android - 如何在 Android 中使用 Multipart？

Question

我想一次上传多张图片。所以我找到了“MultipartEntityBuilder”，但它运行不正常。

这是我的来源...

public void executeMultipartPost() throws Exception {
    try {

        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setCharset(Charset.forName("UTF-8"));
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);  
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
        byteArray = byteArrayOutputStream.toByteArray();


        builder.addTextBody("file1", byteArray.toString());
        builder.addTextBody("file2", byteArray2.toString());

        // send
        InputStream inputStream = null;
        HttpClient httpClient = AndroidHttpClient.newInstance("Android");
        HttpPost httpPost = new HttpPost(UPLOAD_URL);
        httpPost.setEntity(builder.build());
        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        inputStream = httpEntity.getContent();

        // response
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
        StringBuilder stringBuilder = new StringBuilder();
        String line = null;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line + "\n");
        }
        inputStream.close();

        // result
        String result = stringBuilder.toString();

    } catch (Exception e) {
        e.printStackTrace();
    }
}

调试时，'httpPost.setEntity(builder.build())' 这一行是错误的。

并且没有“Caused by~”，但是 Process: NoSuchFiledError in logcat...

但我想我将图像制作成位图然后将其发送到 FTP。怎么了..？谢谢。

Answer 1

您的代码可以摆脱已弃用的 MultipartEntity 代码并使用 MultipartEntityBuilder。但是这里涉及的具体问题是核心Android库与新添加的库冲突。现在也有可用的 Maven 存储库。您可以尝试将以下代码写入以下文件:

build.grade (Module:app)
compile('org.apache.httpcomponents:httpmime:4.3.6') {
    exclude module: 'httpclient'
}

compile 'org.apache.httpcomponents:httpclient-android:4.3.5'

Getting NoSuchFieldError INSTANCE org/apache/http/message/BasicHeaderValueParser