Question

我已经向文件写入了一个字符串，该字符串包含文件名及其长度。但是，当我从文件中提取该字符串，然后使用“空格”定界符将其拆分，然后尝试获取数字（即文件长度）时，它给出了NumberFormatException。有人可以帮忙吗？

import java.io.*;
public class DemoReadFromFile {
    public static void main(String[] args) throws IOException,NumberFormatException {
        byte[]b=new byte[100];int pos=0;byte[]data;
        System.arraycopy("dest.txt".getBytes(), 0, b, 0, "dest.txt".length());

        pos+="dest.txt".length()+1;
        System.arraycopy(" ".getBytes(),0,b,pos," ".length());//1 byte here
        pos+=1;
        System.arraycopy("11".getBytes(), 0, b, pos, 2);
        pos+=2;
        System.arraycopy("\n".getBytes(), 0, b, pos, "\n".length());
        pos+="\n".length();//1 byte here
        pos+=37;
        System.arraycopy("Hello World".getBytes(), 0, b, pos, "Hello World".length());
        FileOutputStream fos=new FileOutputStream(new File("DemoRead.txt"));
        fos.write(b);
        fos.close();
        //FileInputStream fis=new FileInputStream(new File("DemoRead.txt"));
        byte[]rhead=new byte[50];
        RandomAccessFile raf=new RandomAccessFile(new File("DemoRead.txt"),"rw");
        raf.seek(0);
        raf.readFully(rhead);
        String[] tok=new String(rhead).split(" ");
        for(String t:tok)
            System.out.println(t);
        System.out.println(tok[1]);
        raf.seek(50);
        Integer i=new Integer(tok[1]);
        int len=Integer.parseInt(tok[1]);
        data=new byte[i];
        raf.readFully(data);
        //System.out.println("Data is: "+new String(data));
    }
}

Answer 1

    String[] tok=new String(rhead).split("[ \t\n]");

分割字符串后获取NumberFormatException

1 个答案: