Android是目前市场上流行的移动操作系统之一，很多应用都需要上传图片至服务器，但有时需要裁剪图片以满足不同的需求。本篇文章将介绍如何从Android设备中裁剪图片并上传至服务器。

一、裁剪图片

在Android中，我们可以使用系统自带的裁剪功能，也可以使用第三方库来实现裁剪。这里介绍一下常用的第三方库Picasso和Glide：

Picasso裁剪图片：

Picasso.with(context).load(imageUrl).resize(width, height).centerCrop().into(imageView);// 设置imageView高度和宽度

Glide裁剪图片：

Glide.with(context)
   .load(imageUrl)
   .override(width, height)
   .transform(new CenterCrop())
   .into(imageView);

二、上传图片

1.使用HttpURLConnection上传图片：

private void uploadImage(String imagePath) {
  String end = "\r\n";
  String twoHyphens = "--";
  String boundary = "******";
  try {
    URL url = new URL("your server url");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoInput(true);
    connection.setDoOutput(true);
    connection.setUseCaches(false);
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Connection", "keep-alive");
    connection.setRequestProperty("Charset", "UTF-8");
    connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
    DataOutputStream dos = new DataOutputStream(connection.getOutputStream());
    dos.writeBytes(twoHyphens + boundary + end);
    dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""
        + imagePath.substring(imagePath.lastIndexOf("/") + 1)
        + "\""
        + end);
    dos.writeBytes(end);
    FileInputStream fis = new FileInputStream(imagePath);
    byte[] buffer = new byte[8192];
    int count = 0;
    while ((count = fis.read(buffer)) != -1) {
      dos.write(buffer, 0, count);
    }
    fis.close();
    dos.writeBytes(end);
    dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
    dos.flush();
    InputStream is = connection.getInputStream();
    InputStreamReader isr = new InputStreamReader(is, "utf-8");
    BufferedReader reader = new BufferedReader(isr);
    StringBuilder builder = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
      builder.append(line);
    }
    Log.i(TAG, "upload response: " + builder.toString());
    dos.close();
    is.close