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：