dataparser.java

来自「神经网络源代码,实现了一个BP神经网络,可以完成基于BP的神经网络算法.」· Java 代码 · 共 58 行

package net.openai.ai.nn.parser;

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

public class DataParser {

    public DataParser() {

    }

    /**
     * Parses a file and returns the data in a hashtable, keyed on a
     * column name.
     * 
     * @param dataFileName The name of the file to be parsed.
     * @return Hashtable A hashtable containing the data, keyed on the
     * column name.
     */
    public static final Data parseData(String dataFileName) {
	Data data = new Data();
	//  see if we got a bad name
	if(dataFileName == null) {
	    db("Filename is null...");
	    return null;
	}
	//  create the file and see if it exists
	File dataFile = new File(dataFileName);
	if(!dataFile.exists()) {
	    db("File (" + dataFileName + ") does not exist.");
	    return null;
	}
	//  make sure we can read the file
	if(!dataFile.canRead()) {
	    db("File (" + dataFileName + ") is not readable.");
	    return null;
	}
	//  create the filereader
	FileReader fileReader;
	try {
	    fileReader = new FileReader(dataFile);
	} catch (FileNotFoundException fnfe) {
	    db("Could not find file: " + dataFileName);
	    return null;
	}
	//  create the bufferedreader
	BufferedReader bufferedReader = new BufferedReader(fileReader);
	//  read in the columns for the data
	try {    
	    String columnNames = bufferedReader.readLine();
	    StringTokenizer tokenizer = new StringTokenizer(columnNames);
	    while(tokenizer.hasMoreTokens()) {
		String columnName = tokenizer.nextToken();
		columnName = columnName.trim();
		data.addColumnName(columnName);
	    }
	} catch (IOException ioe) {
	    db("Could not read file: