Question

我在这方面遇到了麻烦

//obj.generateIndexes(failuSarasas, 2);
HashMap<String, HashMap<String, Integer>> indTwoList = obj.generateIndexes(failuSarasas, 2);
obj.printHashMap(indTwoList);
//obj.generateIndexMatrix(indTwoList, failuSarasas);

和

HashMap<String, HashMap<String, Integer>> indexList = new HashMap<String, HashMap<String, Integer>>();
for (int i = 0; i < fileList.length; i++)

package modeliavimas2;

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

import org.apache.commons.io.FileUtils;

public class mainas
{
      public static void main(String[] args) throws IOException
        {
            mainas obj = new mainas();
            File[] failuSarasas = obj.getFileList();

            //obj.generateIndexes(failuSarasas, 2);
            HashMap<String, HashMap<String, Integer>> indTwoList = obj.generateIndexes(failuSarasas, 2);
            obj.printHashMap(indTwoList);
            //obj.generateIndexMatrix(indTwoList, failuSarasas);

            Scanner scaner = new Scanner(System.in);
            System.out.println("Iveskite termina arba 1, kad iseit");
            while(true)
            {
                String phrase = scaner.nextLine();
                if(phrase.equals("1"))
                {
                    break;
                }
                obj.search(phrase, 2);
                System.out.println("Iveskite termina arba 1, kad iseit");
            }

            scaner.close();
        }

    public File[] getFileList()
    {
        File folder = new File(
                " C:\\Users\\Dell Pc\\Desktop\\inform\\Informacijos modeliavimas\\Informacijos modeliavimas\\ld2\\pages");
        File[] listOfFiles = folder.listFiles();
        return listOfFiles;
    }

    public HashMap<String, HashMap<String, Integer>> generateIndexes(File[] fileList, int phraseLen) throws IOException
    {
        HashMap<String, HashMap<String, Integer>> indexList = new HashMap<String, HashMap<String, Integer>>();
        for (int i = 0; i < fileList.length; i++)
        {
            ArrayList<String> pageWords = new ArrayList<String>();
            HashMap<String, Integer> hashMap = new HashMap<String, Integer>();
            File file = fileList[i];
            if (file.isFile() && file.getName().endsWith(".txt"))
            {
                String content = FileUtils.readFileToString(file, "UTF8");
                for (String a : content.split(" "))
                {
                    a = a.toLowerCase();
                    a = a.replaceAll("\\W|\\d|\\_", ""); // isvalyt visus
                                                            // neraidinius arba neskaicius
                    if (a.length() >= 3 && a.length() <= 15)
                    {
                        pageWords.add(a); // 
                    }
                }
                if(phraseLen <= 1)
                {
                    for(String a : pageWords)
                    {
                        if(!hashMap.containsKey(a))
                        {
                            hashMap.put(a, 1);
                        } else
                        {
                            hashMap.put(a, hashMap.get(a) + 1);
                        }
                    }
                }
                else
                {
                    for(int j = phraseLen; j < pageWords.size(); j++)
                    {
                        String a = pageWords.get(j-1) + " "+ pageWords.get(j);
                        if(!hashMap.containsKey(a))
                        {
                            hashMap.put(a, 1);
                        }
                        else
                        {
                            hashMap.put(a, hashMap.get(a) + 1);
                        }
                    }
                }
                indexList.put(file.getName(), hashMap);
            }
        }
        return indexList;
    }

    public void printHashMap(HashMap<String, HashMap<String, Integer>> indexList)
    {
        for (String a : indexList.keySet())
        {
            HashMap<String, Integer> map = indexList.get(a);
            for (String b : map.keySet())
            {
                String key = b.toString();
                String value = map.get(b).toString();
                System.out.println(key + " " + value);
            }
        }

    }

    public void generateIndexMatrix(HashMap<String, HashMap<String, Integer>> indexList, File[] fileList)
            throws FileNotFoundException, UnsupportedEncodingException
    {
        PrintWriter writer = new PrintWriter("debug2.txt", "UTF-8");
        ArrayList<String> termList = new ArrayList<String>();
        for (String a : indexList.keySet())
        {
            HashMap<String, Integer> map = indexList.get(a);
            for (String b : map.keySet())
            {
                if (!termList.contains(b.toString()))
                {
                    termList.add(b.toString());
                }
            }
        }
        String[][] matrix = new String[fileList.length+1][termList.size()+1];
        int counter = 1;
        for (String a : termList)
        {
            matrix[0][counter++] = a;
        }
        counter = 1;
        for(File a : fileList)
        {
            matrix[counter++][0] = a.getName();
        }
        for(int i = 0; i < matrix.length; i++)
        {
            for(int j = 0; j < matrix[i].length; j++)
            {
                if(i > 0 && j > 0)
                {
                    if(indexList.get(matrix[i][0]).get(matrix[0][j]) != null)
                    {
                        writer.print(indexList.get(matrix[i][0]).get(matrix[0][j]) + " ");
                    }
                    else
                    {
                        writer.print(0+" ");
                    }
                }
                else
                {
                    writer.print(matrix[i][j]+" ");
                }
            }
            writer.println();
        }
        writer.close();
    }

    public void search(String searchPhrase, int phraseLen) throws IOException
    {
        String[] searchTermsRaw = searchPhrase.split(" ");
        ArrayList<String> searchTermsProc = new ArrayList<String>();

        // apdorojam paieskos zodzius
        if(phraseLen <= 1)
        {
            for(String a : searchTermsRaw)
            {
                a = a.toLowerCase();
                a = a.replaceAll("\\W|\\d|\\_", "");
                searchTermsProc.add(a);
            }
        }
        else
        {
            for(int i = 1; i < searchTermsRaw.length; i++)
            {
                searchTermsRaw[i] = searchTermsRaw[i].replaceAll("\\W|\\d|\\_", "");
                String a = searchTermsRaw[i - 1] + " " + searchTermsRaw[i];
                a = a.toLowerCase();
                searchTermsProc.add(a);
            }
        }


        ArrayList<ArrayList<String>> indexMatrix = new ArrayList<ArrayList<String>>();
        ArrayList<String> containingPages = new ArrayList<String>();
        try (BufferedReader br = new BufferedReader(new FileReader("c:\\Users\\ASUSPC\\Documents\\Uni stuff\\Eclipse projects\\modeliavimas2\\debug2.txt"))) // irasyti indexu matricos faila
        {
            String line = br.readLine();
            Boolean firstLine = true;
            while (line != null)
            {
                ArrayList<String> list = new ArrayList<String>();
                if(phraseLen <= 1)
                {
                    for(String a : line.split(" "))
                    {
                        list.add(a);
                    }
                }
                else
                {
                    String[] a = line.split(" ");
                    for(int i = 1; i < a.length; i++)
                    {
                        String temp = "";
                        if(firstLine)
                        {
                            if(i+1 < a.length)
                            {
                                temp = a[i] + " " + a[i + 1];
                            }
                            i++;
                        }
                        else
                        {
                             temp = a[i];
                        }
                        list.add(temp);
                    }
                }
                indexMatrix.add(list);
                firstLine = false;
                line = br.readLine();
            }
        }
        for(int i = 1; i < indexMatrix.size(); i++)
        {
            int counter = 0;
            for(String a : searchTermsProc)
            {
                int xpos = indexMatrix.get(0).indexOf(a);
                if(xpos == -1)
                {
                    continue;
                }
                if(Integer.parseInt(indexMatrix.get(i).get(xpos)) != 0)
                {
                    counter++;
                }
            }
            if(counter == searchTermsProc.size())
            {
                containingPages.add(String.valueOf(i));
            }
            counter = 0;
        }
        System.out.println("Rasti terminai rasti:");
        for(String a: containingPages)
        {
            System.out.println(a);
        }
        if(containingPages.size() == 0)
        {
            System.out.println("Terminas nerastas nei viename dokumente");
        }
    }
}

Answer 1

您的failuSarasas对象为空，因为这段代码似乎返回null：

public File[] getFileList() { File folder = new File( " C:\\Users\\Dell Pc\\Desktop\\inform\\Informacijos modeliavimas\\Informacijos modeliavimas\\ld2\\pages"); File[] listOfFiles = folder.listFiles(); return listOfFiles; }

您甚至可以在使用新的File对象执行任何操作之前检查文件是否存在。 File类有一个exist()方法，您可以使用它来做到这一点。祝你好运！

修改每个Oracle文档...

public File [] listFiles（）

返回一个抽象路径名数组，表示此抽象路径名表示的目录中的文件。

如果此抽象路径名不表示目录，则此方法返回null。否则返回一个File对象数组，一个用于目录中的每个文件或目录...

看到第三段？这就是为什么我怀疑你提供的路径不存在，这就是为什么我说要先通过File#exists()方法进行检查。

以下是文档文档的链接：https://docs.oracle.com/javase/7/docs/api/java/io/File.html#listFiles()

P.S。除非您需要使用File，否则我建议您使用Files以及该程序包中的那些项目（java.nio.file）。

我坚持使用Java项目

1 个答案: