spring入門hello world

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1.maven工程建立

 

<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.ithuan</groupId>  <artifactId>spring-boot-hello1</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>spring-boot-hello</name>  <url>http://maven.apache.org</url><!-- spring boot 父節點依賴,引入這個之後相關的引入就不需要添加version配置，spring boot會自動選擇最合適的版本進行添加。 --><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.1.RELEASE</version></parent>    <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <!-- 指定一下jdk的版本 ，這裡我們使用jdk 1.8 ,預設是1.6 -->    <java.version>1.8</java.version>  </properties>  <dependencies>    <!--   spring-boot-starter-web: MVC,AOP的依賴包....   -->  <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><!-- <version></version>由於我們在上面指定了 parent(spring boot) --></dependency><!-- 添加fastjson 依賴包. --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.15</version></dependency><!-- spring boot devtools 依賴包. --><dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <optional>true</optional>           <scope>true</scope></dependency>  </dependencies><!-- 構建節點. --><build><plugins><!-- 在這裡添加springloader plugin<plugin>          <groupId>org.springframework.boot</groupId>          <artifactId>spring-boot-maven-plugin </artifactId>          <dependencies>             <dependency>                 <groupId>org.springframework</groupId>                 <artifactId>springloaded</artifactId>                 <version>1.2.4.RELEASE</version>           </dependency>          </dependencies>          <executions>             <execution>                 <goals>                     <goal>repackage</goal>                 </goals>                 <configuration>                     <classifier>exec</classifier>                 </configuration>             </execution>         </executions></plugin> --><!-- 這是spring boot devtool plugin --><plugin>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-maven-plugin</artifactId>            <configuration>          <!--fork :  如果沒有該項配置，肯呢個devtools不會起作用，即應用不會restart -->                <fork>true</fork>            </configuration>        </plugin></plugins></build>  </project>

　　

2.controller層編寫

package com.ithuan;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class Demo {@RequestMapping("/hello")public String test01(){return "hello world";}}

　　

3.啟動類編寫

package com.ithuan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * Hello world! * */@SpringBootApplicationpublic class App {    public static void main( String[] args )    {    SpringApplication.run(App.class, args);            System.out.println( "Hello World!" );    }}

　　

spring入門hello world