[英]PrintWriter on Multiple If Else Statement
我有一個可以在控制台上正常打印的工作程序。 但是,如果要在輸出文件中打印它,我會遇到麻煩。 它僅執行Else語句。 它不會進入If and Else語句中。
public void processFile()
{
final String IN = "IN";
final String OUT = "OUT";
final String CLOSE = "CLOSE";
PrintWriter fileOut;
final String FILE_NAME_IN = "Events.txt";
final String FILE_NAME_OUT = "SystemLog.txt";
BufferedReader fileIn;
String inputLine;
try
{
// print out initial state
fileOut = new PrintWriter(new FileWriter(FILE_NAME_OUT));
System.out.println("---------");
fileOut.println("---------");
System.out.println("INCOMING PROCESS");
fileOut.println("INCOMING PROCESS");
System.out.println(list.toString());
fileOut.println(list.toString());
System.out.println("OUTGOING PROCESS");
fileOut.println("OUTGOING PROCESS");
System.out.println(queue.toString());
fileOut.println(queue.toString());
fileOut.close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
try
{
// instantiate reader and grab the first line
fileIn = new BufferedReader(new FileReader(FILE_NAME_IN));
inputLine = fileIn.readLine();
// While we still have events to process...
while(inputLine != null)
{
String [] tokens = inputLine.split(" "); // read and tokenize line from text file
if(tokens[0].equals(IN))
{
try
{
fileOut = new PrintWriter(new FileWriter(FILE_NAME_OUT));
System.out.println("\n---------");
fileOut.println("\n---------");
System.out.println(tokens[0] + " " + tokens[1]);
fileOut.println(tokens[0] + " " + tokens[1]);
System.out.println("---------");
fileOut.println("---------");
System.out.println("\n\n");
fileOut.println("\n\n");
// print status
System.out.println("INCOMING PROCESS");
fileOut.println("INCOMING PROCESS");
System.out.println(list.toString());
fileOut.println(list.toString());
System.out.println("OUTGOING PROCESS");
fileOut.println("OUTGOING PROCESS");
System.out.println(queue.toString());
fileOut.println(queue.toString());
fileOut.close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
else if(tokens[0].equals(OUT))
{
try
{
fileOut = new PrintWriter(new FileWriter(FILE_NAME_OUT));
System.out.println("\n---------");
fileOut.println("\n---------");
System.out.println(tokens[0] + " " + tokens[1]);
fileOut.println(tokens[0] + " " + tokens[1]);
System.out.println("---------");
fileOut.println("---------");
System.out.println("\n\n");
fileOut.println("\n\n");
// print status
System.out.println("INCOMING PROCESS");
fileOut.println("INCOMING PROCESS");
System.out.println(list.toString());
fileOut.println(list.toString());
System.out.println("OUTGOING PROCESS");
fileOut.println("OUTGOING PROCESS");
System.out.println(queue.toString());
fileOut.println(queue.toString());
fileOut.close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
else //CLOSE
{
try
{
fileOut = new PrintWriter(new FileWriter(FILE_NAME_OUT));
System.out.println("\n\n---------");
fileOut.println("\n\n---------");
System.out.println(tokens[0]);
fileOut.println(tokens[0]);
System.out.println("---------");
fileOut.println("---------");
System.out.println("\n\n");
fileOut.println("\n\n");
// print status
System.out.println("INCOMING PROCESS");
fileOut.println("INCOMING PROCESS");
System.out.println(list.toString());
fileOut.println(list.toString());
System.out.println("OUTGOING PROCESS");
fileOut.println("OUTGOING PROCESS");
System.out.println(queue.toString());
fileOut.println(queue.toString());
fileOut.close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
inputLine = fileIn.readLine(); // grab the next line
}
fileIn.close();
}
catch(IOException ioe)
{
System.out.println("Error: Could not read file.");
ioe.printStackTrace();
}
}
你誤會了。 問題是每個if / else塊都會創建一個新文件,因此程序結束后,您將看到的唯一輸出是final命令的輸出,該命令位於final else
塊中。
無需在每個if or else塊中打開和關閉文件。 首先將其打開,在需要時對其進行寫入,最后將其關閉。
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