使用 Java 写入文本文件会被缩短

Posted 2023-05-07

【中文标题】使用 Java 写入文本文件会被缩短

【英文标题】：Writing to a text file using Java gets cut short

【发布时间】：2012-10-09 16:40:11

【问题描述】：

我有一个程序从一个用逗号分隔的文本文件（目前为 653 行）读取。但是当我将文件保存到新位置时，它只保存了 490 行。新创建的文本文件中的最后一行似乎也被切成了两半。关于可能是什么问题的任何想法？

这是我用来打开列表中的数据并对其进行排序的代码：

try 
    scanner = new Scanner(file);

    // Put the database into an array and 
    // Make sure each String array is 13 in length
    while (scanner.hasNext()) 
        line = scanner.nextLine();
        word = line.split(",");

        if (word.length < 13) 
            String[] word2 = "","","","","","","","","","","","","";
            for (int i = 0; i < word.length; i++) 
                word2[i] = word[i];
            
            dataBaseArray.add(word2);
        
        else 
            dataBaseArray.add(word);
        
    

catch (FileNotFoundException exc) 
    JOptionPane.showMessageDialog(this, "File cannot be found.", "error finding file", JOptionPane.ERROR_MESSAGE);


// Splitting the database into vacant numbers/dead lines/vacant cubicles
for (int i = 0; i < dataBaseArray.size(); i++) 
    if (dataBaseArray.get(i)[8].equals("VACANT")) 
        vacantNums.add(dataBaseArray.get(i));
    
    else if (dataBaseArray.get(i)[4].equals("DEAD")) 
        deadLines.add(dataBaseArray.get(i));
    
    else if (dataBaseArray.get(i)[6].equals("") && dataBaseArray.get(i)[7].equals("")) 
        vacantCubs.add(dataBaseArray.get(i));
    
    else if (dataBaseArray.get(i)[7].equals("")) 
        people.add(dataBaseArray.get(i));
    
    else 
        people.add(dataBaseArray.get(i));
    


// Resetting the DB Array to put the values back in it
dataBaseArray = new ArrayList<>();

// Ordering the arrays I want them to appear in the list
// Orering the people to appear in alphabetical order
Collections.sort(people, new Comparator<String[]>() 

    @Override
    public int compare(String[] strings, String[] otherStrings) 
        return strings[7].compareTo(otherStrings[7]);
    
);

// Put the people in the DB Array
for (int i = 0; i < people.size(); i++) 
    dataBaseArray.add(people.get(i));


// Put the vacant numbers in the AB Array
for (int i = 0; i < vacantNums.size(); i++) 
    dataBaseArray.add(vacantNums.get(i));


// Put the vacant cubicles in the AB Array
for (int i = 0; i < vacantCubs.size(); i++) 
    dataBaseArray.add(vacantCubs.get(i));


// Put the dead lines in the AB Array
for (int i = 0; i < deadLines.size(); i++) 
    dataBaseArray.add(deadLines.get(i));


list = new String[dataBaseArray.size()];

// Add the DB Array to the list
for (int i = 0; i < list.length; i++) 
    if (dataBaseArray.get(i)[8].equals("VACANT")) 
        list[i] = "VACANT";
    
    else if (dataBaseArray.get(i)[4].equals("DEAD")) 
        list[i] = "DEAD";
    
    else if (dataBaseArray.get(i)[6].equals("") && dataBaseArray.get(i)[7].equals("")) 
        list[i] = "Vacant Cubicle";
    
    else if (dataBaseArray.get(i)[7].equals("")) 
        list[i] = dataBaseArray.get(i)[6];
    
    else 
        list[i] = dataBaseArray.get(i)[7] + ", " + dataBaseArray.get(i)[6];
    


// Populate the list
lstAdvance.setListData(list);

这是我用来保存文件的内容：

try 
    saveFile = new FileWriter("Save Location");
    String newLine = System.getProperty("line.separator");

    for (int i = 0; i < dataBaseArray.size(); i++) 
        for (int j = 0; j < dataBaseArray.get(i).length; j++) 
            saveFile.append(dataBaseArray.get(i)[j] + ",");
        
        saveFile.append(newLine);
    

catch (IOException exc) 
    JOptionPane.showMessageDialog(this,"error", "error", JOptionPane.ERROR_MESSAGE);

【参考方案1】：

写入文件被缓冲。你必须在写作结束时close() 或flush() 你的作家（saveFile）。

更好的是：您应该在finally 块中对您的作家执行close()。

【参考方案2】：

尝试使用FileWriter 和BufferedWriter....

File f = new File("Your_Path");

FileWriter fw = new FileWriter(f);

BufferedWriter bw = new BufferedWriter(fw);

是的..这样做非常重要bw.close() （关闭缓冲区）

【参考方案3】：

看到这个问题：Java FileWriter with append mode

问题是你的 FileWriter 对象需要是 "append mode" 。然后，您使用“write”方法而不是“append”方法附加到文件。使用 finally catch 子句调用 "close" 。你不需要冲洗（我不认为）。