Question

我正在尝试使用 fileWriter * 将文本数据写入文本文件，但程序创建的文件中没有任何内容... *我可以使用其他文件写入文件的方法，但没有一个对我有用......（对我来说，如何完成它并不重要，只要它有效。）

我在下面添加了我的代码片段，这是CommandInterpretation类中唯一重要的方法。

    private static FileWriter writer; //initialized outside so as to last through multiple calls

//Main area, processes the input fed from the user.
public String processInput(String theInput) {
    try {
        String theOutput = null;
        writer = new FileWriter("Default.txt",true); //initialized to a random file, otherwise it doesn't compile as I may have tried to close it without initializing
        if (state == ORIGINAL) {
            theOutput = "Hello, Master.";
            state = PROCESSCMDS;
        } else if (state == PROCESSCMDS) {
            if (theInput.split(" ")[0].equalsIgnoreCase("save")) {
                writer.close();
                writer = new FileWriter(theInput.split(" ")[1],true);
                theOutput = "Created new file: what's in it? (eof to end)";
                state = WRITEFILE;
            } else if (theInput.split(" ")[0].equalsIgnoreCase("run")) {
                Runtime.getRuntime().exec("cmd /c start " + theInput.split(" ")[1]);
                theOutput = "Successfully executed " + theInput.split(" ")[1] + ".";
            } else if (theInput.split(" ")[0].equalsIgnoreCase("close")) {
                state = ENDPROCESS;
            }
        } else if (state == WRITEFILE) { //file line input
            if (theInput.equalsIgnoreCase("eof")) {
                writer.close();
                theOutput = "File closed.";
                state = PROCESSCMDS;
            } else {
                writer.write(theInput);
                writer.write("\r\n");
                theOutput = "Next Line: ";
            }
        } 
        if (state == ENDPROCESS) {
            theOutput = "Bye.";
            state = ORIGINAL;
        }
        if (theOutput == null)
            return "Command not recognized.";
        return theOutput;
    } catch (Exception e) {return "Something went wrong: " + e.getMessage();}
}

我试着寻找答案，但我能找到的只是一堆类似的问题，人们忘了关闭（）他们的文件。

在我的输出中，我看到“文件已关闭。”，所以它必须运行代码的那一部分......即使如此，文件仍为空...

总之，问题是fileWriter正在创建一个名为I assign it的文件，但该文件为空。 Default.txt已创建且为空，这很好，但是创建了输入.split（“”）1并且也是空的。我感谢你们能给我的任何帮助！

提前致谢。

根据请求，使用下面的简单方法调用一些示例：

import java.util.*;

public class test
{
    //tester for other program
    public static void main(String[] args) {
        System.out.println("Starting...");
        CommandInterpretation ci = new CommandInterpretation();
        Scanner in = new Scanner( System.in );
        while (true)
            System.out.println(ci.processInput(in.nextLine()));
        }
}

...和here's the output.

FileWriter创建一个文件，但是将其留空？

0 个答案: