Spring Boot入门篇

Spring Boot是Spring家族当下最流行的框架之一，其基本上整合了JAVA市面上的主流框架。如 ：xxxxx-starter-xxxxx

个人拙见，springboot最突出的应该就是高效自动化还有其独特的yml格式配置文件。话不多了，开始搞事。注：此处使用的是Springboot2，最新版本，与之前版本有所buto（个人拙见，学习回顾，望各位大佬多多指正）

POM.xml配置文件

​
<?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>
   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.1.1.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>cn.cupid</groupId>
   <artifactId>demo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>demo</name>
   <description>Demo project for Spring Boot</description>

   <properties>
      <java.version>1.8</java.version>
   </properties>

   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-devtools</artifactId>
         <optional>true</optional>
      </dependency>

      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
      </dependency>

      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>

   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>

</project>

​

配置文件resources根目录下application.properties/application.yml

在最初demo暂时无需配置，后续使用，会对其进行逐步添加。

程序入口（SpringBoot项目入口）

@SpringBootApplication
public class DemoApplication {

	public static void main(String[] args) {
        //方式一
		SpringApplication application = new SpringApplication(DemoApplication.class);
		application.addListeners(new DemoListener());
		application.run(args);
        //方式二
        SpringApplication.run(DemoApplication.class, args);
	}

}

新建一个实体类用于测试

package cn.cupid.domain;

import org.springframework.boot.autoconfigure.domain.EntityScan;

import java.io.Serializable;

/**
 * @Author: cupid
 * Created by Cupid520 on 2018/12/27.
 * @Description:
 */
@EntityScan
public class User implements Serializable{

    private static final long serial = 1l;

    private Long UID;
    private String UNAME;
    private String UPWD;

    public User(){
        super();
    }

    public User(Long UID, String UNAME, String UPWD) {
        this.UID = UID;
        this.UNAME = UNAME;
        this.UPWD = UPWD;
    }

    public Long getUID() {
        return UID;
    }

    public void setUID(Long UID) {
        this.UID = UID;
    }

    public String getUNAME() {
        return UNAME;
    }

    public void setUNAME(String UNAME) {
        this.UNAME = UNAME;
    }

    public String getUPWD() {
        return UPWD;
    }

    public void setUPWD(String UPWD) {
        this.UPWD = UPWD;
    }

    @Override
    public String toString() {
        return "User{" +
                "UID=" + UID +
                ", UNAME='" + UNAME + '\'' +
                ", UPWD='" + UPWD + '\'' +
                '}';
    }
}

新建一个Controller控制器，用于接收客户端请求

package cn.cupid.controller;

import cn.cupid.domain.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author: cupid
 * Created by Cupid520 on 2018/12/27.
 * @Description: simple controller
 */
@RestController
public class HelloController {
        
        @RequestMapping("/getUser")
        public User getUser(){
            User user = new User();
            user.setUID(123L);
            user.setUNAME("test");
            user.setUPWD("12235");
            return user;
        }
}

对于Controller中的注解@RestControllers实际上相当于Spring MVC中注解@ResponserBody与@Controller相结合

点击运行上述的DemoApplication类中的main方法，运行结果如下：

‘’   可以看到明显的spring的logo，至于其中的红色字体是个人的其他类作用，与此次运行无关，忽略即可。

从浏览器访问，效果如下：

 

自此，第一个demo完成了