Question

我希望用户将pdf上传到服务器并将其下载到其他用户。我想将上传文件的URL保存到数据库，然后拾取该URL以显示其他用户。我正在学习android，所以我没有太多的想法。这是我的代码，我曾尝试使用multipart： -

}

Answer 1

完整的工作示例，针对超过100 Mb的文件进行了测试，将your_package替换为您的包名称。

<强>的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="your_package" >

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

布局activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Browse"
        android:id="@+id/browse"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Upload"
        android:id="@+id/upload"/>
</LinearLayout>

活动主要活动

package your_package;

import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    Uri path;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button browse = (Button) findViewById(R.id.browse);
        Button upload = (Button) findViewById(R.id.upload);

        browse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent();
                intent.setType("application/pdf");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Select PDF"), 1);
            }
        });
        upload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                (new Upload(MainActivity.this, path)).execute();

            }
        });
    }

    public void onActivityResult(int requestCode, int resultCode, Intent result) {
        if (resultCode == RESULT_OK) {
            if (requestCode == 1) {
                path = result.getData();
            }
        }
    }
}

class Upload extends AsyncTask<Void, Void, Void> {
    private ProgressDialog pd;
    private Context c;
    private Uri path;

    public Upload(Context c, Uri path) {
        this.c = c;
        this.path = path;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pd = ProgressDialog.show(c, "Uploading", "Please Wait");
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        pd.dismiss();
    }

    @Override
    protected Void doInBackground(Void... params) {
        String url_path = "http://192.168.43.50/projectpri/upload.php";
        HttpURLConnection conn = null;

        int maxBufferSize = 1024;
        try {
            URL url = new URL(url_path);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setChunkedStreamingMode(1024);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Content-Type", "multipart/form-data");

            OutputStream outputStream = conn.getOutputStream();
            InputStream inputStream = c.getContentResolver().openInputStream(path);

            int bytesAvailable = inputStream.available();
            int bufferSize = Math.min(bytesAvailable, maxBufferSize);
            byte[] buffer = new byte[bufferSize];

            int bytesRead;
            while ((bytesRead = inputStream.read(buffer, 0, bufferSize)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            outputStream.flush();
            inputStream.close();

            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                Log.i("result", line);
            }
            reader.close();
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            if (conn != null) {
                conn.disconnect();
            }
        }
        return null;
    }
}

服务器端PHP

$file_name = date("U").".pdf"; //name of your file
$server_path = "/path/to/file/folder/"; //server path to folder
$web_path = "http://192.168.43.50/projectpri/file/"; //web path to folder

$file = $server_path.$file_name;
file_put_contents($file,"");

$fp = fopen("php://input", 'r');
while ($buffer =  fread($fp, 8192)) {
    file_put_contents($file,$buffer,FILE_APPEND | LOCK_EX);
}

echo $web_path.$file_name;

Answer 2

首先，您不应该使用HttpClient，MultipartEntitiy，因为它们已弃用而根本不使用不推荐 http://developer.android.com/。

我也使用过这些课程，但现在是时候升级到市场并使用当前的Android M.进行更新。
我也知道互联网上的最大教程与HttpClient等相关，这对于 HttpUrlConnection 的当前时间没用。

为方便起见，请查看以下链接：

常识：

Android deprecated apache module (HttpClient, HttpResponse, etc.)

http://developer.android.com/about/versions/marshmallow/android-6.0-changes.html

适用于发布到服务器的有用链接：

http://www.codejava.net/java-se/networking/upload-files-by-sending-multipart-request-programmatically

Upload multiple image file using HttpURLConnection

http://www.codejava.net/java-se/networking/upload-files-by-sending-multipart-request-programmatically

要将数据发布到服务器，您也可以轻松使用库像凌空一样，改造。等

您必须对其进行一些实验，以便在各种Android版本和有效方式下安全地保护您的代码。

谢谢

将pdf文件上传到服务器并获取其URL

2 个答案: