tenMillionFile.rs

tenMillionFile.rs

use std::rand;
use std::rand::Rng;

use std::old_io::BufferedReader;
use std::old_io::File;

fn write_file(path: &str, s: &str)
{
	use std::old_io::{BufferedWriter, File};

	let file = File::create(&Path::new(path)).unwrap();
	let mut writer = BufferedWriter::new(file);
	
	writer.write_str(s).unwrap();
	writer.flush().unwrap();
}

fn my_rand() -> i32 {
	let mut rng = rand::thread_rng();
	let n: i32 = rng.gen_range(1, 10000);
	n
}

fn main()
{
	for i in 0..10000
	{
		let mut s = String::with_capacity(262144);
		for j in 0..10000
		{
			let s_one:String = format!("{}\t{}\t{}\t{}\t{}",
				my_rand(),
				my_rand(),
				my_rand(),
				my_rand(),
				my_rand()
			);
			s.push_str(&s_one);
			if(j != 9999) { s.push_str("\n"); }
		}//生成10000行随机数
		//println!("{}\n", i);
						
		let path: String = format!("/tmp/out/r_{}", i);
		write_file(&path, &s);		
	}// 生成10000个文件	
}