合并兩個文本文件，并刪除合并后重復的行

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.InputStreamReader;

import java.util.Vector;

public class CleanFiles {

private static Vector stringlist;

public static void main(String[] args) throws Exception {

String filePath1;

String filePath2;

String filePath3;

String item;

stringlist = new Vector();

BufferedReader buffer = new BufferedReader(new InputStreamReader(

System.in));

System.out.println("請輸入文件1路徑和文件名：");

filePath1 = buffer.readLine();

System.out.println("請輸入文件2路徑和文件名：");

filePath2 = buffer.readLine();

System.out.println("請輸入合并后文件路徑和文件名");

filePath3 = buffer.readLine();

File file1 = new File(filePath1);

File file2 = new File(filePath2);

File file3 = new File(filePath3);

buffer.close();

buffer = new BufferedReader(new FileReader(file1));

while((item=buffer.readLine())!=null){

addString(stringlist,item);

}

buffer.close();

buffer = new BufferedReader(new FileReader(file2));

while((item= buffer.readLine())!=null){

addString(stringlist,item);

}

buffer.close();

// 搜索結果是經過排序的，根據此規律刪除不合要求File

for (int i = 0; i < stringlist.size()-1; i++) {

if(stringlist.get(i).equals(stringlist.get(i+1))){

stringlist.remove(i);

if(i!=0)i--;

}

}

BufferedWriter bufferWriter = new BufferedWriter(new FileWriter(file3));

for(String temp:stringlist){

bufferWriter.write(temp);

bufferWriter.newLine();

}

bufferWriter.close();

}

public static void addString(Vector allStrings, String str) {

if (allStrings.isEmpty()) {

allStrings.add(str);

} else {

// 二分查找法

int left = 0, right = allStrings.size() - 1, middle, compare;

if (str.compareToIgnoreCase(allStrings.get(right)) >= 0) {

allStrings.add(str);

return;

}

if (str.compareToIgnoreCase(allStrings.get(0)) <= 0) {

allStrings.add(0, str);

return;

}

while (true) {

middle = (left + right) / 2;

compare = str.compareToIgnoreCase(allStrings.get(middle));

if (compare == 0 || middle == left) {

allStrings.add(middle + 1, str);

return;

} else {

if (compare < 0) {

right = middle;

} else {

left = middle;

}

}

}

}

}

}

總結

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