需要jar包：javacsv-2.0.jar

讀操作

// 讀取csv文件的內容
    public static ArrayList<String> readCsv(String filepath) {
        File csv = new File(filepath); // CSV文件路徑
        csv.setReadable(true);//設置可讀
        csv.setWritable(true);//設置可寫
        BufferedReader br = null;
        try {
            br = new BufferedReader(new
 
 FileReader(csv));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        String line = "";
        String everyLine = "";
        ArrayList<String> allString = new ArrayList<>();
        try {
            while ((line = br.readLine()) != null) // 讀取到的內容給line變量
 

            {
                everyLine = line;
                System.out.println(everyLine);
                allString.add(everyLine);
            }
            System.out.println("csv表格中所有行數：" + allString.size());
        } catch (IOException e) {
            e.printStackTrace();
        }
        
 
return allString;
        
    }

寫操作

public void writeCSV(String path) {
        String csvFilePath = path;
        
        try {
            
            // 創建CSV寫對象 例如:CsvWriter(文件路徑，分隔符，編碼格式);
            CsvWriter csvWriter = new CsvWriter(csvFilePath, ‘,‘, Charset.forName("GBK"));
            // 寫內容
            String[] headers = {"FileName","FileSize","FileMD5"};
            csvWriter.writeRecord(headers);
            for(int i=0;i<writearraylist.size();i++){
                String[] writeLine=writearraylist.get(i).split(",");
                System.out.println(writeLine);
                csvWriter.writeRecord(writeLine);
            }
                       
            csvWriter.close();
            System.out.println("--------CSV文件已經寫入--------");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

用Java對CSV文件進行讀寫操作