Android App如何上传图片到php服务器？

// Android端代码
public void uploadImageToServer(String imagePath) {
    try {
        URL url = new URL("http://your-php-server/upload.php");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("POST");

        // 将图片转换为字节数组
        Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageData = baos.toByteArray();

        // 设置请求头
        conn.setRequestProperty("Content-Type", "application/octet-stream");
        conn.setRequestProperty("Content-Length", String.valueOf(imageData.length));

        // 发送请求
        OutputStream outputStream = conn.getOutputStream();
        outputStream.write(imageData);
        outputStream.flush();
        outputStream.close();

        // 获取服务器响应
        int responseCode = conn.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            // 上传成功
        } else {
            // 上传失败
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

// PHP端代码（upload.php）
<?php
$targetDir = "uploads/";
$targetFile = $targetDir . basename($_FILES["file"]["name"]);
$uploadOk = 1;
$imageFileType = strtolower(pathinfo($targetFile, PATHINFO_EXTENSION));

// 检查文件类型
if ($imageFileType != "jpg" && $imageFileType != "jpeg" && $imageFileType != "png") {
    echo "只允许上传jpg、jpeg、png格式的图片";
    $uploadOk = 0;
}

// 检查文件大小
if ($_FILES["file"]["size"] > 500000) {
    echo "文件大小超过限制";
    $uploadOk = 0;
}

// 检查上传状态
if ($uploadOk == 0) {
    echo "上传失败";
} else {
    if (move_uploaded_file($_FILES["file"]["tmp_name"], $targetFile)) {
        echo "上传成功";
    } else {
        echo "上传失败";
    }
}
?>