java String.getBytes() 和 IOUtils.toByteArray() 的区别？
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Difference between String.getBytes() and IOUtils.toByteArray()?
提问by Falci
I'm testing the IOUtils. I have problems to convert an InputStream into a byte array:
我正在测试 IOUtils。我在将 InputStream 转换为字节数组时遇到问题：
private static final String LOREM_IPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
@Test
public void testInputStreamToByteArray() throws IOException {
byte[] expecteds = LOREM_IPSUM.getBytes();
byte[] actuals = org.apache.commons.io.IOUtils.toByteArray(new StringInputStream(LOREM_IPSUM));
assertArrayEquals(expecteds, actuals);
}
Stacktrace:
堆栈跟踪：
java.lang.AssertionError: array lengths differed, expected.length=56 actual.length=112
at org.junit.Assert.fail(Assert.java:91)
at org.junit.internal.ComparisonCriteria.assertArraysAreSameLength(ComparisonCriteria.java:72)
at org.junit.internal.ComparisonCriteria.arrayEquals(ComparisonCriteria.java:36)
at org.junit.Assert.internalArrayEquals(Assert.java:414)
at org.junit.Assert.assertArrayEquals(Assert.java:200)
at org.junit.Assert.assertArrayEquals(Assert.java:213)
at [...].testInputStreamToByteArray(HttpsTest.java:20)[...]
I do not see why not pass the test. What is wrong?
我不明白为什么不通过测试。怎么了？
采纳答案by Phil K
Specifying the encoding is important.
指定编码很重要。
You haven't provided any encoding for the libraries to work with, and as a result the "default" encoding will be used instead. I'm guessing that since one of your byte arrays is twice the size of the other, one encoding used is UTF-16 and the other UTF-8/ASCII.
您尚未为要使用的库提供任何编码，因此将使用“默认”编码。我猜因为你的一个字节数组的大小是另一个的两倍，所以使用的一种编码是 UTF-16，另一种是 UTF-8/ASCII。
Try this:
试试这个：
public void testInputStreamToByteArray() throws IOException {
byte[] expecteds = LOREM_IPSUM.getBytes("UTF-8");
byte[] actuals = org.apache.commons.io.IOUtils.toByteArray(new StringReader(LOREM_IPSUM), "UTF-8");
assertArrayEquals(expecteds, actuals);
}
