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[英]How to create a .txt file within the java project folder and write to it
[英]How to create file in a project folder in Java?
在JsonOperation類中:
public void writeJson(String path, JSONObject passedJsonObj){
File file = new File(path);
try{
if (!file.exists()){
file.createNewFile();
}
FileWriter writer = new FileWriter(file);
writer.write(passedJsonObj.toJSONString());
writer.flush();
writer.close();
}catch(IOException e){
e.printStackTrace();
}
}
在我的主叫班上:
LocalDate todayDate = LocalDate.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
String dateString = todayDate.format(formatter).toString();
JsonOperation jsonOp = new JsonOperation();
jsonOp.writeJson("srcsample/SaveData.json", jsonOp.toJsonObj("dateToday", dateString) );
運行此程序時,出現以下錯誤:
java.io.IOException: The system cannot find the path specified
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(File.java:1012)
at sample.JsonOperation.writeJson(JsonOperation.java:50)
at sample.Main.saveData(Main.java:58)
at sample.Main.start(Main.java:29)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863)
at com.sun.javafx.application.LauncherImpl$$Lambda$52/384953125.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/113087735.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$50/949297714.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$49/59984698.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$38/665838427.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
當我改變
jsonOp.writeJson("\\src\\sample\\SaveData.json", jsonOp.toJsonObj("dateToday", dateString) );
進入
jsonOp.writeJson("SaveData.json", jsonOp.toJsonObj("dateToday", dateString) );
它不會給我任何錯誤,但是會在src文件夾之外創建文件。 如何在示例文件夾中創建文件?
我的項目層次結構: WordToday>src>sample
在我的項目中,我使用文件定義在src文件夾之外創建了一個“ logs”文件夾:
File file = new File("logs/file.txt");
因此,我希望您可以使用File(“ / file.txt”)在此處創建文件
嘗試使用匹配路徑。 當您使用相對路徑時,不會在您認為是的文件夾內創建文件。
您可以嘗試以下方法檢查相對路徑在哪里:
Path currentRelativePath = Paths.get("");
String s = currentRelativePath.toAbsolutePath().toString();
System.out.println("Current relative path is: " + s);
試試看,讓我知道。
編輯:有關更多信息,請參見此: http : //docs.oracle.com/javase/tutorial/essential/io/pathOps.html
用於在任何文件夾中創建
File file = new File("C:\\\\Users\\\\YourUserName\\\\Directory\\\\fileName.txt");
對於項目目錄
File = new File("directory/fileName.txt");
檢查文件是否存在,如果不存在則創建新文件
if (!file.exists()) { file.createNewFile(); }
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