Java 在块中分割文本文件
我试图读取一个文本文件并将其划分为块。以下是输入文本文件的模式:Java 在块中分割文本文件,java,collections,Java,Collections,我试图读取一个文本文件并将其划分为块。以下是输入文本文件的模式: DEFINE JOBSET ID=jobset_def FAILCOND=(1,9999) DEFINE JOB ID=(jobset_def,job1_def,0010) DESCRIPTION='Checks the data file against the token file' DEFINE JOBPARM ID=(jobset_def,job1_def,0010) SUBFILE=/scripts/chk_file
DEFINE JOBSET ID=jobset_def FAILCOND=(1,9999)
DEFINE JOB ID=(jobset_def,job1_def,0010)
DESCRIPTION='Checks the data file against the token file'
DEFINE JOBPARM ID=(jobset_def,job1_def,0010) SUBFILE=/scripts/chk_file.ksh SUBUSER=pbods SUBPASS=*PASSWORD*
PARM1='parm1'
PARM2='parm2.dat'
DEFINE JOB ID=(jobset_def,job2_def,0030)
DEFINE JOBPARM ID=(jobset_def,job2_def,0030)
SUBFILE='exec_sess_instance.ksh' SUBUSER=pbods SUBPASS=*PASSWORD*
PARM1='parm1'
PARM2='parm2'
.......
我想将文本文件分成更小的块,并将其存储到HashMap中。HashMap的每个值都将是作业定义,即从定义作业ID到下一个定义作业ID。下面是我的代码:
public class UpdateJobs {
public static void main(String[] args) throws IOException {
File file = new File("H:/Project_Documents/ALM/ns_pbds_gwm_uscore_account_omx.txt");
FileReader fileReader = new FileReader(file);
HashMap <Integer, StringBuffer> jobdef= new HashMap <Integer, StringBuffer>();
int i=1;
BufferedReader bufferedReader = new BufferedReader(fileReader);
StringBuffer stringBuffer = new StringBuffer();
Iterator<Integer> keySetIterator = jobdef.keySet().iterator();
String line;
while ((line = bufferedReader.readLine()) != null) {
if (line.contains("DEFINE JOB ID")){
jobdef.put(i, stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(line);
//System.out.println("Line is" +line);
stringBuffer.append("\n");
}
fileReader.close();
while(keySetIterator.hasNext()){
Integer key = keySetIterator.next();
System.out.println("key: " + key + " value: " + jobdef.get(key));
}
}
}
在循环结束时,它在第二个while循环中不打印任何内容,即删除HashMap中的所有条目
我无法调试它,在过去的两天里一直坚持这个。我们将不胜感激
请让我知道,如果你需要更多的澄清
谢谢我认为这是因为您将
StringBuffer
对象本身作为一个值放入HashMap
中,并且由于它是一个对象
,所以无论何时何地访问它,代码都指向内存中的同一区域。这意味着当您将stringBuffer
放入HashMap
并随后更改其内容时,HashMap
中的内容也会更改
一个快速修复方法是在每次读取行中的“DEFINE JOB ID”时实例化一个new StringBuffer()
对象
这意味着改变这一点:
StringBuffer stringBuffer = new StringBuffer();
Iterator<Integer> keySetIterator = jobdef.keySet().iterator();
String line;
while ((line = bufferedReader.readLine()) != null) {
if (line.contains("DEFINE JOB ID")){
jobdef.put(i, stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(line);
//System.out.println("Line is" +line);
stringBuffer.append("\n");
}
StringBuffer StringBuffer=新的StringBuffer();
迭代器keySetIterator=jobdef.keySet().Iterator();
弦线;
而((line=bufferedReader.readLine())!=null){
if(第行包含(“定义作业ID”)){
jobdef.put(i,stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(行);
//System.out.println(“行为”+行);
stringBuffer.append(“\n”);
}
为此:
StringBuffer stringBuffer = new StringBuffer();
Iterator<Integer> keySetIterator = jobdef.keySet().iterator();
String line;
while ((line = bufferedReader.readLine()) != null) {
if (line.contains("DEFINE JOB ID")){
stringBuffer = new StringBuffer();
jobdef.put(i, stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(line);
//System.out.println("Line is" +line);
stringBuffer.append("\n");
}
StringBuffer StringBuffer=新的StringBuffer();
迭代器keySetIterator=jobdef.keySet().Iterator();
弦线;
而((line=bufferedReader.readLine())!=null){
if(第行包含(“定义作业ID”)){
stringBuffer=新的stringBuffer();
jobdef.put(i,stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(行);
//System.out.println(“行为”+行);
stringBuffer.append(“\n”);
}
希望这能有所帮助。谢谢您抽出时间。您提供的代码在
stringBuffer.append(line)
I更改了代码时出现空点异常。导致NullPointerException的原因是文本文件不是以“DEFINE JOB ID”开头的,这使得代码试图附加到尚未实例化的StringBuffer。感谢@TheHuyHoDreams的评论。更改后的代码也不起作用,但是您共享的逻辑/概念帮助我进行了更改,现在我有了工作代码if(line.contains(“DEFINE JOB ID”){StringBuffer sb=newstringbuffer(StringBuffer);jobdef.put(i,sb);i++;StringBuffer.setLength(0);}
StringBuffer stringBuffer = new StringBuffer();
Iterator<Integer> keySetIterator = jobdef.keySet().iterator();
String line;
while ((line = bufferedReader.readLine()) != null) {
if (line.contains("DEFINE JOB ID")){
stringBuffer = new StringBuffer();
jobdef.put(i, stringBuffer);
i++;
stringBuffer.setLength(0);
}
stringBuffer.append(line);
//System.out.println("Line is" +line);
stringBuffer.append("\n");
}