args) \{  
11.         SpringApplication.run(Application.class, args);  
12.     \}  
13. \}

![save_snippets.png][]

package com.example.myFirstProject;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    
    @SpringBootApplication
    public class Application {
    
    	public static void main(String[] args) {
    		SpringApplication.run(Application.class, args);
    	}
    }

5、编制Example.java，存于myFirstProject\\src\\main\\java\\com\\example\\myFirstProject下

**\[java\]** [ view plain][Link 4] [ copy][Link 4] [ print][Link 4] [?][Link 4] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

1.  package com.example.myFirstProject;  
2.    
3.  import org.springframework.boot.autoconfigure.EnableAutoConfiguration;  
4.  import org.springframework.web.bind.annotation.PathVariable;  
5.  import org.springframework.web.bind.annotation.RequestMapping;  
6.  import org.springframework.web.bind.annotation.RestController;  
7.    
8.  @RestController  
9.  @EnableAutoConfiguration  
10. public class Example \{  
11.       
12.     @RequestMapping("/")  
13.     String home() \{  
14.         return "Hello World!";  
15.     \}  
16.       
17.     @RequestMapping("/hello/\{myName\}")  
18.     String index(@PathVariable String myName) \{  
19.         return "Hello "\+myName+"!!!";  
20.     \}  
21. \}

![save_snippets.png][]

package com.example.myFirstProject;
    
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @EnableAutoConfiguration
    public class Example {
    	
    	@RequestMapping("/")
        String home() {
            return "Hello World!";
        }
    	
    	@RequestMapping("/hello/{myName}")
        String index(@PathVariable String myName) {
            return "Hello "+myName+"!!!";
        }
    }

二、Maven工程导入

1、启动eclipse

1.1、java-->jdk1.7.0\_80x64

1.2、maven-->Apache Maven 3.3.3

1.3、Eclipse [ Java EE][spring] IDE for Web Developers. Version: Mars Release (4.5.0)

1.4、为本练习，新建一个workgroup

2、在eclipse中，依次点击file-->import-->Maven-->Existing Maven Projects-->Next-->Browse-->定位到myFirstProject文件夹-->确定--Finish

3、导入结果如图2

![Center 1][]

图2

三、运行

1、在eclipse的工程myFirstProject上右击鼠标，选择Run as-->[Java ][Java]Application，如图3

![Center 2][]

2、在select Java Aplication中选择“Application -com.example.myFirstProject”，如图4

![Center 3][]

图4

3、再次点击“OK”按钮,在Eclipse的Console中开始打印如图5

![Center 4][]

图5

4、打开浏览器，输入http://localhost:8080，显示如图6

![Center 5][]

5、在浏览器中,输入http://localhost:8080/hello/SpringBoot

![Center 6][]

四、后记

痛则不通，通则不痛。这个例子非常之简单，为了这个简单，费事不少。为了这个例子能够成功，最好做以下准备

1、构建本地的Maven伺服，否则速度痛苦

2、Sonatype Nexus尽量和jdk相对应的版本，不要最求最新，否则可能启动不起来。

3、Sonatype Nexus搭建，参考

# [Maven入门指南⑤：使用Nexus搭建Maven私服][Maven_Nexus_Maven 1] #

#     #

# [使用nexus搭建maven私服、手动更新索引][nexus_maven 1] #

顶

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*  上一篇[Git的相关用法][Git]
 *  下一篇[SpringBoot入门系列：第二篇 再学Hello World][SpringBoot_ _Hello World]

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