Java 使用openCSV使用新值更新行

我需要使用openCSV实用程序用新值更新一行。例如，我有下面的CSV文件，我需要将包含

TestdminUsername1

和

TestdminUsername2

的行分别更新为

TestdminUsername1，Fail，Errors find

和

TestdminUsername2，Fail，Errors find

TestdminUsername1,Pass,No Error
TestAdminUsername2,Pass,No Error
TestAdminUsername3,Pass,No Error
TestAdminUsername4,Pass,No Error
TestAdminUsername5,Pass,No Error
TestAdminUsername6,Pass,No Error
TestAdminUsername7,Pass,No Error
TestAdminUsername8,Pass,No Error
TestAdminUsername9,Pass,No Error
TestAdminUsername10,Pass,No Error

下面是我使用的一段代码：

import java.io.FileReader;
import java.io.FileWriter;
import java.util.Arrays;

import com.opencsv.CSVReader;
import com.opencsv.CSVWriter;

public class AppendToCSVExample
{
    @SuppressWarnings("resource")
    public static void main(String[] args) throws Exception
   {
      String csv = "D:\\data2.csv";
      CSVWriter writer = new CSVWriter(new FileWriter(csv, true));
      String [] record1 = "TestdminUsername1,Pass,No Error".split(",");
      String [] record2 = "TestAdminUsername2,Pass,No Error".split(",");
      String [] record3 = "TestAdminUsername3,Pass,No Error".split(",");
      String [] record4 = "TestAdminUsername4,Pass,No Error".split(",");
      String [] record5 = "TestAdminUsername5,Pass,No Error".split(",");
      String [] record6 = "TestAdminUsername6,Pass,No Error".split(",");
      String [] record7 = "TestAdminUsername7,Pass,No Error".split(",");
      String [] record8 = "TestAdminUsername8,Pass,No Error".split(",");
      String [] record9 = "TestAdminUsername9,Pass,No Error".split(",");
      String [] record10 = "TestAdminUsername10,Pass,No Error".split(",");

      writer.writeNext(record1);
      writer.writeNext(record2);
      writer.writeNext(record3);
      writer.writeNext(record4);
      writer.writeNext(record5);
      writer.writeNext(record6);
      writer.writeNext(record7);
      writer.writeNext(record8);
      writer.writeNext(record9);
      writer.writeNext(record10);

      writer.close();

      CSVReader reader = new CSVReader(new FileReader("D:\\data1.csv"), ',' , '"' , 1);

      String[] nextLine;
      while ((nextLine = reader.readNext()) != null) {
          if (nextLine != null) {
         //Verifying the read data here
         System.out.println(Arrays.toString(nextLine));
         String[] parts = Arrays.toString(nextLine).split(",");
         if (parts[0].toString().contains("TestdminUsername1")) {
             String [] recordTest = "TestdminUsername1, Fail, Errors found".split(",");
              //Which method in openCSV needs to be used to update recordTest value in the File data2.csv
             ;
         }
      }
    }
  }
}

---

就我个人而言，我建议您打开另一个CSVWriter到一个新文件（data3.csv），并在读取data1时写入data3，更改需要修改的数据。这样，如果由于任何原因失败，您仍然保留原始文件。最后，如果您只需要一个文件，您可以删除data1并将data3.csv重命名为data1.csv

前面有一个问题，有人试图同时读取和写入同一个文件（），但我还是建议在出现错误时不要这样做