我有一个需要复制的iOs应用程序。该应用程序使用以下代码使用照片上传功能：
-(void)writePhotoToDirectory{
// check
if([appDelegate.myGlobals hasInternet]){
// show cover
[appDelegate.myGlobals showCover:@"Saving photo. Please wait..." thisView:self.view];
// vars
NSMutableData *postData = [NSMutableData data];
NSString *boundry = @"0xMyLbOuNdArY";
UIImage *uploadImage = [toUploadPhotos objectAtIndex:0];
// generate guid
CFUUIDRef theGUID = CFUUIDCreate(NULL);
CFStringRef string = CFUUIDCreateString(NULL, theGUID);
CFRelease(theGUID);
NSString *uploadImageGUID = [NSString stringWithFormat:@"%@", (__bridge NSString *)string];
NSString *uploadImageName = [NSString stringWithFormat:@"%lu-%@", (unsigned long)messageId, uploadImageGUID];
// set
CGSize imageSize = CGSizeMake((unsigned long)round(uploadImage.size.width), (unsigned long)round(uploadImage.size.height));
NSData *imageData = UIImageJPEGRepresentation(uploadImage, 0.9);
//NSLog(@"this image %@", imageData);
// set directory varable
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"dirname\"; filename=\"%@\"\r\n\r\n", @""] dataUsingEncoding:NSUTF8StringEncoding]];
// set image data
[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"uploaded\"; filename=\"%@.jpg\"\r\n\r\n", uploadImageName] dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:imageData];
// end
[postData appendData: [[NSString stringWithFormat:@"\r\n--%@--\r\n", boundry] dataUsingEncoding:NSUTF8StringEncoding]];
// url and request
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@/messagePhotoUploader.php", [appDelegate.myGlobals baseURL]]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setValue:[NSString stringWithFormat:@"%lu", (unsigned long)postData.length] forHTTPHeaderField:@"Content-Length"];
[request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundry] forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSLog(@"this post string %@?%@", url, [[NSString alloc] initWithData:postData encoding:NSUTF8StringEncoding]);
// show network activity
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
// send
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
// show network activity
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
// check
if(error) {
// handle error
[self webserviceDidNotSucceed:error];
}
else{
// handle success
//proceed
}
}];
}
else{
// alert
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Internet" message:@"Oops! You currently do not have an internet connection. Please try again later." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
}
我的问题是我不明白这是如何工作的，我需要对android做同样的功能。我怎么能这样做。请帮忙。
编辑：
忘记添加我尝试过的东西：
private String multipartRequest(String urlTo, String filepath) {
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
InputStream inputStream = null;
String twoHyphens = "--";
String lineEnd = "\r\n";
String result = "";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
try {
File file = new File(filepath);
FileInputStream fileInputStream = new FileInputStream(file);
URL url = new URL(urlTo);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("User-Agent", "Android Multipart HTTP Client 1.0");
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
outputStream = new DataOutputStream(connection.getOutputStream());
outputStream.writeBytes(lineEnd+twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"dirname\"; filename=\"" + this.fileName + "\"" + lineEnd+lineEnd);
outputStream.writeBytes(lineEnd+twoHyphens+boundary+lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded\"; filename=\"" + this.fileName + ".jpg\"" + lineEnd+lineEnd);
outputStream.writeBytes(imageData);
outputStream.writeBytes(lineEnd+twoHyphens+boundary+twoHyphens+lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
if (200 != connection.getResponseCode()) {
callBacks.didUploadFailed(connection.getResponseCode()+"",connection.getResponseMessage(),this);
}
inputStream = connection.getInputStream();
result = this.convertStreamToString(inputStream);
Log.e(TAG,">>>>>"+result);
fileInputStream.close();
inputStream.close();
outputStream.flush();
outputStream.close();
return result;
} catch (Exception e) {
e.printStackTrace();
callBacks.didUploadFailed("-1",e.getLocalizedMessage(),this);
}
return "";
}
答案 0 :(得分：0)
经过大量的调整和研究后，我发现我通过图像的方式是错误的。在我昨天的代码中，我将图像位图转换为base64字符串，然后将该字符串转换为bytes数组。这是错误的，因为我必须直接将位图图像转换为字节数组：
java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG,100,baos);
byte[] b = baos.toByteArray();
imageBytes = b;
并将其传递到我的输出流outputStream.writeBytes(imageData);部分，并将其更改为outputStream.write(imageBytes);。
我希望这有助于像我这样的初学者，他们无法从SO的“专家”那里获得帮助。