android手機開發之檔案上傳功能實現

來源:互聯網
上載者:User

檔案上傳在B/S應用中是一種十分常見的功能,那麼在Android平台下是否可以實現像B/S那樣的檔案上傳功能呢?答案是肯定的。下面是一個類比網站程式上傳檔案的例子。這裡唯寫出了Android部分的代碼,伺服器的代碼沒有貼出來,有需要完整上傳功能代碼的朋友可以跟我聯絡喲…

 

首先建立一個Android工程,建立主啟動Activity:

 

 代碼如下 複製代碼

 

MainActivity.java:

 

package com.xzq.upload;

 

import java.io.DataOutputStream;

import java.io.FileInputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

 

public class MainActivity extends Activity

{

 

  private String newName = "htys.mp3";

  //要上傳的本地檔案路徑

  private String uploadFile = "/data/data/com.xzq/htys.mp3";

  //上傳到伺服器的指定位置

  private String actionUrl = "jsp">http://192.168.100.100:8080/upload/upload.jsp";

  private TextView mTextView1;

  private TextView mTextView2;

  private Button mButton1;

 

  @Override

  public void onCreate(Bundle savedInstanceState)

  {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    mTextView1 = (TextView) findViewById(R.id.myText2);

    mTextView1.setText("FilePath:/n" + uploadFile);

    mTextView2 = (TextView) findViewById(R.id.myText3);

    mTextView2.setText("UploadPath:/n" + actionUrl);

    /* 設定mButton的onClick事件處理 */

    mButton1 = (Button) findViewById(R.id.myButton);

    mButton1.setOnClickListener(new View.OnClickListener()

    {

      public void onClick(View v)

      {

        uploadFile();

      }

    });

  }

 

  private void uploadFile()

  {

    String end = "/r/n";

    String Hyphens = "--";

    String boundary = "*****";

    try

    {

      URL url = new URL(actionUrl);

      HttpURLConnection con = (HttpURLConnection) url.openConnection();

      /* 允許Input、Output,不使用Cache */

      con.setDoInput(true);

      con.setDoOutput(true);

      con.setUseCaches(false);

      /* 設定傳送的method=POST */

      con.setRequestMethod("POST");

      /* setRequestProperty */

      con.setRequestProperty("Connection", "Keep-Alive");

      con.setRequestProperty("Charset", "UTF-8");

      con.setRequestProperty("Content-Type",

          "multipart/form-data;boundary=" + boundary);

      /* 設定DataOutputStream */

      DataOutputStream ds = new DataOutputStream(con.getOutputStream());

      ds.writeBytes(Hyphens + boundary + end);

      ds.writeBytes("Content-Disposition: form-data; "

          + "name=/"file1/";filename=/"" + newName + "/"" + end);

      ds.writeBytes(end);

      /* 取得檔案的FileInputStream */

      FileInputStream fStream = new FileInputStream(uploadFile);

      /* 設定每次寫入1024bytes */

      int bufferSize = 1024;

      byte[] buffer = new byte[bufferSize];

      int length = -1;

      /* 從檔案讀取資料到緩衝區 */

      while ((length = fStream.read(buffer)) != -1)

      {

        /* 將資料寫入DataOutputStream中 */

        ds.write(buffer, 0, length);

      }

      ds.writeBytes(end);

      ds.writeBytes(Hyphens + boundary + Hyphens + end);

      fStream.close();

      ds.flush();

      /* 取得Response內容 */

      InputStream is = con.getInputStream();

      int ch;

      StringBuffer b = new StringBuffer();

      while ((ch = is.read()) != -1)

      {

        b.append((char) ch);

      }

      System.out.println("上傳成功");

      Toast.makeText(MainActivity.this, "上傳成功", Toast.LENGTH_LONG)

          .show();

      ds.close();

    } catch (Exception e)

    {

      System.out.println("上傳失敗" + e.getMessage());

      Toast.makeText(MainActivity.this, "上傳失敗" + e.getMessage(),

          Toast.LENGTH_LONG).show();

    }

  }

}

 

最後別忘了在AndroidManifest.xml中設定訪問Internet的許可權:

 代碼如下 複製代碼

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

 

在Android中上傳檔案的原理跟在web中上傳檔案基本是一致的,代碼比較簡單,就不多做解釋了

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.