SpringBoot入门系列：第一篇 Hello World

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一、准备工作

1、根据Maven工程特点，建立文档结果

myFirstProject

+-src

+-main

+-java

+-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

图1

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

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<?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>
<!– Inherit defaults from Spring Boot –>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.BUILD-SNAPSHOT</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>
<!– Add Spring repositories –>
<!– (you don’t need this if you are using a .RELEASE version) –>
<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>

<?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>    <!-- Inherit defaults from Spring Boot -->    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.4.0.BUILD-SNAPSHOT</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>    <!-- Add Spring repositories -->    <!-- (you don't need this if you are using a .RELEASE version) -->    <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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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);
}
}

package com.example.myFirstProject;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic 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

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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+“!!!”;
}
}

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@EnableAutoConfigurationpublic 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 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