// 简单的get请求
@Test
public void testGet() {
    String url = "https://zbang.online/wx/list";
    try {
        okhttp3.Response res = HttpWrapper.of(url).get();
        if (res.isSuccessful()) {
            String ans = res.body().string();
            System.out.println("ans : " + ans);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
    
@Test
public void testUpload() {
    String url = "https://zbang.online/wx/qrcode/encode";

    String path = "/Users/yihui/Desktop/img/test.jpg";
    File file = new File(path);

    try {
        Response res = HttpWrapper.of(url)
                .file("image", file.getName(), "image/jpeg", file)
                .addParam("content", "http://www.baidu.com")
                .addParam("size", "400")
                .upload();
        if (res.isSuccessful()) {
            String str = res.body().string();
            System.out.println("ans: " + str);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public class HttpWrapper {
    private static OkHttpClient client = new OkHttpClient();

    private static final String DEFAULT_USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36";

    public static Builder of(String url) {
        return new Builder(url);
    }


    public static class Builder {

        private String url;

        private Map<String, String> params;

        private List<MultipartBody.Part> uploadParts;

        Request.Builder reqBuilder;

        Builder(String url) {
            this.url = url;
            params = new HashMap<>();
            uploadParts = new ArrayList<>();

            reqBuilder = new Request.Builder();


            // 默认添加上user-agent
            addHeader("User-Agent", DEFAULT_USER_AGENT);
        }


        // 添加参数
        public Builder addParam(String key, String value) {
            params.put(key, value);
            return this;
        }


        // 添加头
        public Builder addHeader(String key, String value) {
            reqBuilder.addHeader(key, value);
            return this;
        }


        public Builder file(String key, String fileName, String fileMime, byte[] bytes) {
            MultipartBody.Part part = MultipartBody.Part.createFormData(
                    key,
                    fileName,
                    RequestBody.create(MediaType.parse(fileMime), bytes));
            uploadParts.add(part);
            return this;
        }

        public Builder file(String key, String fileName, String fileMime, File file) {
            MultipartBody.Part part = MultipartBody.Part.createFormData(
                    key,
                    fileName,
                    RequestBody.create(MediaType.parse(fileMime), file));
            uploadParts.add(part);
            return this;
        }

        public Builder file(String key, String fileName, String fileMime, InputStream stream) throws IOException {
            int size = stream.available();
            byte[] bytes = new byte[size];
            stream.read(bytes);
            return file(key, fileName, fileMime, bytes);
        }


        /**
         * 发送get请求
         *
         * @return
         * @throws IOException
         */
        public Response get() throws IOException {
            StringBuilder urlBuilder = new StringBuilder(url);
            if (!params.isEmpty()) {
                urlBuilder.append("?").append(Joiner.on('&').withKeyValueSeparator('=').join(params));
            }

            return client.newCall(reqBuilder.url(urlBuilder.toString()).build()).execute();
        }


        /**
         * post表单数据
         *
         * @return
         */
        public Response post() throws IOException {
            // 创建表单
            FormBody.Builder formBodyBuilder = new FormBody.Builder();
            if (!params.isEmpty()) {
                params.forEach(formBodyBuilder::add);
            }

            return client.newCall(reqBuilder.url(url)
                    .post(formBodyBuilder.build())
                    .build())
                    .execute();
        }


        /**
         * 文件上传
         *
         * @return
         * @throws IOException
         */
        public Response upload() throws IOException {
            MultipartBody.Builder bodyBuilder = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM);
            uploadParts.forEach(bodyBuilder::addPart);

            // 添加参数
            params.forEach(bodyBuilder::addFormDataPart);

            return client.newCall(reqBuilder.url(url)
                    .post(bodyBuilder.build())
                    .build())
                    .execute();
        }
    }
}

@Test
public void testPost() {
    String url = "https://zbang.online/wx/md2img";

    String content = "h1 header\n" +
            "============\n" +
            "\n" +
            "Paragraphs are separated by a blank line.\n" +
            "\n" +
            "2nd paragraph. *Italic*, **bold**, and `monospace`. Itemized lists\n" +
            "look like:\n" +
            "\n" +
            "  * this one\n" +
            "  * that one\n" +
            "  * the other one";
    String token = "0xdahdljk3u8eqhrjqwer90e";
    String noborder = "true";


    try {
        Response res = HttpWrapper.of(url)
                .addParam("content", content)
                .addParam("token", token)
                .addParam("noborder", noborder)
                .addParam("type", "stream")
                .post();
        if (res.isSuccessful()) {
            BufferedImage bf = ImageIO.read(res.body().byteStream());
            System.out.println("over");
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}