Android上传文件到Web服务器 PHP接收文件

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：

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