java上传40G的文件代码
时间: 2024-09-13 09:18:37 浏览: 10
在Java中上传大文件通常需要使用流式处理来避免内存溢出,因为一次性加载一个40GB的文件到内存中是不现实的。下面是一个使用Apache Commons IO库和Java标准库中的`FileInputStream`以及`HttpURLConnection`来上传大文件的简单示例代码:
```java
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class LargeFileUploader {
public static void uploadFile(String targetURL, File file) throws Exception {
HttpURLConnection connection = null;
BufferedInputStream in = null;
OutputStream out = null;
try {
// 打开连接
URL url = new URL(targetURL);
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true); // 允许输出
connection.setRequestMethod("POST"); // 设置请求方法为POST
connection.setRequestProperty("Content-Length", String.valueOf(file.length())); // 设置要上传文件的总大小
// 发送请求
out = connection.getOutputStream();
in = new BufferedInputStream(new FileInputStream(file));
// 读取文件并发送数据
byte dataBuffer[] = new byte[1024];
int bytesRead;
while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
out.write(dataBuffer, 0, bytesRead);
}
// 获取服务器响应
int responseCode = connection.getResponseCode();
System.out.println("Response Code: " + responseCode);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭流和连接
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
if (connection != null) {
connection.disconnect();
}
}
}
public static void main(String[] args) {
try {
File file = new File("path/to/your/largefile.iso"); // 替换为你的文件路径
uploadFile("http://your.server.com/upload", file);
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
在使用上述代码之前,请确保已经添加了Apache Commons IO库依赖到你的项目中。另外,请替换`targetURL`和`file`路径为你实际的上传地址和文件路径。