Springboot：配置jdk、maven、idea，使用向导快速创建SpringBoot项目

spring微服务解析

第一个springboot程序

环境约束
①jdk1.8：Spring Boot 推荐jdk1.7及以上；java version “1.8.0_112”
②maven3.x：maven 3.3以上版本；Apache Maven 3.3.9

Maven-settings.xml配置

>
  >jdk-1.8>
  >
    >true>
    >1.8>
  >
  >
    >1.8>
    >1.8>
    >1.8>
  >
>

③IntelliJIDEA2017：IntelliJ IDEA 2017.2.2 x64、STS（后期需要升级更高级别，负责不支持springboot）
④SpringBoot 1.5.9.RELEASE：1.5.9；

1.修改maven配置

C:\DevTools\maven\apache-maven-3.2.2\apache-maven-3.2.2\conf


修改settings.xml

修改java环境变量

2.Java及maven配置

C:\Users\asus>java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

C:\Users\asus>mvn -version
Apache Maven 3.2.2 (45f7c06d68e745d05611f7fd14efb6594181933e; 2014-06-17T21:51:42+08:00)
Maven home: C:\DevTools\maven\apache-maven-3.2.2\apache-maven-3.2.2\bin\..
Java version: 1.8.0_45, vendor: Oracle Corporation
Java home: C:\JAVA\JDK\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 8.1", version: "6.3", arch: "amd64", family: "dos"

3.Idea配置

4.导入springboot相关依赖

"1.0" encoding="UTF-8"?>
"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">
    4.0.0</modelVersion>

    com.cevent</groupId>
    spring-boot-01-hellocevent</artifactId>
    1.0-SNAPSHOT</version>

    <!--格式化代码：ctrl+shift+F / ctrl+alt+L-->
    
        org.springframework.boot</groupId>
        spring-boot-starter-parent</artifactId>
        1.5.9.RELEASE</version>
    </parent>
    
        
            org.springframework.boot</groupId>
            spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

</project>

5.helloword需求：浏览器发送hello请求，服务器接受请求并处理，响应Hello Cevent World字符串；

创建一个maven工程；（jar）
编写主程序：启动spring boot应用

编写主程序：启动spring boot应用
package com.cevent.springboot;/**
 * Created by Cevent on 2020/7/5.
 */

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/** 第一个SpringBoot Application
 * @author cevent
 * @description
 * @date 2020/7/5 21:12
 * @SpringBootApplication 声明本类为spring boot 应用主配置类
 */
@SpringBootApplication
public class HelloCeventMainAPP {
    public static void main(String[] args) {
        //1.启动Spring应用，,传入的类一定是@SpringBootApplication标注的类
        SpringApplication.run(HelloCeventMainAPP.class,args);
    }
}

6.编写相关的Controller、Service

package com.cevent.springboot.controller;/**
 * Created by Cevent on 2020/7/5.
 */

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author cevent
 * @description
 * @date 2020/7/5 21:17
 * @Controller 声明本类为controller类
 */
@Controller
public class HelloCeventMainAPPController {
    //@RequestMapping绑定来自浏览器的hello请求
    //@ResponseBody，将string方法的内容返回写入到浏览器
    @ResponseBody
    @RequestMapping("/hello")
    public String helloCevent(){
        return "Hello Cevent!";
    }
}

7.测试main APP启动

访问链接：http://localhost:8080/
没有配置tomcat，默认报错可忽略

访问：http://localhost:8080/hello

8.简化部署（将工程APP打包，创建可执行的jar包）配置pom

<?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.cevent</groupId>
    <artifactId>spring-boot-01-hellocevent</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--格式化代码：ctrl+shift+F / ctrl+alt+L
    父项目，导入依赖的后端jar
    -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>
    <dependencies>
        <!--spring-boot-starter场景启动器，导入web模块正常运行所需要的组件，前端kjar-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <!--boot-maven插件：将应用打包为jar包-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

复制路径：D:\DEV_CODE\Intelligy_idead_code\spring\springboot\springboot01hellocevent\target
说明：windows10下，直接找到jar包文件夹所在目录，清空目录，回车进行当前目录cmd

D:\DEV_CODE\Intelligy_idead_code\spring\springboot\springboot01hellocevent\target>java -jar spring-boot-01-hellocevent-1.0-SNAPSHOT.jar

访问：http://localhost:8080/hello

9.使用向导快速创建SpringBoot

9.11-1使用Spring Initializer向导快速创建SpringBoot

IDE支持Spring的项目创建向导快速实现SpringBoot项目




自动向导完成创建springboot项目

9.2pom配置

"1.0" encoding="UTF-8"?>
"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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
   4.0.0</modelVersion>
   
      org.springframework.boot</groupId>
      spring-boot-starter-parent</artifactId>
      2.3.1.RELEASE</version>
      /> <!-- lookup parent from repository -->
   </parent>
   com.cevent</groupId>
   spring-boot-01-hellocevent-quick</artifactId>
   0.0.1-SNAPSHOT</version>
   spring-boot-01-hellocevent-quick</name>
   Demo project for Spring Boot</description>

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

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

      
         org.springframework.boot</groupId>
         spring-boot-starter-test</artifactId>
         test</scope>
         
            
               org.junit.vintage</groupId>
               junit-vintage-engine</artifactId>
            </exclusion>
         </exclusions>
      </dependency>
   </dependencies>

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

</project>

9.3自动生成的mainClassAPP

自动生成的mainClassAPP
package com.cevent.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBoot01HelloceventQuickApplication {

   public static void main(String[] args) {
      SpringApplication.run(SpringBoot01HelloceventQuickApplication.class, args);
   }

}

9.4自定义Controller

自定义Controller
package com.cevent.springboot.controller;/**
 * Created by Cevent on 2020/7/5.
 */

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author cevent
 * @description
 * @date 2020/7/5 23:11
 * @ResponseBody 加在类头，表示本类所有方法返回的数据都转接给浏览器（如果是对象，还可以转为json对象）
 *
 * 类头可以将@ResponseBody 和 @Controller 省略结合，变为@RestController，是spring4.2新加入的功能
 */
/*@ResponseBody
@Controller*/
@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello(){
        return "hello cevent to create quick springboot!";
    }
}

9.5实现

9.6修改默认配置，如tomcat端口号