android studio環(huán)境配置

在Module的build.gradle文件中增加依賴包：

dependencies {
    ···
    compile 'com.squareup.okhttp3:okhttp:3.4.1'
}

基本使用

主要有發(fā)Get和Post請(qǐng)求兩種

Get請(qǐng)求

新建工程恋腕。先看代碼

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
    Response response;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(
                new Runnable() {
                    @Override
                    public void run() {
                        try {
                            OkHttpClient client = new OkHttpClient();
                            Request request = new Request.Builder().url("https://raw.github.com/square/okhttp/master/README.md").build();
                            response = client.newCall(request).execute();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
        ).start();
        try {
            Log.v("mylog", response.body().string());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

結(jié)果如下：

Paste_Image.png

其中由于UI線程不能發(fā)網(wǎng)絡(luò)請(qǐng)求，必須開(kāi)新的線程來(lái)進(jìn)行網(wǎng)絡(luò)處理扮休。
其中主要代碼是:

try {
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder().url("https://raw.github.com/square/okhttp/master/README.md").build();
    Response response = client.newCall(request).execute();
    Log.v("mylog", response.body().string());
} catch (Exception e) {
    e.printStackTrace();
}

Response類：

（1）isSuccessful() 方法

public boolean isSuccessful()   //如果返回碼是[200..300),該函數(shù)則返回true。

（2）body() 方法

Response response;
ResponseBody responseBody = response.body()      //返回ResponseBody類
String string = responseBody.string()  

ResponseBody類的string方法谬哀，將response作為string返回逞怨。

Post請(qǐng)求

新建工程捌省。先看代碼

public class MainActivity extends AppCompatActivity {
    Response response;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new Thread(
                new Runnable() {
                    @Override
                    public void run() {
                        try {
                            testPost();
                            try {
                                if(response.isSuccessful()){
                                    Log.v("mylog", response.body().string());
                                    Log.v("mylog", response.header("Set-Cookie"));
                                }else {
                                    Log.v("mylog", "Unexpected code " + response);
                                }
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
        ).start();
    }

    public String GetJson(String PhoneNum, String VerifyCode) {
        JSONObject jsn_login = new JSONObject();
        try{
            jsn_login.put("phoneNo",PhoneNum);
            jsn_login.put("requestOtp",VerifyCode);
        }catch (Exception e){}
        return jsn_login.toString();
    }


    public void testPost() throws IOException {
        OkHttpClient client = new OkHttpClient();
        MediaType JSON = MediaType.parse("application/x-www-form-urlencoded; charset=utf-8");
        RequestBody body = RequestBody.create(JSON, GetJson("11111111111","1234"));
        Request request = new Request.Builder()
                .url("http://localhost:8080/login.do")
                .header("User-Agent", "OkHttp Headers.java")
                .addHeader("Accept", "application/json; q=0.5")
                .post(body)
                .build();
        response = client.newCall(request).execute();
    }
}

（1）設(shè)置請(qǐng)求頭的方法：
1）對(duì)于header(String name, String value)方法，使用name和value設(shè)置一個(gè)頭信息互订，如果請(qǐng)求中已經(jīng)存在響應(yīng)的信息那么直接替換掉吱肌。
2）而addHeader(String name, String value)，如果請(qǐng)求頭中已經(jīng)存在name的name-value仰禽，那么還會(huì)繼續(xù)添加氮墨，請(qǐng)求頭中便會(huì)存在多個(gè)name相同而value不同的“鍵值對(duì)”。

（2）獲取返回頭的方法：
1）response.header("name")方法：如果header中有重復(fù)的吐葵，則返回最后出現(xiàn)的value规揪。如果沒(méi)有值，那么header(name)將返回null折联。

response.header("Set-Cookie")``` 代表獲取cookie粒褒。

2）response.headers()方法，獲取所有的header：返回一個(gè)list诚镰。為了獲取所有的Header奕坟，Headers類支持按index訪問(wèn)。

Headers responseHeaders = response.headers();
for (int i = 0; i < responseHeaders.size(); i++) {
    System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
}

（3）Post請(qǐng)求提交Json數(shù)據(jù)
1）首先新建一個(gè)MediaType
MediaType代表的就是請(qǐng)求包體內(nèi)容的類型清笨。
例如月杉，MediaType.parse("application/json; charset=utf-8");這個(gè)就帶表請(qǐng)求體的類型為JSON格式的。
2）再通過(guò) RequestBody.create(MediaType, JSONDATA);的方法來(lái)創(chuàng)建一個(gè) RequestBody
3）最后通過(guò)Request.Builder().Post(RequestBody)方法來(lái)加入post數(shù)據(jù)抠艾。

public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
OkHttpClient client = new OkHttpClient();
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 = client.newCall(request).execute();
    f (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }
}

（4）Post請(qǐng)求提交鍵值對(duì)
具體方法如下：

OkHttpClient client = new OkHttpClient();
String post(String url, String json) throws IOException {
     RequestBody formBody = new FormEncodingBuilder()
    .add("platform", "android")
    .add("name", "bug")
    .add("subject", "XXXXXXXXXXXXXXX")
    .build();
 
      Request request = new Request.Builder()
      .url(url)
      .post(body)
      .build();
 
      Response response = client.newCall(request).execute();
    if (response.isSuccessful()) {
        return response.body().string();
    } else {
        throw new IOException("Unexpected code " + response);
    }
}

（5）Post方式提交文件

public static final MediaType MEDIA_TYPE_MARKDOWN
  = MediaType.parse("text/x-markdown; charset=utf-8");
 
private final OkHttpClient client = new OkHttpClient();
 
public void run() throws Exception {
    File file = new File("README.md");
 
    Request request = new Request.Builder()
        .url("https://api.github.com/markdown/raw")
        .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file))
        .build();
 
    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
 
    System.out.println(response.body().string());
}

（6）Post方式提交分塊請(qǐng)求
MultipartBuilder可以構(gòu)建復(fù)雜的請(qǐng)求體苛萎，與HTML文件上傳形式兼容。多塊請(qǐng)求體中每塊請(qǐng)求都是一個(gè)請(qǐng)求體检号，可以定義自己的請(qǐng)求頭腌歉。這些請(qǐng)求頭可以用來(lái)描述這塊請(qǐng)求，例如他的Content-Disposition齐苛。如果Content-Length和Content-Type可用的話翘盖，他們會(huì)被自動(dòng)添加到請(qǐng)求頭中。

private static final String IMGUR_CLIENT_ID = "...";
private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
 
private final OkHttpClient client = new OkHttpClient();
 
public void run() throws Exception {
    // Use the imgur image upload API as documented at https://api.imgur.com/endpoints/image
    RequestBody requestBody = new MultipartBuilder()
        .type(MultipartBuilder.FORM)
        .addPart(
            Headers.of("Content-Disposition", "form-data; name=\"title\""),
            RequestBody.create(null, "Square Logo"))
        .addPart(
            Headers.of("Content-Disposition", "form-data; name=\"image\""),
            RequestBody.create(MEDIA_TYPE_PNG, new File("website/static/logo-square.png")))
        .build();
 
    Request request = new Request.Builder()
        .header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
        .url("https://api.imgur.com/3/image")
        .post(requestBody)
        .build();
 
    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
 
    System.out.println(response.body().string());
}

異步Get請(qǐng)求

先看代碼

public class MainActivity extends AppCompatActivity {
    Response response;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        testAsyncGet();
    }

    public void testAsyncGet() {
        OkHttpClient client = new OkHttpClient();
        final Request request = new Request.Builder().url("http://publicobject.com/helloworld.txt").build();
        System.out.println(request);
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                Log.v("mylog", "call = [" + call + "], response = [" + response + "]");
                if (!response.isSuccessful()) {
                    throw new IOException("" + response);
                }

                Headers headers = response.headers();
                for (int i = 0; i < headers.size(); i++) {
                    Log.v("mylog", headers.name(i) + ": " + headers.value(i));
                }

                System.out.println(response.body().string());
            }
        });
    }
}

輸出如下：

Paste_Image.png

https://github.com/square/okhttp/wiki/Recipes
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0106/2275.html
http://blog.csdn.net/biezhihua/article/details/50603624