In this quick tutorial we’re going to take a look at converting an InputStream to a Reader using Java, then Guava and finally Apache Commons IO.
在这个快速教程中，我们将看看使用Java将InputStream转换为Reader，然后是Guava，最后是Apache Commons IO。
This article is part of the “Java – Back to Basic” series here on Baeldung.
本文是“Java – Back to Basic“系列的一部分，在Baeldung这里。
1. With Java
1.使用Java
First, let’s look at the simple Java solution – using the readily available InputStreamReader:
首先，让我们看一下简单的Java解决方案–使用现成的InputStreamReader。
@Test
public void givenUsingPlainJava_whenConvertingInputStreamIntoReader_thenCorrect()
throws IOException {
InputStream initialStream = new ByteArrayInputStream("With Java".getBytes());
Reader targetReader = new InputStreamReader(initialStream);
targetReader.close();
}2. With Guava
2.有番石榴
Next – let’s take a look at the Guava solution – using an intermediary byte array and String:
接下来–让我们看看Guava的解决方案–使用一个中间的字节数组和String。
@Test
public void givenUsingGuava_whenConvertingInputStreamIntoReader_thenCorrect()
throws IOException {
InputStream initialStream = ByteSource.wrap("With Guava".getBytes()).openStream();
byte[] buffer = ByteStreams.toByteArray(initialStream);
Reader targetReader = CharSource.wrap(new String(buffer)).openStream();
targetReader.close();
}Note that the Java solution is simpler than this approach.
请注意，Java的解决方案比这种方法更简单。
3. With Commons IO
3.使用Commons IO
Finally – the solution using Apache Commons IO – also using an intermediary String:
最后–使用Apache Commons IO的解决方案–也是使用一个中间的String。
@Test
public void givenUsingCommonsIO_whenConvertingInputStreamIntoReader_thenCorrect()
throws IOException {
InputStream initialStream = IOUtils.toInputStream("With Commons IO");
byte[] buffer = IOUtils.toByteArray(initialStream);
Reader targetReader = new CharSequenceReader(new String(buffer));
targetReader.close();
}And there you have it – 3 quick ways to convert the input stream to a Java Reader. Make sure to check out the sample over on GitHub.