Question

更容易做到这一点？

我正在尝试导入四行文件：

name
phone
mobile
address

我正在使用：

public void importContacts() {
    try {
        BufferedReader infoReader = new BufferedReader(new FileReader(
                "../files/example.txt"));
        int i = 0;
        String loadContacts;

        while ((loadContacts = infoReader.readLine()) != null) {
            temp.add(loadContacts);
            i++;
        }

        int a = 0;
        int b = 0;

        for (a = 0, b = 0; a < temp.size(); a++, b++) {
            if (b == 4) {
                b = 0;
            }

            if (b == 0) {
                Name.add(temp.get(a));
            }

            if (b == 1) {
                Phone.add(temp.get(a));
            }

            if (b == 2) {
                Mobile.add(temp.get(a));
            }

            if (b == 3) {
                Address.add(temp.get(a));
            }
        }
    }

    catch (IOException ioe) {
        JOptionPane.showMessageDialog(null, ioe.getMessage());

    }

    txtName.setText(Name.get(index));
    txtPhone.setText(Phone.get(index));
    txtMobile.setText(Mobile.get(index));
    txtAddress.setText(Address.get(index));

}

是他们更容易的方式吗？看起来很啰嗦！

Answer 1

您可以使用扫描仪类。

Scanner s = new Scanner(new File("input.txt"));
name = s.nextLine();
phone = s.nextLine();
mobile = s.nextLine();
address = s.nextLine();

Answer 2

Apache Fileutils readFileToString（）或readLines（）使代码更加干净。

    import org.apache.commons.io.FileUtils;

    ...


    File file = new File("foobar.txt");

    try
    {
        List<String> data = FileUtils.readLines(file);

        // Iterate the result to print each line of the file.
        Iterator<String> iter = data.iterator();
        while(iter.hasNext()) {
            Name.add(iter.next());
            if (iter.hasNext()) {
                Phone.add(iter.next());
            }
            if (iter.hasNext()) {
                Mobile.add(iter.next());
            }
            if (iter.hasNext()) {
                Address.add(iter.next());
            }
        }

    } catch (IOException e)
    {
        e.printStackTrace();
    }

通过使用像

这样的结构，你甚至可以缩短它

if (iter.hasNext()) Phone.add(iter.next());

但我个人认为丢弃大括号会使代码更容易出错。不过，你可以把它放在一行上。

Answer 3

创建表示您的数据集的数据对象。使用新对象，接受一个字符串并在新对象中本地解析它。

Driver Class: 
  readInFromFile 

EntityClass
  EntityClass(String) < calls the parse method
  get[data elements]
  parseFromString(String info) <- this is responsible for all of your reading

“readFromFile”方法将变为：

....
while ((String line= reader.readLine) != null) {
   list.add(new Entity(line));
}

Answer 4

BufferedReader infoReader = new BufferedReader(new FileReader("../files/example.txt"));

    String loadContacts;
    List<People> list = new ArrayList<People>();

    while ((loadContacts = infoReader.readLine()) != null) {
        String[] singleContact = loadContacts.split(REGEXP_FOR_SPLIT_VALUES);
        People p = new People();
        p.setName(singleContact[0]);
        p.setPhone(singleContact[1]);
        p.setMobile(singleContact[2]);
        p.setAddress(singleContact[3]);
        list.add(p);
    }

Answer 5

这个怎么样？

while(infoReader.hasNext()) {
  Name.add(infoReader.readLine());
  Phone.add(infoReader.readLine());
  Mobile.add(infoReader.readLine());
  Address.add(infoReader.readLine());
}

虽然我更喜欢将Name，Phone等类更改为代表一个联系人的一个类。

Answer 6

以下是我将如何操作，使用新的Scanner类轻松读取并处理IOExceptions，使用ClassLoader查找文件，并使用简单的@Data类来存储数据。

public void importContacts() {
    Scanner scanner = new Scanner(ClassLoader.getSystemClassLoader().getResourceAsStream("example.txt"));
    List<Contact> list = Lists.newArrayList();
    while(scanner.hasNext()) {
        list.add(new Contact(
            scanner.nextLine(),
            scanner.nextLine(),
            scanner.nextLine(),
            scanner.nextLine()
        ));
    }

    Contact c = list.get(index);
    txtName.setText(c.getName());
    txtAddress.setText(c.getAddress());
    txtPhone.setText(c.getPhone());
    txtMobile.setText(c.getMobile());
}

private static @Data class Contact {
    private final String name, phone, mobile, address;
}

Answer 7

如果文件只包含一个联系人，并且您可以控制源文本文件的格式，则可以将其重新格式化为属性文件：

name=value

然后你将其作为属性文件阅读（参见ResourceBundle），最终变得简单：

Mobile.add(properties.getProperty("mobile"))

Answer 8

为什么不呢：

public String readLine(BufferedReader pReader) {
    try {
        return pReader.readLine();
    } catch(IOException IOE) {
        /* Not a very good practice but let say "We don't care!" */
        // Return null if the line is not there (like there was no 4 lines in the file)
        return null;
    }
}

public void importContacts() {
    try {
        BufferedReader infoReader = new BufferedReader(new FileReader("../files/example.txt"));
        txtName   .setText(readLine(infoReader));
        txtPhone  .setText(readLine(infoReader));
        txtMobile .setText(readLine(infoReader));
        txtAddress.setText(readLine(infoReader));
    } catch (IOException ioe) {
        JOptionPane.showMessageDialog(null, ioe.getMessage());
    }
}

希望这有帮助。

导入文本文件

8 个答案: