spring boot之Hello

第一步：创建maven工程，此过程不再赘述

第二部：在pom中添加依赖

<?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.huawei</groupId>
  <artifactId>spring-boot-hello</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>spring-boot-hello</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.6.RELEASE</version>
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency><!--MVC,AOP的依赖包-->
      <!--在parent中已经设置了version，这里就不需要设置，spring会自动设置合适的version-->
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

第三步：创建HelloController类

package com.huawei;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * RestController等价于@Controller和@RequestBody
 */
@RestController
public class HelloController
{
    /**
     * 这里我们使用RequestMapping 建立请求映射
     * @return
     */
    @RequestMapping("/hello")
    public String hello() {
        return "hello";
    }

    /**
     * springBoot默认使用的json解析框架是jackson
     * @return
     */
    @RequestMapping("demo")
    public Demo getDemo() {
        Demo demo = new Demo();
        demo.setId(1);
        demo.setName("张三");
        return demo;
    }
}

第四步：配置入口类：

package com.huawei;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import java.util.ArrayList;
import java.util.List;
/**
 * 使用SpringBootApplication指定一个spring boot的启动类
 * Hello world!
 *
 */
@SpringBootApplication
public class App extends WebMvcConfigurationSupport
{
    /**
     * 在main方法中启动我们的应用程序
     * @param args
     */
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
}

 

第五步：运行

在浏览器输入：http://127.0.0.1:8080/hello