编程真题邮寄包裹
代码如下:
导入Java . io . *;
导入Java . nio . *;
导入Java . nio . channels . file channel;
公共类Main
{
公共静态void main(String[] args)
{
Main t = new Main();
t.ReadFlieByLine _ IO(" E:\ \ 123 . txt ");
t.readfile byline _ NIO(" E:\ \ 123 . txt ");
}
public void ReadFlieByLine_IO(字符串文件名)
{
File file =新文件(文件名);
BufferedReader reader = null
尝试
{
System.out.println("以行为单位读取文件内容,一次一整行:");
reader = new buffered reader(new file reader(file));
String tempString = null
int line = 1;
//一次读取一行,直到读取null是文件的结尾。
while((tempString = reader . readline())!=空)
{//显示行号
system . out . println(" line "+line+":"+tempString);
line++;
}
reader . close();
}
catch (IOException e) {
e . printstacktrace();
}
/**最后{
如果(读者!= null){
尝试{
reader . close();
}
catch (IOException e1) {
}
}
}
*/
}
private void ReadFileByLine_NIO(字符串文件名)
{
FileInputStream file = null
FileChannel reader = null
尝试
{
file = new FileInputStream(文件名);
reader = file . get channel();
String tempString = null
byte buffer bb = byte buffer . allocate((int)reader . size());
reader . read(bb);
bb . flip();
String file content = new String(bb . array());
system . out . println(file content);
reader . close();
}
catch (IOException e) {
e . printstacktrace();
}
/**最后{
如果(读者!= null){
尝试{
reader . close();
}
catch (IOException e1) {
}
}
}
*/
}
}