Java将所有名称写入csv文件

Question

• csv 文件 (test.csv)
  姓名|性别
  阿里|M
  阿布|M
  艾哈迈德|M
  西蒂|F
  拉朱|M
  

• 属性文件 (config.properties)
  传入文件名 = test.csv
  OuputFileNameExtension = txt

• test1.java

  public class test1 {
  
  public static Properties prop1 = new Properties(); 
  
  public static String nameList;
  
  public test1() throws FileNotFoundException, IOException{
      InputStream input1 = new FileInputStream("config.properties");
      configProp.load(input1);
  }
  
  public static void main(String[] args) throws IOException {  
      test1 t1 = new test1();
      t1.readFileLength(configProp.getProperty("IncomingFileName"));   
  }
  
  public void readFileLength(String filename){
  
  File file = new File(filename);
  
  try(Scanner scanner = new Scanner(file)){
  
      int j = 1;
  
      while (scanner.hasNextLine()) {
  
          String line = scanner.nextLine() + " ";
  
          if (j != 1) {
  
              String[] records = line.split("\\|");
              String name = records[0];
              String gender = records[1];
  
              nameList = name;
          }
          j++;
      }
  
      if(j != 0){
  
              writeFile("file."+configProp.getProperty
              ("OutputFileNameExtension"),  nameList);
      }
  
      scanner.close();
  
  }catch(IOException x){
  }
  
  public void writeFile(String fileName, String nameList) throws IOException{
  
      File file = new File(fileName);
      FileWriter fileWriter = new FileWriter(file);
  
      System.out.println(nameList); //show one name only
  
      fileWriter.flush();
      fileWriter.close();
  }
  

• 从上面的代码中，我想把所有的名字都写到csv文件中。但是，我只能显示 1 个名称。 (即阿里)。我如何显示所有csv 文件中的名称？

Answer 1

创建名称的链表:替换String nameList;与 LinkedList<String> names = new LinkedList<>();

将每个名称添加到列表中:替换 nameList = name;与 names.add(records[0]);

然后将名称添加到新文件中:

public void writeFile(String fileName, List<String> names) throws IOException{

File file = new File(fileName);
FileWriter fileWriter = new FileWriter(file);
for(String name: names){
    filewriter.write(name);//writes the current name to the file. you may need to add a /n or a "," to the name to get approprite line seperations and comas
}

fileWriter.flush();
fileWriter.close();
}