将文件列表保存在 .txt 中
我试图将这个字符串与文件列表一起保存到文件中，但它只保存最后一个..这里有什么问题？ :(
public void fileprinter() throws IOException{
File dir = new File("c:");
String[] children = dir.list();
if (children == null) {
} else {
for (int i=0; i<children.length; i++) {
String filename = new StringBuffer().append(children[i]).toString();
System.out.println(filename);
Writer output;
File file = new File("D:/file.txt");
output = new BufferedWriter(new FileWriter(file));
output.write(filename);
output.close();
}
}
}
i trying to save this string with a file list into a file but it only saves the last one.. what is the problem here? :(
public void fileprinter() throws IOException{
File dir = new File("c:");
String[] children = dir.list();
if (children == null) {
} else {
for (int i=0; i<children.length; i++) {
String filename = new StringBuffer().append(children[i]).toString();
System.out.println(filename);
Writer output;
File file = new File("D:/file.txt");
output = new BufferedWriter(new FileWriter(file));
output.write(filename);
output.close();
}
}
}
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评论（1）
您不断地在循环中覆盖同一个文件，因此只有最后一行会“幸存”。
在循环外部打开 BufferedWriter（一次！）并在完成后将其关闭。
另一种方法是以附加模式打开，但即使如此，也不要一遍又一遍地循环重新打开同一文件。
You keep overwriting the same file in the loop, so only the last line will "survive".
Open the BufferedWriter outside of the loop (once!) and close it when done.
An alternative would be to open in append mode, but even then don't reopen the same file in a loop over and over again.