一些语言的按行读取文件的代码实现小结

Java实现

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();
}
}
}

C++实现

#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');//遇到换行结束这一行的读取
for(int i=0;i<3;++i)
std::cout<<textline[i]<<'\n';
return 0;
}

php实现

<?php
/**
* 按行读取文件
* @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);

c语言实现

#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'; // 去掉换行符
printf("%s\n", buf);
}
return 0;
}

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