StringIndexOutOfBoundsException错误 [英] StringIndexOutOfBoundsException Error

问题描述

我想解析一个数字文件。我实现解析，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。

我的代码如下所示：

  public void fileParse（）throws IOException 
 {
 
 
 
文件f = new File（180214.txt）; 
文件f1 =新文件（salelog.txt）; 
 
 String s = null; 
 
 FileWriter fw = new FileWriter（f1）; 
 PrintWriter pw = new PrintWriter（fw）; 
 
 BufferedReader br = new BufferedReader（new FileReader（f））; $（$ s 
 
） '0'）
 {
 pw.println（< receipt>）; 
 pw.println（s）; 
继续; 
 
 if（s.charAt（0）=='8'）
 {
 pw.println（s）; 
 pw.println（< / receipt>）; 
继续; 
} 
 pw.println（s）; 
 
} 
 
 // br.close（）; 
 pw.close（）; 
 br1.close（）; 
 
 
 
 $ b code 
 $ b 
我的文件内容是这样的：
 
 $ $ $ $ $ $ c $ 001021402180000000000000000 
 4869359340051000000011001000000100000000000 
 58693593400510800000000008000 0 
 600000001100100 
 800300000001070002075700000001100000000008 
 001021402180000000000000000 
 4869697119156000000003001000000100000000000 
 58696971191560800000000002000 0 
 600000000300100 
 800500000001060002080000000000300000000002 
 001021402180000000000000000 
 4869069850477000000010001500000200000000000 
 58690698504770800000000015000 0 
 4000008691497000000012001500000100000000000 
 50000086914970800000000009000 0 
 4000004082260000000008001000000100000000000 
 50000040822600800000000006000 0 
 600000004000100 
 8 00500000001060003080100000004000000000030 
 001021402180000000000000000 
 4000008090548000000028501400000100000000000 
 50000080905480800000000021000 0 
 600000002850100 
 800500000001060004080900000002850000000021 
 001021402180000000000000000 
 4869088520157000000049501200000100000000000 
 58690885201571800000000076000 0 
 600000004950100 
 800500000001060005080900000004950000000076 
 001021402180000000000000000 
 4869749799821000000019501400000100000000000 
 58697497998210800000000014000 0 
 4869076767108000000049501500000100000000650 
 58690767671080800000000032000 0 
 986907676710801 $○○○○○○○○六五○○○○○一
 600000006250100 
 800500000001060006081200000006250000000046 
 001021402180000000000000000 
 497721462356100000000 7503200000100000000000 
 59772146235610000000000000000 0 
 600000000750100 
 800500000001060007081300000000750000000000 
  

解决方案

这里唯一可以引发 IndexOutOfBoundsException 的是

  s.charAt（0）
  

code。

这意味着在第一个位置的这一行没有空行。

在循环开始时尝试以下操作： / p>

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

I want to parse a numeric file. I achieve parsing but when I changed the file content, I get a StringIndexOutOfBoundsException. Any help will be appreciated.

My code is like below:

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("<receipt>");
                pw.println(s);
                continue;
            }
            if(s.charAt(0)=='8')
            {
                pw.println(s);
                pw.println("</receipt>");
                continue;
            }
            pw.println(s);

    }

//  br.close();
    pw.close();
    br1.close();

}

}

My file content is like this:

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 

解决方案

The only thing here, which can throw an IndexOutOfBoundsException is the

s.charAt(0)

code.

That means that in this line on the first position there is nothing = empty line.

Try the following in the beginning of your loop:

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

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