java - 如何在 Java 中将 List 转换为不带 ""的逗号分隔字符串

Question

我试图在阅读后从 CSV 文件中删除第一行。代码工作正常，但在重写时它在我的数据中添加了“”。举个例子:

• 写入 csv 文件之前:100,COMRADE,CAMPBELL

• 写入 csv 文件后:“100”、“COMRADE”、“CAMPBELL”

  这是代码。

================================================== =========================

public void deleteLineFromCsv() throws IOException {
        List<PatientsTabData> list = new ArrayList<>();
        BufferedReader reader = new BufferedReader(new FileReader(new File("src/main/resources/patients.csv")));
        String line = reader.readLine();
        while(line != null) {
            String[] split = line.split(",");
            list.add(new PatientsTabData().patientId(Integer.parseInt(split[0])).patName(split[1]).patLastName(split[2]));
            line = reader.readLine();
        }
        list.remove(0);
        CSVWriter writer = new CSVWriter(new FileWriter(new File("src/main/resources/patients.csv")));
        List<String[]> newlist = list.stream().map(item -> new String[]
                {String.valueOf(item.getPatientId()), item.getPatName(), item.getPatLastName()})
                .collect(Collectors.toList());
        writer.writeAll(newlist);
        writer.close();
    }

Library:

        <dependency>
            <groupId>net.sf.opencsv</groupId>
            <artifactId>opencsv</artifactId>
            <version>2.3</version>
        </dependency>

Answer 1

您可以在创建编写器时使用另一个构造函数。改变

CSVWriter writer = new CSVWriter(new FileWriter(new File("src/main/resources/patients.csv")));

到

CSVWriter writer = new CSVWriter(new FileWriter(new File("src/main/resources/patients.csv")),',',CSVWriter.NO_QUOTE_CHARACTER);