StringIndexOutOfBoundsException错误

我想解析一个数字文件。 我实现了解析，但是当我更改文件内容时，我得到一个StringIndexOutOfBoundsException。 任何帮助将不胜感激。

我的代码如下：

public void fileParse() throws IOException { File f = new File("180214.txt"); File f1 = new File("salelog.txt"); String s = null; FileWriter fw = new FileWriter(f1); PrintWriter pw = new PrintWriter(fw); BufferedReader br = new BufferedReader(new FileReader(f)); while((s=br.readLine())!=null) { if(s.charAt(0) == '0') { pw.println(""); pw.println(s); continue; } if(s.charAt(0)=='8') { pw.println(s); pw.println(""); continue; } pw.println(s); } // br.close(); pw.close(); br1.close(); } } 

我的文件内容是这样的：

 001021402180000000000000000 4869359340051000000011001000000100000000000 58693593400510800000000008000 0 600000001100100 800300000001070002075700000001100000000008 001021402180000000000000000 4869697119156000000003001000000100000000000 58696971191560800000000002000 0 600000000300100 800500000001060002080000000000300000000002 001021402180000000000000000 4869069850477000000010001500000200000000000 58690698504770800000000015000 0 4000008691497000000012001500000100000000000 50000086914970800000000009000 0 4000004082260000000008001000000100000000000 50000040822600800000000006000 0 600000004000100 800500000001060003080100000004000000000030 001021402180000000000000000 4000008090548000000028501400000100000000000 50000080905480800000000021000 0 600000002850100 800500000001060004080900000002850000000021 001021402180000000000000000 4869088520157000000049501200000100000000000 58690885201571800000000076000 0 600000004950100 800500000001060005080900000004950000000076 001021402180000000000000000 4869749799821000000019501400000100000000000 58697497998210800000000014000 0 4869076767108000000049501500000100000000650 58690767671080800000000032000 0 986907676710801$0000000065000001 600000006250100 800500000001060006081200000006250000000046 001021402180000000000000000 4977214623561000000007503200000100000000000 59772146235610000000000000000 0 600000000750100 800500000001060007081300000000750000000000 

Answer 1

这里唯一可以抛出IndexOutOfBoundsException是

 s.charAt(0) 

码。

这意味着在第一个位置的这一行中没有任何东西=空行。

在循环开始时尝试以下操作：

 if(s == null || s.trim().length() == 0) { System.out.println("Empty line found."); continue; }