Springboot3.4.x中的RestClient 和 RestTemplate

前言

Springboot3.4.x发布之后，对于RestClient 和 RestTemplate，添加了支持http客户端配置的支持

RestClient等配置

http客户端类型

Springboot3.4.x新增配置spring.http.client.factory，支持对http客户端的配置，支持的类型有

Apache HTTP Components (HttpComponentsClientHttpRequestFactory)

Jetty Client (JettyClientHttpRequestFactory)

Reactor Netty HttpClient (ReactorClientHttpRequestFactory)

JDK HttpClient (JdkClientHttpRequestFactory)

Simple JDK HttpURLConnection (SimpleClientHttpRequestFactory)

示例

新增一个controller类

@Slf4j
@RestController
public class HttpController {

    @RequestMapping("/hello")
    public String hello() {
        RestClient restClient = RestClient.create();
        String result = restClient.get().uri("http://localhost:8019/test").retrieve().body(String.class);
        log.info("返回结果为:{{}}", result);
        return "success";
    }

    @GetMapping("/test")
    public String test() {
        log.info("info日志");
        return "hello";
    }


}

application.properties配置如下

server.port=8019
spring.profiles.active=dev
spring.application.name=demo-rest-client

jdk

配置如下

spring:
  http:
    client:
      factory: jdk

访问

http://localhost:8019/hello

输出结果

http_components

这个需要加入httpclient5包

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents.client5/httpclient5 -->
<dependency>
    <groupId>org.apache.httpcomponents.client5</groupId>
    <artifactId>httpclient5</artifactId>
    <version>5.5</version>
</dependency>

http://localhost:8019/hello

输出结果

jetty

spring:
  http:
    client:
      factory: jetty

pom.xml配置加入

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <!-- 去除Tomcat容器 -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>


<!-- 增加Jetty容器 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

访问

http://localhost:8019/hello

输出结果

simple

spring:
  http:
    client:
      factory: simple

使用jdk默认的HttpURLConnection 访问

http://localhost:8019/hello

输出结果

总结

Springboot3版本迭代之后，提供了许多优秀的新属性，如果升级版本之后，有兴趣可以使用