使用openCSV更新一个具有新值的行

我需要使用openCSV实用程序使用新值更新一行。举例来说，我有下面的CSV文件，我需要分别将包含TestdminUsername1和TestdminUsername2的行更新为TestdminUsername1,Fail,Errors Found和TestdminUsername2,Fail,Errors Found。使用openCSV更新一个具有新值的行

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

下面是一段代码我使用：

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 
      ; 
     } 
     } 
    } 
    } 
}

来源

2015-07-13 Arun Shankar

个人而言，我会建议您打开第二个CSVWriter到一个新文件（data3.csv），并为您的数据1读你写信给data3来改变需要修改的数据。这种方式，如果你因任何原因失败，你仍然有你的原始文件。最后，如果只需要一个文件，则可以删除data1并将data3.csv重命名为data1.csv。

以前有人试图在同一时间读取和写入同一个文件（Reading from a CSV file and writing to a new CSV file using openCSV in java），但如果出现错误，我会再次提醒您。

来源

2015-07-13 15:43:06

使用openCSV更新一个具有新值的行

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