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：