判断设备名称是否重复与自动生成设备名称

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/zhengTornado/article/details/82800163

@Autowired
	private HydrantQRCodeMapper hydrantQRCodeMapper;
	
	@Override
	public Integer insertHydrantQRCode(HydrantQRCodeEntity hydrantQRCodeEntity) {
		String hydrantName=hydrantQRCodeEntity.getHydrantName(); 
		//hydrantName 为null或者为“”时自动生成
		if(hydrantName.equals(null) || hydrantName.equals("")){
			Boolean flag=true;
			while(flag){
				hydrantName=CommonFunction.autoHydrantName(4);
				List<HydrantQRCodeEntity> list=hydrantQRCodeMapper.queryHydrantName(hydrantName);
				if(list.size()==0){// 消防设备名称没有出现重复
					hydrantQRCodeEntity.setHydrantName(hydrantName);
					flag=false; //结束循环
				}else{ //出现重复
					flag=true; //继续循环，直到不重复为止
				}
			}	
		}
		String hydrantNumber=hydrantQRCodeEntity.getHydrantNumber();
		if(hydrantNumber.equals(null) || hydrantNumber.equals("")){
			hydrantNumber=CommonUtil.strAutoInfo();
			hydrantQRCodeEntity.setHydrantNumber(hydrantNumber);
		}	
		hydrantQRCodeEntity.setCreateDate(new Date());//创建时间
		
		Integer iden=hydrantQRCodeMapper.insertHydrantQRCode(hydrantQRCodeEntity);
		System.out.println("iden=="+iden);
		return iden;
	}

##自动生成设备名称

package com.common.qr.util;

import java.util.Random;

/**
 * 自动生成名称类
 * @author Administrator
 *
 */
public class CommonFunction {
	
	/**
	 * 自动生成消防栓名称
	 * @param length
	 * @return
	 */
	public  static String  autoHydrantName(int length){	
		String prefix="消防栓_";
		String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
		//System.out.println(str.length());
		Random random=new Random();
	    StringBuffer sb=new StringBuffer();
	    for(int i=0;i<length;i++){
	       int number=random.nextInt(62);
	       sb.append(str.charAt(number));
	    }
	    return prefix+sb.toString();
	}
	
	public static void main(String[] args) {
		String str=CommonFunction.autoHydrantName(4);
		System.out.println(str);
	}
}

##自动生成设备编号

		/**
		 * 生成时间+UUID字符串
		 * @return
		 */
		public static String strAutoInfo() {
			String str=UUID.randomUUID().toString();
			str=str.substring(0,8);//从下标0开始，截取8位长度
			SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhMMss");
			Date d=new Date();
			String time=sdf.format(d);
			String strAutoInfo=time+str;
			return strAutoInfo;
		}