java - 读取 p 值的 .csv 文件，如何忽略/转换某些输入？

Question

我正在尝试将包含节点数据(主要是 p 值)的 .csv 文件读入我的程序，但这样做时我必须将它们从字符串转换为 double 。其方法如下:

public ArrayList<Node> getCSVFile(String file){


        String csvFile = file;
        BufferedReader br = null;
        String line = "";
        String cvsSplitBy = ",";
        ArrayList<Node> nL = new ArrayList<Node>();
        int count = 0;

        try {

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

                    // use comma as separator
                String[] node = line.split(cvsSplitBy);


                double pVal = Double.parseDouble(node[4]);
                nL.add(new Node(count, node[0], pVal));

                count++;
            }

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

    return nL;
}

对象 Node 被参数化为 Node(int, String, double)，但我尝试转换的文件的第一行是列名，我不完全确定之后条目的性质。看一下文件的开头:

GENE,COMMON,gal1RGexp,gal4RGexp,gal80Rexp,gal1RGsig,gal4RGsig,gal80Rsig YHR051W,COX6,-0.034,0.111,-0.304,3.75720e-01,1.56240e-02,7.91340e-06 YHR124W,NDT80,-0.090,0.007,-0.348,2.71460e-01,9.64330e-01,3.44760e-01 YKL181W,PRS1,-0.167,-0.233,0.112,6.27120e-03,7.89400e-04,1.44060e-01 YGR072W,UPF3,0.245,-0.471,0.787,4.10450e-04,7.51780e-04,1.37130e-05 YHL020C,OPI1,0.174,-0.015,0.151,1.40160e-04,7.19120e-01,1.53950e-02 YGR145W,YGR145W,0.387,-0.577,-0.088,5.37920e-03,8.27330e-03,7.64180e-01 YGL041C,YGL041C,0.285,-0.086,0.103,4.46050e-04,4.50790e-01,7.03040e-01 YGR218W,CRM1,-0.018,-0.001,-0.018,6.13810e-01,9.79400e-01,8.09690e-01 YOR202W,HIS3,-0.432,-0.710,0.239,1.09790e-02,1.79790e-04,5.48950e-03 YCR005C,CIT2,0.085,0.392,0.464,4.18980e-02,1.53050e-06,2.74360e-06 YER187W,KHS1,0.159,0.139,-0.045,8.51260e-04,4.17830e-03,6.18020e-01 YBR026C,YBR026C,0.276,0.189,0.291,3.63320e-05,6.15230e-04,1.24430e-03 YMR244W,YMR244W,0.078,-0.239,-0.072,5.76050e-01,3.55240e-01,8.85690e-01 Etc etc..

因此，代码根据第一列和第五列以及唯一的计数器为每行创建节点。但是，如何跳过只有列名的第一行？我有点犹豫是否要简单地跳过所有文件中的所有第一行，因为并非所有读取的文件都可能将字符串作为第一行。即使如此，以下行是否适合转换为 double ？

谢谢!

Answer 1

当无法解析 double 时，如何跳过行？ 像这样:

public ArrayList<Node> getCSVFile(String file){
    String csvFile = file;
    BufferedReader br = null;
    String line = "";
    String cvsSplitBy = ",";
    ArrayList<Node> nL = new ArrayList<Node>();
    int count = 0;

    try {

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

                // use comma as separator
            String[] node = line.split(cvsSplitBy);
            double pVal;

            try {
                pVal = Double.parseDouble(node[4]);
            } catch (NumberFormatException e) {
                continue;   // Skip this line if this isn't a double
            }

            nL.add(new Node(count, node[0], pVal));

            count++;
        }

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

    return nL;
}