Java文件下载指定路径

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mob64ca12e33720 2024-06-29 05:17:35 ©著作权

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如何实现Java文件下载指定路径

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	代码示例
1	创建URL对象	`URL url = new URL(fileUrl);`
2	打开URLConnection连接	`URLConnection conn = url.openConnection();`
3	设置请求头参数	`conn.setRequestProperty("User-Agent", "Mozilla/5.0");`
4	获取输入流	`InputStream in = conn.getInputStream();`
5	创建输出流	`FileOutputStream out = new FileOutputStream(filePath);`
6	缓冲数据写入文件	`byte[] buffer = new byte[1024];`<br>`int bytesRead;`<br>`while ((bytesRead = in.read(buffer)) != -1) {`<br>`out.write(buffer, 0, bytesRead);`<br>`}`
7	关闭输入输出流	`in.close();`<br>`out.close();`

3. 代码示例

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

public class FileDownloader {

    public static void downloadFile(String fileUrl, String filePath) throws IOException {
        URL url = new URL(fileUrl);
        URLConnection conn = url.openConnection();
        conn.setRequestProperty("User-Agent", "Mozilla/5.0");
        
        InputStream in = conn.getInputStream();
        FileOutputStream out = new FileOutputStream(filePath);
        
        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = in.read(buffer)) != -1) {
            out.write(buffer, 0, bytesRead);
        }
        
        in.close();
        out.close();
    }

    public static void main(String[] args) {
        String fileUrl = "
        String filePath = "/path/to/download/sample.pdf";
        
        try {
            downloadFile(fileUrl, filePath);
            System.out.println("文件下载成功！");
        } catch (IOException e) {
            System.out.println("文件下载失败：" + e.getMessage());
        }
    }
}