Java 中的 readAllLines 字符集
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readAllLines Charset in Java
提问by blimpse
Update: Thanks for the quick responses, everyone. I've resolved the Charset issue, but now something else is happening that I don't understand at all. Here's my code:
更新：感谢大家的快速回复。我已经解决了字符集问题，但现在发生了一些我根本不明白的事情。这是我的代码：
import java.io.*;
import java.nio.file.*;
import java.nio.charset.*;
public class readConvertSeq{
private static String[] getFile(Path file){
String[] fileArray = (String[])Files.readAllLines(file, StandardCharsets.US_ASCII).toArray();
return fileArray;
}
public static void main(String[] args){
String[] test = readConvertSeq.getFile(Paths.get(args[0]));
int i;
for(i = 0; i < test.length; i++){
System.out.println(test[i]);
}
}
}
And here's the error:
这是错误：
readConvertSeq.java:6: error: unreported exception IOException; must be caught or declared to be thrown
String[] fileArray = (String[])Files.readAllLines(file, StandardCharsets.US_ASCII).toArray();
I'm just trying to get an array of strings from a file, and I'm getting really frustrated by Java's pedantry. Here's my code:
我只是想从一个文件中获取一个字符串数组，我对 Java 的迂腐感到非常沮丧。这是我的代码：
import java.io.*;
import java.nio.file.*;
import java.nio.charset.*;
public class readConvertSeq{
private static String[] getFile(Path file){
String[] fileArray = Files.readAllLines(file, Charset("US-ASCII")).toArray();
return fileArray;
}
public static void main(String[] args){
String[] test = readConvertSeq.getFile(Paths.get(args[0]));
int i;
for(i = 0; i < test.length; i++){
System.out.println(test[i]);
}
}
}
It gives me this:
它给了我这个：
readConvertSeq.java:6: error: cannot find symbol
String[] fileArray = Files.readAllLines(file, Charset("US-ASCII")).toArray();
^
symbol: method Charset(String)
location: class readConvertSeq
I'm sure I've made some other mistakes as well, so feel free to give me any advice you can.
我确定我也犯了一些其他错误，所以请随时给我任何建议。
采纳答案by Mateusz Dymczyk
Charset is an abstract class therefore you cannot instantiate it with the newkeyword.
Charset 是一个抽象类，因此您不能使用new关键字实例化它。
To get a charset in Java 1.7 use StandardCharsets.US_ASCII
要在 Java 1.7 中获取字符集，请使用 StandardCharsets.US_ASCII
回答by SudoRahul
You need to make the below changes
您需要进行以下更改
String[] fileArray = (String[]) Files.readAllLines(file.toPath(), Charset.forName("US-ASCII")).toArray();
^^^^^ - Cast required ^^^^ - Get Charset using forName
See the docs of Files.readAllLines(Path, Charset).
回答by Mureinik
Constructors in Java are called with the newoperator, so Charset("US-ASCII")is not a valid statement.
Moreover, Charset's constructor is protected, so you'll have to use the static factory method to create it: Charset.forName("US-ASCII").
Java 中的构造函数是使用new运算符调用的，因此Charset("US-ASCII")不是有效的语句。此外，Charset的构造函数是受保护的，因此您必须使用静态工厂方法来创建它：Charset.forName("US-ASCII")。
回答by A4L
Charsetdoes not have a public constructor so you have to use the static factory method Charset#forName
Charset没有公共构造函数，因此您必须使用静态工厂方法Charset#forName
