所以目前我正在运行以下代码来从一个名为Races.txt
的文件中读取import java.util.Scanner;
import java.io.*;
public class FileReader {
public FileReader(){
}
public static void readRaceFile(String filename) throws FileNotFoundException{
Scanner reader = new Scanner(new File(filename));
System.out.println("File found");
int str = 0, dex = 0, con = 0, intl = 0, wis = 0, cha = 0, maxAge = 0, baseSpeed = 0;
String name = "", size = "", description = "";
while(reader.hasNext()){
if(reader.hasNext("Race:")){
reader.skip("Race:");
reader.useDelimiter("\\{");
name = reader.next();
reader.skip("\nstr:");
reader.useDelimiter(";");
str = reader.nextInt();
reader.skip(";\ndex:");
dex = reader.nextInt();
reader.skip(";\ncon:");
con = reader.nextInt();
reader.skip(";\nintl:");
intl = reader.nextInt();
reader.skip(";\nwis:");
wis = reader.nextInt();
System.out.println(str + wis + dex + con + intl + cha + maxAge + baseSpeed + name + size + description);
}else if(reader.hasNext("Subrace:")){
}
}
reader.close();
}
public static void main(String args[]){
try{
readRaceFile("Races.txt");
}catch(IOException e){
System.out.println("file not found");
}
}
}
该代码正在读取以下文本文件，其格式与此处显示的相同：
Race:name{
str:0;
dex:0;
con:0;
intl:0;
wis:0;
cha:0;
max age:100;
base speed:35;
size:medium;
description:This is a race;
abilities:Darkvision - You can see in dim light up to 60 feet as if it were bright light, Idiosy - You are stupid;
number of possible tool proficiency choices:0;
possible tool proficiencies:brewer's tools, masonry tools;
number of possible skill proficiency choices:0;
possible skill proficiencies:perception;
number of possible language choices:0;
possible language choices:elvish, dwarf;
given tool proficiencies:martial weapons;
given skill proficiencies:;
given languages:english;
cantrips:
1, fireball
3, plant growth;
}
当我运行程序时，我可以成功跳过“Race：”并导入“name”并打印它，如果我想但是当我尝试使用“\ nstr：”，“str”跳过“str：”时：“，或”{\ nstr：“我收到以下错误：
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.skip(Unknown Source)
at java.util.Scanner.skip(Unknown Source)
at FileReader.readRaceFile(FileReader.java:18)
at FileReader.main(FileReader.java:39)
这是我的第一个Java编码项目之一，我意识到这可能是一个简单的修复，但任何额外的帮助将不胜感激
P.S。我意识到其余的代码在这一点上是不完整的，但我正在测试它以确保扫描程序能够工作，这样我就可以创建另一个我一直在研究的对象。谢谢！
答案 0 :(得分：0)
这不是阅读此文件的完美方式。无论如何请检查以下代码是否适合您。
public static void readRaceFile(String filename) throws FileNotFoundException{
Scanner reader = new Scanner(new File(filename));
System.out.println("File found");
int str = 0, dex = 0, con = 0, intl = 0, wis = 0, cha = 0, maxAge = 0, baseSpeed = 0;
String name = "", size = "", description = "";
while(reader.hasNext()){
if(reader.hasNext("Race:")){
reader.skip("Race:");
reader.useDelimiter("\\{");
name = reader.next();
reader.nextLine();
reader.skip("str:");
reader.useDelimiter(";");
str = reader.nextInt();
reader.nextLine();
reader.skip("dex:");
dex = reader.nextInt();
reader.nextLine();
reader.skip("con:");
con = reader.nextInt();
reader.nextLine();
reader.skip("intl:");
intl = reader.nextInt();
reader.nextLine();
reader.skip("wis:");
wis = reader.nextInt();
System.out.println(str + wis + dex + con + intl + cha + maxAge + baseSpeed + name + size + description);
}else if(reader.hasNext("Subrace:")){
}
}
reader.close();
}
由于你是一个新手，请尝试阅读你自己的正则表达式模式匹配，以避免扫描仪的这种跳过（模式）。
您可以将文件读入字符串，也可以逐行读取或使用分隔符读取。然后应用你的逻辑。而不是得到你的逻辑如何wrtten。这是超级刚性的，一个单一的空白或换行会搞砸了。
例如，您可以逐行阅读并对手头的字符串进行操作，而不是使用扫描仪本身。
public static void readRaceFile(String filename) throws FileNotFoundException{
Scanner reader = new Scanner(new File(filename));
System.out.println("File found");
while(reader.hasNext()){
String line = reader.nextLine();
//Do you work with the 'line' string as you wish.. Split the string
//or applying regex anything you want to get the details in the string.
//System.out.println(reader.nextLine());
}
}
答案 1 :(得分：0)
您应该使用完整的解析器，以便它可以处理更复杂的情况。最好是，如果您能够更改文件格式，则可以使用现有的解析器（例如JSON）。但是，如果您真的想要使用扫描仪，我已经概述了一种适用于您的样本数据集的方法。请注意，当您需要在数据值中包含分隔符时，此方法将会崩溃。
private static final String DELIMITER = "("
+ "\r\n|[\n\r\u2028\u2029\u0085]" // end of line
+ "|;" // semi-colons
+ "|," // commas
+ "|(?<=:)" // match after colon
+ "|(?=\\{|\\})|(?<=\\{|\\})" // match before+after brace
+ ")+"; // one or more
public static void readRaceFile(String filename) throws FileNotFoundException{
try(Scanner reader = new Scanner(new File(filename))) {
reader.useDelimiter(DELIMITER);
while(reader.hasNext()){
String s = reader.next();
if(s.equals("{")) {
System.out.println("{start block}");
} else if(s.equals("}")) {
System.out.println("{end block}");
} else if(s.endsWith(":")) {
s = s.substring(0, s.length()-1);
System.out.println("attribute: " + s);
} else {
s = s.trim();
System.out.println("\tvalue: " + s);
}
}
}
}
<强>输出：
attribute: Race
value: name
{start block}
attribute: str
value: 0
attribute: dex
value: 0
attribute: con
value: 0
attribute: intl
value: 0
attribute: wis
value: 0
attribute: cha
value: 0
attribute: max age
value: 100
attribute: base speed
value: 35
attribute: size
value: medium
attribute: description
value: This is a race
attribute: abilities
value: Darkvision - You can see in dim light up to 60 feet as if it were bright light
value: Idiosy - You are stupid
attribute: number of possible tool proficiency choices
value: 0
attribute: possible tool proficiencies
value: brewer's tools
value: masonry tools
attribute: number of possible skill proficiency choices
value: 0
attribute: possible skill proficiencies
value: perception
attribute: number of possible language choices
value: 0
attribute: possible language choices
value: elvish
value: dwarf
attribute: given tool proficiencies
value: martial weapons
attribute: given skill proficiencies
attribute: given languages
value: english
attribute: cantrips
value: 1
value: fireball
value: 3
value: plant growth
{end block}