In this quick tutorial, we’re going to convert a simple byte array to a Reader using plain Java, Guava and finally the Apache Commons IO library.
在这个快速教程中，我们将使用普通的Java、Guava和最后的Apache Commons IO库将一个简单的字节数组转换成读取器。
This article is part of the “Java – Back to Basic” series here on Baeldung.
本文是Baeldung网站上“Java – Back to Basic “系列的一部分。
1. With Plain Java
1.使用普通的Java
Let’s start with the simple Java example, doing the conversion via an intermediary String:
让我们从简单的Java例子开始，通过一个中间的String做转换。
@Test
public void givenUsingPlainJava_whenConvertingByteArrayIntoReader_thenCorrect()
throws IOException {
byte[] initialArray = "With Java".getBytes();
Reader targetReader = new StringReader(new String(initialArray));
targetReader.close();
}An alternative approach would be to make use of an InputStreamReader and a ByteArrayInputStream:
另一种方法是利用一个InputStreamReader和一个ByteArrayInputStream。
@Test
public void givenUsingPlainJava2_whenConvertingByteArrayIntoReader_thenCorrect()
throws IOException {
byte[] initialArray = "Hello world!".getBytes();
Reader targetReader = new InputStreamReader(new ByteArrayInputStream(initialArray));
targetReader.close();
}2. With Guava
2.有番石榴
Next – let’s take a look at the Guava solution, also using an intermediary String:
接下来–让我们看看Guava的解决方案，也是使用一个中间的String。
@Test
public void givenUsingGuava_whenConvertingByteArrayIntoReader_thenCorrect()
throws IOException {
byte[] initialArray = "With Guava".getBytes();
String bufferString = new String(initialArray);
Reader targetReader = CharSource.wrap(bufferString).openStream();
targetReader.close();
}Unfortunately the Guava ByteSource utility doesn’t allow a direct conversion, so we still need to use the intermediary String representation.
不幸的是，Guava的ByteSource工具不允许直接转换，所以我们仍然需要使用中间的String表示。
3. With Apache Commons IO
3.使用Apache Commons IO
Similarly – Commons IO also uses an intermediary String representation to convert the byte[] to a Reader:
类似地–Commons IO也使用一个中间的String表示法，将byte[]转换为Reader。
@Test
public void givenUsingCommonsIO_whenConvertingByteArrayIntoReader_thenCorrect()
throws IOException {
byte[] initialArray = "With Commons IO".getBytes();
Reader targetReader = new CharSequenceReader(new String(initialArray));
targetReader.close();
}And there we have it – 3 simple ways to convert the byte array into a Java Reader. Make sure to check out the sample over on GitHub.