blocks|key|4439355|text|对于文件，下面的代码将允许您读取每一行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4439356|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();

+++++}
}|code-block|syntax|javascript|4439357|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For files, the following will let you read each line:

<pre><code>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();

 }
}
</code></pre>

blocks|key|4439379|text|如果从文件中读取数据，则应将BufferedReader与FileInputStreamReader一起使用|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4439380|BufferedReader+reader+=+new+BufferedReader(new+FileInputStreamReader(pathToFile));|code-block|syntax|javascript|4439381|或者，如果您从任何其他InputStream读取，也可以使用InputStreamReader|4439382|BufferedReader+reader+=+new+BufferedReader(new+InputStreamReader(inputStream));|4439383|然后在循环中使用它的readLine()方法|4439384|while(reader.ready())+{
+++++String+line+=+reader.readLine();
}|4439385|但是如果您真的喜欢InputStream，那么可以使用下面这样的循环|4439386|InputStream+stream;+
char+c;+
String+s+=+"";+
do+{
+++c+=+stream.read();+
+++if+(c+==+'\n')
++++++break;+
+++s+%2B=+c+%2B+"";
}+while+(c+!=+-1);|4439387|entityMap^0|E|E|T|L|0|0|B|B|U|H|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1A|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1C|8|@]|D|@]|E|$]]|$1|U|3|V|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|W|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|X|$]]

You should use <code>BufferedReader</code> with <code>FileInputStreamReader</code> if your read from a file

<pre><code>BufferedReader reader = new BufferedReader(new FileInputStreamReader(pathToFile));
</code></pre>

or with <code>InputStreamReader</code> if you read from any other <code>InputStream</code>

<pre><code>BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
</code></pre>

Then use its readLine() method in a loop 

<pre><code>while(reader.ready()) {
 String line = reader.readLine();
}
</code></pre>

But if you really love InputStream then you can use a loop like this 

<pre><code>InputStream stream; 
char c; 
String s = ""; 
do {
 c = stream.read(); 
 if (c == '\n')
 break; 
 s += c + "";
} while (c != -1);
</code></pre>

blocks|key|4439406|text|可以使用BufferedReader和扫描仪读取输入流。如果你没有很好的理由，最好使用BufferedRead+(广泛讨论BufferedReader与扫描仪see。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4439407|我还建议使用带有try-+with+-resources的Buffered+Reader，以确保资源是自动关闭的。see|4439408|请参阅以下代码|4439409|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();
++++}|code-block|syntax|javascript|4439410|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2231369/scanner-vs-bufferedreader|1|https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html^0|27|3|0|0|1L|3|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]]]

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 <a href="https://stackoverflow.com/questions/2231369/scanner-vs-bufferedreader">see</a>.

I would also suggest using the Buffered Reader with try-with-resources to make sure the resource are auto-closed. <a href="https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html" rel="noreferrer">see</a>

See the following code

<pre><code>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();
 }
</code></pre>

I use InputStream to read some data, so I want to read characters until new line or '\n'.

Java - Read line using InputStream

我使用InputStream读取一些数据，所以我希望读取字符，直到换行符或'\n‘。

问Java -使用InputStream读取行
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