Java在读取文件内容的时候,如何判断出空白行的操作

 import java.util.*; import java.util.Map.Entry; import java.io.*; public class choosePath { private static ArrayList arrayListOfChoosedPath=new ArrayList(); private static ArrayList arrayListOfMustThoughNode=new ArrayList(); private static ArrayList arrayListOfMustThoughEdge=new ArrayList(); private static ArrayList arrayListOfCanNotThoughEdge=new ArrayList(); private static int needOfNode; public static void main(String[] args) throws IOException { //sumCol变量用于记录数据集中边的数量 int sumCol=0; BufferedReader bfr2 = new BufferedReader(new FileReader( "C://Users//Administrator//Desktop//text//case.txt")); bfr2.readLine(); bfr2.readLine(); while(!bfr2.readLine().equals("")){ sumCol++; } System.out.println("tempcol="+sumCol); String tempMustThoughNode=null; while(!(tempMustThoughNode=bfr2.readLine()).equals("")){ System.out.println(tempMustThoughNode); arrayListOfMustThoughNode.add(tempMustThoughNode); } while(!(tempMustThoughNode=bfr2.readLine()).equals("")){ System.out.println(tempMustThoughNode); arrayListOfMustThoughEdge.add(tempMustThoughNode.split(" ")[0]); arrayListOfMustThoughEdge.add(tempMustThoughNode.split(" ")[1]); } while((tempMustThoughNode=bfr2.readLine())!=null){ System.out.println(tempMustThoughNode); arrayListOfCanNotThoughEdge.add(tempMustThoughNode.split(" ")[0]); arrayListOfCanNotThoughEdge.add(tempMustThoughNode.split(" ")[1]); } bfr2.close(); } }

 public static String txt2String(File file) { StringBuilder result = new StringBuilder(); try { BufferedReader br = new BufferedReader(new FileReader(file));//构造一个BufferedReader类来读取文件 String s = null; while ((s = br.readLine()) != null) {//使用readLine方法，一次读一行 result.append(System.lineSeparator() + s); } br.close(); } catch (Exception e) { e.printStackTrace(); } return result.toString(); } public static void main(String[] args) { File file = new File("C:\\Users\\Administrator\\Desktop\\文件名.txt"); String s = txt2String(file); String[] split = s.split("\\r?\\n"); for (String s1 : split) { if (s1.length() > 0) { String[] split1 = s1.split("\\s+"); for (String s2 : split1) { if (s2.length() > 0) { System.out.println(s2); } } } } }