java 读写txt文件测试

今天需要读取两个文件中的数据，找出文件2中存在而文件1中不存在的数据，读取内容加入set集合，使用set的removeall找出差集。写入到新的txt中。

测试代码：

package connect.util;

import java.io.*;
import java.util.HashSet;
import java.util.Set;

/**
 * 读取txt  test
 */
public class ReadTxtFile {
 
 
public static void readTxt(String filePath,String filePath2) {
 
  try {
    File file = new File(filePath);
    File file2 = new File(filePath2);
    if(file.isFile() && file.exists()) {
      Set<String> set1 =new HashSet<String>();
      Set<String> set2 =new HashSet<String>();
      Set<String> set3 =new HashSet<String>();
      InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8");
      InputStreamReader isr2 = new InputStreamReader(new FileInputStream(file2), "utf-8");
      BufferedReader br = new BufferedReader(isr);
      BufferedReader br2 = new BufferedReader(isr2);
      String lineTxt = null;
      String lineTxt2 = null;
      while ((lin