Merge pull request #10452 from rozagerardo/rozagerardo/JAVA-4311_improve-spring-5-weblcient-article
[JAVA-4311] Improve "Spring Webclient" article
This commit is contained in:
Loredana Crusoveanu
GitHub
commit
dd2ecbb9ee
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@ -1,6 +1,7 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-5-reactive</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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@ -73,6 +74,12 @@
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<artifactId>spring-security-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>io.projectreactor</groupId>
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<artifactId>reactor-test</artifactId>
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<scope>test</scope>
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</dependency>
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<!-- Spring WebFlux WebSession -->
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<dependency>
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@ -0,0 +1,24 @@
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package com.baeldung.web.reactive.client;
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public class Foo {
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private String name;
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public Foo() {
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super();
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}
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public Foo(String name) {
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super();
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this.name = name;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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}
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@ -2,9 +2,10 @@ package com.baeldung.web.reactive.client;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration;
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@SpringBootApplication
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public class WebClientApplication{
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@SpringBootApplication(exclude = { ReactiveSecurityAutoConfiguration.class })
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public class WebClientApplication {
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public static void main(String[] args) {
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SpringApplication.run(WebClientApplication.class, args);
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@ -1,36 +1,18 @@
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package com.baeldung.web.reactive.client;
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import java.net.URI;
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import java.nio.charset.Charset;
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import java.time.ZonedDateTime;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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import org.reactivestreams.Publisher;
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import org.reactivestreams.Subscriber;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.ReactiveHttpOutputMessage;
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import org.springframework.http.client.reactive.ClientHttpRequest;
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import org.springframework.http.client.reactive.ReactorClientHttpConnector;
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import org.springframework.util.LinkedMultiValueMap;
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import org.springframework.util.MultiValueMap;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestPart;
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import org.springframework.web.bind.annotation.ResponseStatus;
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import org.springframework.web.bind.annotation.RestController;
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import org.springframework.web.reactive.function.BodyInserter;
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import org.springframework.web.reactive.function.BodyInserters;
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import org.springframework.web.reactive.function.client.WebClient;
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import io.netty.channel.ChannelOption;
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import io.netty.handler.timeout.ReadTimeoutHandler;
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import io.netty.handler.timeout.WriteTimeoutHandler;
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import reactor.core.publisher.Mono;
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import reactor.netty.http.client.HttpClient;
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@RestController
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public class WebClientController {
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@ -43,74 +25,18 @@ public class WebClientController {
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return response;
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}
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public void demonstrateWebClient() {
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// request
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WebClient.UriSpec<WebClient.RequestBodySpec> request1 = createWebClientWithServerURLAndDefaultValues().method(HttpMethod.POST);
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WebClient.UriSpec<WebClient.RequestBodySpec> request2 = createWebClientWithServerURLAndDefaultValues().post();
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// request body specifications
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WebClient.RequestBodySpec uri1 = createWebClientWithServerURLAndDefaultValues().method(HttpMethod.POST)
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.uri("/resource");
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WebClient.RequestBodySpec uri2 = createWebClientWithServerURLAndDefaultValues().post()
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.uri(URI.create("/resource"));
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// request header specification
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WebClient.RequestHeadersSpec<?> requestSpec1 = uri1.body(BodyInserters.fromPublisher(Mono.just("data"), String.class));
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WebClient.RequestHeadersSpec<?> requestSpec2 = uri2.body(BodyInserters.fromValue("data"));
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// inserters
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BodyInserter<Publisher<String>, ReactiveHttpOutputMessage> inserter1 = BodyInserters.fromPublisher(Subscriber::onComplete, String.class);
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LinkedMultiValueMap<String, String> map = new LinkedMultiValueMap<>();
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map.add("key1", "value1");
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map.add("key2", "value2");
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BodyInserter<MultiValueMap<String, Object>, ClientHttpRequest> inserter2 = BodyInserters.fromMultipartData(map);
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BodyInserter<Object, ReactiveHttpOutputMessage> inserter3 = BodyInserters.fromValue(new Object());
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BodyInserter<String, ReactiveHttpOutputMessage> inserter4 = BodyInserters.fromValue("body");
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// responses
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WebClient.ResponseSpec response1 = uri1.body(inserter3)
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.header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
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.accept(MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML)
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.acceptCharset(Charset.forName("UTF-8"))
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.ifNoneMatch("*")
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.ifModifiedSince(ZonedDateTime.now())
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.retrieve();
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String response2 = uri1.exchangeToMono(response -> response.bodyToMono(String.class))
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.block();
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String response3 = uri2.retrieve()
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.bodyToMono(String.class)
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.block();
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WebClient.ResponseSpec response4 = requestSpec2.retrieve();
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@PostMapping("/resource")
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public Mono<String> postStringResource(@RequestBody Mono<String> bodyString) {
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return bodyString.map(body -> "processed-" + body);
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}
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private WebClient createWebClient() {
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return WebClient.create();
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@PostMapping("/resource-foo")
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public Mono<String> postFooResource(@RequestBody Mono<Foo> bodyFoo) {
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return bodyFoo.map(foo -> "processedFoo-" + foo.getName());
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}
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private WebClient createWebClientWithServerURL() {
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return WebClient.create("http://localhost:8081");
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@PostMapping(value = "/resource-multipart", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
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public String handleFormUpload(@RequestPart("key1") String value1, @RequestPart("key2") String value2) {
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return "processed-" + value1 + "-" + value2;
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}
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private WebClient createWebClientConfiguringTimeout() {
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HttpClient httpClient = HttpClient.create()
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.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5000)
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.doOnConnected(conn -> conn.addHandlerLast(new ReadTimeoutHandler(5000, TimeUnit.MILLISECONDS))
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.addHandlerLast(new WriteTimeoutHandler(5000, TimeUnit.MILLISECONDS)));
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return WebClient.builder()
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.clientConnector(new ReactorClientHttpConnector(httpClient))
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.build();
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}
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private WebClient createWebClientWithServerURLAndDefaultValues() {
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return WebClient.builder()
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.baseUrl("http://localhost:8081")
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.defaultCookie("cookieKey", "cookieValue")
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.defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
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.defaultUriVariables(Collections.singletonMap("url", "http://localhost:8080"))
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.build();
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}
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}
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@ -0,0 +1,331 @@
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package com.baeldung.web.client;
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import static org.assertj.core.api.Assertions.assertThat;
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import java.net.URI;
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import java.nio.charset.StandardCharsets;
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import java.time.Duration;
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import java.time.ZonedDateTime;
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import java.util.Collections;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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import org.junit.jupiter.api.Test;
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import org.reactivestreams.Publisher;
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import org.reactivestreams.Subscriber;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
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import org.springframework.boot.web.server.LocalServerPort;
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import org.springframework.core.ParameterizedTypeReference;
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import org.springframework.core.codec.CodecException;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpMethod;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.ReactiveHttpOutputMessage;
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import org.springframework.http.client.reactive.ClientHttpRequest;
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import org.springframework.http.client.reactive.ReactorClientHttpConnector;
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import org.springframework.util.LinkedMultiValueMap;
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import org.springframework.util.MultiValueMap;
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import org.springframework.web.reactive.function.BodyInserter;
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import org.springframework.web.reactive.function.BodyInserters;
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import org.springframework.web.reactive.function.client.WebClient;
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import org.springframework.web.reactive.function.client.WebClient.RequestBodySpec;
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import org.springframework.web.reactive.function.client.WebClient.RequestBodyUriSpec;
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import org.springframework.web.reactive.function.client.WebClient.RequestHeadersSpec;
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import org.springframework.web.reactive.function.client.WebClient.RequestHeadersUriSpec;
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import org.springframework.web.reactive.function.client.WebClient.ResponseSpec;
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import org.springframework.web.reactive.function.client.WebClientRequestException;
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import com.baeldung.web.reactive.client.Foo;
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import com.baeldung.web.reactive.client.WebClientApplication;
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import io.netty.channel.ChannelOption;
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import io.netty.handler.timeout.ReadTimeoutHandler;
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import io.netty.handler.timeout.WriteTimeoutHandler;
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import reactor.core.publisher.Mono;
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import reactor.netty.http.client.HttpClient;
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import reactor.test.StepVerifier;
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@SpringBootTest(classes = WebClientApplication.class, webEnvironment = WebEnvironment.RANDOM_PORT)
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public class WebClientIntegrationTest {
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@LocalServerPort
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private int port;
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private static final String BODY_VALUE = "bodyValue";
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private static final ParameterizedTypeReference<Map<String, String>> MAP_RESPONSE_REF = new ParameterizedTypeReference<Map<String, String>>() {
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};
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@Test
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public void givenDifferentWebClientCreationMethods_whenUsed_thenObtainExpectedResponse() {
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// WebClient creation
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WebClient client1 = WebClient.create();
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WebClient client2 = WebClient.create("http://localhost:" + port);
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WebClient client3 = WebClient.builder()
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.baseUrl("http://localhost:" + port)
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.defaultCookie("cookieKey", "cookieValue")
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.defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
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.defaultUriVariables(Collections.singletonMap("url", "http://localhost:8080"))
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.build();
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// response assertions
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StepVerifier.create(retrieveResponse(client1.post()
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.uri("http://localhost:" + port + "/resource")))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(client2))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(client3))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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// assert response without specifying URI
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StepVerifier.create(retrieveResponse(client1))
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.expectErrorMatches(ex -> WebClientRequestException.class.isAssignableFrom(ex.getClass()) && ex.getMessage()
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.contains("Connection refused"))
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.verify();
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}
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@Test
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public void givenDifferentMethodSpecifications_whenUsed_thenObtainExpectedResponse() {
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// request specification
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RequestBodyUriSpec uriSpecPost1 = createDefaultClient().method(HttpMethod.POST);
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RequestBodyUriSpec uriSpecPost2 = createDefaultClient().post();
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RequestHeadersUriSpec<?> requestGet = createDefaultClient().get();
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// response assertions
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StepVerifier.create(retrieveResponse(uriSpecPost1))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(uriSpecPost2))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveGetResponse(requestGet))
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.expectNextMatches(nextMap -> nextMap.get("field")
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.equals("value"))
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.verifyComplete();
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}
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@Test
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public void givenDifferentUriSpecifications_whenUsed_thenObtainExpectedResponse() {
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// uri specification
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RequestBodySpec bodySpecUsingString = createDefaultPostRequest().uri("/resource");
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RequestBodySpec bodySpecUsingUriBuilder = createDefaultPostRequest().uri(uriBuilder -> uriBuilder.pathSegment("resource")
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.build());
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RequestBodySpec bodySpecusingURI = createDefaultPostRequest().uri(URI.create("http://localhost:" + port + "/resource"));
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RequestBodySpec bodySpecOverridenBaseUri = createDefaultPostRequest().uri(URI.create("/resource"));
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RequestBodySpec bodySpecOverridenBaseUri2 = WebClient.builder()
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.baseUrl("http://localhost:" + port)
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.build()
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.post()
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.uri(URI.create("/resource"));
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// response assertions
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StepVerifier.create(retrieveResponse(bodySpecUsingString))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(bodySpecUsingUriBuilder))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(bodySpecusingURI))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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// assert sending request overriding base URI
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StepVerifier.create(retrieveResponse(bodySpecOverridenBaseUri))
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.expectErrorMatches(ex -> WebClientRequestException.class.isAssignableFrom(ex.getClass()) && ex.getMessage()
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.contains("Connection refused"))
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.verify();
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StepVerifier.create(retrieveResponse(bodySpecOverridenBaseUri2))
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.expectErrorMatches(ex -> WebClientRequestException.class.isAssignableFrom(ex.getClass()) && ex.getMessage()
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.contains("Connection refused"))
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.verify();
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}
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@Test
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public void givenDifferentBodySpecifications_whenUsed_thenObtainExpectedResponse() {
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// request body specifications
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RequestHeadersSpec<?> headersSpecPost1 = createDefaultPostResourceRequest().body(BodyInserters.fromPublisher(Mono.just(BODY_VALUE), String.class));
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RequestHeadersSpec<?> headersSpecPost2 = createDefaultPostResourceRequest().body(BodyInserters.fromValue(BODY_VALUE));
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RequestHeadersSpec<?> headersSpecPost3 = createDefaultPostResourceRequest().bodyValue(BODY_VALUE);
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RequestHeadersSpec<?> headersSpecFooPost = createDefaultPostRequest().uri("/resource-foo")
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.body(Mono.just(new Foo("fooName")), Foo.class);
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BodyInserter<Object, ReactiveHttpOutputMessage> inserterPlainObject = BodyInserters.fromValue(new Object());
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RequestHeadersSpec<?> headersSpecPlainObject = createDefaultPostResourceRequest().body(inserterPlainObject);
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// request body specifications - using other inserter method (multipart request)
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LinkedMultiValueMap<String, String> map = new LinkedMultiValueMap<>();
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map.add("key1", "multipartValue1");
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map.add("key2", "multipartValue2");
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BodyInserter<MultiValueMap<String, Object>, ClientHttpRequest> inserterMultipart = BodyInserters.fromMultipartData(map);
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RequestHeadersSpec<?> headersSpecInserterMultipart = createDefaultPostRequest().uri("/resource-multipart")
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.body(inserterMultipart);
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// response assertions
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StepVerifier.create(retrieveResponse(headersSpecPost1))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(headersSpecPost2))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(headersSpecPost3))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(headersSpecFooPost))
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.expectNext("processedFoo-fooName")
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.verifyComplete();
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StepVerifier.create(retrieveResponse(headersSpecInserterMultipart))
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.expectNext("processed-multipartValue1-multipartValue2")
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.verifyComplete();
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// assert error plain `new Object()` as request body
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StepVerifier.create(retrieveResponse(headersSpecPlainObject))
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.expectError(CodecException.class)
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.verify();
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// assert response for request with no body
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Mono<Map<String, String>> responsePostWithNoBody = createDefaultPostResourceRequest().exchangeToMono(responseHandler -> {
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assertThat(responseHandler.statusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
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return responseHandler.bodyToMono(MAP_RESPONSE_REF);
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});
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StepVerifier.create(responsePostWithNoBody)
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.expectNextMatches(nextMap -> nextMap.get("error")
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.equals("Bad Request"))
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.verifyComplete();
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}
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@Test
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public void givenPostSpecifications_whenHeadersAdded_thenObtainExpectedResponse() {
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// request header specification
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RequestHeadersSpec<?> headersSpecInserterStringWithHeaders = createDefaultPostResourceRequestResponse().header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
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.accept(MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML)
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.acceptCharset(StandardCharsets.UTF_8)
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.ifNoneMatch("*")
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.ifModifiedSince(ZonedDateTime.now());
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// response assertions
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StepVerifier.create(retrieveResponse(headersSpecInserterStringWithHeaders))
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.expectNext("processed-bodyValue")
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.verifyComplete();
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}
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@Test
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public void givenDifferentResponseSpecifications_whenUsed_thenObtainExpectedResponse() {
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ResponseSpec responseSpecPostString = createDefaultPostResourceRequestResponse().retrieve();
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Mono<String> responsePostString = responseSpecPostString.bodyToMono(String.class);
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Mono<String> responsePostString2 = createDefaultPostResourceRequestResponse().exchangeToMono(response -> {
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if (response.statusCode()
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.equals(HttpStatus.OK)) {
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return response.bodyToMono(String.class);
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} else if (response.statusCode()
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.is4xxClientError()) {
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return Mono.just("Error response");
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} else {
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return response.createException()
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.flatMap(Mono::error);
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}
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});
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Mono<String> responsePostNoBody = createDefaultPostResourceRequest().exchangeToMono(response -> {
|
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if (response.statusCode()
|
||||
.equals(HttpStatus.OK)) {
|
||||
return response.bodyToMono(String.class);
|
||||
} else if (response.statusCode()
|
||||
.is4xxClientError()) {
|
||||
return Mono.just("Error response");
|
||||
} else {
|
||||
return response.createException()
|
||||
.flatMap(Mono::error);
|
||||
}
|
||||
});
|
||||
Mono<Map<String, String>> responseGet = createDefaultClient().get()
|
||||
.uri("/resource")
|
||||
.retrieve()
|
||||
.bodyToMono(MAP_RESPONSE_REF);
|
||||
|
||||
// response assertions
|
||||
StepVerifier.create(responsePostString)
|
||||
.expectNext("processed-bodyValue")
|
||||
.verifyComplete();
|
||||
StepVerifier.create(responsePostString2)
|
||||
.expectNext("processed-bodyValue")
|
||||
.verifyComplete();
|
||||
StepVerifier.create(responsePostNoBody)
|
||||
.expectNext("Error response")
|
||||
.verifyComplete();
|
||||
StepVerifier.create(responseGet)
|
||||
.expectNextMatches(nextMap -> nextMap.get("field")
|
||||
.equals("value"))
|
||||
.verifyComplete();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenWebClientWithTimeoutConfigurations_whenRequestUsingWronglyConfiguredPublisher_thenObtainTimeout() {
|
||||
HttpClient httpClient = HttpClient.create()
|
||||
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 1000)
|
||||
.responseTimeout(Duration.ofMillis(1000))
|
||||
.doOnConnected(conn -> conn.addHandlerLast(new ReadTimeoutHandler(1000, TimeUnit.MILLISECONDS))
|
||||
.addHandlerLast(new WriteTimeoutHandler(1000, TimeUnit.MILLISECONDS)));
|
||||
|
||||
WebClient timeoutClient = WebClient.builder()
|
||||
.clientConnector(new ReactorClientHttpConnector(httpClient))
|
||||
.build();
|
||||
|
||||
BodyInserter<Publisher<String>, ReactiveHttpOutputMessage> inserterCompleteSuscriber = BodyInserters.fromPublisher(Subscriber::onComplete, String.class);
|
||||
RequestHeadersSpec<?> headersSpecInserterCompleteSuscriber = timeoutClient.post()
|
||||
.uri("/resource")
|
||||
.body(inserterCompleteSuscriber);
|
||||
|
||||
StepVerifier.create(headersSpecInserterCompleteSuscriber.retrieve()
|
||||
.bodyToMono(String.class))
|
||||
.expectTimeout(Duration.ofMillis(2000))
|
||||
.verify();
|
||||
}
|
||||
|
||||
// helper methods to create default instances
|
||||
private WebClient createDefaultClient() {
|
||||
return WebClient.create("http://localhost:" + port);
|
||||
}
|
||||
|
||||
private RequestBodyUriSpec createDefaultPostRequest() {
|
||||
return createDefaultClient().post();
|
||||
}
|
||||
|
||||
private RequestBodySpec createDefaultPostResourceRequest() {
|
||||
return createDefaultPostRequest().uri("/resource");
|
||||
}
|
||||
|
||||
private RequestHeadersSpec<?> createDefaultPostResourceRequestResponse() {
|
||||
return createDefaultPostResourceRequest().bodyValue(BODY_VALUE);
|
||||
}
|
||||
|
||||
// helper methods to retrieve a response based on different steps of the process (specs)
|
||||
private Mono<String> retrieveResponse(WebClient client) {
|
||||
return client.post()
|
||||
.uri("/resource")
|
||||
.bodyValue(BODY_VALUE)
|
||||
.retrieve()
|
||||
.bodyToMono(String.class);
|
||||
}
|
||||
|
||||
private Mono<String> retrieveResponse(RequestBodyUriSpec spec) {
|
||||
return spec.uri("/resource")
|
||||
.bodyValue(BODY_VALUE)
|
||||
.retrieve()
|
||||
.bodyToMono(String.class);
|
||||
}
|
||||
|
||||
private Mono<Map<String, String>> retrieveGetResponse(RequestHeadersUriSpec<?> spec) {
|
||||
return spec.uri("/resource")
|
||||
.retrieve()
|
||||
.bodyToMono(MAP_RESPONSE_REF);
|
||||
}
|
||||
|
||||
private Mono<String> retrieveResponse(RequestBodySpec spec) {
|
||||
return spec.bodyValue(BODY_VALUE)
|
||||
.retrieve()
|
||||
.bodyToMono(String.class);
|
||||
}
|
||||
|
||||
private Mono<String> retrieveResponse(RequestHeadersSpec<?> spec) {
|
||||
return spec.retrieve()
|
||||
.bodyToMono(String.class);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue