java如何下载文件到本地

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在 Java 中，可以使用 URLConnection 类来下载文件到本地。以下是一个简单的示例代码：

import java.io.*;
import java.net.URL;
import java.net.URLConnection;

public class FileDownloader {public static void main(String[] args) {String fileUrl = "http://example.com/sample.jpg";
        String saveDir = "C:/Downloads/";
        
        try {URL url = new URL(fileUrl);
            URLConnection connection = url.openConnection();
            InputStream inputStream = connection.getInputStream();
            
            String fileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1);
            FileOutputStream outputStream = new FileOutputStream(saveDir + fileName);
            
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);
            }
            
            outputStream.close();
            inputStream.close();
            
            System.out.println("File downloaded successfully!");
        } catch (IOException e) {e.printStackTrace();
        }
    }
}