代碼如下：
-
import java.io.FileWriter;
-
import java.io.IOException;
-
import java.io.RandomAccessFile;
-
-
public
class AppendToFile {
-
/**
-
* A方法追加文件：使用RandomAccessFile
-
*/
-
public static void appendMethodA(String fileName, String content) {
-
try {
-
// 打開一個隨機訪問文件流，按讀寫方式
-
RandomAccessFile randomFile =
new RandomAccessFile(fileName,
"rw");
-
// 文件長度，字節數
-
long fileLength = randomFile.length();
-
//將寫文件指針移到文件尾。在該位置發生下一個讀取或寫入操作。
-
randomFile.seek(fileLength);
-
//按字節序列將該字符串寫入該文件。
-
randomFile.writeBytes(content);
-
//關閉此隨機訪問文件流並釋放與該流關聯的所有系統資源。
-
randomFile.close();
-
}
catch (IOException e) {
-
e.printStackTrace();
-
}
-
}
-
-
/**
-
* B方法追加文件：使用FileWriter
-
*/
-
public static void appendMethodB(String fileName, String content) {
-
try {
-
//打開一個寫文件器，構造函數中的第二個參數true表示以追加形式寫文件,如果為 true，則將字節寫入文件末尾處，而不是寫入文件開始處
-
FileWriter writer =
new FileWriter(fileName,
true);
-
writer.write(content);
-
writer.close();
-
}
catch (IOException e) {
-
e.printStackTrace();
-
}
-
}
-
-
public static void main(String[] args) {
-
String fileName =
"C:/Temp.txt";
-
String content =
"new append!";
-
//按方法A追加文件
-
AppendToFile.appendMethodA(fileName, content);
-
AppendToFile.appendMethodA(fileName,
"append end. \n");
-
//顯示文件內容
-
ReadFromFile.readFileByLines(fileName);
-
//按方法B追加文件
-
AppendToFile.appendMethodB(fileName, content);
-
AppendToFile.appendMethodB(fileName,
"append end. \n");
-
//顯示文件內容
-
ReadFromFile.readFileByLines(fileName);
-
}
-
}
java控制台輸出結果如下：
-
++++++readFileByLines:++++++
-
以行為單位讀取文件內容，一次讀一整行：
-
line
1: Sun Yat-sen(November
12,
1866–March
12,
1925) was a Chinese revolutionary
and political leader who
is often referred
to
as the
"father of modern China". Sun played an instrumental
and leadership role
in the eventual overthrow
of the Qing Dynasty
in
1911. He was the first provisional president
when the Republic
of China was founded
in
1912. He later co-founded the Kuomintang (KMT)
where he served
as its first leader.
new append!append
end.
-
-
++++++readFileByLines:++++++
-
以行為單位讀取文件內容，一次讀一整行：
-
line
1: Sun Yat-sen(November
12,
1866–March
12,
1925) was a Chinese revolutionary
and political leader who
is often referred
to
as the
"father of modern China". Sun played an instrumental
and leadership role
in the eventual overthrow
of the Qing Dynasty
in
1911. He was the first provisional president
when the Republic
of China was founded
in
1912. He later co-founded the Kuomintang (KMT)
where he served
as its first leader.
new append!append
end.
-
line
2:
new append!append
end.