如何从网站下载整个文件 [英] How to download whole file from website

问题描述

我举了这个例子： http：/ /www.mkyong.com/java/how-to-download-file-from-website-java-jsp

File file = new File("path/to/file/test.txt");
FileInputStream fis= new FileInputStream(file);
ServletOutputStream out = response.getOutputStream();

byte[] outputByte = new byte[4096];
//copy binary contect to output stream
while(fis.read(outputByte, 0, 4096) != -1)
{
    out.write(outputByte, 0, 4096);
}
fis.close();
out.flush();
out.close();

问题是下载文件仍然不完整。在文件的末尾仍然缺少一些字符

problem is that download file is still incomplete. At the end of file there is still missing some characters

所以我尝试了另一个例子：

so I try another example:

File file = new File("path/to/file/test.txt");
FileInputStream fis= new FileInputStream(file);


IOUtils.copy(fis,response.getOutputStream());
fis.close();

下载文件已完成。所以我的问题是为什么第一个例子不起作用，第二个例子是正确的

download file is complete. So my question is why first example doesnt work and is second example is correct

推荐答案

不确定这是否是原因但是你可以更换这个

Not sure if that is cause but could you replace this

//copy binary contect to output stream
while(fis.read(outputByte, 0, 4096) != -1)
{
    out.write(outputByte, 0, 4096);
}

int length=-1;
while ( (length = fis.read(outputByte, 0, 4096)) != -1) {
    out.write(outputByte, 0, length);
}

告诉我们怎么回事？

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