spring boot使用WebClient调用HTTP服务代码示例

这篇文章主要介绍了spring boot使用WebClient调用HTTP服务代码示例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

WebClient的请求模式属于异步非阻塞，能够以少量固定的线程处理高并发的HTTP请求

WebClient是Spring WebFlux模块提供的一个非阻塞的基于响应式编程的进行Http请求的客户端工具，从Spring5.0开始提供

在Spring Boot应用中

1.添加Spring WebFlux依赖

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

2.使用

（1）Restful接口demoController.java

package com.example.demo.controller;

import com.example.demo.domain.MyData;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;

@RestController
@RequestMapping("/api")
public class demoController {

  @GetMapping(value = "/getHeader", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
  public MyData getHeader(HttpServletRequest request) {

    int id = 0;
    if (request.getParameter("id") != null) {
      id = Integer.valueOf(request.getParameter("id"));
    }
    String name = request.getParameter("name");
    //header
    String userAgent = "USER_AGENT——" + request.getHeader(HttpHeaders.USER_AGENT);
    userAgent += " | ACCEPT_CHARSET——" + request.getHeader(HttpHeaders.ACCEPT_CHARSET);
    userAgent += " | ACCEPT_ENCODING——" + request.getHeader(HttpHeaders.ACCEPT_ENCODING);
    userAgent += " | ContextPath——" + request.getContextPath();
    userAgent += " | AuthType——" + request.getAuthType();
    userAgent += " | PathInfo——" + request.getPathInfo();
    userAgent += " | Method——" + request.getMethod();
    userAgent += " | QueryString——" + request.getQueryString();
    Cookie[] cookies = request.getCookies();
    if (cookies != null) {
      for (Cookie cookie : cookies) {
        System.out.println(cookie.getName() + "：" + cookie.getValue());
      }
    }
    MyData data = new MyData();
    data.setId(id);
    data.setName(name);
    data.setOther(userAgent);
    return data;
  }

  @PostMapping(value = "/getPost", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
  public MyData getPost(HttpServletRequest request) {

    int id = 0;
    if (request.getParameter("id") != null) {
      id = Integer.valueOf(request.getParameter("id"));
    }
    String name = request.getParameter("name");
    System.out.println(name + "," + id);
    MyData data = new MyData();
    data.setId(id);
    data.setName(name);
    return data;

  }
  /**
   * POST传JSON请求
   */
  @PostMapping(value = "/getPostJson", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
  public MyData getPostJson(@RequestBody(required = true) MyData data) {
    System.out.println(data.getId());
    System.out.println(data.getName());
    return data;
  }
}

MyData.java

package com.example.demo.domain;

public class MyData {
  private int id;
  private String name;
  private String other;
  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;
  }

  public String getOther() {
    return other;
  }

  public void setOther(String other) {
    this.other = other;
  }
}

（2）WebClient使用

DemoApplicationTests.java

package com.example.demo;

import com.example.demo.domain.MyData;
import org.junit.Test;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;

import java.time.Duration;
import java.time.temporal.ChronoUnit;

public class DemoApplicationTests {

  private WebClient webClient = WebClient.builder()
      .baseUrl("http://127.0.0.1:8080")
      .defaultHeader(HttpHeaders.USER_AGENT, "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)")
      .defaultCookie("ACCESS_TOKEN", "test_token").build();

  @Test
  public void WebGetDemo() {

    try {
      Mono<MyData> resp = webClient.method(HttpMethod.GET).uri("api/getHeader?id={id}&name={name}", 123, "abc")
          .retrieve()
          .bodyToMono(MyData.class);
      MyData data = resp.block();
      System.out.println("WebGetDemo result----- " + data.getString());
    } catch (Exception e) {
      e.printStackTrace();
    }

  }

  @Test
  public void WebPostDemo() {
    MultiValueMap<String, String> formData = new LinkedMultiValueMap<>(2);
    formData.add("id", "456");
    formData.add("name", "xyz");

    Mono<MyData> response = webClient.method(HttpMethod.POST).uri("/api/getPost")
        .contentType(MediaType.APPLICATION_FORM_URLENCODED)
        .body(BodyInserters.fromFormData(formData))
        .retrieve()
        .bodyToMono(MyData.class).timeout(Duration.of(10, ChronoUnit.SECONDS));
    System.out.println(response);
    MyData data = response.block();
    System.out.println("WebPostDemo result----- " + data.getString());
  }

  @Test
  public void WebPostJson() {
    MyData requestData = new MyData();
    requestData.setId(789);
    requestData.setName("lmn");

    Mono<MyData> response = webClient.post().uri("/api/getPostJson")
        .contentType(MediaType.APPLICATION_JSON_UTF8)
        .syncBody(requestData)
        .retrieve()
        .bodyToMono(MyData.class).timeout(Duration.of(10, ChronoUnit.SECONDS));

    MyData data = response.block();
    System.out.println("WebPostJson result----- " + data.getString());
  }

}

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