正文
java：I/O 一行一行读取和写入
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
复制小程序
BufferedReader逐行读取
import java.io.*;
class Test
{
public static void main(String args []){
FileReader reader =null;
BufferedReader bufferedReader =null;
try{
reader = new FileReader("e://d/from.txt");
bufferedReader = new BufferedReader(reader);
String line =null;
while(true){
line =bufferedReader.readLine();
if(line ==null){
break;
}
System.out.println(line);
} }catch(Exception e){
System.out.println(e);
}
finally{
try{
bufferedReader.close();
reader.close(); }catch(Exception e){
System.out.println(e);
}
}
}
}
BufferedWriter逐行写入
import java.io.*;
class Test
{
public static void main(String [] args){
FileWriter fw =null;
BufferedWriter bw =null;
String [] arrs = {
"zhang,33",
"li,44"
};
try{
fw = new FileWriter("e://d/from.txt");
bw = new BufferedWriter(fw); for(String arr:arrs){
bw.write(arr+"\t\n");
}
/*等效于
for(int i=0;i<arrs.length;i++){
bw.write(arrs[i]+"\t\n");
}
*/ }catch(Exception e){
System.out.println(e);
}
finally{
try{
bw.close();
fw.close(); }catch(Exception e){
System.out.println(e);
}
}
}
}
