如何将整个输入流读到字节数组?
当前回答
我试图编辑@numan的答案,修复了写垃圾数据,但编辑被拒绝。虽然这段简短的代码并不出色,但我看不到其他更好的答案。以下是我认为最有意义的建议:
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024]; // you can configure the buffer size
int length;
while ((length = in.read(buffer)) != -1) out.write(buffer, 0, length); //copy streams
in.close(); // call this in a finally block
byte[] result = out.toByteArray();
ByteArrayOutputStream不需要关闭。为了可读性,省略了一些结构
其他回答
下面的代码
public static byte[] serializeObj(Object obj) throws IOException {
ByteArrayOutputStream baOStream = new ByteArrayOutputStream();
ObjectOutputStream objOStream = new ObjectOutputStream(baOStream);
objOStream.writeObject(obj);
objOStream.flush();
objOStream.close();
return baOStream.toByteArray();
}
OR
BufferedImage img = ...
ByteArrayOutputStream baos = new ByteArrayOutputStream(1000);
ImageIO.write(img, "jpeg", baos);
baos.flush();
byte[] result = baos.toByteArray();
baos.close();
你可以使用Cactoos(我是它的开发者之一):
import org.cactoos.bytes.BytesOf;
byte[] array = new BytesOf(stream).asBytes();
你也可以将流转换为字符串:
import org.cactoos.text.TextOf;
String txt = new TextOf(stream).asString();
asBytes()和asString()方法都会抛出checked Exception。如果你不想捕获它,使用Unchecked*装饰器,例如:
import org.cactoos.bytes.BytesOf;
import org.cactoos.bytes.UncheckedBytes;
byte[] array = new UncheckedBytes(new BytesOf(stream)).asBytes();
public static byte[] getBytesFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] buffer = new byte[0xFFFF];
for (int len = is.read(buffer); len != -1; len = is.read(buffer)) {
os.write(buffer, 0, len);
}
return os.toByteArray();
}
Java 7及以上版本:
import sun.misc.IOUtils;
...
InputStream in = ...;
byte[] buf = IOUtils.readFully(in, -1, false);
另一种情况是在发送请求到服务器并等待响应后,通过流获得正确的字节数组。
/**
* Begin setup TCP connection to PC app
* to open integrate connection between mobile app and pc app (or mobile app)
*/
mSocket = new Socket(IP, port);
// mSocket.setSoTimeout(30000);
DataOutputStream mDos = new DataOutputStream(mSocket.getOutputStream());
String str = "MobileRequest#" + params[0] + "#<EOF>";
mDos.write(str.getBytes());
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
/* Since data are accepted as byte, all of them will be collected in the
following byte array which initialised with accepted data length. */
DataInputStream mDis = new DataInputStream(mSocket.getInputStream());
byte[] data = new byte[mDis.available()];
// Collecting data into byte array
for (int i = 0; i < data.length; i++)
data[i] = mDis.readByte();
// Converting collected data in byte array into String.
String RESPONSE = new String(data);
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