Spring 零基础入门WebFlux框架体系
作者：xharvard
传统的基于Servlet的Web框架，如Spring MVC,在本质上都是阻塞和多线程的，每个连接都会使用一个线程。在请求处理的时候，会在线程池中拉取一个工作者( worker )线程来对请求进行处理。同时，请求线程是阻塞的，直到工作者线程提示它已经完成为止。
首先webflux不是spring mvc的替代方案！webflux强调的是异步非阻塞，spring mvc强调的是同步阻塞，如果方案大部分偏向于非同步，则spring webflux才是首选。另外，如果依赖了大量阻塞式持久化 API 和网络 API，建议使⽤ Spring MVC。
WebMVC：springMvc构建在servlet api之上,因此需要Servlet容器(比如Tomcat)才能执行。使用的是同步阻塞式IO模型，每一个请求对应一个线程去处理。
WebFlux：spring webflux是一个异步非阻塞式的web框架，它能够充分利用多核cpu的硬件资源去处理大量的并发请求。
相同之处
都可以使用springmvc注解，如@Controller，方便我们在两个web框架中自由转换；
都可以使用tomcat，jetty，undertow, servlet容器（servlet 3.1+）
注意点：
spring mvc因为是使用的同步阻塞式，更方便开发人员编写功能，debug测试等，一般来说，如果spring mvc能够满足的场景，就尽量不要用webflux；
使用WebFlux有一个很有 意思的副作用， 即WebFlux 的默认嵌人式服务器是Netty而不是Tomcat。Netty 是一个异步 、事件驱动的服务器，非常适合Spring WebFlux这样的反应式Web框架。
Spring WebFlux的控制器方法要接受和返回反应式类型，如Mono和Flux,而不是领域类型和集合。
SpringWebflux 实现方式有两种：注解编程模型和函数式编程模型
基于注解编程模型
该模型与Spring MVC很相似。甚至注解都一样。
搭建一个简易的Spring WebFlux工程：
1，到https://start.spring.io/创建spring boot工程，选择Spring Reactive Web 依赖。
2，导入到IDEA,创建controller, service, entity 等包
3，创建entity
public class User {
private int id;
private String name;
public User() {
}
public User(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}4，创建service 这里使用map模拟数据库操作
public interface UserService {
Mono<User> selectById(int id);
Flux<User> selectAllUsers();
Mono<Void> insertUser(Mono<User> user);
}
@Repository
public class UserServiceImpl implements UserService {
private static Map<Integer, User> users = new HashMap<>();
public UserServiceImpl() {
users.put(1, new User(1, "刘备"));
users.put(2, new User(2, "曹操"));
users.put(3, new User(3, "孙权"));
}
@Override
public Mono<User> selectById(int id) {
return Mono.just(users.get(id));
}
@Override
public Flux<User> selectAllUsers() {
return Flux.fromIterable(users.values());
}
@Override
public Mono<Void> insertUser(Mono<User> userMono) {
return userMono.doOnNext(user -> {
int id = users.size() + 1;
users.put(id, user);
}).thenEmpty(Mono.empty());
}
}5,创建controller
@RestController
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/users/{id}")
public Mono<User> getUser(@PathVariable int id) {
return userService.selectById(id);
}
@GetMapping("/users")
public Flux<User> getAllUsers() {
return userService.selectAllUsers();
}
}6，启动 SringBoot，这里修改了端口号为9999
"D:\Program Files\java\tsjdk64\bin\java.exe" -Dvisualvm.id=31217450973500 "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.2\lib\idea_rt.jar=64346:D:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.1.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program Files\java\tsjdk64\jre\lib\charsets.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\access-bridge-64.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\cldrdata.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\dnsns.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\jaccess.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\localedata.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\nashorn.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\sunec.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\sunjce_provider.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\sunmscapi.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\sunpkcs11.jar;D:\Program Files\java\tsjdk64\jre\lib\ext\zipfs.jar;D:\Program Files\java\tsjdk64\jre\lib\jce.jar;D:\Program Files\java\tsjdk64\jre\lib\jfr.jar;D:\Program Files\java\tsjdk64\jre\lib\jsse.jar;D:\Program Files\java\tsjdk64\jre\lib\management-agent.jar;D:\Program Files\java\tsjdk64\jre\lib\resources.jar;D:\Program Files\java\tsjdk64\jre\lib\rt.jar;D:\05_spring_dev\java-study\spring-webflux\target\classes;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-webflux\2.7.1\spring-boot-starter-webflux-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter\2.7.1\spring-boot-starter-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot\2.7.1\spring-boot-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-context\5.3.21\spring-context-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-aop\5.3.21\spring-aop-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-expression\5.3.21\spring-expression-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-autoconfigure\2.7.1\spring-boot-autoconfigure-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-logging\2.7.1\spring-boot-starter-logging-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\ch\qos\logback\logback-classic\1.2.11\logback-classic-1.2.11.jar;D:\Program Files\apache-maven-3.6.3\repo\ch\qos\logback\logback-core\1.2.11\logback-core-1.2.11.jar;D:\Program Files\apache-maven-3.6.3\repo\org\apache\logging\log4j\log4j-to-slf4j\2.17.2\log4j-to-slf4j-2.17.2.jar;D:\Program Files\apache-maven-3.6.3\repo\org\apache\logging\log4j\log4j-api\2.17.2\log4j-api-2.17.2.jar;D:\Program Files\apache-maven-3.6.3\repo\org\slf4j\jul-to-slf4j\1.7.36\jul-to-slf4j-1.7.36.jar;D:\Program Files\apache-maven-3.6.3\repo\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\Program Files\apache-maven-3.6.3\repo\org\yaml\snakeyaml\1.30\snakeyaml-1.30.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-json\2.7.1\spring-boot-starter-json-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-databind\2.13.3\jackson-databind-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-annotations\2.13.3\jackson-annotations-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-core\2.13.3\jackson-core-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.3\jackson-datatype-jdk8-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.3\jackson-datatype-jsr310-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.3\jackson-module-parameter-names-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-reactor-netty\2.7.1\spring-boot-starter-reactor-netty-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\netty\reactor-netty-http\1.0.20\reactor-netty-http-1.0.20.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-http\4.1.78.Final\netty-codec-http-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-common\4.1.78.Final\netty-common-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-buffer\4.1.78.Final\netty-buffer-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport\4.1.78.Final\netty-transport-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec\4.1.78.Final\netty-codec-4.1.78.Final.jar;D:\Program 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Files\apache-maven-3.6.3\repo\io\netty\netty-transport-native-epoll\4.1.78.Final\netty-transport-native-epoll-4.1.78.Final-linux-x86_64.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport-native-unix-common\4.1.78.Final\netty-transport-native-unix-common-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport-classes-epoll\4.1.78.Final\netty-transport-classes-epoll-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\netty\reactor-netty-core\1.0.20\reactor-netty-core-1.0.20.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-handler-proxy\4.1.78.Final\netty-handler-proxy-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-socks\4.1.78.Final\netty-codec-socks-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-web\5.3.21\spring-web-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-beans\5.3.21\spring-beans-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-webflux\5.3.21\spring-webflux-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-core\5.3.21\spring-core-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-jcl\5.3.21\spring-jcl-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\reactor-core\3.4.19\reactor-core-3.4.19.jar;D:\Program Files\apache-maven-3.6.3\repo\org\reactivestreams\reactive-streams\1.0.4\reactive-streams-1.0.4.jar" org.xharavard.webflux.WebfluxApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.7.1)
2022-07-14 17:05:21.976 INFO 10060 --- [ main] o.xharavard.webflux.WebfluxApplication : Starting WebfluxApplication using Java 1.8.0-taishan on LAPTOP-N89I5VOK with PID 10060 (D:\05_spring_dev\java-study\spring-webflux\target\classes started by xhh in D:\05_spring_dev\java-study)
2022-07-14 17:05:21.978 INFO 10060 --- [ main] o.xharavard.webflux.WebfluxApplication : No active profile set, falling back to 1 default profile: "default"
2022-07-14 17:05:23.635 INFO 10060 --- [ main] o.s.b.web.embedded.netty.NettyWebServer : Netty started on port 9999
2022-07-14 17:05:23.640 INFO 10060 --- [ main] o.xharavard.webflux.WebfluxApplication : Started WebfluxApplication in 2.045 seconds (JVM running for 2.394)
7，访问
浏览器输入：http://localhost:9999/users/1
返回 {"id":1,"name":"刘备"}
函数式编程模型
（1）在使用函数式编程模型操作时候，需要自己初始化服务器
（2）基于函数式编程模型时候，有两个核心接口：RouterFunction（实现路由功能，请求转发给对应的 handler）和 HandlerFunction（处理请求生成响应的函数）。核心任务定义两个函数式接口的实现并且启动需要的服务器。
（3）Spring WebFlux 请 求 和 响 应 不 再 是 ServletRequest 和 ServletResponse ，而是ServerRequest 和 ServerResponse
1，entity和service同之前一样
2，创建Handler
public class UserHandler {
@Autowired
private final UserService userService;
public UserHandler(UserService userService) {
this.userService = userService;
}
public Mono<ServerResponse> getUserById(ServerRequest request) {
int userId = Integer.parseInt(request.pathVariable("id"));
//空值处理
Mono<ServerResponse> notFount = ServerResponse.notFound().build();
Mono<User> userMono = this.userService.selectById(userId);
return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(userMono, User.class)
.switchIfEmpty(notFount);
}
public Mono<ServerResponse> getAllUsers(ServerRequest request) {
Flux<User> users = this.userService.selectAllUsers();
return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(users, User.class);
}
}3，初始化服务器，编写 Router
public class Server {
public static void main(String[] args) throws IOException {
Server server = new Server();
server.createReactorServer();
System.out.println("enter to exit");
System.in.read();
}
// 创建路由
public RouterFunction<ServerResponse> routingFunction() {
UserService userService = new UserServiceImpl();
UserHandler userHandler = new UserHandler(userService);
return RouterFunctions
.route(GET("/users/{id}").and(accept(MediaType.APPLICATION_JSON)), userHandler::getUserById)
.andRoute(GET("/users").and(accept(MediaType.APPLICATION_JSON)), userHandler::getAllUsers);
}
// 创建服务器完成适配
public void createReactorServer() {
//路由和Handler适配
RouterFunction<ServerResponse> route = routingFunction();
HttpHandler httpHandler = toHttpHandler(route);
ReactorHttpHandlerAdapter adapter = new ReactorHttpHandlerAdapter(httpHandler);
//创建服务器
HttpServer httpServer = HttpServer.create();
httpServer.handle(adapter).bindNow();
}
}启动上述程序
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Files\java\tsjdk64\jre\lib\jce.jar;D:\Program Files\java\tsjdk64\jre\lib\jfr.jar;D:\Program Files\java\tsjdk64\jre\lib\jsse.jar;D:\Program Files\java\tsjdk64\jre\lib\management-agent.jar;D:\Program Files\java\tsjdk64\jre\lib\resources.jar;D:\Program Files\java\tsjdk64\jre\lib\rt.jar;D:\05_spring_dev\java-study\spring-webflux\target\classes;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-webflux\2.7.1\spring-boot-starter-webflux-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter\2.7.1\spring-boot-starter-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot\2.7.1\spring-boot-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-context\5.3.21\spring-context-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-aop\5.3.21\spring-aop-5.3.21.jar;D:\Program 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Files\apache-maven-3.6.3\repo\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\Program Files\apache-maven-3.6.3\repo\org\yaml\snakeyaml\1.30\snakeyaml-1.30.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-json\2.7.1\spring-boot-starter-json-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-databind\2.13.3\jackson-databind-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-annotations\2.13.3\jackson-annotations-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\core\jackson-core\2.13.3\jackson-core-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.3\jackson-datatype-jdk8-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.3\jackson-datatype-jsr310-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.3\jackson-module-parameter-names-2.13.3.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\boot\spring-boot-starter-reactor-netty\2.7.1\spring-boot-starter-reactor-netty-2.7.1.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\netty\reactor-netty-http\1.0.20\reactor-netty-http-1.0.20.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-http\4.1.78.Final\netty-codec-http-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-common\4.1.78.Final\netty-common-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-buffer\4.1.78.Final\netty-buffer-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport\4.1.78.Final\netty-transport-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec\4.1.78.Final\netty-codec-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-handler\4.1.78.Final\netty-handler-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-http2\4.1.78.Final\netty-codec-http2-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-resolver-dns\4.1.78.Final\netty-resolver-dns-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-resolver\4.1.78.Final\netty-resolver-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-dns\4.1.78.Final\netty-codec-dns-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-resolver-dns-native-macos\4.1.78.Final\netty-resolver-dns-native-macos-4.1.78.Final-osx-x86_64.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-resolver-dns-classes-macos\4.1.78.Final\netty-resolver-dns-classes-macos-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport-native-epoll\4.1.78.Final\netty-transport-native-epoll-4.1.78.Final-linux-x86_64.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport-native-unix-common\4.1.78.Final\netty-transport-native-unix-common-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-transport-classes-epoll\4.1.78.Final\netty-transport-classes-epoll-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\netty\reactor-netty-core\1.0.20\reactor-netty-core-1.0.20.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-handler-proxy\4.1.78.Final\netty-handler-proxy-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\io\netty\netty-codec-socks\4.1.78.Final\netty-codec-socks-4.1.78.Final.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-web\5.3.21\spring-web-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-beans\5.3.21\spring-beans-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-webflux\5.3.21\spring-webflux-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\slf4j\slf4j-api\1.7.36\slf4j-api-1.7.36.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-core\5.3.21\spring-core-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\org\springframework\spring-jcl\5.3.21\spring-jcl-5.3.21.jar;D:\Program Files\apache-maven-3.6.3\repo\io\projectreactor\reactor-core\3.4.19\reactor-core-3.4.19.jar;D:\Program Files\apache-maven-3.6.3\repo\org\reactivestreams\reactive-streams\1.0.4\reactive-streams-1.0.4.jar" org.xharavard.webflux.Server
17:34:57.051 [main] DEBUG reactor.util.Loggers - Using Slf4j logging framework
17:34:57.299 [main] DEBUG org.springframework.web.server.adapter.HttpWebHandlerAdapter - enableLoggingRequestDetails='false': form data and headers will be masked to prevent unsafe logging of potentially sensitive data
17:34:57.331 [main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework
17:34:57.333 [main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false
17:34:57.333 [main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 8
17:34:57.334 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe: available
17:34:57.334 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.copyMemory: available
17:34:57.334 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.storeFence: available
17:34:57.335 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Buffer.address: available
17:34:57.335 [main] DEBUG io.netty.util.internal.PlatformDependent0 - direct buffer constructor: available
17:34:57.341 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.Bits.unaligned: available, true
17:34:57.341 [main] DEBUG io.netty.util.internal.PlatformDependent0 - jdk.internal.misc.Unsafe.allocateUninitializedArray(int): unavailable prior to Java9
17:34:57.341 [main] DEBUG io.netty.util.internal.PlatformDependent0 - java.nio.DirectByteBuffer.<init>(long, int): available
17:34:57.341 [main] DEBUG io.netty.util.internal.PlatformDependent - sun.misc.Unsafe: available
17:34:57.342 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.tmpdir: C:\Users\xhh\AppData\Local\Temp (java.io.tmpdir)
17:34:57.342 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.bitMode: 64 (sun.arch.data.model)
17:34:57.342 [main] DEBUG io.netty.util.internal.PlatformDependent - Platform: Windows
17:34:57.343 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.maxDirectMemory: 3787980800 bytes
17:34:57.343 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.uninitializedArrayAllocationThreshold: -1
17:34:57.344 [main] DEBUG io.netty.util.internal.CleanerJava6 - java.nio.ByteBuffer.cleaner(): available
17:34:57.344 [main] DEBUG io.netty.util.internal.PlatformDependent - -Dio.netty.noPreferDirect: false
17:34:57.352 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.initialSize: 1024
17:34:57.352 [main] DEBUG io.netty.util.internal.InternalThreadLocalMap - -Dio.netty.threadLocalMap.stringBuilder.maxSize: 4096
17:34:57.375 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.level: simple
17:34:57.375 [main] DEBUG io.netty.util.ResourceLeakDetector - -Dio.netty.leakDetection.targetRecords: 4
17:34:57.400 [main] DEBUG reactor.netty.tcp.TcpResources - [http] resources will use the default LoopResources: DefaultLoopResources {prefix=reactor-http, daemon=true, selectCount=8, workerCount=8}
17:34:57.400 [main] DEBUG reactor.netty.tcp.TcpResources - [http] resources will use the default ConnectionProvider: reactor.netty.resources.DefaultPooledConnectionProvider@65f095f8
17:34:57.401 [main] DEBUG reactor.netty.resources.DefaultLoopIOUring - Default io_uring support : false
17:34:57.654 [main] DEBUG reactor.netty.resources.DefaultLoopEpoll - Default Epoll support : false
17:34:57.655 [main] DEBUG reactor.netty.resources.DefaultLoopKQueue - Default KQueue support : false
17:34:57.660 [main] DEBUG io.netty.channel.MultithreadEventLoopGroup - -Dio.netty.eventLoopThreads: 16
17:34:57.678 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.noKeySetOptimization: false
17:34:57.678 [main] DEBUG io.netty.channel.nio.NioEventLoop - -Dio.netty.selectorAutoRebuildThreshold: 512
17:34:57.686 [main] DEBUG io.netty.util.internal.PlatformDependent - org.jctools-core.MpscChunkedArrayQueue: available
17:34:57.707 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.processId: 8008 (auto-detected)
17:34:57.709 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv4Stack: false
17:34:57.709 [main] DEBUG io.netty.util.NetUtil - -Djava.net.preferIPv6Addresses: false
17:34:57.851 [main] DEBUG io.netty.util.NetUtilInitializations - Loopback interface: lo (Software Loopback Interface 1, 127.0.0.1)
17:34:57.852 [main] DEBUG io.netty.util.NetUtil - Failed to get SOMAXCONN from sysctl and file \proc\sys\net\core\somaxconn. Default: 200
17:34:57.990 [main] DEBUG io.netty.channel.DefaultChannelId - -Dio.netty.machineId: 8c:c6:81:ff:fe:4c:01:12 (auto-detected)
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numHeapArenas: 16
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.numDirectArenas: 16
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.pageSize: 8192
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxOrder: 9
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.chunkSize: 4194304
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.smallCacheSize: 256
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.normalCacheSize: 64
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedBufferCapacity: 32768
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimInterval: 8192
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.cacheTrimIntervalMillis: 0
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.useCacheForAllThreads: false
17:34:58.005 [main] DEBUG io.netty.buffer.PooledByteBufAllocator - -Dio.netty.allocator.maxCachedByteBuffersPerChunk: 1023
17:34:58.010 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.allocator.type: pooled
17:34:58.010 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.threadLocalDirectBufferSize: 0
17:34:58.010 [main] DEBUG io.netty.buffer.ByteBufUtil - -Dio.netty.maxThreadLocalCharBufferSize: 16384
17:34:58.077 [reactor-http-nio-1] DEBUG reactor.netty.transport.ServerTransport - [c9915a48, L:/0:0:0:0:0:0:0:0:65129] Bound new server
enter to exit
17:35:05.073 [reactor-http-nio-2] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.checkAccessible: true
17:35:05.074 [reactor-http-nio-2] DEBUG io.netty.buffer.AbstractByteBuf - -Dio.netty.buffer.checkBounds: true
17:35:05.074 [reactor-http-nio-2] DEBUG io.netty.util.ResourceLeakDetectorFactory - Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@301be937
17:35:05.102 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] New http connection, requesting read
17:35:05.102 [reactor-http-nio-3] DEBUG reactor.netty.http.server.HttpServerOperations - [1a0030eb, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65131] New http connection, requesting read
17:35:05.102 [reactor-http-nio-3] DEBUG reactor.netty.transport.TransportConfig - [1a0030eb, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65131] Initialized pipeline DefaultChannelPipeline{(reactor.left.httpCodec = io.netty.handler.codec.http.HttpServerCodec), (reactor.left.httpTrafficHandler = reactor.netty.http.server.HttpTrafficHandler), (reactor.right.reactiveBridge = reactor.netty.channel.ChannelOperationsHandler)}
17:35:05.102 [reactor-http-nio-2] DEBUG reactor.netty.transport.TransportConfig - [09cda6a3, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Initialized pipeline DefaultChannelPipeline{(reactor.left.httpCodec = io.netty.handler.codec.http.HttpServerCodec), (reactor.left.httpTrafficHandler = reactor.netty.http.server.HttpTrafficHandler), (reactor.right.reactiveBridge = reactor.netty.channel.ChannelOperationsHandler)}
17:35:05.106 [reactor-http-nio-2] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.maxCapacityPerThread: 4096
17:35:05.106 [reactor-http-nio-2] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.ratio: 8
17:35:05.106 [reactor-http-nio-2] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.chunkSize: 32
17:35:05.106 [reactor-http-nio-2] DEBUG io.netty.util.Recycler - -Dio.netty.recycler.blocking: false
17:35:05.119 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Increasing pending responses, now 1
17:35:05.124 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServer - [09cda6a3-1, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Handler is being applied: org.springframework.http.server.reactive.ReactorHttpHandlerAdapter@3bc10f7a
17:35:05.138 [reactor-http-nio-2] DEBUG org.springframework.web.server.adapter.HttpWebHandlerAdapter - [09cda6a3-1] HTTP GET "/users/1"
17:35:05.238 [reactor-http-nio-2] DEBUG org.springframework.http.codec.json.Jackson2JsonEncoder - [09cda6a3-1] Encoding [org.xharavard.webflux.entity.User@39412266]
17:35:05.252 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-1, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Decreasing pending responses, now 0
17:35:05.252 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-1, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Last HTTP packet was sent, terminating the channel
17:35:05.253 [reactor-http-nio-2] DEBUG org.springframework.web.server.adapter.HttpWebHandlerAdapter - [09cda6a3-1] Completed 200 OK
17:35:05.256 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-1, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Last HTTP response frame
17:35:05.488 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Increasing pending responses, now 1
17:35:05.488 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServer - [09cda6a3-2, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Handler is being applied: org.springframework.http.server.reactive.ReactorHttpHandlerAdapter@3bc10f7a
17:35:05.488 [reactor-http-nio-2] DEBUG org.springframework.web.server.adapter.HttpWebHandlerAdapter - [09cda6a3-2] HTTP GET "/favicon.ico"
17:35:05.494 [reactor-http-nio-2] DEBUG org.springframework.web.server.handler.ResponseStatusExceptionHandler - [09cda6a3-2] Resolved [ResponseStatusException: "404 NOT_FOUND "No matching router function""] for HTTP GET /favicon.ico
17:35:05.494 [reactor-http-nio-2] DEBUG org.springframework.web.server.adapter.HttpWebHandlerAdapter - [09cda6a3-2] Completed 404 NOT_FOUND
17:35:05.494 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-2, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Last HTTP response frame
17:35:05.494 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-2, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] No sendHeaders() called before complete, sending zero-length header
17:35:05.494 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-2, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Decreasing pending responses, now 0
17:35:05.494 [reactor-http-nio-2] DEBUG reactor.netty.http.server.HttpServerOperations - [09cda6a3-2, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] Last HTTP packet was sent, terminating the channel
17:35:05.495 [reactor-http-nio-2] DEBUG reactor.netty.channel.ChannelOperationsHandler - [09cda6a3, L:/0:0:0:0:0:0:0:1:65129 - R:/0:0:0:0:0:0:0:1:65130] No ChannelOperation attached. Dropping: EmptyLastHttpContent
浏览器输入：http://localhost:65129/users
返回[{"id":1,"name":"刘备"},{"id":2,"name":"曹操"},{"id":3,"name":"孙权"}]
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