Java代码OkHttpClient的使用

1.pom依赖

   
            com.squareup.okhttp3
            okhttp
            3.14.9
  

2、代码实现

public class OkHttpClientPost {
    //json传输方式
    private final static MediaType JSON = MediaType.parse("application/json; charset=utf-8");
    //获取okHttpClient对象
    private final static OkHttpClient client = OkHttpClientObject.CLIENT
            .getClientInstance();
    
    
     public static String post(String url, String message) throws IOException {
        //请求体传输json格式的数据
        RequestBody requestBody = RequestBody.create(JSON, message);
        //创建请求
        Request request = new Request.Builder()
                .url(url)
                //.header("User-Agent", "*****")
                //.addHeader("Accept", "*****")
                .post(requestBody)
                .build();

        Call call = client.newCall(request);
        okhttp3.Response response = call.execute();

        if (response.isSuccessful()) {
            return response.body().string();
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }


    
    public static String postMultipartFormData(String url, Map paramMap) throws IOException {


        MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);
        Set keySet = paramMap.keySet();
        //拼接请求参数
        for (String key : keySet) {
            if (key.equals("image_file")) {
                String image_file = paramMap.get("image_file");
                byte[] bytes = new base64Decoder().decodeBuffer(image_file);
                RequestBody fileBody = RequestBody.create(MediaType.parse("image/png"), bytes);
                builder.addFormDataPart("image_file", "image_file", fileBody);
            } else {
                builder.addFormDataPart(key, paramMap.get(key));
            }
        }
        MultipartBody body = builder.build();
        //创建请求
        Request request = new Request.Builder()
                .url(url)
                .method("POST", body)
                .addHeader("Content-Type", "multipart/form-data")
                .build();

        Call call = client.newCall(request);
        okhttp3.Response response = call.execute();
        if (response.isSuccessful()) {
            return response.body().string();
        } else {

             int code = response.code();
             String message = response.message();
             log.error("OCR识别 响应状态码：{}  错误信息：{}",code,message);
            throw new IOException("Unexpected code " + response);
        }
    }







    
    public static String postHeader(String url, String message,String header) throws IOException {
        //请求体传输json格式的数据
        RequestBody requestBody = RequestBody.create(JSON, message);
        //创建请求
        Request request = new Request.Builder()
                .url(url)
                .header("Authorization", header)
                //.addHeader("Accept", "*****")
                .post(requestBody)
                .build();

        Call call = client.newCall(request);
        okhttp3.Response response = call.execute();

        if (response.isSuccessful()) {
            return response.body().string();
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }

}