Java - 使用 InputStream 读取行
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Java - Read line using InputStream
提问by Ahmad Naoum
I use InputStream to read some data, so I want to read characters until new line or '\n'.
我使用 InputStream 读取一些数据，所以我想读取字符直到换行或 '\n'。
采纳答案by Tommaso Pasini
You should use BufferedReaderwith FileInputStreamReaderif your read from a file
如果您从文件中读取，您应该使用BufferedReaderwithFileInputStreamReader
BufferedReader reader = new BufferedReader(new FileInputStreamReader(pathToFile));
or with InputStreamReaderif you read from any other InputStream
或者InputStreamReader如果你从任何其他人那里读到InputStream
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
Then use its readLine() method in a loop
然后在循环中使用它的 readLine() 方法
while(reader.ready()) {
String line = reader.readLine();
}
But if you really love InputStream then you can use a loop like this
但是如果你真的喜欢 InputStream 那么你可以使用这样的循环
InputStream stream;
char c;
String s = "";
do {
c = stream.read();
if (c == '\n')
break;
s += c + "";
} while (c != -1);
回答by Rana
For files, the following will let you read each line:
对于文件，以下内容将让您阅读每一行：
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.io.File;
public static void readText throws FileNotFoundException(){
Scanner scan = new Scanner(new File("filename.txt"));
while(scan.hasNextLine()){
String line = scan.nextLine();
}
}
回答by Memin
It is possible to read input stream with BufferedReader and with Scanner. If you don't have a good reason,it is better to use BufferedRead (for broad discussion BufferedReader vs Scanner see.
可以使用 BufferedReader 和 Scanner 读取输入流。如果没有充分的理由，最好使用 BufferedRead（有关 BufferedReader 与 Scanner 的广泛讨论，请参阅.
I would also suggest using the Buffered Reader with try-with-resources to make sure the resource are auto-closed. see
我还建议将 Buffered Reader 与 try-with-resources 一起使用，以确保资源自动关闭。看
See the following code
看下面的代码
try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
while (reader.ready()) {
String line = reader.readLine();
System.out.println(line);
}
}catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
