sap关账+策略模式（避免大量if elseif）

旧代码

    @Transactional(rollbackFor = Exception.class)public AjaxResult purchaseOrderReceiptOutSourceAfterSapCloseAccountingPeriod(Long id) {SysPurorderPostingLog sysPurorderPostingLog = sysPurorderPostingLogMapper.selectSysPurorderPostingLogById(id);if (Objects.isNull(sysPurorderPostingLog)) {throw new ServiceException("未找到过账日志信息");}if (SysConstants.SYS_SUCCESS.equals(sysPurorderPostingLog.getStatus())) {throw new ServiceException("该日志已成功过账, 禁止重复过账");}//根据不同类型补充过账if (InventoryOperation.PURCHASE_RECEIPT.getCode().equals(sysPurorderPostingLog.getInterfaceType())) {//采购订单return getPurchaseReceipt(sysPurorderPostingLog);} else if (InventoryOperation.TRANSFER_IN_SKIP.getCode().equals(sysPurorderPostingLog.getInterfaceType())) {//301预留AjaxResult ajaxResult = wmsFactoryTransferService.sapFactoryTransferOutSourcePosting(Long.valueOf(sysPurorderPostingLog.getOrderId()));if (ajaxResult.isSuccess()) {String requestJson = (String) ajaxResult.get("requestJson");String responseJson = (String) ajaxResult.get("responseJson");sysPurorderPostingLog.setOperParam(requestJson);sysPurorderPostingLog.setJsonResult(responseJson);sysPurorderPostingLog.setStatus(SysConstants.SYS_SUCCESS);sysPurorderPostingLog.setUpdateTime(new Date());sysPurorderPostingLogMapper.updateSysPurorderPostingLog(sysPurorderPostingLog);return AjaxResult.success("过账成功");}} else {throw new ServiceException("未知的过账类型");}return AjaxResult.error("过账失败");}

步骤
1.定义策略接口：创建一个接口，定义所有具体策略类必须实现的方法。

public interface PostingStrategy {AjaxResult executePosting(SysPurorderPostingLog sysPurorderPostingLog);
}

2.实现具体策略类：为每种过账类型实现具体的策略类。

2.1采购订单过账策略

public class PurchaseReceiptPostingStrategy implements PostingStrategy {@Overridepublic AjaxResult executePosting(SysPurorderPostingLog sysPurorderPostingLog) {// 具体的采购订单过账逻辑return getPurchaseReceipt(sysPurorderPostingLog); // 假设这个方法已经存在}
}

2.2 301预留过账策略

package com.kpl.sys.domain;import com.kpl.common.constant.SysConstants;
import com.kpl.common.core.domain.AjaxResult;
import com.kpl.sys.mapper.SysPurorderPostingLogMapper;
import com.kpl.sys.service.PostingStrategy;
import com.kpl.wms.service.impl.WmsFactoryTransferServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.util.Date;/*** 实现具体策略类：为每种过账类型实现具体的策略类 +  301预留*/
@Component
public class FactoryTransferPostingStrategy implements PostingStrategy {@Autowiredprivate WmsFactoryTransferServiceImpl wmsFactoryTransferService;@Autowiredprivate SysPurorderPostingLogMapper sysPurorderPostingLogMapper;@Overridepublic AjaxResult executePosting(SysPurorderPostingLog sysPurorderPostingLog) {AjaxResult ajaxResult = wmsFactoryTransferService.sapFactoryTransferOutSourcePosting(Long.valueOf(sysPurorderPostingLog.getOrderId()));if (ajaxResult.isSuccess()) {String requestJson = (String) ajaxResult.get("requestJson");String responseJson = (String) ajaxResult.get("responseJson");sysPurorderPostingLog.setOperParam(requestJson);sysPurorderPostingLog.setJsonResult(responseJson);sysPurorderPostingLog.setStatus(SysConstants.SYS_SUCCESS);sysPurorderPostingLog.setUpdateTime(new Date());sysPurorderPostingLogMapper.updateSysPurorderPostingLog(sysPurorderPostingLog);return AjaxResult.success("过账成功");}return AjaxResult.error("过账失败");}
}

3.上下文类：创建一个上下文类来管理策略对象，并提供设置和获取策略的方法。

package com.kpl.sys.domain;import com.kpl.common.core.domain.AjaxResult;
import com.kpl.common.exception.ServiceException;
import com.kpl.sys.service.PostingStrategy;
import lombok.Data;
import lombok.Setter;
import org.springframework.stereotype.Component;/*** 上下文类：创建一个上下文类来管理策略对象，并提供设置和获取策略的方法*/
@Setter
@Component
public class PostingContext {private PostingStrategy postingStrategy;public AjaxResult executePosting(SysPurorderPostingLog sysPurorderPostingLog) {if (postingStrategy == null) {throw new ServiceException("策略模式不存在!");}return postingStrategy.executePosting(sysPurorderPostingLog);}
}

4.重构原方法：使用上下文类来调用适当的策略。

    /*** 关账过账** @param id* @return*/@Override@Transactional(rollbackFor = Exception.class)public AjaxResult purchaseOrderReceiptOutSourceAfterSapCloseAccountingPeriod(Long id) {SysPurorderPostingLog sysPurorderPostingLog = sysPurorderPostingLogMapper.selectSysPurorderPostingLogById(id);if (Objects.isNull(sysPurorderPostingLog)) {throw new ServiceException("未找到过账日志信息");}if (SysConstants.SYS_SUCCESS.equals(sysPurorderPostingLog.getStatus())) {throw new ServiceException("该日志已成功过账, 禁止重复过账");}//使用策略模式PostingContext context = new PostingContext();PostingStrategy strategy = null;switch (sysPurorderPostingLog.getInterfaceType()) {case "101P":strategy = applicationContext.getBean(PurchaseReceiptPostingStrategy.class);break;case "301i":strategy = applicationContext.getBean(FactoryTransferPostingStrategy.class);break;default:throw new ServiceException("未知的过账类型");}context.setPostingStrategy(strategy);return context.executePosting(sysPurorderPostingLog);}