1. pom.xml引入以下内容，主要是支持在响应式的环境下对关系型数据库进行访问
org.springframework.boot
spring-boot-starter-data-r2dbc
com.github.jasync-sql
jasync-r2dbc-mysql
1.1.3
注意: 这里对于SpringBoot的版本似乎是有一些要求的，为了避免遇到无法正常启动的情况，建议使用版本2.3.0-RELEASE版本
这里附上完整的xml
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.3.0.RELEASE
cn.lazyfennec
webflux-demo
0.0.1-SNAPSHOT
webflux-demo
Demo project for Spring Boot
1.8
UTF-8
UTF-8
2.3.0.RELEASE
org.springframework.boot
spring-boot-starter-webflux
org.projectlombok
lombok
true
org.springframework.boot
spring-boot-starter-test
test
io.projectreactor
reactor-test
test
org.springframework.boot
spring-boot-starter-data-r2dbc
com.github.jasync-sql
jasync-r2dbc-mysql
1.1.3
org.springframework.boot
spring-boot-dependencies
${spring-boot.version}
pom
import
org.springframework.boot
spring-boot-maven-plugin
org.projectlombok
lombok
2. 修改application.yml
spring:
r2dbc:
url: r2dbcs:mysql://localhost:3306/test
username: root
password: 123456
3. 创建实体类User
package cn.lazyfennec.webfluxdemo.model;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.data.annotation.Id;
import org.springframework.data.relational.core.mapping.Table;
/**
* @Author: Neco
* @Description:
* @Date: create in 2022/7/25 23:15
*/
@Table("t_user")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
@Id
private Long id;
private String name;
}
4. 修改UserController
package cn.lazyfennec.webfluxdemo.controller;
import cn.lazyfennec.webfluxdemo.dao.UserDao;
import cn.lazyfennec.webfluxdemo.model.User;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.stream.IntStream;
/**
* @Author: Neco
* @Description:
* @Date: create in 2022/7/25 22:13
*/
@RestController
@Slf4j
@AllArgsConstructor
public class UserController {
private final UserDao userDao;
@GetMapping("user")
public Flux findAll(){
return userDao.findAll();
}
@PostMapping("save")
public Mono save(@RequestBody User user){
return userDao.save(user);
}
@DeleteMapping("user/{id}")
public Mono delete(@PathVariable Long id){
return userDao.deleteById(id);
}
@GetMapping("user/{id}")
public Mono findById(@PathVariable Long id){
return userDao.findById(id);
}
}
5. 启动类上方增加 @EnableR2dbcRepositories
package cn.lazyfennec.webfluxdemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.r2dbc.repository.config.EnableR2dbcRepositories;
@SpringBootApplication
@EnableR2dbcRepositories // 必须新增这个
public class WebfluxDemoApplication {
public static void main(String[] args) {
SpringApplication.run(WebfluxDemoApplication.class, args);
}
}
6. 启动然后访问相关网址测试
其实除了以上的方式之外，还有另外的方式，即handler 和 router （路由的）方式
新增以下两个类
- UserHandler
package cn.lazyfennec.webfluxdemo.handler;
import cn.lazyfennec.webfluxdemo.dao.UserDao;
import cn.lazyfennec.webfluxdemo.model.User;
import lombok.AllArgsConstructor;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* @Author: Neco
* @Description:
* @Date: create in 2022/7/26 0:25
*/
@Component
@AllArgsConstructor
public class UserHandler {
private final UserDao userDao;
//http://localhost:8080/save
public Mono saveUser(ServerRequest request) {
Mono mono = request.bodyToMono(User.class);
User user = mono.block();
return ServerResponse.ok().build(userDao.save(user).then());
}
public Mono deleteUser(ServerRequest request) {
Long id = Long.valueOf(request.pathVariable("id"));
return ServerResponse.ok().build(userDao.deleteById(id).then());
}
public Mono getUserbyId(ServerRequest request) {
Long id = Long.valueOf(request.pathVariable("id"));
Mono mono = userDao.findById(id);
return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(mono, User.class);
}
public Mono listUser(ServerRequest serverRequest) {
Flux userFlux = userDao.findAll();
return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(userFlux, User.class);
}
}
- UserRouter
package cn.lazyfennec.webfluxdemo.config;
import cn.lazyfennec.webfluxdemo.handler.UserHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.server.RequestPredicates;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;
/**
* @Author: Neco
* @Description:
* @Date: create in 2022/7/26 0:27
*/
@Configuration
public class UserRouter {
@Bean
public RouterFunction routUser(UserHandler userHandler) {
return RouterFunctions
.route(RequestPredicates.GET("/user")
.and(RequestPredicates.accept(MediaType.APPLICATION_JSON)), userHandler::listUser)
.andRoute(RequestPredicates.GET("/user/{id}")
.and(RequestPredicates.accept(MediaType.APPLICATION_JSON)), userHandler::getUserbyId)
.andRoute(RequestPredicates.DELETE("/user/{id}")
.and(RequestPredicates.accept(MediaType.APPLICATION_JSON)), userHandler::deleteUser);
}
}
- 注释掉UserController
访问同样的内容
正常
Tips
官方并不建议使用mysql和webflux相结合，主要是事务方面会产生一定的问题。
关于webflux，在国内其实会使用到的几率并不是很大，所以大致了解一些简单的使用基本就可以了。
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