Java 大数据 取出两列不同的值 生成到文本中

项目前端商城的订单和后端服务的订单有差异，金额比对不上，Excel又不会用，只有自己写代码了。

public class FindNotSameFieldUtil {
	private static final String encoding="GBK";
	private static final String n = System.getProperty("line.separator");
	
	public static void main(String[] args) throws Exception {
		Map<String,String> map1 = new HashMap<String, String>();
		String filePath1 = "c://05HX.txt";
		Map<String,String> map2 = new HashMap<String, String>();
		String filePath2 = "c://05SC.txt";
		
		ReadTxt(filePath1,map1);
		ReadTxt(filePath2,map2);
		
		for (Map.Entry<String,String> entry : map2.entrySet()) {
			if(map1.containsKey(entry.getKey())){
				map1.remove(entry.getKey());
			}
		}
		String filePath3 = "c://05DIFF.txt";
		GenerateFile(map1,filePath3);
		
	}
	/**
	 * 把读取到的字段放入到map中剔除重复字段
	 * @param filePath
	 * @param map
	 * @throws Exception
	 */
	private static void ReadTxt(String filePath,Map map) throws Exception{
         File file=new File(filePath);
         if(file.isFile() && file.exists()){ //判断文件是否存在
             InputStreamReader read = new InputStreamReader(new FileInputStream(file),encoding);//考虑到编码格式
             BufferedReader bufferedReader = new BufferedReader(read);
             String lineTxt = null;
             while((lineTxt = bufferedReader.readLine()) != null){
                map.put(lineTxt, "");
             }
             read.close();
         }
	}
	/**
	 * 把map的key拿出来 生成到文本中去
	 * @param map
	 * @param filePath
	 * @throws Exception
	 */
	private static void GenerateFile(Map<String,String> map,String filePath) throws Exception{
		   BufferedWriter bw= new BufferedWriter(new FileWriter(filePath));
		   StringBuffer sb = new StringBuffer();
		   for (Map.Entry<String,String> entry : map.entrySet()) {  
			   sb.append(entry.getKey() + n);
		   }  
		   bw.append(sb.toString());
		   bw.flush();bw.close();
	}
}