java txt大文件下载

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mob64ca12e2442a 2024-05-27 05:22:24 ©著作权

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如何实现 Java txt 大文件下载

1. 流程图

stateDiagram
    [*] --> 开始
    开始 --> 下载文件
    下载文件 --> 结束
    结束 --> [*]

2. 步骤

步骤	操作
1	打开输入流，读取要下载的大文件
2	打开输出流，将文件内容写入到本地文件
3	关闭输入流和输出流

3. 代码实现

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;

public class FileDownload {

    public static void downloadFile(String fileUrl, String saveDir) throws IOException {
        URL url = new URL(fileUrl);
        URLConnection connection = url.openConnection();
        try (BufferedInputStream in = new BufferedInputStream(connection.getInputStream());
             BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(saveDir))) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
            }
        }
    }

    public static void main(String[] args) {
        String fileUrl = "
        String saveDir = "C:\\downloads\\largefile.txt";
        try {
            downloadFile(fileUrl, saveDir);
            System.out.println("File downloaded successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}