Question

我需要一些帮助。我想实现一个代码，希望在其中读取csv文件中的数据。

示例CSV文件（details.csv）：

id，名称，年龄

1，bh，23

2，nit，24

我想在Java中创建这样的方法来读取此CSV，我将工作表名称，列名称和行名称作为参数传递。只要有此组合的匹配项，就会选择相应的数据。

示例：-我想传递details.csv，name和1。我应该将输出作为bh。

您能帮我吗？

我尝试使用以下代码，但返回空值：-

public static String searchCsvLine(String filename, String searchString, String rowname) throws IOException {
    String resultRow = null;
    BufferedReader br = new BufferedReader(new FileReader(filename));

    String line;

        while ( (line = br.readLine()) != null ) {
        String[] values = line.split(",");

        if(values.equals(searchString)) {
            resultRow = line;
            break;
        }
    }
    br.close();
    return resultRow;
}

Answer 1

您应该解析csv文件的第一行以获取列名。

public class Test {

    public static String searchCsvLine(String filename, String columnName, String rowName) throws IOException {
        String resultRow = null;
        BufferedReader br = new BufferedReader(new FileReader(filename));

        // parse first line as column names
        String line = br.readLine();
        String[] columns = line.split(",");
        int columnIndex = -1;
        for (int i = 0; i < columns.length; i++) {
            if (columnName.equals(columns[i])) {
                columnIndex = i;
                break;
            }
        }

        // read lines to match row
        while ((line = br.readLine()) != null) {
            String[] values = line.split(",");
            if (rowName.equals(values[0])) {
                // return value at columnIndex
                resultRow = values[columnIndex];
                break;
            }
        }
        br.close();
        return resultRow;
    }

    public static void main(String[] args) throws IOException {
        String name = searchCsvLine("details.cvs", "name", "1");
        System.out.println("name is " + name);
    }
}

Answer 2

尝试以下方法：

public static String searchCsvLine(String filename, String searchString,String rowname) throws IOException {
        String resultRow = null;
        BufferedReader br = new BufferedReader(new FileReader(filename));
        String line;
        int searchStringIndex=0;
        while ((line = br.readLine()) != null) {
            String[] values = line.split(",");
//get index of searchString
            for (int i = 0; i < values.length; i++) {
                if(values[i].equalsIgnoreCase(searchString)){
                    searchStringIndex=i;
                    break;
                }
            }
//get required rowname  
            for (int i = 0; i < Integer.parseInt(rowname); i++) {
                line=br.readLine();
            }
//split the line found by rowname and get value as per searchString index (given column)    
            values = line.split(",");
            resultRow=values[searchStringIndex];
            break;
        }

        br.close();
        System.out.println(resultRow);
        return resultRow;
    }
}

读取与CSV中的行和列相对应的特定数据

2 个答案: