# Dropwizard 客户端 – Jersey/HTTP 配置和示例 > 原文： [https://howtodoinjava.com/dropwizard/client-configuration-and-examples/](https://howtodoinjava.com/dropwizard/client-configuration-and-examples/) 我们已经使用 dropwizard 构建了 REST API。 现在，让我们构建 REST 客户端，以在整个网络上使用 REST API。 Dropwizard 同时包含 [Apache HttpClient](https://hc.apache.org/httpcomponents-client-ga/quickstart.html) 和 [Jersey 客户端](https://jersey.java.net/nonav/documentation/latest/user-guide.html#client)。 让我们来构建它们。 > 阅读更多： [Dropwizard HelloWorld 应用](//howtodoinjava.com/dropwizard/tutorial-and-hello-world-example/) ## Maven 依赖 Dropwizard 客户端模块被添加为单独的模块。 ```java <properties> <dropwizard.version>1.0.0</dropwizard.version> </properties> <dependency> <groupId>io.dropwizard</groupId> <artifactId>dropwizard-client</artifactId> <version>${dropwizard.version}</version> </dependency> ``` ## Dropwizard REST 客户端配置 Dropwizard 提供易于声明和使用的 REST 客户端配置。 您需要创建`io.dropwizard.client.JerseyClientBuilder`实例并为其提供`io.dropwizard.setup.Environment`参考。 ```java @Override public void run(Configuration c, Environment e) throws Exception { //Here we added REST Resource e.jersey().register(new EmployeeRESTController(e.getValidator())); //Now we added REST Client Resource named RESTClientController final Client client = new JerseyClientBuilder(e).build("DemoRESTClient"); e.jersey().register(new RESTClientController(client)); } ``` 要添加 HTTP 客户端，请使用以下类似的步骤： ```java @Override public void run(Configuration c, Environment e) throws Exception { //Here we added REST Resource e.jersey().register(new EmployeeRESTController(e.getValidator())); //Now we added REST Client Resource named RESTClientController final HttpClient client = new HttpClientBuilder(e).build("DemoRESTClient"); e.jersey().register(new RESTClientController(client)); } ``` `HttpClientConfiguration`的默认配置如下： ```java timeout: 500ms connectionTimeout: 500ms timeToLive: 1 hour cookiesEnabled: false maxConnections: 1024 maxConnectionsPerRoute: 1024 keepAlive: 0s ``` `JerseyClientConfiguration`的默认配置如下： ```java minThreads: 1 maxThreads: 128 gzipEnabled: true gzipEnabledForRequests: true //same as HttpClientConfiguration timeout: 500ms connectionTimeout: 500ms timeToLive: 1 hour cookiesEnabled: false maxConnections: 1024 maxConnectionsPerRoute: 1024 keepAlive: 0s ``` ## Dropwizard REST 客户端资源 现在，当您可以访问 REST 客户端资源`RESTClientController.java`中的`javax.ws.rs.client.Client`或`org.apache.http.client.HttpClient`时，您可以使用库方法来照常调用 HTTP URI。 ```java package com.howtodoinjava.rest.controller; import java.util.ArrayList; import javax.ws.rs.GET; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.client.Client; import javax.ws.rs.client.Invocation; import javax.ws.rs.client.WebTarget; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.Response; import com.howtodoinjava.rest.representations.Employee; @Produces(MediaType.TEXT_PLAIN) @Path("/client/") public class RESTClientController { private Client client; public RESTClientController(Client client) { this.client = client; } @GET @Path("/employees/") public String getEmployees() { //Do not hard code in your application WebTarget webTarget = client.target("http://localhost:8080/employees"); Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_JSON); Response response = invocationBuilder.get(); @SuppressWarnings("rawtypes") ArrayList employees = response.readEntity(ArrayList.class); return employees.toString(); } @GET @Path("/employees/{id}") public String getEmployeeById(@PathParam("id") int id) { //Do not hard code in your application WebTarget webTarget = client.target("http://localhost:8080/employees/"+id); Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_JSON); Response response = invocationBuilder.get(); Employee employee = response.readEntity(Employee.class); return employee.toString(); } } ``` 在上面的类中，我访问了在 [dropwizard HelloWorld 教程](//howtodoinjava.com/dropwizard/tutorial-and-hello-world-example/)中创建的 REST API。 访问 API 之后，我以纯文本形式返回了响应，如下图所示。  DropWizard REST 客户端 我已将客户端资源类的上下文路径设置为`/client/`，以在逻辑上分离客户端端点和服务端点的 URI。 > 阅读更多 ： > > [Jersey RESTful 客户端示例](//howtodoinjava.com/jersey/jersey-restful-client-examples/) > > [Apache HttpClient GET/POST 请求示例](//howtodoinjava.com/apache-commons/jax-rs-restful-client-using-apache-httpclient/) [源码下载](//howtodoinjava.com/wp-content/downloads/DropWizardExample.zip) 将我的问题放在评论部分。 学习愉快！