用Java对CSV文件进行读写操作

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();

}

}