Android Studio 网络编程 OkHttp3 用法

不得不说真是天下文章一大抄，坑真多，费了好大的劲，才成功搞定android 的http请求。

本来想用人家封装好的，发现都有各种错误，okhttp已经更新了，部分函数也变动了，博客没改，git也没改，

想想还是从基础做起，慢慢封装自己的一些公用类吧。

一、准备工作

到官网下载最新版的okhttp.jar

下载地址：http://square.github.io/okhttp/

拷贝到libs文件夹，右键-Add As Library，这时需要稍等10秒钟左右，AS要构建函数库。

添加权限：

<!--连接网络-->    <uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <!--读写文件-->    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

下边就能正式使用了。

二、直接上代码

/**     * 上传文件及参数     */    private void sendMultipart(){        File sdcache = getExternalCacheDir();        int cacheSize = 10 * 1024 * 1024;        //设置超时时间及缓存，下边都应该这样设置的。        OkHttpClient.Builder builder = new OkHttpClient.Builder()                .connectTimeout(15, TimeUnit.SECONDS)                .writeTimeout(20, TimeUnit.SECONDS)                .readTimeout(20, TimeUnit.SECONDS)                .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize));        OkHttpClient mOkHttpClient=builder.build();        RequestBody requestBody = new MultipartBody.Builder()                .setType(MultipartBody.FORM)                .addFormDataPart("title", "wangshu")//设置post的参数                .addFormDataPart("image", "wangshu.jpg",//如何接收图片，还在研究                        RequestBody.create(MEDIA_TYPE_PNG, new File("/sdcard/wangshu.jpg")))                .build();        Request request = new Request.Builder()                .header("Authorization", "Client-ID " + "...")                .url("https://***.php")//请求的url                .post(requestBody)                .build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                Log.i("InfoMSG", response.body().string());            }        });    }    /**     * 异步下载文件     */    private void downAsynFile() {        OkHttpClient mOkHttpClient = new OkHttpClient();        String url = "http://***.jpg";        Request request = new Request.Builder().url(url).build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) {                InputStream inputStream = response.body().byteStream();                FileOutputStream fileOutputStream = null;                try {                    fileOutputStream = new FileOutputStream(new File("/sdcard/123.jpg"));                    byte[] buffer = new byte[2048];                    int len = 0;                    while ((len = inputStream.read(buffer)) != -1) {                        fileOutputStream.write(buffer, 0, len);                    }                    fileOutputStream.flush();                } catch (IOException e) {                    Log.i("InfoMSG", "IOException");                    e.printStackTrace();                }                Log.d("InfoMSG", "文件下载成功");            }        });    }    /**     * 异步上传文件     */    private void postAsynFile() {        OkHttpClient mOkHttpClient=new OkHttpClient();        File file = new File("/sdcard/123.txt");        Request request = new Request.Builder()                .url("https://www.****.php")                .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, file))                .build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                Log.i("InfoMSG",response.body().string());            }        });    }    private void getAsynHttp() {        OkHttpClient mOkHttpClient=new OkHttpClient();        Request.Builder requestBuilder = new Request.Builder().url("http://www.baidu.com");        //可以省略，默认是GET请求        requestBuilder.method("GET",null);        Request request = requestBuilder.build();        Call mcall= mOkHttpClient.newCall(request);        mcall.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (null != response.cacheResponse()) {                    String str = response.cacheResponse().toString();                    Log.i("InfoMSG", "cache---" + str);                } else {                    response.body().string();                    String str = response.networkResponse().toString();                    Log.i("InfoMSG", "network---" + str);                }                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        Toast.makeText(getApplicationContext(), "请求成功", Toast.LENGTH_SHORT).show();                    }                });            }        });    }    /**     * 异步http post数据     */    private void postAsynHttp() {        OkHttpClient mOkHttpClient = new OkHttpClient();        RequestBody formBody = new FormBody.Builder()                .add("tel", "10")                .build();        Request request = new Request.Builder()                .url("http://192.168.1.105/interface/index.php")                .post(formBody)                .build();        Call call = mOkHttpClient.newCall(request);        call.enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                String str = response.body().string();                Log.i("InfoMSG", str);                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        Toast.makeText(getApplicationContext(), "请求成功", Toast.LENGTH_SHORT).show();                    }                });            }        });    }<pre name="code" class="java">/**     * post JSON 对象     */    private void postJSONObj(){        File sdcache = getExternalCacheDir();        int cacheSize = 10 * 1024 * 1024;        //设置超时时间及缓存        OkHttpClient.Builder builder = new OkHttpClient.Builder()                .connectTimeout(15, TimeUnit.SECONDS)                .writeTimeout(20, TimeUnit.SECONDS)                .readTimeout(20, TimeUnit.SECONDS)                .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize));        OkHttpClient mOkHttpClient=builder.build();               RequestBody requestBody1=RequestBody.create(JSON,"\"user\":\"abc\"");        Request request = new Request.Builder()                .url("https://***.php")                .post(requestBody1)                .build();        mOkHttpClient.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                Log.i("InfoMSG", response.body().string());            }        });    }

三、服务器接收

$_REQUEST["tel"]//接收post的参数$GLOBALS["HTTP_RAW_POST_DATA"]//接收json对象

1、上传图片

$act = $_GET["action"];if ($act == "postimg") {$content = file_get_contents("php://input");$imgName = time();$folder = "images";$file_dir = $folder . "/" . $imgName . ".jpg";try {if (!file_exists($folder)) {//判断目录是否存在mkdir($folder);//创建目录}if ($fp = fopen($file_dir, 'w')) {if (fwrite($fp, $content)) {//写入文件fclose($fp);}}} catch(Exception $ex) {echo "".$ex;}echo "图片上传成功";}

其他用法逐步尝试整理。