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;
}</span></pre>

写操作

public void writeCSV(String path) {
        String csvFilePath = path;
        
        try {
        </span><span style="color: #008000">//</span><span style="color: #008000"> 创建CSV写对象 例如:CsvWriter(文件路径，分隔符，编码格式);</span>
        CsvWriter csvWriter = <span style="color: #0000ff">new</span> CsvWriter(csvFilePath, ',', Charset.forName("GBK"<span style="color: #000000">));
        </span><span style="color: #008000">//</span><span style="color: #008000"> 写内容</span>
        String[] headers = {"FileName","FileSize","FileMD5"<span style="color: #000000">};
        csvWriter.writeRecord(headers);
        </span><span style="color: #0000ff">for</span>(<span style="color: #0000ff">int</span> i=0;i&lt;writearraylist.size();i++<span style="color: #000000">){
            String[] writeLine</span>=writearraylist.get(i).split(","<span style="color: #000000">);
            System.out.println(writeLine);
            csvWriter.writeRecord(writeLine);
        }
                   
        csvWriter.close();
        System.out.println(</span>"--------CSV文件已经写入--------"<span style="color: #000000">);
    } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (IOException e) {
        e.printStackTrace();
    }
}</span></pre>