PrintWriter只打印文本文件中的第一行

Question

     public boolean updatecentre(String row, int cuid) throws IOException
{
    boolean updated = false;
    int dbcuid;
    String dbcname, dbcentre, dba1, dba2, dba3, vac1, dose1, vac2, dose2, vac3, dose3, dbstr;
    
    File F1 = new File("Centre.txt");
    File Ftc1 = new File("Temp.txt");
    FileWriter fw1 = new FileWriter(Ftc1, true);
    BufferedWriter bw1 = new BufferedWriter(fw1);
    PrintWriter pw1 = new PrintWriter(bw1);
    Scanner Sc1 = new Scanner(F1);
    Sc1.useDelimiter("[/\n]");
    try
    {
        while(Sc1.hasNext())
        {
            dbcuid = Sc1.nextInt();
            dbcname = Sc1.next();
            dba1 = Sc1.next();
            dba2 = Sc1.next();
            dba3 = Sc1.next();
            vac1 = Sc1.next();
            dose1 = Sc1.next();
            vac2 = Sc1.next();
            dose2 = Sc1.next();
            vac3 = Sc1.next();
            dose3 = Sc1.next();
            dbstr = dbcuid+"/"+dbcname+"/"+dba1+"/"+dba2+"/"+dba3+"/"+vac1+"/"+dose1+"/"+vac2+"/"+dose2+"/"+vac3+"/"+dose3;
            if(dbcuid == cuid)
            {
                pw1.print(row +"\n");
                updated = true;
            }
            else
            {
                pw1.print(dbstr+"\n");
            }
        }
    }
    catch(Exception e)
    {
        
    }
    finally
    {
        Sc1.close();
        pw1.flush();
        pw1.close();
        bw1.close();
        fw1.close();
        F1.delete();
        File dump = new File("Centre.txt");
        Ftc1.renameTo(dump);  
    }
    return updated;
}

文本文件中的内容：

1/Axiata Arena Bukit Jalil/L2-E-10, Enterprise 4,/Technology Park Malaysia, Bukit Jalil,/57000, Kuala Lumpur/Pfizer-BioNTech/100/CoronaVac/50/AstraZeneca/25
2/Titiwangsa Stadium/Jalan Tembeling,/Titiwangsa,/53200, Kuala Lumpur/Pfizer-BioNTech/100/CoronaVac/50/AstraZeneca/25
3/Kompleks Sukan Pandamaran Klang/Padamaran,/Port Klang,/42000, Selangor/Pfizer-BioNTech/100/CoronaVac/50/AstraZeneca/25
4/KPL Ampang Puteri Hospital/1, Jalan Mamanda 9,/Taman Dato Ahmad Razali,/68000 Ampang, Selangor/Pfizer-BioNTech/100/CoronaVac/50/AstraZeneca/25
5/Mines Convention Centre/MIECC, Jalan Dulang,/Mines Wellness City, Seri Kembangan,/43300, Selangor/Pfizer-BioNTech/100/CoronaVac/50/AstraZeneca/25

Answer 1

用你的文件测试你的代码对我很有效。但是错误是您收到的信号表明您没有用scanner.nextint()读取整数。

我将用下面的代码片段测试您的完整文件。只是为了检查解析在哪里失败。解决这个问题。

String dbcuidStr = sc.next();

try
{
    System.out.println("This is the ID: " + dbcuidStr);
    dbcuid = Integer.parseInt(dbcuidStr);
}
catch (Exception e)
{
    System.out.println(dbcuidStr + " could not be parsed to an integer");
    
}

您可以始终使用scanner函数，如.hasnextint()。