在android方面.

Fileuploader.java

public class FileUploader {
    private final String boundary;
    private static final String LINE_Feed = "\r\n";
    private HttpURLConnection httpConn;
    private String charset;
    private OutputStream outputStream;
    private PrintWriter writer;

    public FileUploader(String requestURL,String charset)
            throws IOException {
        this.charset = charset;

        // creates a unique boundary based on time stamp
        boundary = "===" + System.currentTimeMillis() + "===";

        URL url = new URL(requestURL);
        httpConn = (HttpURLConnection) url.openConnection();
        httpConn.setUseCaches(false);
        httpConn.setDoOutput(true); // indicates POST method
        httpConn.setDoInput(true);
        httpConn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + boundary);
        httpConn.setRequestProperty("User-Agent","CodeJava Agent");
        httpConn.setRequestProperty("Test","Bonjour");
        outputStream = httpConn.getOutputStream();
        writer = new PrintWriter(new OutputStreamWriter(outputStream,charset),true);
    }

    /**
     * Adds a form field to the request
     * @param name field name
     * @param value field value
     */
    public void addFormField(String name,String value) {
        writer.append("--" + boundary).append(LINE_Feed);
        writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
                .append(LINE_Feed);
        writer.append("Content-Type: text/plain; charset=" + charset).append(
                LINE_Feed);
        writer.append(LINE_Feed);
        writer.append(value).append(LINE_Feed);
        writer.flush();
    }

    /**
     * Adds a upload file section to the request
     * @param fieldName name attribute in <input type="file" name="..." />
     * @param uploadFile a File to be uploaded
     * @throws IOException
     */
    public void addFilePart(String fieldName,File uploadFile)
            throws IOException {
        String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE_Feed);
        writer.append(
                "Content-Disposition: form-data; name=\"" + fieldName
                        + "\"; filename=\"" + fileName + "\"")
                .append(LINE_Feed);
        writer.append(
                "Content-Type: "
                        + URLConnection.guessContentTypeFromName(fileName))
                .append(LINE_Feed);
        writer.append("Content-Transfer-Encoding: binary").append(LINE_Feed);
        writer.append(LINE_Feed);
        writer.flush();

        FileInputStream inputStream = new FileInputStream(uploadFile);
        byte[] buffer = new byte[4096];
        int bytesRead = -1;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer,bytesRead);
        }
        outputStream.flush();
        inputStream.close();

        writer.append(LINE_Feed);
        writer.flush();
    }

    /**
     * Adds a header field to the request.
     * @param name - name of the header field
     * @param value - value of the header field
     */
    public void addHeaderField(String name,String value) {
        writer.append(name + ": " + value).append(LINE_Feed);
        writer.flush();
    }

    /**
     * Completes the request and receives response from the server.
     * @return a list of Strings as response in case the server returned
     * status OK,otherwise an exception is thrown.
     * @throws IOException
     */
    public List<String> finish() throws IOException {
        List<String> response = new ArrayList<String>();

        writer.append(LINE_Feed).flush();
        writer.append("--" + boundary + "--").append(LINE_Feed);
        writer.close();

        // checks server's status code first
        int status = httpConn.getResponseCode();
        if (status == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    httpConn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                response.add(line);
            }
            reader.close();
            httpConn.disconnect();
        } else {
            throw new IOException("Server returned non-OK status: " + status);
        }

        return response;
    }
}

On mainactivity file

在mainactivity.java上只调用这个函数,而imgPaths是图像路径的数组.

public void uploadFile(ArrayList<String> imgPaths) {

        String charset = "UTF-8";
        //File uploadFile1 = new File("e:/Test/PIC1.JPG");
        //File uploadFile2 = new File("e:/Test/PIC2.JPG");

        File sourceFile[] = new File[imgPaths.size()];
        for (int i=0;i<imgPaths.size();i++){
            sourceFile[i] = new File(imgPaths.get(i));
           // Toast.makeText(getApplicationContext(),imgPaths.get(i),Toast.LENGTH_SHORT).show();
        }

        String requestURL = "your API";

        try {
            FileUploader multipart = new FileUploader(requestURL,charset);

            multipart.addHeaderField("User-Agent","CodeJava");
            multipart.addHeaderField("Test-Header","Header-Value");

            multipart.addFormField("description","Cool Pictures");
            multipart.addFormField("keywords","Java,upload,Spring");

            for (int i=0;i<imgPaths.size();i++){
                multipart.addFilePart("uploaded_file[]",sourceFile[i]);
            }

            /*multipart.addFilePart("fileUpload",uploadFile1);
            multipart.addFilePart("fileUpload",uploadFile2);*/

            List<String> response = multipart.finish();

            System.out.println("SERVER REPLIED:");

            for (String line : response) {
                System.out.println(line);
            }
        } catch (IOException ex) {
            System.err.println(ex);
        }
    }

uploader.PHP

foreach ($_FILES["uploaded_file"]["error"] as $key => $error) {
    if ($error == UPLOAD_ERR_OK) {
        $tmp_name = $_FILES["uploaded_file"]["tmp_name"][$key];
        $name = $_FILES["uploaded_file"]["name"][$key];
    $file_path = "../post_uploaded_images/";
        $file_path = $file_path . $name;
            if(@move_uploaded_file($tmp_name,$file_path)) 
            {
               echo "success";

            } else{

                echo "fail";
            }   
    }
}