读文件合并行

 public String readerFile(String filePath) {
  StringBuffer sb = new StringBuffer();
  File f = new File(filePath);
  if (f.exists()) {
   try {
    // 下为读取文件
    BufferedReader raf = new BufferedReader(
      new FileReader(filePath));
    String line = "";
    int i=0;
    while ((line = raf.readLine()) != null) {
                   
     if (line.trim().length() > 0) {
      
      if(i<2||(i%2)!=0)
      {
      sb.append(line + "/r/n");
      }
      else
      {
       sb.append(line);
      }
     }
     i++;
    }
    raf.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
  String b = sb.toString();
//  b = b.substring(0, b.length() - 2);
  return b;
 }