在Java中，可以使用`URL`和`URLConnection`类来下载文件到本地。以下是一个基本示例：

```java

import java.io.BufferedInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.net.URL;

import java.net.URLConnection;

public class FileDownloader {

public static void main(String[] args) throws IOException {

String fileUrl = "";

String savePath = "/path/to/save/file.pdf";

URL url = new URL(fileUrl);

URLConnection connection = url.openConnection();

try (BufferedInputStream in = new BufferedInputStream(connection.getInputStream());

FileOutputStream out = new FileOutputStream(savePath)) {

byte[] buffer = new byte[1024];

int bytesRead;

while ((bytesRead = in.read(buffer)) != -1) {

out.write(buffer, 0, bytesRead);

}

System.out.println("File downloaded successfully!");

} catch (IOException e) {

e.printStackTrace();

}

}

}

```

这个程序将从给定的URL下载文件，并保存到指定的路径，确保替换 `fileUrl` 和 `savePath` 变量为你自己需要的实际值。