public class UuidUtil {
private UuidUtil(){}
public static String getUuid(){
return UUID.randomUUID().toString().replace("-","");
}
/**
* 测试
*/
public static void main(String[] args) {
System.out.println(UuidUtil.getUuid());
System.out.println(UuidUtil.getUuid());
System.out.println(UuidUtil.getUuid());
System.out.println(UuidUtil.getUuid());
}
}
String main = UuidUtil.getUuid();
取得文件的格式名例如.jpg:String ext = fileName.substring(fileName.lastIndexOf("."));