我创建了一个 Java 程序,它会根据关键字文本文件从各种社交媒体 API 返回搜索结果,并将返回的结果写入另一个文本文件。
我现在正在尝试创建另一个单独的类,该类将扫描搜索结果文本文件并返回有关在搜索结果中找到“关键字”的次数的统计信息。我基本上是在尝试对keywords.txt 文件进行搜索。
我一直试图让下面的代码工作,但我只能让它返回所有单词,而不仅仅是来自keywords.txt文件的那些。
我试图让输入 StreamReader 工作但无济于事。任何帮助将不胜感激。
package search;
import java.util.*; // Provides TreeMap, Iterator, Scanner
import java.io.*; // Provides FileReader, FileNotFoundException
public class SearchResults
{
public static void main(String[] args)
{
TreeMap<String, Integer> frequencyData = new TreeMap<String, Integer>();
readWordFile(frequencyData);
printAllCounts(frequencyData);
}
public static int getCount(String word, TreeMap<String, Integer> frequencyData)
{
if (frequencyData.containsKey(word))
{ // The word has occurred before, so get its count from the map
return frequencyData.get(word); // Auto-unboxed
}
else
{ // No occurrences of this word
return 0;
}
}
public static void printAllCounts(TreeMap<String, Integer> frequencyData)
{
System.out.println("-----------------------------------------------");
System.out.println(" Occurrences Word");
for(String word : frequencyData.keySet())
{
System.out.printf("%15d %s\n", frequencyData.get(word), word);
}
System.out.println("-----------------------------------------------");
}
public static void readWordFile(TreeMap<String, Integer> frequencyData)
{
Scanner wordFile;
String word; // A word read from the file
Integer count; // The number of occurrences of the word
try
{
wordFile = new Scanner(new FileReader("SearchResults.txt"));
}
catch (FileNotFoundException e)
{
System.err.println(e);
return;
}
while (wordFile.hasNext())
{
// Read the next word and get rid of the end-of-line marker if needed:
word = wordFile.next();
// Get the current count of this word, add one, and then store the new count:
count = getCount(word, frequencyData) + 1;
frequencyData.put(word, count);
}
}
}