java中文件输入输出的问题
答案:2 悬赏:50 手机版
解决时间 2021-05-02 01:51
- 提问者网友：刺鸟
- 2021-05-01 02:48
源代码：
import java.io.*;
class Test2{
public static void main(String[] args)throws Exception{
RandomAccessFile rfa=new RandomAccessFile("1.txt","rw");
Student s1=new Student(1,"zhangsan",99.8);
Student s2=new Student(2,"lisi",95.0);
Student s3=new Student(3,"wangwu",88.5);
s1.putter(rfa);
s2.putter(rfa);
s3.putter(rfa);
Student s=new Student();
rfa.seek(0);
for(long i=0;i<rfa.length();i=rfa.getFilePointer()){
s.getter(rfa);
System.out.println(s.num+":"+s.name+":"+s.sorce);
}
rfa.close();
}
}
class Student{
int num;
double sorce;
String name;
Student(){
}
Student(int num,String name,double sorce){
this.num=num;
this.name=name;
this.sorce=sorce;
}
public void putter(RandomAccessFile rtf) throws IOException{
rtf.writeInt(num);
rtf.writeUTF(name);
rtf.writeDouble(sorce);
}
public void getter(RandomAccessFile rtf) throws IOException{
num=rtf.readInt();
name=rtf.readUTF();
sorce=rtf.readDouble();
}
}
为什么执行后还有这样的错误出来：
1:zhangsan:99.8
2:lisi:95.0
3:wangwu:88.5
Exception in thread "main" java.io.EOFException
at java.io.RandomAccessFile.readUnsignedShort(RandomAccessFile.java:656)
at java.io.DataInputStream.readUTF(DataInputStream.java:545)
at java.io.RandomAccessFile.readUTF(RandomAccessFile.java:875)
at Student.getter(Test2.java:46)
at Test2.main(Test2.java:17)
麻烦哪位高手指点一下。
最佳答案
- 五星知识达人网友：一叶十三刺
- 2021-05-01 03:50
你的代码我再eclipse 3.4.2 + jdk1.5.0_21上执行没有任何问题
也没见抛出异常，是不是版本的问题？
全部回答
我用1.5.0_20试过，也没有复制出您遇到的问题。查了一下，2007年之前的Java版本，当所需要读的bytes还没有读够但就已经到了文件末端（end-of-file）的时候就会抛出EOFException。我想如果您换一下您的Java版本应该就可以避免这个问题出现。以下是Reference:
http://www.docjar.com/html/api/java/io/RandomAccessFile.java.html
47 * It is generally true of all the reading routines in this class that
48 * if end-of-file is reached before the desired number of bytes has been
49 * read, an <code>EOFException</code> (which is a kind of
50 * <code>IOException</code>) is thrown. If any byte cannot be read for
51 * any reason other than end-of-file, an <code>IOException</code> other
52 * than <code>EOFException</code> is thrown. In particular, an
53 * <code>IOException</code> may be thrown if the stream has been closed.
54 *
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