java对文件的操作如下

package day20181122;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.InputStreamReader;

public class ReadTxt {
    
  private   String fileName="stu.txt";
  
  public ReadTxt(String fileName) {
    
      this.fileName=fileName;
//    System.out.println("cionstruct");
  }
    
    public void readFile()
    {
     
        try {
            File file=new File(fileName);
            
            InputStreamReader in;
            in = new InputStreamReader(new FileInputStream(file),"utf-8");
            
             
            BufferedReader br=new BufferedReader(in);
            
             String line="";
            
              line=br.readLine();
              
              
              while(line!=null)
              {
                  
                  String[] data=line.split(";");
                  
                  int len=data.length;
                  
                  for(int i=0; i<len; i++)
                      System.out.println(data[i]+"-------");
                  
                  System.out.println(line);
                  line=br.readLine();             
              }                
              br.close();
            
        } catch (Exception e) {
            
            e.printStackTrace();
        }   
    }
    
    
 public void writeTxt(String filed)
 {
     
     String writeFileName="src/day20181122/student.txt";
     
     try {
         
         File f=new File(writeFileName);
         if(f.exists())
         f.createNewFile(); 
         BufferedWriter bw=new BufferedWriter(new FileWriter(f));
         bw.write(filed);
         bw.flush();
         bw.close();
         System.out.println("write file succeed");   
         
     }catch(Exception e) {
         e.printStackTrace();
     }
      
 }
    
     

}