[英]How Can I Read 2 lines From txt File
嘿伙计们,我正在处理这个问题,我想从 txt 文件合并到行并在 Arraylist 中显示它们,所以我的代码就是这样,我想跳过 -- 行以在 Arraylist 中显示..
私人列表 getQuotes(){
List<String> quotes = new ArrayList<>();
BufferedReader bufferedReader = null;
try {
InputStream open = getAssets().open("barish.txt");
bufferedReader = new BufferedReader(new InputStreamReader(open));
String line;
while ((line = bufferedReader.readLine()) != null) {
quotes.add(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return quotes;
}
[在此处输入图片说明][1]
txt 文件图像在这里 [1]: https : //i.stack.imgur.com/AiI67.png
在将其添加到引号列表之前,您可以检查该行是否不等于 --。
if(line.equals("--") == false) {
quotes.add(line);
}
编辑:将线条组合在一起
为了组合 -- 行之间的字符串,您可以将引号累积到每个 -- 之间的字符串quoteLine
。 因此,如果该行不是 -- 行,那么它将被附加到字符串quoteLine
。 如果它是一个 -- 行,那么它会将先前构造的引号添加到数组列表中,并将quoteLine
初始化为空字符串以重置它。
String line;
String quoteLine = "";
while ((line = bufferedReader.readLine()) != null) {
if(line.equals("--") == false) {
quotes.add(quoteLine);
quoteLine = "";
} else {
quoteLine += line;
}
}
尝试使用replaceAll方法然后读取文件如上
line = line.replaceAll("--"," ");
//删除所有“--”并将其替换为空格
你可以这样做:
public static List<List<String>> getQuotes(String file) {
List<List<String>> allQuotes = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
// Let's have a queue backed by LinkedList to keep the two
// lines just before the next line that is '--'.
Queue<String> quotes = new LinkedList<String>();
String line;
while ((line = br.readLine()) != null) {
// If the current line starts with -- and the two previous lines persisted
// in the quotes queue to allQuotes and clear the quotes. You can do an equals
// check here if you're certain about no leading and trailing white spaces in
// each line and it is always --.
if (line.trim().startsWith("--")) {
// Don't add quotes to allQuotes when quotes queue is empty.
// You can also check quotes.size() == 2 along with !quotes.isEmpty()
// if you want to always have at least two quotes in each sub-list retuned.
if (!quotes.isEmpty()) {
allQuotes.add(new ArrayList(quotes));
quotes.clear();
}
} else if (!line.trim().isEmpty()) {
// Add each line into the quotes queue if it is not blank
// or if it is not --
quotes.add(line);
}
// If the size of queue is > 2 remove an item from from the front,
// because we are only interested in two lines before --
if (quotes.size() > 2) {
quotes.remove();
}
}
} catch (Exception e) {
e.printStackTrace(); // TODO: Handle exceptions
return null;
}
return allQuotes;
}
我想也许你想要更像这样的东西:
public List<List<String>> getQuotes() {
List<List<String>> allQuotes = new ArrayList<>();
BufferedReader bufferedReader = null;
try {
InputStream open = getAssets().open("barish.txt");
bufferedReader = new BufferedReader(new InputStreamReader(open));
String line;
ArrayList<String> quote = new ArrayList<>();
while ((line = bufferedReader.readLine()) != null) {
if (line.equals("--")) {
if (!quote.isEmpty()) {
allQuotes.add(quote);
}
quote = new ArrayList<>();
} else {
quote.add(line);
}
}
if (!quote.isEmpty()) {
allQuotes.add(quote);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return allQuotes;
}
结果是一个List<List<String>>
:一个诗歌列表,每首诗歌都在它自己的List<String>
。
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