[英]Java http - read large file
I am reading a big file in a Java program, using http access. 我正在使用http访问在Java程序中读取一个大文件。 I read the stream, and then I apply some criteria.
我阅读了流,然后我应用了一些标准。 Would it be possible to apply the criteria on the read stream, so I will have a light result (I'm reading big files)?
是否可以在读取流上应用标准,因此我将得到一个轻量级结果(我正在阅读大文件)?
Here is my code for reading the file: 这是我读取文件的代码:
public String getMyFileContent(URLConnection uc){
String myresult = null;
try {
InputStream is = uc.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
int numCharsRead;
char[] charArray = new char[1024];
StringBuffer sb = new StringBuffer();
while ((numCharsRead = isr.read(charArray)) > 0) {
sb.append(charArray, 0, numCharsRead);
}
myresult = sb.toString();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return result;
}
And in another method, I then apply the criteria (to parse the content). 然后在另一种方法中,我应用标准(解析内容)。 I couldn't achieve to do like this:
我不能这样做:
public String getMyFileContent(URLConnection uc){
String myresult = null;
try {
InputStream is = uc.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
int numCharsRead;
char[] charArray = new char[1024];
StringBuffer sb = new StringBuffer();
while ((numCharsRead = isr.read(charArray)) > 0) {
sb.append(charArray, 0, numCharsRead);
//Apply my criteria here on the stream ??? Is it possible ???
}
myresult = sb.toString();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return myresult;
}
The template I would use is 我将使用的模板是
InputStreamReader isr = new InputStreamReader(uc.getInputStream());
int numCharsRead;
char[] charArray = new char[1024];
while ((numCharsRead = isr.read(charArray)) > 0) {
//Apply my criteria here on the stream
}
however since it is text, this might be more useful 但是因为它是文本,所以这可能更有用
InputStream is = uc.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(uc.getInputStream()));
String line;
while ((line = br.readLine()) != null) {
//Apply my criteria here on each line
}
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