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，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

变化如何：

namelist = name

到

namelist = namelist + " " + name

并且只调用一次 writeFile 方法。

或者您可以将 namelist 声明为 StringBuilder，并使用 append() 方法做同样的事情。

Answer 2

创建名称的链接列表：将 String nameList; 替换为 LinkedList<String> names = new LinkedList<>();

将每个名称添加到列表中：将 nameList = name; 替换为 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();
}

Java 将所有名称写入 csv 文件

Java write all name into csv file

java

csv