readdatafile.java

一本书中的原代码,有用多例子,很好用

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



public class readDataFile {
    //定义当前记录为空
    private String currentRecord=null;
    private BufferedReader file;
    private String path;
    private StringTokenizer token;
    
    
    public readDataFile() {
        file=new BufferedReader(new InputStreamReader(System.in),1);
    }
    public readDataFile(String filePath)
    throws FileNotFoundException {
        //取得文件
        path=filePath;
        file=new BufferedReader(new FileReader(path));
    }
    public void setPath(String filePath) {
        //设置文件路径
        path=filePath;
        try {
            file=new BufferedReader(new FileReader(path));
        }catch (FileNotFoundException e) {
            System.out.println("file not found");
        }
    }
    
    public String getPath() {
        //得到文件路径
        return path;
    }
    
    public void fileClose() throws IOException {
        //关闭文件
        file.close();
    }
    
    public int nextRecord() {
        //读取下一行记录，并返回取得的数目，若没有则返回-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 int returnInt() {
        //以整型方式取得下一条记录
        int returnint=Integer.parseInt(token.nextToken());
        return returnint;
    }
    
    public double returnDouble() {
        //以双精度万式取得下一条记录
        double doubleReturn=Double.valueOf(token.nextToken()).doubleValue();
        return doubleReturn;
    }
    
    public String returnString() {
        //以字符串方式取得下一条记录
        String stringReturn=token.nextToken();
        return stringReturn;
    }
    
    public String returnRecord() {
        //以字符串的形式返回整个记录
        return currentRecord;
        
    }
    
}