Android implements file upload function

File uploading is a very common function in B/S applications, so is it possible to implement file uploading functions like B/S on the Android platform? The answer is yes. Below is an example of simulating a website program to upload files. Only the Android part of the code is written here. The server code is not posted. Friends who need to upload the complete function code can contact me...

First create a new Android project, create a new main startup Activity:

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";
  //要上传的本地文件路径
  private String uploadFile = "/data/data/com.xzq/htys.mp3";
  //上传到服务器的指定位置
  private String actionUrl = "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);
    /* 设定mButton的onClick事件处理 */
    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();
      /* 允许Input、Output，不使用Cache */
      con.setDoInput(true);
      con.setDoOutput(true);
      con.setUseCaches(false);
      /* 设定传送的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);
      /* 设定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);
      /* 取得文件的FileInputStream */
      FileInputStream fStream = new FileInputStream(uploadFile);
      /* 设定每次写入1024bytes */
      int bufferSize = 1024;
      byte[] buffer = new byte[bufferSize];
      int length = -1;
      /* 从文件读取数据到缓冲区 */
      while ((length = fStream.read(buffer)) != -1)
      {
        /* 将数据写入DataOutputStream中 */
        ds.write(buffer, 0, length);
      }
      ds.writeBytes(end);
      ds.writeBytes(Hyphens + boundary + Hyphens + end);
      fStream.close();
      ds.flush();
      /* 取得Response内容 */
      InputStream is = con.getInputStream();
      int ch;
      StringBuffer b = new StringBuffer();
      while ((ch = is.read()) != -1)
      {
        b.append((char) ch);
      }
      System.out.println("上传成功");
      Toast.makeText(MainActivity.this, "上传成功", Toast.LENGTH_LONG)
          .show();
      ds.close();
    } catch (Exception e)
    {
      System.out.println("上传失败" + e.getMessage());
      Toast.makeText(MainActivity.this, "上传失败" + e.getMessage(),
          Toast.LENGTH_LONG).show();
    }
  }
}

Finally Don’t forget to set the permission to access the Internet in AndroidManifest.xml:

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