<span style="font-size:18px;">import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
//给多行文本添加 前标 1. 2. 3. 4. 5. 6. 7.
//.readLine()方法
//读取一个文本行。通过下列字符之一即可认为某行已终止:换行 ('\n')、回车 ('\r') 或回车后直接跟着换行。
public class Demo5 {
public static void main(String[] args) {
try (BufferedReader reader = new BufferedReader(new FileReader(
new File("./res/abc.txt")));
BufferedWriter writer = new BufferedWriter(new FileWriter(
new File("./res/ccc.txt")))) {
String temp = null;
int i = 1;
while ((temp = reader.readLine()) != null) {
System.out.println(i + "." + temp);
writer.write(i + "." + temp + "\r\n");
i++;
}
} catch (Exception e) {
// TODO: handle exception
}
}
}
</span>