Java 如何使用缓冲写入器逐行写入文件?
下面是我的代码,用于逐行在文件中写入文本Java 如何使用缓冲写入器逐行写入文件?,java,file,filewriter,bufferedwriter,Java,File,Filewriter,Bufferedwriter,下面是我的代码,用于逐行在文件中写入文本 public class TestBufferedWriter { public static void main(String[] args) { // below line will be coming from user and can vary in length. It's just an example String data = "I will write this String to File
public class TestBufferedWriter {
public static void main(String[] args) {
// below line will be coming from user and can vary in length. It's just an example
String data = "I will write this String to File in Java";
int noOfLines = 100000;
long startTime = System.currentTimeMillis();
writeUsingBufferedWriter(data, noOfLines);
long stopTime = System.currentTimeMillis();
long elapsedTime = stopTime - startTime;
System.out.println(elapsedTime);
System.out.println("process end");
}
private static void writeUsingBufferedWriter(String data, int noOfLines) {
File file = new File("C:/testFile/BufferedWriter.txt");
FileWriter fr = null;
BufferedWriter br = null;
String dataWithNewLine=data+System.getProperty("line.separator");
try{
fr = new FileWriter(file);
br = new BufferedWriter(fr);
for(int i = 0; i<noOfLines; i++){
br.write(dataWithNewLine);
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
br.close();
fr.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
公共类TestBufferedWriter{
公共静态void main(字符串[]args){
//下面的一行将来自用户,长度可以不同。这只是一个例子
String data=“我将用Java将此字符串写入文件”;
int noOfLines=100000;
long startTime=System.currentTimeMillis();
writeUsingBufferedWriter(数据,noofline);
长停止时间=System.currentTimeMillis();
长延时=停止时间-开始时间;
System.out.println(elapsedTime);
System.out.println(“过程结束”);
}
私有静态void writeUsingBufferedWriter(字符串数据,整数noofline){
File File=新文件(“C:/testFile/BufferedWriter.txt”);
FileWriter fr=null;
BufferedWriter br=null;
字符串dataWithNewLine=data+System.getProperty(“line.separator”);
试一试{
fr=新的文件编写器(文件);
br=新的缓冲写入程序(fr);
对于(int i=0;i您可以在每次调用br.write(dataWithNewLine);
(在循环内部)之后调用br.flush()
更简洁的替代方法是使用:
您可以使用println
写入此文件,就像使用System.out
一样,它每次都会刷新
这也意味着您不必担心显式追加换行符。另外:使用try with resources,而不是手动关闭流。您是否可以评论一下BufferedWriter的含义?
PrintWriter pw = new PrintWriter(fr, true);