在java中读取CSV

Question

我无法从CSV文件中读取数据

final String DELIMITER = ",";
    Scanner fileScan = null;
    Scanner dataSetScan = null;
    String dataSet = null;
    String sql = "";
    File users = new File("user.txt");
    String nickname = "";
    String lastname = "";
    String firstname = "";
    String cartype = "";
    String personimage = "";
    String carimage = "";
    int user_id = 0;

    try {
        fileScan = new Scanner(users);
    } catch (Exception e) {
        System.out.println(e);
    }

while(fileScan.hasNext()){
        dataSet = fileScan.nextLine();
        dataSetScan = new Scanner(dataSet);
        dataSetScan.useDelimiter(DELIMITER);

        nickname = dataSetScan.next();
        lastname = dataSetScan.next();
        firstname = dataSetScan.next();
        cartype = dataSetScan.next();
        personimage = dataSetScan.next();
        carimage = dataSetScan.next();

        sql += "INSERT INTO users VALUES (";
        sql += user_id++ + ", ";
        sql += "'" + nickname + "', ";
        sql += "'" + lastname + "', ";
        sql += "'" + firstname + "', ";
        sql += "'" + cartype + "', ";
        sql += "'" + personimage + "', ";
        sql += "'" + carimage + "' ";
        sql += ");\n";

    }

上面的代码不适用于示例文件

alice,Wonder-Land,Alice,red Vauxhall Corsa,alice.jpg,alice_car.jpg
bob,Kett,Robert,,,
charlie,Carlos,Don,,,

但是,当行末有逗号时,它可以正常工作.(在这里逗号不是一个选项)

我能做些什么来完成这项工作？我认为必须与我的外围人员有关

谢谢

Answer 1

我不建议您使用自己的CSV解析器.CSV非常复杂,到处都是小问题.

例如,在CSV中,引用带有逗号的列值是合法的

此文件中有3列

abc,"value1,value2",def

我推荐这个java库,它很容易使用.

http://opencsv.sourceforge.net/

编辑 - 2013年5月

自写这篇文章以来,我已经切换到这个库,它更好地支持CSV"标准"并且正在积极开发.

http://supercsv.sourceforge.net/