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003-Spring-Guide

003-Spring-Guide

作者: Time_情书 | 来源:发表于2021-06-01 23:48 被阅读0次

    一:步骤

    1-:在https://start.spring.io/新建项目,其中,Dependencies选择“Spring Web”;

    image.png

    二:相关命令

    ./mvnw spring-boot:run     启动项目
    

    三:简单的Spring例子:

    package com.time.message;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    @SpringBootApplication
    @RestController
    public class MessageApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(MessageApplication.class, args);
        }
    
        @GetMapping("/hello")
        public String hello(@RequestParam(value = "name",defaultValue = "World") String name){
            return  String.format("Hello %s!",name);
        }
    }
    
    

    四:RESTful Web Service

    package com.time.message.restservice;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.concurrent.atomic.AtomicLong;
    
    @RestController
    public class GreetingController {
        private static final String template = "Hello %s!";
        private final AtomicLong counter = new AtomicLong();
    
        @GetMapping("/greeting")
        public Greeting greeting(@RequestParam(value = "name",defaultValue = "World") String name){
            return  new Greeting(counter.incrementAndGet(),String.format(template,name));
        }
    }
    
    

    其中需要关注:

      @GetMapping("/greeting")                GET请求方式
      @PostMapping("/greeting")             POST请求方式
      @RequestMapping("/greeting")        GET/POST
      @RequestMapping(method=GET)    设置为GET
    
     即为: @RequestMapping(value = "/greeting",method = RequestMethod.GET)
    
    

    五:Scheduling Tasks

    package com.time.message.restservice;
    
    import org.springframework.stereotype.Component;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.scheduling.annotation.Scheduled;
    import org.springframework.stereotype.Component;
    
    @Component
    public class ScheduledTasks {
        private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);
    
        private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
    
        @Scheduled(fixedRate = 5000)
        public void reportCurrentTime() {
            log.info("The time is now {}", dateFormat.format(new Date()));
        }
    }
    
    

    同时,需要在Application中,添加注解-“EnableScheduling”:

    package com.time.message;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.EnableScheduling;
    
    @SpringBootApplication
    @EnableScheduling
    public class MessageApplication {
        public static void main(String[] args) {
            SpringApplication.run(MessageApplication.class, args);
        }
    }
    
    

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