打印给应文件的行数

在生活或是编程中经常要打印一些指定的文件的中指定的行数，以求能够达到预想的打印效果，下面我将给大家介绍一种控制台输出的打印文件指定行数的代码：

 

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
public class Test {   
    /**  
     * 读取txt内容到数组  
     */  
    public static String[] getTxtContent(String path)   
    {   
        File f = null;   
        String[] a = null;   
           
        try {   
            a = new String[100000];    
            f=new File(path);    
            InputStreamReader read = new InputStreamReader(new FileInputStream(f), "GBK");     
            BufferedReader reader = new BufferedReader(read);   
            String line;   
            int i;   
               
            for (i = 0; i < 100000; i++)    
            {   
                if ((line = reader.readLine()) != null)   
                {   
                    a[i] = line;   
                }   
            }   
        } catch (UnsupportedEncodingException e) {   
            e.printStackTrace();   
        } catch (FileNotFoundException e) {   
            e.printStackTrace();   
        } catch (IOException e) {   
            e.printStackTrace();   
        }   
        return a;   
    }   
       
    /**  
     * 读取指定一行内容  
     * @param path  
     * @param row  
     * @return  
     */  
    public String listTxtByRow1(String path,Integer row)   
    {   
        String[] s = getTxtContent(path);   
        return "第"+row+"行："+s[row-1];   
  
    }   
    
    // 文件内容的总行数。   
    public static int getTotalLines(String path)  {   
        int lines = 0;   
     try {
      File file=new File(path);
            FileReader in = new FileReader(file);   
            LineNumberReader reader = new LinesNumberReader(in);   
            String s = reader.readLine();   
         
            while (s != null) {   
                lines++;   
                s = reader.readLine();   
            }   
            reader.close();   
            in.close();   
  } catch (Exception e) {
   e.printStackTrace();
  }
        return lines;   
   }   
       
    public List<String> listTxtByRow2(String path,Integer start,Integer end)   
    {   
        List<String> list =new ArrayList<String>();   
        String[] s = getTxtContent(path);   
           
        for(int i = start;i <= end;i++)   
        {   
            list.add(s[i-1]);   
        }   
        return list;   
    }   
    public static void main(String[] args) {
     String file="C://美好人生.txt";
        Test t = new Test();   
        int lineNum=20;// 打印文件的行数 
        List<String> list = t.listTxtByRow2(file, getTotalLines(file)-lineNum, getTotalLines(file));//取出2-5行数据 
        for(int i = 0;i<list.size();i++)   
        {   
             System.out.println(list.get(i));   
        }   
           
    }   
}