Java：OkHttp基本使用

文档：https://square.github.io/okhttp/

依赖

    com.squareup.okhttp3
    okhttp
    4.8.1



    com.google.code.gson
    gson
    2.8.6



    junit
    junit
    4.13
    test

代码示例

package com.demo;

import com.google.gson.Gson;
import okhttp3.*;
import org.junit.Test;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Demo {
    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

    /**
     * 发送GET请求
     */
    @Test
    public void getRequest() throws IOException {
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("http://httpbin.org/get")
                .build();

        Response response = client.newCall(request).execute();

        if (response.isSuccessful()) {
            System.out.println(response.body().string());
        }

    }

    /**
     * POST请求
     */
    @Test
    public void postRequest() throws IOException {
        OkHttpClient client = new OkHttpClient();

        // 提交FormData
        FormBody.Builder form = new FormBody.Builder();
        form.add("name", "Tom");
        form.add("age", "23");

        Request request = new Request.Builder()
                .url("http://httpbin.org/post")
                .post(form.build())
                .build();

        Response response = client.newCall(request).execute();
        System.out.println(response.body().string());

    }

    /**
     * 提交Json
     */
    @Test
    public void postJsonRequest() throws IOException {
        OkHttpClient client = new OkHttpClient();

        Map map = new HashMap();
        map.put("name", "Tom");
        map.put("age", 23);

        Gson gson = new Gson();
        String data = gson.toJson(map);

        RequestBody requestBody = RequestBody.create(data, JSON);

        Request request = new Request.Builder()
                .url("http://httpbin.org/post")
                .post(requestBody)
                .build();

        Response response = client.newCall(request).execute();
        System.out.println(response.body().string());

    }
}