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我将10 GB文件拆分为100000多个文件(几百字)(因为我在读到100000字时读到了这行)。合并排序具有可变字数的多个文件
private void splitInputFile(String path) {
try{
File file=new File(path);
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
String temp;
temp = br.readLine();
String fileName="fileName";
int fileCount = 1;
while(temp!=null){
//TODO Read 100000 words, sort and write to a file. Repeat for the entire file
if(wordsToBeSorted.size()<=100000){
startCounting(temp);
temp=br.readLine();
}//end of if -> place 100000+ words inside the list
else{
Collections.sort(wordsToBeSorted);
fileName = "fileName"+fileCount;
fileCount++;
File splitFile = new File(fileName);
PrintWriter pr = new PrintWriter(splitFile);
for(String word:wordsToBeSorted){
pr.write(word);
pr.write("\n");//check if this works -> 1 word per line
}//end of for
}//end of else
}//end of while
mergeSort(fileCount);
}//end of try
catch(Exception e){
e.printStackTrace();
}
}
private void startCounting(String sb) {
StringTokenizer tokenizer = new StringTokenizer(sb);// Split by space
while (tokenizer.hasMoreTokens()) {
String text = tokenizer.nextToken();
text = text.replaceAll("\\W", "");// Remove all symbols
if("".equals(text.trim()))
continue;
wordsToBeSorted.add(text);
}
}
现在我想知道如何对这些文件进行排序。我发现我应该做一个合并排序。考虑到每个splitFile可能会有不定数量的单词(100000多少个额外单词)的事实,是否可以进行包含可变词计数文件的合并排序?或者我应该按照其他方法来分割文件?