使用Java下载ftp csv文件

Question

I successfully download a csv file stored in ftp server using the code below.

URL url = new URL(ftpUrl); 
URLConnection conn = url.openConnection();

InputStream inputStream = conn.getInputStream();
long filesize = conn.getContentLength();
byte[] buffer = new byte[4096];
int bytesRead = -1;

while ((bytesRead = inputStream.read(buffer)) != -1) {
    String str = new String(buffer, "UTF-8");
    out.println(str);
} 

The csv file has 1276KB filesize and about 20.000 rows. The problem is that the generated csv file has some lines either blank or with missing information. The damaged rows occur about every 100 records. I tried to fix by increasing the buffer size but damaged rows still exist. Any help is going to be appreciated :)

Answer 1

Sure! you have to tell how long is the string: except when the file size is a multiple of 4096, you will always get old items in buffer

You must use this syntax instead

String str = new String(buffer, 0, bytesRead, "utf-8");