import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Random;

public class Pattern{

public static void main(String [] agrs) throws IOException{

　　File file = new File("D:\\testXml.txt");

　　if(!file.exists()){

　　try {

file.createNewFile();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

FileWriter writer;

try {

writer = new FileWriter(file);

for (int i = 0; i < 10000; i++) {

String payFlowId = "A"+getRandomString(14,"A");

String engineNo = "AWL"+getRandomString(3,"A")+getRandomString(1,"B")+getRandomString(5,"A");

String vehicleFrameNo = "LSV"+getRandomString(4,"A")+getRandomString(2,"B")+getRandomString(8,"A");

String licenseNo = "*";

System.out.println(licenseNo+","+vehicleFrameNo+","+engineNo+","+payFlowId);

writer.write(licenseNo+","+vehicleFrameNo+","+engineNo+","+payFlowId+"\n");// 写内容 

}

writer.flush();// 清空缓冲区，立即将输出流里的内容写到文件里

writer.close();// 关闭输出流，施放资源

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static String getRandomString(int length,String flg) { //length表示生成字符串的长度

String baseall = "ABCDEFGHJKLMNPRSTUVWXY0123456789";

String base = "ABCDEFGHJKLMNPRSTUVWXY";

String intbase = "0123456789";

Random random = new Random();

StringBuffer sb = new StringBuffer();

for (int i = 0; i < length; i++) {

int number;

if("A".equals(flg)){

number =    random.nextInt(intbase.length());

sb.append(intbase.charAt(number));

}

else if("B".equals(flg)){

number =    random.nextInt(base.length());

sb.append(base.charAt(number));

}else {

number = random.nextInt(baseall.length());

sb.append(baseall.charAt(number));

}

}

return sb.toString();

}

}