我不知道我是否正在将我的文件发送到web api。因为没有任何东西会向客户端请求代码发出错误。但是当我得到服务器的响应时，它会给我一个java.io.FileNotFoundException。所以我认为我的<strong]请求代码>有错误，因为它没有将任何文件上传到web服务器，我想这就是我得到java.io.FileNotFoundException的原因。请帮助我，谢谢。
HttpURLConnection conn = null;
DataOutputStream dos = null;
String samplefile = "storage/sdcard0/Pictures/Images/productshot.jpg";
String urlString = "http://avasd.server.com.ph:1217/api/fileupload";
File mFile = new File(samplefile);
int mychunkSize = 2048 * 1024;
final long size = mFile.length();
final long chunks = size < mychunkSize? 1: (mFile.length() / mychunkSize);
int chunkId = 0;
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 2 * 1024 * 1024;
try {
//Client Request
FileInputStream stream = new FileInputStream(mFile);
String lineEnd = "rn";
String twoHyphens = "--";
String boundary = "-------------------------acebdf13572468";// random data
String param1 = ""+chunkId;
String param2 = ""+chunks;
String param3 = mFile.getName();
String param4 = samplefile;
for (chunkId = 0; chunkId < chunks; chunkId++) {
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(20000 /* milliseconds */);
conn.setConnectTimeout(20000 /* milliseconds */);
// 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");
String encoded = Base64.encodeToString((_username+":"+_password).getBytes(),Base64.NO_WRAP);
conn.setRequestProperty("Authorization", "Basic "+encoded);
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setChunkedStreamingMode(0);
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
int length = (int) (param2.length() + param3.length() + mFile.length() + encoded.length() + lineEnd.length() + twoHyphens.length() + boundary.length());
conn.connect();
dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
// Send parameter #file
dos.writeBytes("Content-Disposition: form-data; name="fieldNameHere";filename="" + mFile.getName() + """ + lineEnd); // filename is the Name of the File to be uploaded
dos.writeBytes("Content-Type: image/jpeg" + lineEnd);
dos.writeBytes(lineEnd);
// Send parameter #chunks
dos.writeBytes("Content-Disposition: form-data; name="chunk"" + lineEnd);
dos.writeBytes(param2 + lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
// Send parameter #name
dos.writeBytes("Content-Disposition: form-data; name="name"" + lineEnd);
dos.writeBytes(param3 + lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
bytesAvailable = stream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = stream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = stream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = stream.read(buffer, 0, bufferSize);
Log.i("BytesAvailable", String.valueOf(bytesAvailable));
Log.i("bufferSize", String.valueOf(bufferSize));
Log.i("Bytes Read", String.valueOf(bytesRead));
Log.i("buffer", String.valueOf(buffer));
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
stream.close();
dos.flush();
dos.close();
Log.i("DOS: ", String.valueOf(dos.size()));
}
} catch (MalformedURLException ex) {
System.out.println("From CLIENT REQUEST:" + ex);
}catch (IOException ioe) {
System.out.println("From CLIENT REQUEST:" + ioe);
}catch (Exception e) {
Log.e("From CLIENT REQUEST:", e.toString());
}
//Server Response
try {
System.out.println("Server response is: n");
DataInputStream inStream = new DataInputStream(conn.getInputStream());
String str;
while ((str = inStream.readLine()) != null) {
System.out.println(str);
System.out.println("");
}
inStream.close();
System.out.println("nEND Server response ");
} catch (IOException ioex) {
System.out.println("From (ServerResponse): " + ioex);
}
我认为在将数据写入文件之前，必须确保file变量的父级可用。你可以看到下面的代码：
/**
*
* @param path
* like '/abc/temp' which will retutn '/mnt/sdcard/abc/temp'
* @return
*/
public static File getFile(String path) {
File file = new File(Environment.getExternalStorageDirectory() + path);
File parent = file.getParentFile();
if (!parent.exists()) {
parent.mkdirs();
}
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return file;
}
这是我经常使用的一个函数。希望它能有所帮助。
检查manifest.xml中的权限您应该添加访问sdcard0内存位置的权限：试试这个