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); }}

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