Question

我需要从.txt文件中读取f_name，l_name，username，密码并将这些信息保存在不同的字符串中。

以下是我逐行读取的代码：

<html>
<head>
<title>My first styled page</title>
</head>
<body>

<script> 
var reader = new FileReader();
reader.onload = function(){
var text = reader.result;
document.querySelector('body').append(text);
};
reader.readAsText(README, "us-ascii");
</script>

<!-- Site navigation menu -->
<ul class="navbar">
<li><a href="alamode-fetch">Alamode</a>
<li><a href="README">Readme</a>
<li><a href="town.html">My town</a>
<li><a href="links.html">Links</a>
</ul>

<!-- Main content -->
<h1>My first styled page</h1>
<p>Welcome to my styled page!
<p>It lacks images, but at least it has style.And it has links, even if they     don't go anywhere&hellip;
<p>There should be more here, but I don't know what yet.
<!-- Sign and date the page, it's only polite! -->
<address>Made 5 April 2004<br>
  by myself.
</address>
</body>
</html>

但我不知道如何将每个名字保存在变量f_name中，变量l_name中的每个姓氏，... 这个f_name，l_name，username，password中的每一个都在文件的新行中。

包含数据的文件示例：

import java.io.*;

public class Users {

 public static void main(String[] args) {
  try {
   File file = new File("users.txt");
   FileReader fileReader = new FileReader(file);
   BufferedReader bufferedReader = new BufferedReader(fileReader);
   StringBuffer stringBuffer = new StringBuffer();
   String line;
   while ((line = bufferedReader.readLine()) != null) {
    stringBuffer.append(line);
    stringBuffer.append("\n");
   }
   fileReader.close();
   System.out.println("Contents of file:");
   System.out.println(stringBuffer.toString());
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}

Answer 1

此f_name，l_name，username，password中的每一个都在文件的新行中。

您可以像这样一次读取四行

String f_name = bufferedReader.readLine();
String l_name = bufferedReader.readLine();
String username = bufferedReader.readLine();
String password = bufferedReader.readLine();

Answer 2

试试这个：

添加以下行：

private BufferedReader innerReader;

并使用此方法：

private List<String> loadFile(Reader reader)
        throws IllegalArgumentException, IOException{
    List<String> fileList = new ArrayList<String>();
    if(reader == null)
    {
        throw new IllegalArgumentException("Reader non valido");
    }
    String line;
    innerReader = new BufferedReader(reader);
    try
    {
    while((line = innerReader.readLine()) != null)
    {
        if (line == null || line.trim().isEmpty())
            throw new IllegalArgumentException(
                    "Line Empty");
        fileList.add(line);
    }
    } catch (IOException e) {
        throw new IOException(e);
    }
    return fileList;
}

然后在主要：

MyClass myClass = new MyClass();
List<String> myList = new ArrayList<String>();
    try {
            myList = myClass.loadFile(new FileReader("YourFile.txt"));
    } catch (IllegalArgumentException | IOException e) {
        e.printStackTrace();
    }
    for(String s : myList)
    {
        System.out.println(s);
    }
    try {
        myClass.innerReader.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

输出：

约翰

约翰逊

约翰尼拉

1234

大卫

戴维森

戴维

1234

逐行读取文件并保存在不同的字符串中

2 个答案: