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虐待尽量保持这个尽可能短:) 所以我有这个代码和它的功能是如此使用户指定的目录中的文件。这段代码的部分包括：如何检查特定字符前是否有字符串
- 找出甚至想让摆在首位
- 文件查找出来的文件名的用户（扫描仪，确保文件名具有扩展名）
- 查找用户指定的目录（扫描仪，检查目录用户输入是否有效，检查目录是否存在，如果不存在，则创建一个新目录）
- 使文件（鉴于该文件不存在）
我的问题在1和2中。
问题1：用户可以输入类似“.txt”的东西，并在实际情况下制作文件时，您需要输入实际名称。 （我做了一些检查，如果该文件有一个扩展也许类似的东西？）
问题2：不要while循环开始部分不退出...为什么...
CODE：
package filecreator;
import java.io.File;
import java.io.IOException;
import java.util.*;
public class FileCreator {
public static Scanner sc = new Scanner(System.in);
public static boolean success = false;
public static String filename;
public static String filedir;
public static String fileexten;
public static String filedir2;
public static File file;
public static File dir;
public static void main(String[] args) throws IOException {
System.out.println("********************************");
System.out.println("* Welcome to File Creator 2.0! *");
System.out.println("********************************");
System.out.println(" ");
//Starting prompt
while(!success) {
System.out.println("Would you like to create a file? Y/N?");
String usrans = sc.nextLine();
if(usrans.equalsIgnoreCase("y")) {
System.out.println("Proceeding with file creation...");
System.out.println(" ");
break;
} else if(usrans.equalsIgnoreCase("n")) {
System.out.println("Exiting Program...");
System.exit(0);
} else if(!usrans.equalsIgnoreCase("y") || !usrans.equalsIgnoreCase("n")) {
System.out.println("That is not a valid answer! Please try again!");
System.out.println(" ");
}
}
System.out.println("Please enter a valid file name:");
//choosing name of file
while(!success) {
filename = sc.nextLine();
fileexten = filename.substring(filename.lastIndexOf(".") + 1);
if(filename.isEmpty()) {
System.out.println("Please enter a file name!");
} else if(filename.contains("/") || filename.contains(":") ||
filename.contains("*") || filename.contains("?") ||
filename.contains("<") || filename.contains(">") ||
filename.contains("|") || filename.contains("\"") ||
filename.contains("\\")) {
System.out.println("Please do not include/\\ : * ? \" < > |");
} else if(!filename.contains(".")) {
System.out.println(" ");
System.out.println("Please specify a valid file extension!");
} else if (fileexten.isEmpty() || fileexten.contains("[^\\p{IsDigit}\\p{IsAlphabetic}]")) {
System.out.println(" ");
System.out.println("Please specify a valid file extension!");
} else {
System.out.println(" ");
System.out.println("File name \"" + filename + "\" chosen");
break;
}
}
System.out.println(" ");
System.out.println("Where would you like to have your file saved?");
System.out.println("Please enter a valid directory");
//finding directory if directory exists and creating one if it dosent
while(!success) {
filedir = sc.nextLine();
dir = new File(filedir);
do {
System.out.println(""
+ "That is not a valid directory");
filedir = sc.nextLine();
} while((!filedir.contains(":") && !filedir.contains("\\")));
System.out.println("Checking to see if directory exists...");
if(!dir.exists()) {
System.out.println("Directory does not exist! Would you like to create one? Y/N?");
String usrans = sc.nextLine();
if(usrans.equalsIgnoreCase("y")) {
dir = new File(filedir);
success = dir.createNewFile();
if(!success) {
System.out.println("Created!");
break;
} else {
System.out.println("Something went wrong! Aborting Program...");
System.exit(0);
}
} else if(usrans.equalsIgnoreCase("n")) {
System.out.println("Directory not created! Aborting program...");
System.exit(0);
} else if(!usrans.equalsIgnoreCase("y") || !usrans.equalsIgnoreCase("n")) {
System.out.println("That is not a valid answer!");
}
}
}
System.out.println(" ");
System.out.println("Looking to see if \"" + filename + "\" already exists...");
file = new File(filedir,filename);
if(file.exists()) {
System.out.println(" ");
System.out.println("\"" + filename + "\"" + " already exists! Closing Program...");
System.exit(0);
} else {
System.out.println(" ");
System.out.println("\"" + filename + "\"" + " doesn't exists! Creating now...");
file.createNewFile();
success = file.createNewFile();
if(!success) {
System.out.println(" ");
System.out.println("\"" + filename + "\"" + " successfully created!");
} else {
System.out.println(" ");
System.out.println("Error! File not created");
}
}
}
}
听起来像是你需要一个正则表达式 – MyStackRunnethOver
@MyStackRunnethOver可以PLZ详细点吗？ –
哪个循环不退出？你能发表一个你的输入的例子，以及重复哪些打印输出？ – Assafs