Question

我正在尝试创建一个将图像从设备上传到远程服务器的应用程序一切正常但我需要将文件的大小从几MB压缩到几十或几百KB。我做了一点研究，但我看到的只是压缩位图，在我的代码中我有一个File和FileInputStream。这是我将图像发送到服务器的java代码：

public class ImageUpload {

    private String filePath;
    private String picName;

    public ImageUpload(int num, String path) {
        filePath = path;
        picName = "Pic" + num + ".jpg";
        insertIntoServer();
    }

    public void insertIntoServer() {
        new Thread(new Runnable() {
            public void run() {
                uploadFile();
            }
        }).start();
    }

    public int uploadFile() {
        final String upLoadServerUri = "http://.../UploadToServer.php";
        HttpURLConnection conn;
        DataOutputStream dos;
        String lineEnd = "\r\n";
        String twoHyphens = "--";
        String boundary = "*****";
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1 * 1024 * 1024;
        File sourceFile = new File(filePath);
        int serverResponseCode = 0;

        if (!sourceFile.isFile()) {
            Log.e("uploadFile", "Source File not exist : " + filePath);
            return 0;
        } else {
            try {
                // open a URL connection to the Servlet
                FileInputStream fileInputStream = new FileInputStream(sourceFile);

                URL url = new URL(upLoadServerUri);

                // Open a HTTP  connection to  the URL
                conn = (HttpURLConnection) url.openConnection();
                conn.setDoInput(true); // Allow Inputs
                conn.setDoOutput(true); // Allow Outputs
                conn.setUseCaches(false); // Don't use a Cached Copy
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("ENCTYPE", "multipart/form-data");
                conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
                conn.setRequestProperty("uploaded_file", picName);

                dos = new DataOutputStream(conn.getOutputStream());

                dos.writeBytes(twoHyphens + boundary + lineEnd);
                dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\"" + picName + "\"" + lineEnd);

                dos.writeBytes(lineEnd);

                // create a buffer of  maximum size
                bytesAvailable = fileInputStream.available();

                bufferSize = Math.min(bytesAvailable, maxBufferSize);
                buffer = new byte[bufferSize];

                // read file and write it into form...
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                while (bytesRead > 0) {
                    dos.write(buffer, 0, bufferSize);
                    bytesAvailable = fileInputStream.available();
                    bufferSize = Math.min(bytesAvailable, maxBufferSize);
                    bytesRead = fileInputStream.read(buffer, 0, bufferSize);
                }

                // send multipart form data necesssary after file data...
                dos.writeBytes(lineEnd);
                dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

                // Responses from the server (code and message)
                serverResponseCode = conn.getResponseCode();

                if (serverResponseCode == 200) {
                    // Read response
                    final StringBuilder responseSB = new StringBuilder();
                    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));

                    String line;
                    while ((line = br.readLine()) != null)
                        responseSB.append(line);

                    // Close streams
                    br.close();
                }
                //close the streams //
                fileInputStream.close();
                dos.flush();
                dos.close();

            } catch (MalformedURLException ex) {
                ex.printStackTrace();
                Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
            } catch (Exception e) {
                e.printStackTrace();
                Log.e("Upload file to server Exception", "Exception : " + e.getMessage(), e);
            }
            return serverResponseCode;
        }
    }
}

这是我的PHP文件，它获取文件并将其保存在服务器上：

<?php

   $file_path = "../files/";

    $file_path = $file_path . basename( $_FILES['uploaded_file']['name']);

    if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path)) {
        echo "success";
    } else{
        echo "fail";
    }
 ?>

我的php文件或java文件需要更改什么？提前谢谢！

Answer 1

我添加了这一行：

BitmapFactory.decodeStream(fileInputStream).compress(Bitmap.CompressFormat.JPEG, 15, dos);

在这一行之后：

dos.writeBytes(lineEnd);

现在上传的图片尺寸较小。

压缩Android应用程序中的图像文件

1 个答案: