java 将文本文件逐行读入字符串
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Read a text file line by line into strings
提问by Cardinal - Reinstate Monica
How do I read the contents of a text file line by line into Stringwithout using a BufferedReader?
如何在String不使用BufferedReader? 的情况下逐行读取文本文件的内容？
For example, I have a text file that looks like this inside:
例如，我有一个文本文件，里面看起来像这样：
Purlplemonkeys
greenGorilla
I would want to create two strings, then use something like this
我想创建两个strings，然后使用这样的东西
File file = new File(System.getProperty("user.dir") + "\Textfile.txt");
String str = new String(file.nextLine());
String str2 = new String(file.nextLine());
That way it assigns strthe value of "Purlplemonkeys", and str2the value of "greenGorilla".
这样它就分配str了 的值"Purlplemonkeys"和str2的值"greenGorilla"。
回答by Rustam
You can read text file to list:
您可以读取文本文件以列出：
List<String> lst = Files.readAllLines(Paths.get("C:\test.txt"));
and then access each line as you want
然后根据需要访问每一行
P.S. Files - java.nio.file.Files
PS 文件 - java.nio.file.Files
回答by Kevin Mee
You should use an ArrayList.
你应该使用一个ArrayList.
File file = new File(fileName);
Scanner input = new Scanner(file);
List<String> list = new ArrayList<String>();
while (input.hasNextLine()) {
list.add(input.nextLine());
}
Then you can access to one specific element of your list from its index as next:
然后，您可以从其索引访问列表中的一个特定元素，如下所示：
System.out.println(list.get(0));
which will give you the first line (ie: Purlplemonkeys)
这会给你第一行（即：Purlplemonkeys）
回答by Viktor Mellgren
If you use Java 7 or later
如果您使用 Java 7 或更高版本
List<String> lines = Files.readAllLines(new File(fileName));
for(String line : lines){
// Do whatever you want
System.out.println(line);
}
回答by Paulius Matulionis
Sinse JDK 7 is quite easy to read a file into lines:
Sinse JDK 7 很容易将文件读入行：
List<String> lines = Files.readAllLines(new File("text.txt").toPath())
String p1 = lines.get(0);
String p2 = lines.get(1);
回答by mcacorner
You can use apache.commons.io.LineIterator
您可以使用 apache.commons.io.LineIterator
LineIterator it = FileUtils.lineIterator(file, "UTF-8");
try {
while (it.hasNext()) {
String line = it.nextLine();
// do something with line
}
} finally {
it.close();
}
One can also validate line by overriding boolean isValidLine(String line)method.
refer doc
还可以通过覆盖boolean isValidLine(String line)方法验证行。
参考文档
回答by Jan
How about using commons-io:
如何使用commons-io：
List<String> lines = org.apache.commons.io.IOUtils.readLines(new FileReader(file));
//Direct access if enough lines read
if(lines.size() > 2) {
String line1 = lines.get(0);
String line2 = lines.get(1);
}
//Iterate over all lines
for(String line : lines) {
//Do something with lines
}
//Using Lambdas
list.forEach(line -> {
//Do something with line
});
回答by Rehman
File file = new File(fileName);
Scanner input = new Scanner(file);
while (input.hasNextLine()) {
System.out.println(input.nextLine());
}
