多个文件合并，去除文件中的冗余信息

//将某一目录下的多个文件合并，并去除文件行中重复信息

package test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintStream;
import java.util.HashSet;
import java.util.Set;

public class ReadFileToNewFile {

	public void readAndWrite() throws IOException 
	
	{
		//利用Set去除冗余信息
		Set setString = new HashSet();

		String dirPath ="D:\\s\\";
		File file = new File(dirPath);
		File[] listfile = file.listFiles();
		for(int i =0 ;i