ChannelBufferInputStream responseStream = (ChannelBufferInputStream) response.getBodyAsStream();
ArrayList<Byte> arrayList = new ArrayList<Byte>();
try {
while (responseStream.available() > 0) {
arrayList.add(responseStream.readByte());
}
} catch (IOException e) {
e.printStackTrace();
return internalServerError();
}
Iterator<Byte> iterator = arrayList.iterator();
byte[] bytes = new byte[arrayList.size()];
int i = 0;
while (iterator.hasNext()) {
bytes[i++] = iterator.next();
}
我的網頁應用程序的每一頁加載都會調用此代碼。它似乎運行得非常快,但有什麼可以讓這個運行速度更快嗎?編輯將InputStream轉換爲byte []的最有效方法?
- 使用字節數組輸出流
ChannelBufferInputStream responseStream = (ChannelBufferInputStream) response.getBodyAsStream();
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try {
int read = responseStream.read();
while (read != -1) {
byteArrayOutputStream.write(read);
read = responseStream.read();
}
} catch (IOException e) {
e.printStackTrace();
return internalServerError();
}
byte[] bytes = byteArrayOutputStream.toByteArray();
return ok(bytes).as(response.getHeader("Content-type"));
編輯更新時間 - 基準測試代碼
平均時間後
ChannelBufferInputStream responseStream = (ChannelBufferInputStream) response.getBodyAsStream();
long t1 = System.nanoTime();
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try {
int read = responseStream.read();
while (read != -1) {
byteArrayOutputStream.write(read);
read = responseStream.read();
}
} catch (IOException e) {
e.printStackTrace();
return internalServerError();
}
byte[] bytes = byteArrayOutputStream.toByteArray();
long t2 = System.nanoTime();
System.out.println(t2-t1);
return ok(bytes).as(response.getHeader("Content-type"));
100+請求 - 46873
平均時間100之後
ChannelBufferInputStream responseStream = (ChannelBufferInputStream) response.getBodyAsStream();
long t1 = System.nanoTime();
ArrayList<Byte> arrayList = new ArrayList<Byte>();
try {
while (responseStream.available() > 0) {
arrayList.add(responseStream.readByte());
}
} catch (IOException e) {
e.printStackTrace();
return internalServerError();
}
Iterator<Byte> iterator = arrayList.iterator();
byte[] bytes = new byte[arrayList.size()];
int i = 0;
while (iterator.hasNext()) {
bytes[i++] = iterator.next();
}
long t2 = System.nanoTime();
System.out.println(t2-t1);
return ok(bytes).as(response.getHeader("Content-type"));
+請求 - 522848
平均時間後
long t1 = System.nanoTime();
byte[] bytes;
try {
bytes = org.apache.commons.io.IOUtils.toByteArray(responseStream);
} catch (Exception e) {
return internalServerError();
}
long t2 = System.nanoTime();
System.out.println(t2-t1);
100+請求 - 45088的平均時間之後100+請求
long t1 = System.nanoTime();
byte[] bytes;
try {
bytes = sun.misc.IOUtils.readFully(responseStream, -1, true);
} catch (Exception e) {
return internalServerError();
}
long t2 = System.nanoTime();
System.out.println(t2 - t1);
- 20180
嘿馬特,我讀過那篇文章。我正在尋找最大的效率。 – sissonb 2013-04-22 21:28:16
如果你關心它,你應該自己測量和比較不同的實現。然而,既然你說「看起來運行得很快」,如果你想讓你的代碼運行得更快,這並不會像瓶頸一樣。 – 2013-04-22 21:30:31
看看這個http://stackoverflow.com/questions/6649100/cast-wrapper-array-to-corresponding-primitive-array – 2013-04-22 21:31:01