Java通过IO流输入输出 向文件中存入大量三个属性的值，并通过验证前两个属性输出第三个属性

 package ABC1;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.Random;

 public class Filetest {

     public static void main(String[] args) {
         // TODO 自动生成的方法存根

         try {
             File file =new File("D:/textFile.txt");
             if(!file.exists())
             {
                 file.createNewFile();
             }
             FileWriter out = new FileWriter(file);
             //往文件写入
             out.write("userid\tpassword\tusername"+"\r\n");
             //换行
             out.write("23213\t66yy\t解饿"+"\r\n");
             for(int j=0;j<100000;j++){
             int userid = randomInt();
             int password = randomInt();
             int username = randomInt();
             out.write(userid+"\t"+password+"\t"+username+"\r\n");
             }
             out.write("2321sdf3\t6fgds6yy\t好就是解饿"+"\r\n");
             //刷新IO内存流
             out.flush();
             out.close();
             //关闭
             String temp=null;
             int i =1;
             BufferedReader in=new BufferedReader(new FileReader(file));
             String rtn ="userid不正确" ;
             while((temp=in.readLine())!=null)
             {

                 if(temp.indexOf("451080121")!=-1)
                 {

                     String[] check = temp.split("\t");

                     if(check[1].equals("805786460"))
                     {
                         rtn="username="+check[2];
                     }
                     else
                     {
                         rtn="密码错误";
                         //System.out.println("密码错误");
                     }
                 }
             }
             System.out.println(rtn);

         } catch (IOException e) {
             // TODO 自动生成的 catch 块
             e.printStackTrace();
         }
     }

 public static int randomInt()
 {
     int rtn =0;
     Random random = new Random();
     rtn=random.nextInt(999999999)+10000;
     return rtn;
 }
 }