我正在使用 PDFbox 制作一個 java 程序，它讀取任何 pdf 文件并計算每個單詞在文件中出現(xiàn)的次數(shù)，但由于某種原因，當(dāng)我運行程序時沒有出現(xiàn)任何內(nèi)容，我希望它打印每個單詞以及出現(xiàn)的次數(shù)旁邊的字。提前致謝。這是我的代碼：package lab8;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.util.Map;import java.util.TreeMap;import java.util.Scanner;import org.apache.pdfbox.pdmodel.PDDocument;import org.apache.pdfbox.text.PDFTextStripper;public class Extractor {public static void main(String[] args) throws FileNotFoundException { Map<String, Integer> frequencies = new TreeMap<String, Integer>(); PDDocument pd; File input = new File("C:\\Users\\Ammar\\Desktop\\Application.pdf"); Scanner in = new Scanner(input); try { pd = PDDocument.load(input); PDFTextStripper stripper = new PDFTextStripper(); stripper.setEndPage(20); String text = stripper.getText(pd); while (in.hasNext()) { String word = clean(in.next()); if (word != "") { Integer count = frequencies.get(word); if (count == null) { count = 1; } else { count = count + 1; } frequencies.put(word, count); } } for (String key : frequencies.keySet()) { System.out.println(key + ": " + frequencies.get(key)); } if (pd != null) { pd.close(); } } catch (IOException e) { e.printStackTrace(); } } private static String clean(String s) { String r = ""; for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (Character.isLetter(c)) { r = r + c; } } return r.toLowerCase(); } }
2 回答
子衿沉夜
TA貢獻(xiàn)1828條經(jīng)驗 獲得超3個贊
我試圖解決這個邏輯。
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;
import java.util.TreeMap;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
public class Extractor {
public static void main(String[] args) throws FileNotFoundException {
Map<String, Integer> wordFrequencies = new TreeMap<String, Integer>();
Map<Character, Integer> charFrequencies = new TreeMap<Character, Integer>();
PDDocument pd;
File input = new File("C:\\Users\\Ammar\\Desktop\\Application.pdf");
try {
pd = PDDocument.load(input);
PDFTextStripper stripper = new PDFTextStripper();
stripper.setEndPage(20);
String text = stripper.getText(pd);
for(int i=0; i<text.length(); i++)
{
char c = text.charAt(i);
int count = charFrequencies.get(c) != null ? (charFrequencies.get(c)) + 1 : 1;
charFrequencies.put(c, count);
}
String[] texts = text.split(" ");
for (String txt : texts) {
int count = wordFrequencies.get(txt) != null ? (wordFrequencies.get(txt)) + 1 : 1;
wordFrequencies.put(txt, count);
}
System.out.println("Printing the number of words");
for (String key : wordFrequencies.keySet()) {
System.out.println(key + ": " + wordFrequencies.get(key));
}
System.out.println("Printing the number of characters");
for (char charKey : charFrequencies.keySet()) {
System.out.println(charKey + ": " + charFrequencies.get(charKey));
}
if (pd != null) {
pd.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
試試這個代碼。如果仍然存在一些問題并且您無法解決。我可以嘗試解決。
慕標(biāo)5832272
TA貢獻(xiàn)1966條經(jīng)驗 獲得超4個贊
在您的代碼中，您還可以通過傳遞您的字符串來使用 StringTokenizer 的對象，即
StringTokenizer st = new StringTokenizer(stripper.getText(pd));
并在 while 循環(huán)st.hasMoreTokens()中渲染每個單詞String word = clean(st.nextToken());這也很好用。
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