Java：retrofit2发送http网络请求

文档：https://square.github.io/retrofit/

Github: https://github.com/square/retrofit

使用Python Flask提供简易的api测试服务

# -*- coding: utf-8 -*- import random from flask import Flask, Request, jsonify app = Flask(__name__) @app.route("/get") def get(): """通过get方式传递查询参数""" name = request.args.get("name") age = random.randint(10, 30) data = { "name": name, "age": age, } return jsonify(data) @app.route("/post", methods=['POST']) def post(): """通过post方式提交json数据""" name = request.json.get("name") age = random.randint(10, 30) data = { "name": name, "age": age, } return jsonify(data) if __name__ == '__main__': app.run(debug=True)

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依赖

com.squareup.retrofit2 retrofit 2.9.0 com.squareup.retrofit2 converter-gson 2.0.0-beta3 junit junit 4.13 test

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返回的实体对象

package com.demo.http; public class Person { private String name; private Integer age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "Person{" + "name='" + name + '\'' + ", age=" + age + '}'; } }

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请求接口

package com.demo.http; import okhttp3.RequestBody; import retrofit2.Call; import retrofit2.http.Body; import retrofit2.http.GET; import retrofit2.http.POST; import retrofit2.http.Query; public interface ApiService { @GET("/get") Call getPerson(@Query("name") String name); @POST("/post") Call postPerson(@Body RequestBody body); }

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测试代码

package com.demo.http; import com.google.gson.Gson; import okhttp3.MediaType; import okhttp3.RequestBody; import org.junit.BeforeClass; import org.junit.Test; import retrofit2.Call; import retrofit2.GsonConverterFactory; import retrofit2.Response; import retrofit2.Retrofit; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class RequestTest { // 请求地址 private static final String BASE_URL = "http://127.0.0.1:5000/"; // json private static final MediaType JSON = MediaType.get("application/json; charset=utf-8"); private static Retrofit retrofit; @BeforeClass public static void setUp() { retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) // 类型转换 Could not locate ResponseBody converter for class .addConverterFactory(GsonConverterFactory.create()) .build(); } /** * GET 测试 * * @throws IOException */ @Test public void testGet() throws IOException { ApiService request = retrofit.create(ApiService.class); Call call = request.getPerson("Tom"); // Person person = call.execute(); // 同步请求 Response response = call.execute(); Person person = response.body(); System.out.println(person); // Person{name='Tom', age=10} } /** * POST json 测试 * * @throws IOException */ @Test public void testPost() throws IOException { ApiService request = retrofit.create(ApiService.class); // body参数 Map map = new HashMap<>(); map.put("name", "Jack"); Gson gson = new Gson(); String body = gson.toJson(map); System.out.println(body); RequestBody requestBody = RequestBody.create(body, JSON); Call call = request.postPerson(requestBody); // 同步执行 Response response = call.execute(); Person person = response.body(); System.out.println(person); // Person{name='Tom', age=24} } }

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参考

这是一份很详细的 Retrofit 2.0 使用教程（含实例讲解）

HTTP Java 网络

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