Android上传文件到Web服务器,PHP接收文件

jopen 8年前

      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:


Android上传文件到Web服务器,PHP接收文件

以上已经能够实现文件上传,但没有上传进度。这次在之前的基础上添加进度显示,Java代码如下所示:

package com.lenovo.uptest;    import java.io.DataInputStream;  import java.io.DataOutputStream;  import java.io.File;  import java.io.FileInputStream;  import java.net.HttpURLConnection;  import java.net.URL;    import android.app.Activity;  import android.app.AlertDialog;  import android.app.ProgressDialog;  import android.content.DialogInterface;  import android.os.AsyncTask;  import android.os.Bundle;  import android.view.View;  import android.widget.Button;  import android.widget.TextView;    public class UploadtestActivity extends Activity {   /** Called when the activity is first created. */   /**    * Upload file to web server with progress status, client: android;    * server:php    * **/     private TextView mtv1 = null;   private TextView mtv2 = null;   private Button bupload = null;     private String uploadFile = "/sdcard/testimg.jpg";   private String actionUrl = "http://10.100.1.208/receive_file.php";     @Override   public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);      mtv1 = (TextView) findViewById(R.id.mtv1);    mtv1.setText("文件路径:\n" + uploadFile);    mtv2 = (TextView) findViewById(R.id.mtv2);    mtv2.setText("上传地址:\n" + actionUrl);    bupload = (Button) findViewById(R.id.bupload);    bupload.setOnClickListener(new View.OnClickListener() {       @Override     public void onClick(View v) {      // TODO Auto-generated method stub      FileUploadTask fileuploadtask = new FileUploadTask();      fileuploadtask.execute();     }    });   }     // show Dialog method   private void showDialog(String mess) {    new AlertDialog.Builder(UploadtestActivity.this).setTitle("Message")      .setMessage(mess)      .setNegativeButton("确定", new DialogInterface.OnClickListener() {       @Override       public void onClick(DialogInterface dialog, int which) {       }      }).show();   }     class FileUploadTask extends AsyncTask<Object, Integer, Void> {      private ProgressDialog dialog = null;    HttpURLConnection connection = null;    DataOutputStream outputStream = null;    DataInputStream inputStream = null;    //the file path to upload    String pathToOurFile = "/sdcard/testimg.jpg";    //the server address to process uploaded file    String urlServer = "http://10.100.1.208/receive_file.php";    String lineEnd = "\r\n";    String twoHyphens = "--";    String boundary = "*****";      File uploadFile = new File(pathToOurFile);    long totalSize = uploadFile.length(); // Get size of file, bytes      @Override    protected void onPreExecute() {     dialog = new ProgressDialog(UploadtestActivity.this);     dialog.setMessage("正在上传...");     dialog.setIndeterminate(false);     dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);     dialog.setProgress(0);     dialog.show();    }      @Override    protected Void doInBackground(Object... arg0) {       long length = 0;     int progress;     int bytesRead, bytesAvailable, bufferSize;     byte[] buffer;     int maxBufferSize = 256 * 1024;// 256KB       try {      FileInputStream fileInputStream = new FileInputStream(new File(        pathToOurFile));        URL url = new URL(urlServer);      connection = (HttpURLConnection) url.openConnection();        // Set size of every block for post      connection.setChunkedStreamingMode(256 * 1024);// 256KB        // Allow Inputs & Outputs      connection.setDoInput(true);      connection.setDoOutput(true);      connection.setUseCaches(false);        // Enable POST method      connection.setRequestMethod("POST");      connection.setRequestProperty("Connection", "Keep-Alive");      connection.setRequestProperty("Charset", "UTF-8");      connection.setRequestProperty("Content-Type",        "multipart/form-data;boundary=" + boundary);        outputStream = new DataOutputStream(        connection.getOutputStream());      outputStream.writeBytes(twoHyphens + boundary + lineEnd);      outputStream        .writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\""          + pathToOurFile + "\"" + lineEnd);      outputStream.writeBytes(lineEnd);        bytesAvailable = fileInputStream.available();      bufferSize = Math.min(bytesAvailable, maxBufferSize);      buffer = new byte[bufferSize];        // Read file      bytesRead = fileInputStream.read(buffer, 0, bufferSize);        while (bytesRead > 0) {       outputStream.write(buffer, 0, bufferSize);       length += bufferSize;       progress = (int) ((length * 100) / totalSize);       publishProgress(progress);         bytesAvailable = fileInputStream.available();       bufferSize = Math.min(bytesAvailable, maxBufferSize);       bytesRead = fileInputStream.read(buffer, 0, bufferSize);      }      outputStream.writeBytes(lineEnd);      outputStream.writeBytes(twoHyphens + boundary + twoHyphens        + lineEnd);      publishProgress(100);        // Responses from the server (code and message)      int serverResponseCode = connection.getResponseCode();      String serverResponseMessage = connection.getResponseMessage();        /* 将Response显示于Dialog */      // Toast toast = Toast.makeText(UploadtestActivity.this, ""      // + serverResponseMessage.toString().trim(),      // Toast.LENGTH_LONG);      // showDialog(serverResponseMessage.toString().trim());      /* 取得Response内容 */      // InputStream is = connection.getInputStream();      // int ch;      // StringBuffer sbf = new StringBuffer();      // while ((ch = is.read()) != -1) {      // sbf.append((char) ch);      // }      //      // showDialog(sbf.toString().trim());        fileInputStream.close();      outputStream.flush();      outputStream.close();       } catch (Exception ex) {      // Exception handling      // showDialog("" + ex);      // Toast toast = Toast.makeText(UploadtestActivity.this, "" +      // ex,      // Toast.LENGTH_LONG);       }     return null;    }      @Override    protected void onProgressUpdate(Integer... progress) {     dialog.setProgress(progress[0]);    }      @Override    protected void onPostExecute(Void result) {     try {      dialog.dismiss();      // TODO Auto-generated method stub     } catch (Exception e) {     }    }     }  }

       服务器端仍然和之前的一样。

        这里使用了AsyncTask,它使创建需要与用户界面交互的长时间运行的任务变得更简单,适用于简单的异步处理,不需要借助线程和Handler即可实现。
        AsyncTask是抽象类.AsyncTask定义了三种泛型类型 Params,Progress和Result。
        Params 启动任务执行的输入参数,比如HTTP请求的URL。
        Progress 后台任务执行的百分比。
        Result 后台执行任务最终返回的结果,比如String。

        AsyncTask的执行分为四个步骤,每一步都对应一个回调方法,这些方法不应该由应用程序调用,开发者需要做的就是实现这些方法。
        1) 子类化AsyncTask
        2) 实现AsyncTask中定义的下面一个或几个方法
        onPreExecute(), 该方法将在执行实际的后台操作前被UI thread调用。可以在该方法中做一些准备工作,如在界面上显示一个进度条。
        doInBackground(Params...), 将在onPreExecute 方法执行后马上执行,该方法运行在后台线程中。这里将主要负责执行那些很耗时的后台计算工作。可以调用 publishProgress方法来更新实时的任务进度。该方法是抽象方法,子类必须实现。
        onProgressUpdate(Progress...),在publishProgress方法被调用后,UI thread将调用这个方法从而在界面上展示任务的进展情况,例如通过一个进度条进行展示。
        onPostExecute(Result), 在doInBackground 执行完成后,onPostExecute 方法将被UI thread调用,后台的计算结果将通过该方法传递到UI thread.

        为了正确的使用AsyncTask类,以下是几条必须遵守的准则:
        1) Task的实例必须在UI thread中创建
        2) execute方法必须在UI thread中调用
        3) 不要手动的调用onPreExecute(), onPostExecute(Result),doInBackground(Params...), onProgressUpdate(Progress...)这几个方法
        4) 该task只能被执行一次,否则多次调用时将会出现异常
        doInBackground方法和onPostExecute的参数必须对应,这两个参数在AsyncTask声明的泛型参数列表中指定,第一个为 doInBackground接受的参数,第二个为显示进度的参数,第三个为doInBackground返回和onPostExecute传入的参数。

运行结果如下:


Android上传文件到Web服务器,PHP接收文件

转自:http://blog.csdn.net/sxwyf248/article/details/7012758