[英]Java scanner read from csv using delimeter and ignore endline
The code: 编码:
public static void main(String[] args) throws Exception{
Scanner scn = new Scanner(new File ("kektura.csv"));
int kezd = 0;
List <String> indul = new ArrayList<>();
List <String> veg = new ArrayList<>();
List <Double> hossz = new ArrayList<>();
List <Integer> emel = new ArrayList<>();
List <Integer> lejt = new ArrayList<>();
List <Boolean> pecset = new ArrayList<>();
kezd=scn.nextInt();
scn.nextLine();
while(scn.hasNextLine())
{
scn.useDelimiter(";");
indul.add(scn.next());
veg.add(scn.next());
hossz.add(scn.nextDouble());
emel.add(scn.nextInt());
lejt.add(scn.nextInt());
if(scn.next()=="n")
{
pecset.add(Boolean.TRUE);
}
else
{
pecset.add(Boolean.FALSE);
}
scn.nextLine();
}
for(Object x : pecset)
{
System.out.println(x);
}
scn.close();
}
And the file (It's a csv file, it has more lines, but they are the same pattern): 和文件(这是一个csv文件,它具有更多行,但是它们是相同的模式):
192
Sumeg, vasutallomas;Sumeg, buszpalyaudvar;1,208;16;6;n
Sumeg, buszpalyaudvar;Mogyorosi-domb, geologiai bemutatohely;1,512;24;8;n
Mogyorosi-domb, geologiai bemutatohely;Sumegi bazaltbanya vasutallomas;1,576;13;43;n
Sumegi bazaltbanya vasutallomas;Sarvaly erdeszhaz, pecsetelohely;2,101;69;18;i
I have a problem with reading this. 我在阅读本文时遇到了问题。 Read the first line, it's okay.
阅读第一行,没关系。 But the second line isn't good, because (i think) the delimeter reads until the ( ; ) character, but in the end of the line, there's not a ( ; ) .
但是第二行效果不好,因为(我认为)分界符会一直读到(;)字符,但是在行的末尾没有(;)。 The last line of the while, I wrote scn.nextLine to read the \\n character, but it doesn't work.
最后一行,我写了scn.nextLine来读取\\ n字符,但是它不起作用。 I know thats a possible way, to read the line, and split it, but it's a school project, and the teacher told us to find out another solution.
我知道这是一种可行的方法,可以阅读并拆分行,但这是一个学校项目,老师告诉我们要找到其他解决方案。 Is there a way, to solve this?
有办法解决吗?
As your teacher wants you to find another solution, I propose to use a BufferedReader
to read the file in single lines. 由于您的老师希望您找到其他解决方案,因此我建议使用
BufferedReader
来单行读取文件。 For each line you can then use String#split()
and finally convert the respective parts to the required type ( Integer#parseInt()
etc). 然后,对于每一行,您可以使用
String#split()
并最终将各个部分转换为所需的类型( Integer#parseInt()
等)。
However, as this is stated as a homework question, I will not provide a full example. 但是,由于这是家庭作业问题,因此我将不提供完整示例。
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