Groovy使用HttpURLConnection发布大型内容

import java.net.HttpURLConnection
import java.net.URL
import java.io.File

def uploadFile(String url, File file) {
    HttpURLConnection connection = null
    try {
        // 创建URL对象
        URL urlObj = new URL(url)
        
        // 打开连接
        connection = (HttpURLConnection) urlObj.openConnection()
        
        // 设置请求方法为POST
        connection.setRequestMethod("POST")
        
        // 设置是否向服务器输出数据
        connection.setDoOutput(true)
        
        // 获取文件长度
        long fileLength = file.length()
        
        // 设置请求头，指定Content-Length
        connection.setRequestProperty("Content-Length", String.valueOf(fileLength))
        
        // 获取文件输入流
        def fileInputStream = new FileInputStream(file)
        
        // 获取连接的输出流
        def outputStream = connection.getOutputStream()
        
        // 创建缓冲区
        byte[] buffer = new byte[4096]
        int bytesRead = -1
        
        // 从文件输入流读取数据，并写入连接的输出流
        while ((bytesRead = fileInputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead)
        }
        
        // 关闭文件输入流和连接的输出流
        fileInputStream.close()
        outputStream.close()
        
        // 获取响应码
        int responseCode = connection.getResponseCode()
        
        // 处理响应
        if (responseCode == HttpURLConnection.HTTP_OK) {
            // 上传成功
            println("上传成功")
        } else {
            // 上传失败
            println("上传失败")
        }
    } catch (Exception e) {
        e.printStackTrace()
    } finally {
        // 关闭连接
        if (connection != null) {
            connection.disconnect()
        }
    }
}

// 使用示例
def file = new File("path/to/file")
uploadFile("http://example.com/upload", file)