import.java

简易的学生课程成绩系统

import java.util.*;
import java.io.*;
public class Import 
{
    public static void main(String args[])
    {
     try{
        BufferedReader readfile = new BufferedReader(new FileReader("import.csv"));
        RandomAccessFile writefile = new  RandomAccessFile("database.csv","rw"); 
        String inputline1 = readfile.readLine();
        String inputline2;   
       while(inputline1!=null)
       {
           long pointer = writefile.getFilePointer();     
           boolean b = true;
           String []s = inputline1.trim().split(",");
           while((inputline2=writefile.readLine()) !=null)
          {
             String [] line = inputline2.trim().split(",");
             CompareString q0=new CompareString();
             CompareString q1=new CompareString();
             if((q0.compare(line[0],s[0])) && (q1.compare(line[1],s[1])))
             {
                 writefile.seek(pointer);
                 writefile.write(inputline1.getBytes());
                 b = false;
                 break;
              }
              pointer = writefile.getFilePointer();
           }
           if(b == true)
           {
             writefile.write(inputline1.getBytes());
             writefile.write('\n');
           }  
           inputline1 = readfile.readLine();
        }
        readfile.close();
        writefile.close();
     }
     catch(FileNotFoundException e)
    {
       System.out.println("File not found");
    }
    catch(IOException e)
    {
       System.out.println("IO Exception");
      
      }
    }
}