phonegap文件下传（Java，PHP）

phonegap中的FileTransfer对象介绍：

http://docs.phonegap.com/en/1.6.1/cordova_file_file.md.html#FileTransfer

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今天的代码为同学所整理。在此记下来，供以后参考

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FileTransfer ? is an object that allows you to upload files to a server or download files from a server.

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用于传文件到服务器端

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它里面有示例，写得已经是非常的详细，其中有一段：

var options = new FileUploadOptions();
options.fileKey="file";
options.fileName=fileURI.substr(fileURI.lastIndexOf('/')+1);
options.mimeType="text/plain";

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前端的完整版可以参考：http://www.oschina.net/question/200138_34919

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今天在做图片上传的时候，怎整也无法在后端获取文件流，其中的Java逻辑如下：

int MAX_SIZE = 102400 * 102400;

			DataInputStream in = null;
			FileOutputStream fileOut = null;

			String contentType = request.getContentType();
			try {
				if (contentType.indexOf("multipart/form-data") >= 0) {
					in = new DataInputStream(request.getInputStream());
					int formDataLength = request.getContentLength();
					if (formDataLength > MAX_SIZE) {
						return;
					}
					byte dataBytes[] = new byte[formDataLength];
					int byteRead = 0;
					int totalBytesRead = 0;
					while (totalBytesRead < formDataLength) {
						byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
						totalBytesRead += byteRead;
					}
					String file = new String(dataBytes);
					String saveFile = file.substring(file.indexOf("filename=\"") + 10);
					saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
					saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1, saveFile.indexOf("\""));
					int lastIndex = contentType.lastIndexOf("=");
					String boundary = contentType.substring(lastIndex + 1,contentType.length());

					int pos;
					pos = file.indexOf("filename=\"");
					pos = file.indexOf("\n", pos) + 1;
					pos = file.indexOf("\n", pos) + 1;
					pos = file.indexOf("\n", pos) + 1;
					int boundaryLocation = file.indexOf(boundary, pos) - 4;
					// 取得文件数据的开始的位置
					int startPos = ((file.substring(0, pos)).getBytes()).length;
					// 取得文件数据的结束的位置
					int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;

					// 创建文件的写出类
					fileOut = new FileOutputStream(System.getProperty("java.io.tmpdir") + "/aa.jpg");
					// 保存文件的数据
					fileOut.write(dataBytes, startPos, (endPos - startPos));
					fileOut.close();
				} 
			} catch (Exception ex) {
				throw new ServletException(ex.getMessage());
			}

?后来才发现，原来是少了一个致命的参数：options.chunkedMode = false;

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关于chunkedMode的解析，请看：http://www.issociate.de/board/post/368589/How_to_force_the_apache_transfer_the_data_in_chunked_mode?.html

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大意是：如果文件长度无法预知时，使用chuckedMode模式传输，现在传输的是图片，大小已经知道，不知道为何apache服务器处理不过来，一定要将chunkedMode设成false，至此上传成功，感觉同学指点

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为了这个参数，我还对比了php版本的文件上传：php的server端这样写的：

// If retrieving an image
else if (isset($_GET['image'])) {
    $file = $dirname."/".$_GET['image'];

    // Specify as jpeg
    header('Content-type: image/jpeg');
  
    // Resize image for mobile
    list($width, $height) = getimagesize($file); 
    $newWidth = 120.0; 
    $size = $newWidth / $width;
    $newHeight = $height * $size; 
    $resizedImage = imagecreatetruecolor($newWidth, $newHeight); 
    $image = imagecreatefromjpeg($file); 
    imagecopyresampled($resizedImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height); 
    imagejpeg($resizedImage, null, 80); 
}



// If displaying images
else {
    $baseURI = "http://".$_SERVER['SERVER_NAME'].':'.$_SERVER['SERVER_PORT'].$_SERVER['REQUEST_URI'];
    $images = scandir($dirname);
    $ignore = Array(".", "..");
    if ($images) {
        foreach($images as $curimg){ 
            if (!in_array($curimg, $ignore)) {
                echo "Image: ".$curimg."
";
                echo "
"; 
            }
        }
    }
    else {
        echo "No images on server";
    }
}
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?php的代码参考：https://github.com/brycecurtis/articles/tree/master/CameraUpload

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代码说明及解说在：https://www.ibm.com/developerworks/mydeveloperworks/blogs/94e7fded-7162-445e-8ceb-97a2140866a9/entry/upload_a_picture_using_phonegap_on_android8?lang=en

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php版本的这个前端代码：

// Verify server has been entered
        server = document.getElementById('serverUrl').value;
        if (server) {
        	
            // Specify transfer options
            var options = new FileUploadOptions();
            options.fileKey="file";
            options.fileName=imageURI.substr(imageURI.lastIndexOf('/')+1);
            options.mimeType="image/jpeg";
            options.chunkedMode = false;



            // Transfer picture to server
            var ft = new FileTransfer();
            ft.upload(imageURI, server, function(r) {
                document.getElementById('camera_status').innerHTML = "Upload successful: "+r.bytesSent+" bytes uploaded.";            	
            }, function(error) {
                document.getElementById('camera_status').innerHTML = "Upload failed: Code = "+error.code;            	
            }, options);
        }

?确实是含有chunkedMode=false的设置，并在本机运行通过。