Spring Boot学习笔记(四) -编写HelloWorld

创建项目

• 创建一个空项目
  
• 创建模块
  ))))

  编写POM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>
      <groupId>com.xiezhenyu</groupId>
      <artifactId>springboothellowrold2</artifactId>
      <version>1.0-SNAPSHOT</version>
      <!-- 继承 -->
      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>2.2.6.RELEASE</version>
      </parent>
      <!-- 依赖 -->
      <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
      </dependencies>
      <!-- 插件 -->
      <build>
          <plugins>
              <plugin>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-maven-plugin</artifactId>
              </plugin>
          </plugins>
      </build>
  </project>

修改Tomacat端口

server:
  port: 8888

创建启动类

package com.xiezhenyu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * 启动类
 */
@SpringBootApplication
public class SpringBootHelloWorld2Application {
    public static void main(String[] args){
        SpringApplication.run(SpringBootHelloWorld2Application.class,args);
    }
}

创建Controller

package com.xiezhenyu.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * 处理请求Controller
 */
@RestController  //@Controller+@ResponsBody的复合体,加了这个之后，下面的所有操作都不进行页面跳转，直接返回json串（字符串）等。
public class HelloWorldController {
    @RequestMapping("/HelloWorld")
    public String ShowHelloWorld(){
        return "HelloWorld";
    }
}

运行结果