下面代码演示如何使用BufferedOutputStream类写文件。

使用BufferedOutputStream类写文件，需要先将字符串转换为字节数组，然后再写入。

import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
*
* @author outofmemory.cn
*/
public class Main {

/**
* Prints some data to a file
*/
public void writeToFile(String filename) {

BufferedOutputStream bufferedOutput = null;

try {

//Construct the BufferedOutputStream object
bufferedOutput = new BufferedOutputStream(new FileOutputStream(filename));

//Start writing to the output stream
bufferedOutput.write("Line one".getBytes());
bufferedOutput.write("\n".getBytes()); //new line, you might want to use \r\n if you're on Windows
bufferedOutput.write("Line two".getBytes());
bufferedOutput.write("\n".getBytes());

//prints the character that has the decimal value of 65
bufferedOutput.write(65);

} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
//Close the BufferedOutputStream
try {
if (bufferedOutput != null) {
bufferedOutput.flush();
bufferedOutput.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().writeToFile("myFile.txt");
}
}