spring结合设计模式之策略模式

策略模式基本概念：

• 一个接口或者抽象类，里面两个方法（一个方法匹配类型，一个可替换的逻辑实现方法）
• 不同策略的差异化实现(就是说，不同策略的实现类)

使用策略模式替换判断，使代码更加优雅。

实现：

package com.demo.service.sjms;

import com.demo.utils.Result;

import java.util.Map;


public interface InvoiceKj {

    Result service(Map param) ;
}

package com.demo.service.sjms;

import com.demo.utils.Result;
import com.demo.utils.ResultUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.util.Map;

@Slf4j
@Component("QDP-FP-10001")
public class InvoiceQdpFp10001  implements InvoiceKj {

    @Override
    public Result service(Map param)  {
        log.info("serviceid===>{}",param.get("serviceid"));
        log.info("蓝票申请");
        return ResultUtil.fail("不支持此开票类型！");
    }

}

package com.demo.service.sjms;

import com.demo.utils.Result;
import com.demo.utils.ResultUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.util.Map;

@Slf4j

@Component("QDP-FP-10002")
public class InvoiceQdpFp10002 implements InvoiceKj {

    @Override
    public Result service(Map param)  {
        log.info("serviceid===>{}",param.get("serviceid"));
        log.info("纸票待开号码查询");
        return ResultUtil.fail("不支持此开票类型！");
    }


}

package com.demo.service.sjms;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;


@Slf4j
@Component
public class InvoiceKjFactory {

    @Autowired
    Map<String, InvoiceKj> invoiceKjs = new ConcurrentHashMap<>(36);

    public InvoiceKj getInstance(String serviceid)  {
        InvoiceKj invoiceKj = invoiceKjs.get(serviceid);
        return invoiceKj;
    }
}

package com.demo.service.sjms;

import com.demo.utils.Result;

import javax.servlet.http.HttpServletRequest;


public interface InvoiceOpenApiService {

    /**
     *  发票业务
     * @param request
     * @return
     */
    Result<String> service(String serviceid, HttpServletRequest request);
}

package com.demo.service.sjms;

import cn.hutool.json.JSONObject;
import com.demo.utils.Result;
import com.demo.utils.ResultUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletRequest;


@Slf4j
@Service("invoiceOpenApiService")
public class InvoiceOpenApiServiceImpl  implements InvoiceOpenApiService {

    @Autowired
    private InvoiceKjFactory invoiceKjFactory;

    public Result<String> service(String serviceid, HttpServletRequest request) {
        //1、处理请求参数
        log.info("==> 同步开票对外接口，请求参数：{}",serviceid);
        //3、校验应用及验签
        JSONObject json = new JSONObject();
        json.put("serviceid", serviceid);
        //5、分发调用业务接口
        Result ret = ResultUtil.success(invoiceKjFactory.getInstance(serviceid).service(json));
        return ret;
    }

}

调用

    @GetMapping("/invoiceOpenApiService")
    public Result bbb(String serviceid, HttpServletRequest request) {
        return invoiceOpenApiService.service(serviceid, request);
    }