java读取按行txt文件

1import java.io.BufferedReader;
2import java.io.FileInputStream;
3import java.io.InputStreamReader;
4
5public class T {
6    public static void main(String[] args) throws Exception{
7        long startTime=System.currentTimeMillis();   //获取开始时间
8        FileInputStream filestream=new FileInputStream("src/jedis/1.txt");
9        byte[] b = new byte[3];
10        filestream.read(b);
11        String ecode="gbk";
12        if (b[0] == -17 && b[1] == -69 && b[2] == -65){
13            ecode="utf-8";
14        }
15        InputStreamReader readStream=new InputStreamReader(filestream,ecode);
16        BufferedReader reader=new BufferedReader(readStream);
17        
18        String temp=null;
19        int line=0;//行号
20        while((temp=reader.readLine())!=null){
21            line++;
22            System.out.println(line+":"+temp);
23        }
24        
25        long endTime=System.currentTimeMillis(); //获取结束时间
26        if(readStream!=null){
27            readStream.close();
28        }
29        if(reader!=null){
30            reader.close();
31        }
32        System.out.println("程序运行时间： "+(endTime-startTime)/1000+"s");
33    }
34}