app端实现上传pdf完整代码

这里提供一个使用HTTP协议上传pdf文件的示例代码，仅供参考：

import android.os.AsyncTask;
import android.util.Log;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class UploadPdfTask extends AsyncTask<String, Integer, String> {
    private static final String TAG = "UploadPdfTask";
    private String mFilePath;
    private String mServerUrl;
    private int mResponseCode;

    public UploadPdfTask(String filePath, String serverUrl) {
        mFilePath = filePath;
        mServerUrl = serverUrl;
    }

    @Override
    protected String doInBackground(String... params) {
        String result = null;
        HttpURLConnection connection = null;
        DataOutputStream outputStream = null;
        FileInputStream inputStream = null;
        String boundary = "===" + System.currentTimeMillis() + "===";

        try {
            URL url = new URL(mServerUrl);
            connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.setDoOutput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

            outputStream = new DataOutputStream(connection.getOutputStream());
            File file = new File(mFilePath);
            inputStream = new FileInputStream(file);
            byte[] buffer = new byte[1024 * 1024];
            int length;
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, length);
            }
            outputStream.flush();

            mResponseCode = connection.getResponseCode();
            if (mResponseCode == 200) {
                result = "上传成功";
            } else {
                result = "上传失败";
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (outputStream != null) {
                    outputStream.close();
                }
                if (connection != null) {
                    connection.disconnect();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        Log.d(TAG, "onPostExecute: " + s);
        if (mResponseCode == 200) {
            // 上传成功
        } else {
            // 上传失败
        }
    }
}

使用方法：

String filePath = "/sdcard/test.pdf";
String serverUrl = "http://example.com/upload";
new UploadPdfTask(filePath, serverUrl).execute();

需要注意的是，上面代码中的`serverUrl`需要替换成你自己的服务器地址，同时还需要根据你的实际情况修改一些其他参数。