Retrofit实现图文上传至服务器

前言：现在大多数的项目中都涉及图片+文字上传了,下面请详见实现原理：

开发环境:AndroidStudio

1.引入依赖：

  compile 'com.squareup.retrofit2:retrofit:2.1.0'
2.网络权限：
<uses-permission android:name="android.permission.INTERNET" />
3.创建上传对象OkHttpClient ：
PRivate static final OkHttpClient client = new OkHttpClient.Builder()            .addInterceptor(new Interceptor() {                @Override                public Response intercept(Chain chain) throws IOException {                    Request request = chain                            .request()                            .newBuilder()                            .build();                    return chain.proceed(request);                }            })            .readTimeout(10, TimeUnit.SECONDS)//设置读取超时时间            .writeTimeout(10, TimeUnit.SECONDS)//设置写的超时时间            .connectTimeout(15, TimeUnit.SECONDS)//设置连接超时时间            .build();
4.上传图片的公有方法：
    private synchronized final static void uploadImgAndParameter(Map<String, Object> map, String url,                                                                 final UIDataListener listener) {        // mImgUrls为存放图片的url集合        MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);        if (null != map) {            for (Map.Entry<String, Object> entry : map.entrySet()) {                if (entry.getValue() != null) {                    if (entry.getValue() instanceof File) {                        File f = (File) entry.getValue();                        builder.addFormDataPart(entry.getKey(), f.getName(), RequestBody.create(MEDIA_TYPE_PNG, f));                    } else {                        builder.addFormDataPart(entry.getKey(), entry.getValue().toString());                    }                }            }        }        //创建RequestBody        RequestBody body = builder.build();//        MultipartBody requestBody = builder.build();        //构建Request请求        final Request request = new Request.Builder()                .url(url)//地址                .post(body)//添加请求体//                .post(requestBody)//添加请求体                .build();        client.newCall(request).enqueue(new okhttp3.Callback() {            @Override            public void onResponse(Call call, final Response response) throws IOException {                if (response.isSuccessful()) {//判断是否成功                    final String data = response.body().string();//string()仅可调用一次。否则报IllegalStateException: closed异常                    Log.i("file1", "上传照片成功-->" + data);                    onSuccess(listener, data);                    call.cancel();//上传成功取消请求释放内存                }            }            @Override            public void onFailure(Call call, final IOException e) {                Log.i("file2", "上传失败-->" + e.getMessage());                String msg = e.getMessage();                if (msg == null || msg.equals("timeout")) {                    onError(listener, "网络不稳定请求超时!");                } else {                    onError(listener, e.getMessage());                }                call.cancel();//上传失败取消请求释放内存            }        });    }//注意：添加手机图片，别忘了添加SD卡权限
5.全部代码：
public class HttpUtil {    private static final Handler handler = new Handler(Looper.getMainLooper());    private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/*");    private static final OkHttpClient client = new OkHttpClient.Builder()            .addInterceptor(new Interceptor() {                @Override                public Response intercept(Chain chain) throws IOException {                    Request request = chain                            .request()                            .newBuilder()                            .build();                    return chain.proceed(request);                }            })            .readTimeout(10, TimeUnit.SECONDS)//设置读取超时时间            .writeTimeout(10, TimeUnit.SECONDS)//设置写的超时时间            .connectTimeout(15, TimeUnit.SECONDS)//设置连接超时时间            .build();    /**     * 实例--》添加商品     */    public static void addCoupon( int shopperId,String shopperName,                                 File file, final UIDataListener listener) {        String url = "shopappajx/shopAppCouponAction_saveCoupon.htm";        Map<String, Object> map = new HashMap<>();        map.put("shopperId", shopperId);        map.put("shopperName", shopperName);        map.put("couponImage", file);//商品图片        uploadImgAndParameter(map, url, listener);    }    //上传图片共有方法    private synchronized final static void uploadImgAndParameter(Map<String, Object> map, String url,                                                                 final UIDataListener listener) {        // mImgUrls为存放图片的url集合        MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);        if (null != map) {            for (Map.Entry<String, Object> entry : map.entrySet()) {                if (entry.getValue() != null) {                    if (entry.getValue() instanceof File) {                        File f = (File) entry.getValue();                        builder.addFormDataPart(entry.getKey(), f.getName(), RequestBody.create(MEDIA_TYPE_PNG, f));                    } else {                        builder.addFormDataPart(entry.getKey(), entry.getValue().toString());                    }                }            }        }        //创建RequestBody        RequestBody body = builder.build();//        MultipartBody requestBody = builder.build();        //构建Request请求        final Request request = new Request.Builder()                .url(url)//地址                .post(body)//添加请求体//                .post(requestBody)//添加请求体                .build();        client.newCall(request).enqueue(new okhttp3.Callback() {            @Override            public void onResponse(Call call, final Response response) throws IOException {                if (response.isSuccessful()) {//判断是否成功                    final String data = response.body().string();//string()仅可调用一次。否则报IllegalStateException: closed异常                    Log.i("file1", "上传照片成功-->" + data);                    onSuccess(listener, data);                    call.cancel();//上传成功取消请求释放内存                }            }            @Override            public void onFailure(Call call, final IOException e) {                Log.i("file2", "上传失败-->" + e.getMessage());                String msg = e.getMessage();                if (msg == null || msg.equals("timeout")) {                    onError(listener, "网络不稳定请求超时!");                } else {                    onError(listener, e.getMessage());                }                call.cancel();//上传失败取消请求释放内存            }        });    }    private final static void onSuccess(final UIDataListener listener, final String data) {        handler.post(new Runnable() {            public void run() {                // 需要在主线程的操作。                listener.onSuccess(data);            }        });    }    private final static void onError(final UIDataListener listener, final String msg) {        if (null != listener) {            handler.post(new Runnable() {                public void run() {                    // 需要在主线程的操作。                    listener.onFailure(msg);                }            });        }    }    public interface UIDataListener {     //网络请求成功        void onSuccess(String data);      //网络请求失败        void onFailure(String errorMassage);    }}