SpringBoot2.x webflux响应式编程实战

1、WebFlux中，请求和响应不再是WebMVC中的ServletRequest和ServletResponse，而是ServerRequest和ServerResponse

2、加入依赖，如果同时存在spring-boot-starter-web，则会优先用spring-boot-starter-web
       <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-webflux</artifactId>
       </dependency>

3.Service业务接口

package net.xdclass.webflux_project.service;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.springframework.stereotype.Service;

import net.xdclass.webflux_project.domain.User;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@Service
public class UserService {

   private static final Map<String,User> dataMap = new HashMap<>();

   static {
       dataMap.put("1",new User("1", "冰"));
       dataMap.put("2",new User("2", "雪"));
       dataMap.put("3",new User("3", "之"));
       dataMap.put("4",new User("4", "华"));
   }

   /**
   * 返回列表
   */
   public Flux<User> list(){
       Collection<User> list = this.dataMap.values();
       return Flux.fromIterable(list);
   }

   /**
   * 根据id查找用户
   */
   public Mono<User> getById(final String id){
       return Mono.justOrEmpty(this.dataMap.get(id));
   }

   /**
   * 删除用户
   */
   public Mono<User> del(final String id){
       return Mono.justOrEmpty(this.dataMap.remove(id));
   }
}

Controller类

package net.xdclass.webflux_project.controller;

import java.time.Duration;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import net.xdclass.webflux_project.domain.User;
import net.xdclass.webflux_project.service.UserService;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@RestController
@RequestMapping("/api/v1/user")
public class UserController {

   @Autowired
   private UserService UserService;

   @GetMapping("/test")
   public Mono<String> test(){
       return Mono.just("冰雪之华");
   }

//下面的注解说明是响应式编程，在界面返回的是每2秒返回一个，非阻塞的

//相对于非响应式编程，全部查出再返回效率更高。

//需要注意的是mysql不支持，redis等支持
   @GetMapping(value="list",produces=MediaType.APPLICATION_STREAM_JSON_VALUE)
   public Flux<User> list(){
       return UserService.list().delayElements(Duration.ofSeconds(2));
   }

   @GetMapping("getById")
   public Mono<User> getById(String id){
       return UserService.getById(id);
   }

   @GetMapping("del")
   public Mono<User> del(String id){
       return UserService.del(id);
   }
}

SpringBoot2.x webflux响应式编程实战

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