fingers 生成指定大小的随机字符串并保存到文件

 

 

 简单小程序，备份而已

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class GenString {
public static void main(String[] args) throws IOException {
int[] cons = new int[]{1024,1450,4325};
File file = new File("./str.txt");
if(file.exists()){
System.out.println(file.delete());
}
for(int i = 0;i<cons.length;i++){
int len = cons[i];
char[] chars = gen(len);
FileWriter fileWriter = null;
try {
fileWriter = new FileWriter("./str.txt", true);
fileWriter.write(chars);
} catch (IOException e) {
e.printStackTrace();
}finally{
if(fileWriter!=null){
try {
fileWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

}
public static char[] gen(int length) {
char[] ss = new char[length];
int i=0;
while(i<length) {
int f = (int) (Math.random()*3%3);
if(f==0)
ss[i] = (char) ('A'+Math.random()*26);
else if(f==1)
ss[i] = (char) ('a'+Math.random()*26);
else
ss[i] = (char) ('0'+Math.random()*10);
i++;
}
return ss;
}
}