import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException; public class JavaFile {  public static void main(String[] args) {   try {   // read file content from file   StringBuffer sb= new StringBuffer("");      FileReader reader = new FileReader("c://test.txt");   BufferedReader br = new BufferedReader(reader);      String str = null;      while((str = br.readLine()) != null) {     sb.append(str+"/n");          System.out.println(str);   }      br.close();   reader.close();      // write string to file   FileWriter writer = new FileWriter("c://test2.txt");   BufferedWriter bw = new BufferedWriter(writer);   bw.write(sb.toString());      bw.close();   writer.close();  }  catch(FileNotFoundException e) {     e.printStackTrace();   }   catch(IOException e) {     e.printStackTrace();   }  } }

#include<string>#include<iostream>#include<stdlib.h>#include<fstream>int main(){std::string file_name="123";std::ifstream fin(file_name.c_str());std::string textline[3];for(int i=0;i<3;++i) getline(fin,textline[i],'/n');//遇到換行結束這一行的讀取for(int i=0;i<3;++i)std::cout<<textline[i]<<'/n';return 0;}

 <?php    /**   * 按行讀取文件   * @param string $filename   */  function readFileByLine ($filename)  {   $fh = fopen($filename, 'r');      while (! feof($fh)) {    $line = fgets($fh);    echo $line;   }      fclose($fh);  }    // test    $filename = "/home/wzy/test/sort.txt";    readFileByLine($filename); 

 #include <stdio.h>  #include <stdlib.h>  #include <string.h>    #define LEN 1024    int main(void)  {   char filename[LEN], buf[LEN];   FILE *fp;   int len;     scanf("%s", filename);     fp = fopen(filename, "r");     if (fp == NULL) exit(-1);     while (fgets(buf, LEN, fp) != NULL) {    len = strlen(buf);    buf[len - 1] = '/0'; // 去掉換行符      printf("%s/n", buf);   }     return 0;  }