okhttp学习心得

1.框架介绍

okHttp3 是一个基于Http协议的网络开源框架，是由 square 公司开发。 在以后的项目开发中，不推荐使用commons-httpclient,httpclient,推荐使用okhttp,feigh。
原因：1.square公司，Netflix公司都是技术实力很强大的公司，他们开源了很多非常好用的框架；2.这两个框架使用人数非常多，网络上资料也是非常丰富的。

2.发送post请求示例

public void sendHttpPost() throws Exception {

    OkHttpClient okHttpClient = new OkHttpClient();
    RequestBody requestBody = RequestBody.create(JSON, JsonUtils.toJSON(paramObject));
    //创建一个请求对象
    Request request = new Request.Builder().url(host).
        addHeader("Content-Type", "application/json;charset=UTF-8").
        addHeader("User-Agent", source).
        addHeader("version-type", versionType).
        addHeader("-authtoken", authentication).
        addHeader("-appid", appid).
        addHeader("-version", version).
        addHeader("-version-code", versionCode).
        addHeader("rom-display", romDisplay).
        addHeader("Content-Type", "application/json;charset=UTF-8").
        post(requestBody).build();
    Response response = okHttpClient.newCall(request).execute();
    //判断请求是否成功
    if (response.isSuccessful()) {
        logger.info("响应成功:{}",IOUtils.toString(response.body().byteStream()));
    }else {
        logger.info("响应失败");
    }

}

3.发送get请求示例

private static void sendGet() throws Exception {
    String url = "https://www.baidu.com/";
    OkHttpClient okHttpClient = new OkHttpClient();
    Request request = new Request.Builder().url(url).build();
    Call call = okHttpClient.newCall(request);
    Response response = call.execute();
    System.out.println(response.body().string());
}

4.需要注意的问题

在http头部，传递中文的时候，会出现乱码。比如: addHeader("phone-model","苹果手机)。这时候运行，就会报错。报错原因是:okhttp框架会对头部的键值对，进行强制校验，校验不通过就抛异常。

部分源码如下:

private void checkNameAndValue(String name, String value) {
    if (name == null) throw new NullPointerException("name == null");
    if (name.isEmpty()) throw new IllegalArgumentException("name is empty");
    for (int i = 0, length = name.length(); i < length; i++) {
        char c = name.charAt(i);
        if (c <= '\u0020' || c >= '\u007f') {
            throw new IllegalArgumentException(Util.format(
                    "Unexpected char %#04x at %d in header name: %s", (int) c, i, name));
        }
    }
    if (value == null) throw new NullPointerException("value for name " + name + " == null");
    for (int i = 0, length = value.length(); i < length; i++) {
        char c = value.charAt(i);
        if ((c <= '\u001f' && c != '\t') || c >= '\u007f') {
            throw new IllegalArgumentException(Util.format(
                    "Unexpected char %#04x at %d in %s value: %s", (int) c, i, name, value));
        }
    }
}

解决方案：可以对可能出现的中文值进行统一编码，然后解码，也可以统一放到框架中进行编解码

method.setRequestHeader("phone-model",URLEncoder.encode(phoneModel,"utf-8"));
model =URLDecoder.decode(reqHead.getPhoneModel(), "utf-8");