JAVA 文件读写

File f = new File("D://a.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(
new FileInputStream(f)));
String s = "";

while ((s = br.readLine()) != null) {
   
     

 

}

 

 

 

 

FileWriter fw = new FileWriter("D://a.txt", false);

fw.write(“aaa”);
fw.write("/r/n");