批量生成11位电话号的java代码

package com.example.demo.test001;

import org.springframework.web.bind.annotation.*;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;



@RestController
@RequestMapping("/api/v2/myTest")
public class myTestController {
    public static String  last = "15";
    public int getNumber(String fileName){
        int number = 1;
        while(true){
            File file = new File("D://phoneNumber/" + fileName + number+".vcf");
            if(!file.exists()){
                break;
            }else{
                number++;
            }

        }
        return number;
    }
    @PostMapping(value="/Number",produces="application/json")
    public String  mySecondTest(@RequestBody List mid, @RequestParam String fileName){
        int number = 1;
        try {
            number = getNumber(fileName);
            BufferedWriter out = new BufferedWriter(new FileWriter("D://phoneNumber/" + fileName + number+".vcf"));
            StringBuilder phoneNumber = new StringBuilder();
            System.out.println(mid.size());
            java.text.DecimalFormat df=new java.text.DecimalFormat();
            df.applyPattern("00");
            int count = 1;
            for(int i = 0 ;i 
使用方法用postman