用Java对CSV文件进行读写操作

Posted 2020-10-20 Etoiles

需要jar包：javacsv-2.0.jar

读操作

// 读取csv文件的内容
    public static ArrayList<String> readCsv(String filepath) {
        File csv = new File(filepath); // CSV文件路径
        csv.setReadable(true);//设置可读
        csv.setWritable(true);//设置可写
        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) // 读取到的内容给line变量
            {
                everyLine = line;
                System.out.println(everyLine);
                allString.add(everyLine);
            }
            System.out.println("csv表格中所有行数：" + allString.size());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return allString;
        
    }

写操作

public void writeCSV(String path) {
        String csvFilePath = path;
        
        try {
            
            // 创建CSV写对象 例如:CsvWriter(文件路径，分隔符，编码格式);
            CsvWriter csvWriter = new CsvWriter(csvFilePath, ‘,‘, Charset.forName("GBK"));
            // 写内容
            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文件已经写入--------");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }