readfromfile.java

《JSP时尚编程百例》一例源代码81-100

import java.io.*;
import java.util.StringTokenizer;

public class ReadFromFile{
    private String currentRecord = null;
    private BufferedReader file;
    private String path;
    private StringTokenizer token;
    public ReadFromFile(){
        file = new BufferedReader(new InputStreamReader(System.in),1);
    }
    public ReadFromFile(String filePath) throws FileNotFoundException{
    // gets file
        path = filePath;
        file = new BufferedReader(new FileReader(path));
    }
    public void setPath(String filePath){
    // sets the file
        path = filePath;
        try {
            file = new BufferedReader(new FileReader(path));
        } catch (FileNotFoundException e){
            System.out.println("file not found");
        }
    }
    public String getPath(){
        return path;
    } // method getPath
    public void fileClose() throws IOException{
    // closes file
        file.close();
    } // method fileClose
    public int nextRecord(){
    // this method reads the next record and returns the number of tokens or else returns -1
        int returnInt = -1;
        try{
            currentRecord = file.readLine();
        } catch (IOException e){
            System.out.println("readLine problem, terminating.");
        }
        if (currentRecord == null)
            returnInt = -1;
        else{
            token = new StringTokenizer(currentRecord);
            returnInt = token.countTokens();
        }
        return returnInt;
    }
    public double returnDouble(){
    // this method returns the next token as a double
        double doubleReturn = Double.valueOf(token.nextToken()).doubleValue();
        return doubleReturn;
    }
    public int returnInt(){
    // this method returns the next token as an int
        int returnint = Integer.parseInt(token.nextToken());
        return returnint;
    }
    public String returnString(){
    // this method returns the next token as a String
        String stringReturn = token.nextToken();
        return stringReturn;
    }
    public String returnRecord(){
    // this method returna the entire record as a string
        return currentRecord;
    }
}