Question

我有一个.txt文件：

80,90,100,110,120,130,140,150,160   
100,20,22,24,26,28,26,28,29,27   
110,30,32,34,36,37,39,37,39,40  
120,40,41,42,44,45,46,48,47,49

表示百叶窗价格的表格，第一行是百叶窗的宽度，第一列没有80是高度。其余的数字是价格。

我已经使用c＃做了这个，但在java中我不知道该怎么做，在c＃我的代码看起来像这样，一切都很好。有人能在java中向我展示同样的东西吗？ theWidth和theHeight是我必须输入尺寸的文本字段。

                string[] lines = File.ReadAllLines(@"tabel.txt");
                string[] aux = lines[0].Split(',');
                for (int i = 0; i < aux.Length-1; i++)
                {
                    if (aux[i] == theWidth.ToString())
                    {
                        Console.WriteLine(aux[i]);
                        indiceLatime = i;
                    }
                }

                for (int i = 1; i < lines.Length; i++)
                {
                    aux = lines[i].Split(',');
                    if (aux[0] == theHeight.ToString())
                    {
                        showPrice.Text = aux[indiceLatime + 1];
                    }
                }

在java中我试过这样的事情：

try {
        BufferedReader inputStream = new BufferedReader(new FileReader("tabel.txt"));
        int theWidth = 90;
        int theHeight = 100;
        int indiceLatime = 0;
        String line;

        try {
            while ((line = inputStream.readLine()) != null) {
                String[] aux = line.split(",");
                for (int i = 0; i < aux.length; i++) {
                    if (aux[i].equals(Integer.toString(theWidth))) {

                        indiceLatime = i;
                    }
                }
                for (int i = 1; i < aux.length; i++) {
                    if (aux[0].equals(Integer.toString(theHeight))) {
                        System.out.println("price: " + aux[indiceLatime]);
                    }
                }
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

所以价格是在Width指数的高位行，我试图以某种方式获得。是否有人可以告诉我如何从行中获得正确的数字（价格）？

Answer 1

您可以像这样使用FileReader：

    try {

        br = new BufferedReader(new FileReader(filePath));
        while ((line = br.readLine()) != null) {

            // code here to handle the current readed line

        }

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (br != null) {
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

<强> [编辑]

关于您的更新，我已编辑您的代码，请检查。

int widthIndex = 90;
    int hightIndex = 100;
    int indiceLatime = 0;
    boolean lookForWidth = true;

    try {
        BufferedReader br = new BufferedReader(new FileReader("table.txt"));
        String line = "";
        while ((line = br.readLine()) != null) {

            String[] aux = line.split(",");

            if(lookForWidth) {// this flag to look for width only at the first time.
                for (int i = 0; i < aux.length; i++) {
                    if(widthIndex == Integer.parseInt(aux[i].trim())) {
                        indiceLatime = i;
                        lookForWidth = false;
                        continue;
                    }
                }
            }

            for (int i = 0; i < aux.length; i++) {
                if(hightIndex == Integer.parseInt(aux[0])) {
                    System.out.println(aux[indiceLatime]);
                    break;
                }
            }
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

Answer 2

试试这样：

public static void main(String[] args) throws FileNotFoundException {
String filePath = <Your file Path>;
    try {
        BufferedReader br = new BufferedReader(new FileReader(filePath ));
        String line = br.readLine();
        System.out.println(line);
        while (line != null || !line.equals(null)) {
            System.out.println(line);
            line=br.readLine();
        }
    } catch (Exception e) {
    }
}

如何从文本文件中获取特定值

2 个答案: