相同文件读取

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class Merge {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("D:\\xx.txt"), Charset.forName("utf-8")));
		
		Map<String, Bean> map = new HashMap<String, Bean>();
		
		put(map,br);
		
		br = new BufferedReader(new InputStreamReader(new FileInputStream("D:\\xx.txt"), Charset.forName("utf-8")));
		
		put(map,br);
		
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D:\\merge.txt"), Charset.forName("utf-8")));
		
		for(Entry<String, Bean> entry : map.entrySet()){
			String newLine = entry.getKey() + "\t" + entry.getValue().clicks + "\t" + entry.getValue().cost;
			bw.write(newLine);
			bw.newLine();
		}
		bw.close();
		System.out.println("end");
	}
	
	public static void put(Map<String, Bean> map, BufferedReader br) throws NumberFormatException, IOException{
		String line;
		String[] arr;
		Bean bean;
		while((line = br.readLine()) != null){
			arr = line.trim().split("\t");
			if(map.containsKey(arr[0].trim())){
				bean = map.get(arr[0].trim());
				bean.cost += Float.parseFloat(arr[2].trim());
				bean.clicks += Integer.parseInt(arr[1].trim());
				map.put(arr[0].trim(), bean);
			}else{
				bean = new Bean();
				bean.clicks = Integer.parseInt(arr[1].trim());
				bean.cost = Float.parseFloat(arr[2].trim());
				map.put(arr[0].trim(), bean);
			}
		}
		
		br.close();
	}
	
	public static class Bean{
		public float cost;
		public int clicks;
	}

}