IO流中以字元流讀取和寫入。
字元流的讀取。
public static void readFileByBufferReanderLine(File file) {
BufferedReader bufferedReader = null;
String tempString = null;
try {
bufferedReader = new BufferedReader(new FileReader(file));
while ((tempString = bufferedReader.readLine()) != null) {
System.out.println(tempString)
}
}
} catch (FileNotFoundException e) { //進行讀取時需要捕獲異常。
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
字元流的寫入
public static void writeByBufferWriter(File file, String content) {
BufferedWriter bufferedWriter = null;
try {
bufferedWriter = new BufferedWriter(new PrintWriter(file));
bufferedWriter.write(content); // 寫在流中
bufferedWriter.flush(); // 需要衝刷到檔案種。
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedWriter != null) {
try {
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
以字元流方式寫入檔案
下面方式可以新增資料,而不刪除原來的資料
public static void writerByBufferWriter2(File file, String content) {
BufferedWriter bufferedWriter = null;
try {
bufferedWriter = new BufferedWriter(new FileWriter(file, true));
bufferedWriter.write(content);
bufferedWriter.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedWriter != null) {
try {
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}