SpringBoot webflux响应式编程（整理二 实例）

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

		
				org.springframework.boot
				spring-boot-starter-webflux
		

3、案例

User.java

public class User {
	private String id;
	private String name;
	public User(String id, String name) {
		super();
		this.id = id;
		this.name = name;
	}
}

UserService .java

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@Service
public class UserService {
	private static final Map dataMap = new HashMap<>();

	static {
		dataMap.put("1",new User("1","用户1"));
		dataMap.put("2",new User("2","用户2"));
		dataMap.put("3",new User("3","用户3"));
		dataMap.put("4",new User("4","用户4"));
		dataMap.put("5",new User("5","用户5"));
		dataMap.put("6",new User("6","用户6"));
		dataMap.put("7",new User("7","用户7"));
	}

	/**
	 * 返回用户列表
	 * @return
	 */
	public Flux list(){
		Collection list = UserService.dataMap.values();
		return Flux.fromIterable(list);
	}

	/**
	 * 根据id查找用户
	 * @param id
	 * @return
	 */
	public Mono getById(final String id){
		return Mono.justOrEmpty(UserService.dataMap.get(id));
	}

	/**
	 * 根据id删除指定用户
	 * @param id
	 * @return
	 */
	public Mono delById(final String id){
		return Mono.justOrEmpty(UserService.dataMap.remove(id));
	}
}

import org.springframework.http.MediaType;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.time.Duration;

@RestController
@RequestMapping("/web_flux/user")
public class WebFluxUserController {

	//@Autowired
	//private UserService userService;

	private final UserService userService;

	public WebFluxUserController(final UserService userService){
		this.userService=userService;
	}

	@GetMapping("/test")
	public Mono test(){
		return Mono.just("hello web_flux");
	}

	@GetMapping("list")
	public Flux list(){
		return userService.list();
	}

	@GetMapping("find")
	public Mono findUserById(final String id){
		return userService.getById(id);
	}

	@GetMapping("del")
	public Mono delUserById(final String id){
		return userService.delById(id);
	}

	@GetMapping("list_duration")
	public Flux list_duration(){
		//list.size()*2s 后返回结果
		return userService.list().delayElements(Duration.ofSeconds(2));
	}

	@GetMapping(value = "list_duration_produces",produces = MediaType.APPLICATION_STREAM_JSON_VALUE)
	public Flux list_duration_produces(){
		//每 2s 后返回结果
		return userService.list().delayElements(Duration.ofSeconds(2));
	}
}

4、测试

http://localhost:8080/web_flux/user/test

http://localhost:8080/web_flux/user/list

http://localhost:8080/web_flux/user/find?id=1

http://localhost:8080/web_flux/user/list_duration_produces

http://localhost:8080/web_flux/user/del?id=1

http://localhost:8080/web_flux/user/list_duration

5、SpringBoot WebFlux客户端WebClient的介绍和使用

import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.client.WebClient;

import reactor.core.publisher.Mono;

//@RunWith(SpringRunner.class)  //底层用junit  SpringJUnit4ClassRunner
//@SpringBootTest(classes={FbiaoApplication.class})//启动整个springboot工程
public class WebClientTest {

	  @Test
	  public void testBase(){
	    Mono resp = WebClient.create()
	        .get()
	        //多个参数也可以直接放到map中,参数名与placeholder对应上即可
	        .uri("http://localhost:8080/web_flux/user/find?id=1") //使用占位符
	        .accept(MediaType.APPLICATION_JSON)
	        .retrieve()
	        .bodyToMono(String.class);
	    System.out.println(resp.block());
	  }
}

import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.client.WebClient;

import reactor.core.publisher.Mono;

//@RunWith(SpringRunner.class)  //底层用junit  SpringJUnit4ClassRunner
//@SpringBootTest(classes={FbiaoApplication.class})//启动整个springboot工程
public class WebClientTest {
	  @Test
	  public void testPlaceHolder(){
	    Mono resp = WebClient.create()
	        .get()
	        .uri("http://localhost:8080/web_flux/user/find?id={id}",2) //使用占位符
	        .accept(MediaType.APPLICATION_JSON)
	        .retrieve()
	        .bodyToMono(String.class);
	    System.out.println(resp.block());
	  }
}