Question

我是java的新手，我正在尝试获取文件的内容，类型内容是

Nameofuser:DateOfBirth:Nationality

我想问用户要查找哪个名称，名称应搜索第一个字段，然后再次询问dob并获取结果。

   import java.io.File;
   import java.util.Scanner;

   public class ReadFile {

        public static void main(String[] args) {


            try {
                Scanner input = new Scanner(System.in);
                System.out.print("Enter the file name with extention : ");
                File file = new File(input.next());

                input = new Scanner(file);
                String newInput = input.nextLine();


                while (input.hasNext()) {
                    String line = input.next();
                    String delims = "[:]"; 
                    String[] tokens = line.split(delims);
                    System.out.println(tokens);


                }
                input.close();

            } catch (Exception ex) {
                ex.printStackTrace();
                System.out.print("Error Occured ");
            }

        }

    }

我如何展示搜索结果。

Answer 1

您需要获取目标名称和dob，然后尝试在while循环中找到该记录

import java.io.File;
import java.util.Scanner;

   public class ReadFile {

    public static void main(String[] args) {

        String dob="",name="";

        try {
            Scanner input = new Scanner(System.in);
            System.out.print("Enter the file name with extention : ");
            File file = new File(input.next());

            //get person name and dob to search for:
            System.out.print("Enter Person name : ");
            name = input.next();

            System.out.print("Enter Person DOB : ");
            dob = input.next();

            input = new Scanner(file);
            String newInput = input.nextLine();
            boolean found = false;

            while (input.hasNext()) {
                String line = input.next();
                String delims = "[:]"; 
                String[] tokens = line.split(delims);

                //check if this line matches target record
                if(tokens[0].equals(name) && tokens[1].equals(dob)){
                    System.out.println(String.format("Found Record, name: %s DOB: %s Nationality: %s",tokens[0],tokens[1],tokens[2]));
                    found=true;//mark as a record found
                    //no need to loop further
                    break;
                }
            }//while loop

            if(!found){
                System.out.println("No match records found!");
            }
            input.close();

        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.print("Error Occured ");
        }

    }

}

java读取文件并显示用户搜索

1 个答案: