[英]How do I read bytes from InputStream?
I want to test that the bytes I write to OutputStream
(a file OuputStream) is same as I read from same InputStream
. 我想测试我写入
OutputStream
(文件OuputStream)的字节与我从同一个InputStream
读取的字节相同。
Test looks like 测试看起来像
@Test
public void testStreamBytes() throws PersistenceException, IOException, ClassNotFoundException {
String uniqueId = "TestString";
final OutputStream outStream = fileService.getOutputStream(uniqueId);
new ObjectOutputStream(outStream).write(uniqueId.getBytes());
final InputStream inStream = fileService.getInputStream(uniqueId);
}
I realized that InputStream
doesn't have getBytes()
. 我意识到
InputStream
没有getBytes()
。
How can I test something like 我该怎么测试类似的东西
assertEquals(inStream.getBytes(), uniqueId.getBytes())
Thank you 谢谢
试试这个(IOUtils是commons-io)
byte[] bytes = IOUtils.toByteArray(instream);
You could use ByteArrayOutputStream
您可以使用
ByteArrayOutputStream
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[16384];
while ((nRead = inStream.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
and check using: 并检查使用:
assertEquals(buffer.toByteArray(), uniqueId.getBytes());
您可以从inputstream读取并在ByteArrayOutputStream上写入,然后使用toByteArray()方法将其转换为字节数组。
Java doesn't provide exactly what you want, but you could wrap the streams you're using with something like a PrintWriter
and Scanner
: Java并不能提供您想要的内容,但您可以使用
PrintWriter
和Scanner
类的内容包装您正在使用的流:
new PrintWriter(outStream).print(uniqueId);
String readId = new Scanner(inStream).next();
assertEquals(uniqueId, readId);
Why not try something like this? 为什么不尝试这样的事情呢?
@Test
public void testStreamBytes()
throws PersistenceException, IOException, ClassNotFoundException {
final String uniqueId = "TestString";
final byte[] written = uniqueId.getBytes();
final byte[] read = new byte[written.length];
try (final OutputStream outStream = fileService.getOutputStream(uniqueId)) {
outStream.write(written);
}
try (final InputStream inStream = fileService.getInputStream(uniqueId)) {
int rd = 0;
final int n = read.length;
while (rd <= (rd += inStream.read(read, rd, n - rd)))
;
}
assertEquals(written, read);
}
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