Android上传文件到Web服务器，PHP接收文件（一）

      Android上传文件到服务器，通常采用构造http协议的方法，模拟网页POST方法传输文件，服务器端可以采用JavaServlet或者PHP来接收要传输的文件。使用JavaServlet来接收文件的方法比较常见，在这里给大家介绍一个简单的服务器端使用PHP语言来接收文件的例子。

服务器端代码比较简单，接收传输过来的文件：

<?php$target_path  = "./upload/";//接收文件目录$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {   echo "The file ".  basename( $_FILES['uploadedfile']['name']). " has been uploaded";}  else{   echo "There was an error uploading the file, please try again!" . $_FILES['uploadedfile']['error'];}?>

手机客户端代码：

package com.figo.uploadfile;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.FileInputStream;import java.io.InputStream;import java.io.InputStreamReader;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 UploadfileActivity extends Activity{  // 要上传的文件路径，理论上可以传输任何文件，实际使用时根据需要处理  private String uploadFile = "/sdcard/testimg.jpg";  private String srcPath = "/sdcard/testimg.jpg";  // 服务器上接收文件的处理页面，这里根据需要换成自己的  private String actionUrl = "http://10.100.1.208/receive_file.php";  private TextView mText1;  private TextView mText2;  private Button mButton;  @Override  public void onCreate(Bundle savedInstanceState)  {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    mText1 = (TextView) findViewById(R.id.myText2);    mText1.setText("文件路径：\n" + uploadFile);    mText2 = (TextView) findViewById(R.id.myText3);    mText2.setText("上传网址：\n" + actionUrl);    /* 设置mButton的onClick事件处理 */    mButton = (Button) findViewById(R.id.myButton);    mButton.setOnClickListener(new View.OnClickListener()    {      @Override      public void onClick(View v)      {        uploadFile(actionUrl);      }    });  }  /* 上传文件至Server，uploadUrl：接收文件的处理页面 */  private void uploadFile(String uploadUrl)  {    String end = "\r\n";    String twoHyphens = "--";    String boundary = "******";    try    {      URL url = new URL(uploadUrl);      HttpURLConnection httpURLConnection = (HttpURLConnection) url          .openConnection();      // 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃      // 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。      httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K      // 允许输入输出流      httpURLConnection.setDoInput(true);      httpURLConnection.setDoOutput(true);      httpURLConnection.setUseCaches(false);      // 使用POST方法      httpURLConnection.setRequestMethod("POST");      httpURLConnection.setRequestProperty("Connection", "Keep-Alive");      httpURLConnection.setRequestProperty("Charset", "UTF-8");      httpURLConnection.setRequestProperty("Content-Type",          "multipart/form-data;boundary=" + boundary);      DataOutputStream dos = new DataOutputStream(          httpURLConnection.getOutputStream());      dos.writeBytes(twoHyphens + boundary + end);      dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""          + srcPath.substring(srcPath.lastIndexOf("/") + 1)          + "\""          + end);      dos.writeBytes(end);      FileInputStream fis = new FileInputStream(srcPath);      byte[] buffer = new byte[8192]; // 8k      int count = 0;      // 读取文件      while ((count = fis.read(buffer)) != -1)      {        dos.write(buffer, 0, count);      }      fis.close();      dos.writeBytes(end);      dos.writeBytes(twoHyphens + boundary + twoHyphens + end);      dos.flush();      InputStream is = httpURLConnection.getInputStream();      InputStreamReader isr = new InputStreamReader(is, "utf-8");      BufferedReader br = new BufferedReader(isr);      String result = br.readLine();      Toast.makeText(this, result, Toast.LENGTH_LONG).show();      dos.close();      is.close();    } catch (Exception e)    {      e.printStackTrace();      setTitle(e.getMessage());    }  }}

在AndroidManifest.xml文件里添加网络访问权限：

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

运行结果：