前言：現在大多數的項目中都涉及圖片+文字上傳了,下面請詳見實現原理：
開發環境:AndroidStudio
1.引入依賴：
compile 'com.squareup.retrofit2:retrofit:2.1.0'
2.網絡權限：
<uses-permission android:name="android.permission.INTERNET" />
3.創建上傳對象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)//設置讀取超時時間 .writeTimeout(10, TimeUnit.SECONDS)//設置寫的超時時間 .connectTimeout(15, TimeUnit.SECONDS)//設置連接超時時間 .build();4.上傳圖片的公有方法：
private synchronized final static void uploadImgAndParameter(Map<String, Object> map, String url, final UIDataListener listener) { // mImgUrls為存放圖片的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()); } } } } //創建RequestBody RequestBody body = builder.build();// MultipartBody requestBody = builder.build(); //構建Request請求 final Request request = new Request.Builder() .url(url)//地址 .post(body)//添加請求體// .post(requestBody)//添加請求體 .build(); client.newCall(request).enqueue(new okhttp3.Callback() { @Override public void onResponse(Call call, final Response response) throws IOException { if (response.isSuccessful()) {//判斷是否成功 final String data = response.body().string();//string()僅可調用一次。否則報IllegalStateException: closed異常 Log.i("file1", "上傳照片成功-->" + data); onSuccess(listener, data); call.cancel();//上傳成功取消請求釋放內存 } } @Override public void onFailure(Call call, final IOException e) { Log.i("file2", "上傳失敗-->" + e.getMessage()); String msg = e.getMessage(); if (msg == null || msg.equals("timeout")) { onError(listener, "網絡不穩定請求超時!"); } else { onError(listener, e.getMessage()); } call.cancel();//上傳失敗取消請求釋放內存 } }); }//注意：添加手機圖片，別忘了添加SD卡權限
5.全部代碼：
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)//設置讀取超時時間 .writeTimeout(10, TimeUnit.SECONDS)//設置寫的超時時間 .connectTimeout(15, TimeUnit.SECONDS)//設置連接超時時間 .build(); /** * 實例--》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);//商品圖片 uploadImgAndParameter(map, url, listener); } //上傳圖片共有方法 private synchronized final static void uploadImgAndParameter(Map<String, Object> map, String url, final UIDataListener listener) { // mImgUrls為存放圖片的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()); } } } } //創建RequestBody RequestBody body = builder.build();// MultipartBody requestBody = builder.build(); //構建Request請求 final Request request = new Request.Builder() .url(url)//地址 .post(body)//添加請求體// .post(requestBody)//添加請求體 .build(); client.newCall(request).enqueue(new okhttp3.Callback() { @Override public void onResponse(Call call, final Response response) throws IOException { if (response.isSuccessful()) {//判斷是否成功 final String data = response.body().string();//string()僅可調用一次。否則報IllegalStateException: closed異常 Log.i("file1", "上傳照片成功-->" + data); onSuccess(listener, data); call.cancel();//上傳成功取消請求釋放內存 } } @Override public void onFailure(Call call, final IOException e) { Log.i("file2", "上傳失敗-->" + e.getMessage()); String msg = e.getMessage(); if (msg == null || msg.equals("timeout")) { onError(listener, "網絡不穩定請求超時!"); } else { onError(listener, e.getMessage()); } call.cancel();//上傳失敗取消請求釋放內存 } }); } private final static void onSuccess(final UIDataListener listener, final String data) { handler.post(new Runnable() { public void run() { // 需要在主線程的操作。 listener.onSuccess(data); } }); } private final static void onError(final UIDataListener listener, final String msg) { if (null != listener) { handler.post(new Runnable() { public void run() { // 需要在主線程的操作。 listener.onFailure(msg); } }); } } public interface UIDataListener { //網絡請求成功 void onSuccess(String data); //網絡請求失敗 void onFailure(String errorMassage); }}以上就是本文的全部內容，希望本文的內容對大家的學習或者工作能帶來一定的幫助，同時也希望多多支持武林網！
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