java如何对文件追加写入【new FileOutputStream(file, true)】

java文件追加内容的三种方法：

方法一：

public static void writeToTxtByRandomAccessFile(File file, String str){

RandomAccessFile randomAccessFile = null;

try {

randomAccessFile = new RandomAccessFile(file,"rw");

long len = randomAccessFile.length();

randomAccessFile.seek(len);

randomAccessFile.writeBytes(new String(str.getBytes(),"iso8859-1")+"\r\n");

} catch (FileNotFoundException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}finally{

try {

randomAccessFile.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

方法二：

public static void writeToTxtByFileWriter(File file, String content){

BufferedWriter bw = null;

try {

FileWriter fw = new FileWriter(file, true);

bw = new BufferedWriter(fw);

bw.write(content);

} catch (IOException e) {

e.printStackTrace();

}finally{

try {

bw.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

方法三：

public static void writeToTxtByOutputStream(File file, String content){

BufferedOutputStream bufferedOutputStream = null;

try {

bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file, true));

bufferedOutputStream.write(content.getBytes());

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch(IOException e ){

e.printStackTrace();

}finally{

try {

bufferedOutputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}