由网友(酒香)分享简介：我使用下面的code，从我的服务器下载一个文件，然后把它写入SD卡的根目录下，这一切工作正常：包com.downloader;进口的java.io.File;进口java.io.FileOutputStream中;进口的java.io.InputStream;进口java.net.HttpURLConnectio...

我使用下面的code，从我的服务器下载一个文件，然后把它写入SD卡的根目录下，这一切工作正常：

 包com.downloader;

进口的java.io.File;
进口java.io.FileOutputStream中;
进口的java.io.InputStream;
进口java.net.HttpURLConnection中;
进口的java.net.URL;

进口android.os.Environment;
进口android.util.Log;

公共类下载{

    公共无效DownloadFile（字符串fileURL，字符串文件名）{
        尝试 {
            文件根= Environment.getExternalStorageDirectory（）;
            网址U =新的URL（fileURL）;
            HttpURLConnection的C =（HttpURLConnection类）u.openConnection（）;
            c.setRequestMethod（GET）;
            c.setDoOutput（真正的）;
            c.connect（）;
            FileOutputStream中F =新的FileOutputStream（新文件（根目录，文件名））;

            在的InputStream = c.getInputStream（）;

            byte []的缓冲区=新的字节[1024];
            INT LEN1 = 0;
            而（（LEN1 = in.read（缓冲液））大于0）{
                f.write（缓冲液，0，LEN1）;
            }
            f.close（）;
        }赶上（例外五）{
            Log.d（下载，e.getMessage（））;
        }

    }
}
 

然而，使用 Environment.getExternalStorageDirectory（）; 意味着该文件将永远写入根到/ mnt / SD卡。是否可以指定一个特定的文件夹写入文件？

例如：到/ mnt / SD卡/ MyApp的/下载

干杯

EEF

解决方案

 文件SD卡= Environment.getExternalStorageDirectory（）;
文件DIR =新的文件（sdCard.getAbsolutePath（）+/ DIR1 / DIR2）;
dir.mkdirs（）;
档案文件=新的文件（目录，文件名）;

FileOutputStream中F =新的FileOutputStream（文件）;
...
 

I am using the following code to download a file from my server then write it to the root directory of the sd card, it all works fine:

package com.downloader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.os.Environment;
import android.util.Log;

public class Downloader {

    public void DownloadFile(String fileURL, String fileName) {
        try {
            File root = Environment.getExternalStorageDirectory();
            URL u = new URL(fileURL);
            HttpURLConnection c = (HttpURLConnection) u.openConnection();
            c.setRequestMethod("GET");
            c.setDoOutput(true);
            c.connect();
            FileOutputStream f = new FileOutputStream(new File(root, fileName));

            InputStream in = c.getInputStream();

            byte[] buffer = new byte[1024];
            int len1 = 0;
            while ((len1 = in.read(buffer)) > 0) {
                f.write(buffer, 0, len1);
            }
            f.close();
        } catch (Exception e) {
            Log.d("Downloader", e.getMessage());
        }

    }
}

However, using Environment.getExternalStorageDirectory(); means that the file will always write to the root /mnt/sdcard. Is it possible to specify a certain folder to write the file to?

For example: /mnt/sdcard/myapp/downloads

Cheers

Eef

解决方案

File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/dir1/dir2");
dir.mkdirs();
File file = new File(dir, "filename");

FileOutputStream f = new FileOutputStream(file);
...