我想将文件上传到 PHP 脚本。上传似乎工作正常，它正在发送数据。但是 PHP 脚本每次都告诉我，$_FILES 是空的……我不知道我做错了什么……知道我的代码有什么问题吗？
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Random;
import android.content.Context;
import android.net.Uri;
import android.os.AsyncTask;
import android.provider.Settings.Secure;
import android.util.Log;
public class Upload extends AsyncTask<Object, Integer, String> {
URL connectURL;
String responseString;
String usernameString;
Context con;
String iFileName;
byte[] dataToServer;
FileInputStream fileInputStream = null;
void Sending() {
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
String Tag = "Info";
try {
Log.e(Tag, "Starting Http File Sending to URL");
// Open a HTTP connection to the URL
HttpURLConnection conn = (HttpURLConnection) connectURL.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
Log.d("Info", iFileName);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + iFileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
Log.e(Tag, "Headers are written");
// create a buffer of maximum size
int bytesAvailable = fileInputStream.available();
int maxBufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
byte[] buffer = new byte[bufferSize];
// read file and write it into form...
int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
Log.e(Tag, "sending...");
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
fileInputStream.close();
dos.flush();
Log.e(Tag, "File Sent, Response: " + String.valueOf(conn.getResponseCode()));
InputStream is = conn.getInputStream();
// retrieve the response from server
int ch;
StringBuffer b = new StringBuffer();
while ((ch = is.read()) != -1) {
b.append((char) ch);
}
String s = b.toString();
Log.i("Response", s);
dos.close();
String aidString = Secure.getString(con.getContentResolver(), Secure.ANDROID_ID);
//new BackgroundPost(new OnTaskComplete() {}).execute(usernameString, s, "0", "0", aidString, "");
} catch (MalformedURLException ex) {
Log.e(Tag, "URL error: " + ex.getMessage(), ex);
}
catch (IOException ioe) {
Log.e(Tag, "IO error: " + ioe.getMessage(), ioe);
}
}
public void run() {
// TODO Auto-generated method stub
}
@Override
protected String doInBackground(Object... params) {
try {
connectURL = new URL(conf.d + "upload.php");
usernameString = String.valueOf(params[0]);
con = (Context)params[1];
Random random = new Random();
String u = (String) params[2];
Log.d("Info","u: " + u);
iFileName = random.nextInt() + "." + u.substring(u.lastIndexOf(".")+1);
Log.d("Info","filename: " + iFileName);
fileInputStream = new FileInputStream(u);
Sending();
} catch (Exception ex) {
ex.printStackTrace();
Log.i("HttpFileUpload", "URL Malformatted");
}
// TODO Auto-generated method stub
return null;
}
}
和 PHP 文件：
<?php
$target_path = "uploads/";
print_r($_FILES);
$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!";
}
?>