在網路請求中常用的框架有

這裡介紹一下okhttp的使用

compile 'com.squareup.okhttp:okhttp:2.5.0'

package test.org.util;

import android.text.TextUtils;

import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.message.BasicNameValuePair;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class OkHttpUtil {
    private static final String CHARSET_NAME = "UTF-8";
    public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

    private static final OkHttpClient okHttpClient = new OkHttpClient();

    static {
        okHttpClient.setConnectTimeout(10, TimeUnit.SECONDS);
    }

    /**
     * 同步get
     *
     * @param url
     * @return
     * @throws Exception
     */
    public static String get(String url) throws Exception {
        Request request = new Request.Builder().url(url).build();

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

    /**
     * 同步get請求
     *
     * @param url
     * @param data
     * @return
     * @throws Exception
     */
    public static String get(String url, Map<String, String> data) throws Exception {
        url = getRequestUrl(url, data);
        Request request = new Request.Builder().url(url).build();

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

    /**
     * 非同步get請求
     *
     * @param url
     * @param responseCallback
     * @return
     * @throws Exception
     */
    public static void get(String url, Callback responseCallback) throws Exception {
        Request request = new Request.Builder().url(url).build();

        enqueue(request, responseCallback);
    }

    /**
     * 非同步get
     *
     * @param url
     * @param data
     * @param responseCallback
     * @return
     * @throws Exception
     */
    public static void get(String url, Map<String, String> data, Callback responseCallback) throws Exception {
        url = getRequestUrl(url, data);
        Request request = new Request.Builder().url(url).build();

        enqueue(request, responseCallback);
    }

    /**
     * 同步post json資料
     *
     * @param url
     * @param json
     * @return
     * @throws IOException
     */
    public static String post(String url, String json) throws IOException {
        RequestBody body = RequestBody.create(JSON, json);
        Request request = new Request.Builder().url(url).post(body).build();

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

    /**
     * 同步post 鍵值對資料
     *
     * @param url
     * @param data
     * @return
     * @throws IOException
     */
    public static String post(String url, Map<String, String> data) throws IOException {
        FormEncodingBuilder formBuilder = new FormEncodingBuilder();
        for (Map.Entry<String, String> item : data.entrySet()) {
            formBuilder.add(item.getKey(), item.getValue());
        }

        RequestBody body = formBuilder.build();
        Request request = new Request.Builder().url(url).post(body).build();

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

    /**
     * 非同步post json
     *
     * @param url
     * @param json
     * @param responseCallback
     * @throws IOException
     */
    public static void post(String url, String json, Callback responseCallback) throws IOException {
        RequestBody body = RequestBody.create(JSON, json);
        Request request = new Request.Builder().url(url).post(body).build();

        enqueue(request, responseCallback);
    }

    /**
     * 非同步post key-value
     *
     * @param url
     * @param data
     * @param responseCallback
     * @throws IOException
     */
    public static void post(String url, Map<String, String> data, Callback responseCallback) throws IOException {
        FormEncodingBuilder formBuilder = new FormEncodingBuilder();
        for (Map.Entry<String, String> item : data.entrySet()) {
            formBuilder.add(item.getKey(), item.getValue());
        }

        RequestBody body = formBuilder.build();
        Request request = new Request.Builder().url(url).post(body).build();

        enqueue(request, responseCallback);
    }

    /**
     * 同步put
     *
     * @param url
     * @param json
     * @return
     * @throws IOException
     */
    public static String put(String url, String json) throws IOException {
        RequestBody body = RequestBody.create(JSON, json);

        Request request = new Request.Builder().url(url).put(body).build();

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

    /**
     * 同步put key-value
     *
     * @param url
     * @param data
     * @return
     * @throws IOException
     */
    public static String put(String url, Map<String, String> data) throws IOException {
        FormEncodingBuilder formBuilder = new FormEncodingBuilder();
        for (Map.Entry<String, String> item : data.entrySet()) {
            formBuilder.add(item.getKey(), item.getValue());
        }

        RequestBody body = formBuilder.build();
        Request request = new Request.Builder().url(url).put(body).build();

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

    /**
     * 非同步put json
     *
     * @param url
     * @param json
     * @throws IOException
     */
    public static void put(String url, String json, Callback responseCallback) throws IOException {
        RequestBody body = RequestBody.create(JSON, json);

        Request request = new Request.Builder().url(url).put(body).build();
        enqueue(request, responseCallback);
    }

    /**
     * 非同步put key-value
     *
     * @param url
     * @param data
     * @param responseCallback
     * @throws IOException
     */
    public static void put(String url, Map<String, String> data, Callback responseCallback) throws IOException {
        FormEncodingBuilder formBuilder = new FormEncodingBuilder();
        for (Map.Entry<String, String> item : data.entrySet()) {
            formBuilder.add(item.getKey(), item.getValue());
        }

        RequestBody body = formBuilder.build();
        Request request = new Request.Builder().url(url).put(body).build();

        enqueue(request, responseCallback);
    }

    /**
     * 通用同步請求。
     *
     * @param request
     * @return
     * @throws IOException
     */
    public static Response execute(Request request) throws IOException {
        return okHttpClient.newCall(request).execute();
    }

    /**
     * 通用非同步請求
     *
     * @param request
     * @param responseCallback
     */
    public static void enqueue(Request request, Callback responseCallback) {
        okHttpClient.newCall(request).enqueue(responseCallback);
    }

    /**
     * 開啟非同步執行緒訪問網路, 且不在意返回結果（實現空callback）
     *
     * @param request
     */
    public static void enqueue(Request request) {
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onResponse(Response arg0) throws IOException {
                //
            }

            @Override
            public void onFailure(Request arg0, IOException arg1) {
                //
            }
        });
    }

    public static String getStringFromServer(String url) throws IOException {
        Request request = new Request.Builder().url(url).build();
        Response response = execute(request);
        if (response.isSuccessful()) {
            String responseUrl = response.body().string();
            return responseUrl;
        } else {
            throw new IOException("Unexpected code " + response);
        }
    }


    /**
     * 這裡使用了HttpClinet的API。只是為了方便
     *
     * @param params
     * @return
     */
    public static String formatParams(List<BasicNameValuePair> params) {
        return URLEncodedUtils.format(params, CHARSET_NAME);
    }

    /**
     * 為HttpGet 的 url 方便的新增多個name value 引數。
     *
     * @param url
     * @param params
     * @return
     */
    public static String attachHttpGetParams(String url, List<BasicNameValuePair> params) {
        return url + "?" + formatParams(params);
    }

    /**
     * 為HttpGet 的 url 方便的新增1個name value 引數。
     *
     * @param url
     * @param name
     * @param value
     * @return
     */
    public static String attachHttpGetParam(String url, String name, String value) {
        return url + "?" + name + "=" + value;
    }

    /**
     * get方式URL拼接
     *
     * @param url
     * @param map
     * @return
     */
    private static String getRequestUrl(String url, Map<String, String> map) {
        if (map == null || map.size() == 0) {
            return url;
        } else {
            StringBuilder newUrl = new StringBuilder(url);
            if (url.indexOf("?") == -1) {
                newUrl.append("?rd=" + Math.random());
            }

            for (Map.Entry<String, String> item : map.entrySet()) {
                if (false == TextUtils.isEmpty(item.getKey().trim())) {
                    try {
                        newUrl.append("&" + item.getKey().trim() + "=" + URLEncoder.encode(String.valueOf(item.getValue().trim()), "UTF-8"));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }

            return newUrl.toString();
        }
    }
}
 

這個工具類很不錯：

https://github.com/hongyangAndroid/okhttp-utils