OKH

一、定义OkHttpUtil工具类
其实就是一个普通的java类,其中有一些全局变量。

public class OkHttpUtil {
private static Gson gson = new Gson();
private static final String MEDIA_TYPE = “application/json; charset=utf-8”;
private static final String METHOD_GET = “GET”;
private static final String METHOD_POST = “POST”;
private static final String METHOD_PUT = “PUT”;
private static final String METHOD_DELETE = “DELETE”;
private static OkHttpClient okHttpClient;

/**
 * 私有化构造方法
 * 使用单利模式
 */
private OkHttpUtil() {}

二、定义OkhttpUtil的init方法
这个init（）方法是让我们在项目的初始化时候调用的，作用是实利化OkHttpClient对象，传入公共的请求头参数。

public static void init(Map headers) {
OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.readTimeout(3000, TimeUnit.MILLISECONDS);
builder.writeTimeout(3000, TimeUnit.MILLISECONDS);
builder.connectTimeout(3000, TimeUnit.MILLISECONDS);
builder.addInterceptor(new OKHeaderInterceptor(headers));//添加请求头，此行代码可以不添加
builder.addInterceptor(new OkLogInterceptor());//添加log日志，此行代码可以不添加
okHttpClient = builder.build();
}
三、封装创建request对象的方法
/**
* 创建request对象
*
* @param url
* @param method
* @param baseRequest 项目中自己的的baseRequest对象
* @return
*/
private static Request createRequest(String url, String method, BaseRequest baseRequest) {
RequestBody requestBody = null;
if (baseRequest != null) {
String bodyJson = gson.toJson(baseRequest);
MediaType JSON = MediaType.parse(MEDIA_TYPE);
requestBody = RequestBody.create(JSON, bodyJson);
}

    Request.Builder builder = new Request.Builder().url(url);

    Request request = null;

    switch (method) {
        case METHOD_GET:
            request = builder.build();
            break;
        case METHOD_POST:
            request = builder.post(requestBody).build();
            break;
        case METHOD_PUT:
            if (requestBody != null) {
                request = builder.put(requestBody).build();
            }
            break;
        case METHOD_DELETE:
            if (requestBody != null) {
                request = builder.delete(requestBody).build();
            } else {
                request = builder.delete().build();
            }
            break;
    }

    return request;
}

四、封装常见的get和post方法

/**
 * 异步post方法
 *
 * @param url
 * @param baseRequest
 * @param callback
 */
public static void enqueuePost(String url, BaseRequest baseRequest, Callback callback) {

    Request request = createRequest(url, METHOD_POST, baseRequest);
    Call call = okHttpClient.newCall(request);
    call.enqueue(callback);

}


/**
 * 异步get方法
 *
 * @param url
 * @param callback
 */
public static  void enqueueGet(String url, Callback callback) {
    Request request = createRequest(url, METHOD_GET, null);
    Call call = okHttpClient.newCall(request);
    call.enqueue(callback);

}


/**
 * 同步post方法
 * 注意此方法不能在主线程中调用
 *
 * @param url
 */
public  static Response executePost(String url, BaseRequest baseRequest) throws IOException {
    Request request = createRequest(url, METHOD_POST, baseRequest);
    Call call = okHttpClient.newCall(request);
    Response response = call.execute();
    return response;
}

/**
 * 同步get方法
 * 注意此方法不能在主线程中调用
 *
 * @param url
 */
public  static Response executeGet(String url) throws IOException {
    Request request = createRequest(url, METHOD_GET, null);
    Call call = okHttpClient.newCall(request);
    Response response = call.execute();
    return response;
}

五、使用方式
首先要在项目的application中调用init方法
首先要在项目的application中调用init方法
首先要在项目的application中调用init方法

    String url = "http://www.baidu.com";
    OkHttpUtil.enqueueGet(url, new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {

            //注意此方法返回在子线程中

        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            //注意此方法返回在子线程中
            //获取http 响应码
            int code = response.code();

            //获取服务器返回的json数据
            ResponseBody body = response.body();
            String jsonData = body.string();

            //获取本次请求的请求参数
            //request中有一切请求参数，例如本次请求的url
            Request request = response.request();
            HttpUrl requestUrl = request.url();

        }
    });