SpringBoot-记录-用策略模式--实现微信小程序不同二维码扫码功能

港控/mmm° 2022-02-21 12:36 182阅读 0赞

Controller层

@RequestMapping("/storeRecharge")
    @RestController
    @Api(value="扫一扫二维码功能管理",description = "提供查询二维码是否正确")
    public class StoreRechargeController {
        private static Logger log = LoggerFactory.getLogger(LoginController.class);
    
        @Autowired
        private QrCodeContext qrCodeContext;
        
        @ApiOperation("获取二维码信息")
        @RequestMapping("/searchQrCodeIsTrue")
        public String searchQrCode(@RequestParam(value = "qrCode") String qrCode,
                                   @RequestParam(value = "istrue", defaultValue = "") String istrue,
                                   @RequestParam(value = "username", defaultValue = "") String username
    
        ){
            JSONObject jsonobject1 = JSONObject.parseObject(qrCode);
            String key = jsonobject1.getString("key");
            String value = jsonobject1.getString("value");
            JSONObject json = new JSONObject();
            try {
                if ("true".equals(istrue)){
                    String qc = qrCodeContext.QcCode(key, value, username);
                    json.put("key",key);
                    json.put("value",qc);
                    return json.toString();
                } else {
                    return qrCodeContext.SelectQcCode(key,value,username);
                }
            } catch (Exception e) {
                e.printStackTrace();
                log.info("@@=======>>>>二维码key不正确,获取不到对应的二维码策略类");
                json.put("msg","二维码格式不正确");
                json.put("state",0);
                return json.toString();
    
            }
    
        }

Service层 (策略类的上下文类)

package com.mise.dm.pattern.qrstrategy;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import java.util.Map;
    import java.util.concurrent.ConcurrentHashMap;
    
    @Service     // 注意这儿得是@Service
    public class QrCodeContext {
    	/*
        AutoWired一个
        Map<String, QrCodeStrategy> 
        就会在初始化的时候将所有的Strategy自动加载到Map中
        而使用ConcurrentHashMap,是为了保证线程安全(虽然完全没有用到多线程...)
         */
        @Autowired
        Map<String, QrCodeStrategy> strategyMap = new ConcurrentHashMap<>();
    
        /**
         * 操作二维码
         * @param value
         * @param username
         * @return
         */
        public String QcCode(String key,String value,String username){
            return strategyMap.get(key).QcCode(value,username);
        }
    
        /**
         * 查询二维码信息
         * @param value
         * @param username
         * @return
         */
        public String SelectQcCode(String key,String value, String username){
            return strategyMap.get(key).SelectQcCode(value,username);
        }
    
    }

策略类1

/**
     * 优惠券策略
     */
    @Component("coupon")  //这儿是注入bean,  bean的名字就是引号里面的 ,比如这个就是: coupon
    public class CouponStrategy implements QrCodeStrategy{
    
    	...
    	
        public String QcCode(String value,String username) {
           //业务逻辑
        }
    
        public String SelectQcCode(String value,String username) {
        	//业务逻辑
        }
    }

策略类2

/**
     * 商品核实策略
     */
    @Component("pickGoods")
    public class PickGoodsStrategy implements QrCodeStrategy {
    		...
        /**
         * 处理二维码状态
         *
         * @param value
         * @return
         */
        public String QcCode(String value,String username) {      
       	 ...
        }
        /**
         * 查询二维码信息
         *
         * @param value
         * @return
         */
        public String SelectQcCode(String value,String username) {
    		...
        }
    }