SpringBoot入门程序HelloWorld

1.创建一个maven项目spring-boot-hello

2.编写pom.xml

<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.pypua</groupId>
  <artifactId>spring-boot-hello</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>spring-boot-hello</name>
  <url>http://maven.apache.org</url>
<!-- spring boot 父节点依赖 ，引入这个之后相关的引入就不需要添加version配置，spring boot会自动选择最合适的版本添加-->
<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 ，这里我们使用jdk 1.8 ,默认是1.6 -->
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
 <!-- spring-boot-starter-web: MVC,AOP的依赖包....-->
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <!-- 
            <version></version>
            由于我们在上面指定了 parent(spring boot)
         -->
    </dependency>
    
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.6.1</version>
</dependency>
 
 <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>1.6.1</version>
</dependency>

<!-- 添加fastjson 依赖包. -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.15</version>
        </dependency>
    
  </dependencies>
</project>

3.编写Controller类

package com.pypua;

import java.util.Date;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
/**
 * 这里使用@RestController相当于@Controller和@RequestBody 
 * @author pypua
 *
 */
public class helloController {

    @RequestMapping("/hello")
    public String hello(){
        return "hello";
    }
    /**
     * spring boot默认使用的json框架是jackson
     * @return
     */
    @RequestMapping("/getDemo")
    public demo getDemo(){
        demo demo = new demo();
        demo.setId(1);
        demo.setName("张三");
        demo.setCreateTime(new Date());
        demo.setRemarks("这个是测试");
        return demo;
    }
}

4.编写App.java

package com.pypua;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import javax.security.auth.message.callback.PrivateKeyCallback.Request;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;

/**
 * Hello world!
 *在这里我们使用@SpringBootApplication指定这是一个spring boot应用程序
 */
@SpringBootApplication
public class App
{
    public static void main( String[] args )
    {
        //在main方法中启动应用程序
        SpringApplication.run(App.class,args);
    }
}