如何在 JSP(java) 中实现 PHP file_get_contents() 函数？
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how to implement PHP file_get_contents() function in JSP(java)?
提问by Koerr
In PHP we can use file_get_contents()like this:
在 PHP 中我们可以这样使用file_get_contents()：
<?php
$data = file_get_contents('php://input');
echo file_put_contents("image.jpg", $data);
?>
How can I implement this in Java (JSP)?
我如何在 Java (JSP) 中实现它？
回答by ólafur Waage
Here's a function I created in Java a while back that returns a String of the file contents. Hope it helps.
这是我不久前在 Java 中创建的一个函数，它返回文件内容的字符串。希望能帮助到你。
There might be some issues with \n and \r but it should get you started at least.
\n 和 \r 可能存在一些问题，但至少应该让您开始。
// Converts a file to a string
private String fileToString(String filename) throws IOException
{
BufferedReader reader = new BufferedReader(new FileReader(filename));
StringBuilder builder = new StringBuilder();
String line;
// For every line in the file, append it to the string builder
while((line = reader.readLine()) != null)
{
builder.append(line);
}
reader.close();
return builder.toString();
}
回答by Kaivosukeltaja
This will read a file from an URL and write it to a local file. Just add try/catch and imports as needed.
这将从 URL 读取文件并将其写入本地文件。只需根据需要添加 try/catch 和导入。
byte buf[] = new byte[4096];
URL url = new URL("http://path.to.file");
BufferedInputStream bis = new BufferedInputStream(url.openStream());
FileOutputStream fos = new FileOutputStream(target_filename);
int bytesRead = 0;
while((bytesRead = bis.read(buf)) != -1) {
fos.write(buf, 0, bytesRead);
}
fos.flush();
fos.close();
bis.close();
