dataio.java

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import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
//该方法用来写入指定数量的字符  
class DataIO {
   public static String readFixedString(int size,
      DataInput in) throws IOException {
      StringBuffer b=new StringBuffer(size);

      int i=0;
      boolean more=true;
      while(more&&i<size) {
         char ch=in.readChar();
         i++;
         if(ch==0) more=false;
         else b.append(ch);
      }
      in.skipBytes(2*(size-i));
      return b.toString();
   }

   public static void writeFixedString(String s,int size,
      DataOutput out) throws IOException {
      int i;
      for(i=0;i<size;i++) {
         char ch=0;
         if(i<s.length()) ch=s.charAt(i);
         out.writeChar(ch);
      }
   }
}