/**

* 根據指定行寫數據

*

* @param lineNumber 要存的行數

* @param data 要存儲的數據

*/

public static void setAppointedLineNumber(int lineNumber, String data) throws IOException {

Path path = Paths.get(configuration);

List lines = Files.readAllLines(path, StandardCharsets.UTF_8);

lines.set(lineNumber - 1, data);

Files.write(path, lines, StandardCharsets.UTF_8);

}

/**

* 1.根據指定行讀數據

*

* @param lineNumber

*/

public static String readAppointedLineNumber(int lineNumber) {

String appointedLine = "";

FileReader in = null;

LineNumberReader reader = null;

try {

in = new FileReader(configuration);

reader = new LineNumberReader(in);

long totalLine = Files.lines(Paths.get(configuration)).count();

if (lineNumber < 0 || lineNumber > totalLine) {

throw new Exception("指定行【" + lineNumber + "】不在文件行數范圍內");

}

int line = 1;

reader.setLineNumber(lineNumber);

long i = reader.getLineNumber();

String s = "";

while ((s = reader.readLine()) != null) {

if (i == line) {

appointedLine = s;

break;

}

line++;

}

return appointedLine;

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

} finally {

closeResource(in, reader);

}

return appointedLine;

}

/**

* 2.關閉資源

*

* @param in

* @param reader

*/

public static void closeResource(FileReader in, LineNumberReader reader) {

try {

if (reader != null) {

reader.close();

}

if (in != null) {

in.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

標簽：Java,String,讀寫,reader,指定,param,printStackTrace,lineNumber,null

來源： https://blog.csdn.net/sz793919425/article/details/110920319

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