使用 AsyncTask 将图片或视频上传到服务器

Question

大家好，我是 android 应用程序开发的新手，我正在尝试使用 AsyncTask 将文件上传到服务器，但是当我单击上传按钮时应用程序崩溃了，请帮忙解决这个问题。（抱歉如果有任何语言错误）。

UploadFileToServer class

/**
 * Uploading the file to server
 * */
private class UploadFileToServer extends AsyncTask<Void, Integer, String> {
    @Override
    protected void onPreExecute() {
        progressBar.setVisibility(View.VISIBLE);
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(Void... params) {
        return uploadFile();
    }

    @SuppressWarnings("deprecation")
    private String uploadFile() {
        String responseString;

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(Config.FILE_UPLOAD_URL);

       try {
            AndroidMultiPartEntity entity = new AndroidMultiPartEntity(


                    new AndroidMultiPartEntity.ProgressListener() {

                        @Override
                        public void transferred(long num) {
                            publishProgress((int) ((num / (float) totalSize) * 100));
                        }
                    });
            File sourceFile = new File(filePath);

            // Adding file data to http body
            entity.addPart("image",new FileBody(sourceFile));//new FileBody(sourceFile)

            // Extra parameters pass to server

            totalSize = entity.getContentLength();
            httppost.setEntity(entity);

            // Making server call
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity r_entity = response.getEntity();

            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                // Server response
                responseString = EntityUtils.toString(r_entity);
            } else {
                responseString = "Error occurred! Http Status Code: "
                        + statusCode;
            }

        } catch (ClientProtocolException e) {
            responseString = e.toString();
        } catch (IOException e) {
            responseString = e.toString();
        }

        return responseString;

    }

logcat 错误：

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
#1. E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
#2.Caused by: java.lang.NoClassDefFoundError: org.apache.http.entity.ContentType
E/AndroidRuntime:     at org.apache.http.entity.mime.content.FileBody.<init>(FileBody.java:89)

完整错误window如下：

10-18 20:51:23.109 14829-15007/? E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at android.os.AsyncTask.done(AsyncTask.java:299)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:230)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:856)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:  Caused by: java.lang.NoClassDefFoundError: org.apache.http.entity.ContentType
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at org.apache.http.entity.mime.content.FileBody.<init>(FileBody.java:89)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at com.appnings.cameratrial.UploadActivity$UploadFileToServer.uploadFile(UploadActivity.java:166)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at com.appnings.cameratrial.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:139)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at com.appnings.cameratrial.UploadActivity$UploadFileToServer.doInBackground(UploadActivity.java:114)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at android.os.AsyncTask.call(AsyncTask.java:287)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:230) 
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 
10-18 20:51:23.109 14829-15007/? E/AndroidRuntime:     at java.lang.Thread.run(Thread.java:856) 
10-18 20:51:23.440 569-649/? E/android.os.Debug: !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error

Answer 1

鉴于您尚未发布错误日志（来自 logcat），很难猜测。

您可能错过的常见事物：

<uses-permission android:name="android.permission.INTERNET" />

在 Manifest.xml 中的应用程序标记之外

Answer 2

尝试导入不同的 Apache lib 文件，一些类在一些 lib 文件中丢失，最终在几次导入后它起作用了。谢谢你们。快乐的编码。

Answer 3

我解决了同样的问题

1.Use添加jar的正确方法

Right click your lib folder and choice "add library", and input to project.

在settings.gradle中添加。

packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
}

编译环境：
- Android Studio 1.4
- 目标sdk:21
- jars:httpclient-4.3.6.jar,httpcore-4.3.3.jar,httpmime-4.3.6.jar

使用 AsyncTask 将图片或视频上传到服务器

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