req.getRequestDispatch

req.getRequestDispatcher() 是一个Servlet API的方法，它返回一个RequestDispatcher对象，该对象可以将请求转发到另一个Servlet或JSP页面。它的语法为：

RequestDispatcher rd = req.getRequestDispatcher("target.jsp");
rd.forward(req, resp);

在这个例子中，getRequestDispatcher() 方法将请求转发到名为 "target.jsp" 的JSP页面。这里的req和resp是HttpServletRequest和HttpServletResponse对象，它们分别表示当前正在处理的请求和响应。forward() 方法将请求转发到目标资源，而不像重定向那样将请求重定向到一个新的URL。

相关问题

memset(&Order, 0 , sizeof(Order)); // 将插入报单信息结构体转换成报单结构体，并传回 strcpy(Order.BrokerID, req.BrokerID); strcpy(Order.InvestorID, req.InvestorID); strcpy(Order.InstrumentID, req.InstrumentID); strcpy(Order.UserID, req.UserID); Order.OrderPriceType = req.OrderPriceType; Order.Direction = req.Direction; strcpy(Order.CombOffsetFlag, req.CombOffsetFlag); strcpy(Order.CombHedgeFlag, req.CombHedgeFlag); Order.LimitPrice = req.LimitPrice; Order.VolumeTotalOriginal = req.VolumeTotalOriginal; Order.TimeCondition = req.TimeCondition; strcpy(Order.GTDDate, req.GTDDate); Order.VolumeCondition = req.VolumeCondition; Order.MinVolume = req.MinVolume; Order.ContingentCondition = req.ContingentCondition; Order.StopPrice = req.StopPrice; Order.ForceCloseReason = req.ForceCloseReason; Order.IsAutoSuspend = req.IsAutoSuspend; strcpy(Order.BusinessUnit, req.BusinessUnit); Order.RequestID = req.RequestID; Order.UserForceClose = req.UserForceClose; Order.IsSwapOrder = req.IsSwapOrder; // 报单的唯一标识 strcpy(Order.OrderRef, req.OrderRef); Order.FrontID = frontId; Order.SessionID = sessionId; // 初始报单状态 Order.OrderStatus = MAN_TAOJIN_OST_Unknown; Order.OrderSubmitStatus = MAN_TAOJIN_OSS_InsertSubmitted;

这段代码是将一个插入报单信息的结构体转换成报单结构体，并将其传回。其中，memset函数用于将Order结构体的所有成员初始化为0。接下来，使用strcpy函数将结构体中的各个成员赋值为插入报单信息结构体中对应的成员值。最后，设置报单结构体的一些默认值，如OrderStatus和OrderSubmitStatus等。需要注意的是，OrderRef是报单的唯一标识，需要保证其唯一性。FrontID和SessionID是用于标识客户端的编号和会话编号，用于区分不同的客户端发出的报单请求。

XwAttrVo xwAttr = new XwAttrVo(); xwAttr.setAttrId(new BigDecimal(attrId)); xwAttr.setBusiTypeId(new BigDecimal(req.getBusiTypeId())); xwAttr.setParAttrId(new BigDecimal(req.getParAttrId())); xwAttr.setAttrNbr(req.getAttrNbr()); xwAttr.setAttrName(req.getAttrName()); xwAttr.setAttrDesc(req.getAttrDesc()); xwAttr.setDefaultValue(req.getDefaultValue()); xwAttr.setValueFrom(req.getValueFrom()); xwAttr.setValueTo(req.getValueTo()); xwAttr.setIsUnique(new BigDecimal(req.getIsUnique())); xwAttr.setIsNullable(new BigDecimal(req.getIsNullable())); xwAttr.setAttrValueDataType(req.getAttrValueDataType()); xwAttr.setIsDanyAttr(new BigDecimal(req.getIsDanyAttr())); xwAttr.setAttrValueType(req.getAttrValueType()); xwAttr.setAttrFormat(req.getAttrFormat()); xwAttr.setAttrLength(new BigDecimal(req.getAttrLength())); xwAttr.setStatusCd("1000"); xwAttr.setCreateStaff(new BigDecimal(req.getCreateStaff())); xwAttr.setUpdateStaff(new BigDecimal(req.getUpdateStaff())); xwAttr.setCreateDate(new Date()); xwAttr.setStatusDate(new Date()); xwAttr.setUpdateDate(new Date()); xwAttr.setRemark(req.getRemark()); xwAttr.setUnitCd(new BigDecimal(req.getUnitCd())); xwAttr.setExtAttrId(req.getExtAttrId()); xwAttr.setGrpAttrNbr(req.getGrpAttrNbr()); xwAttr.setShowFlag(new BigDecimal(req.getShowFlag())); xwAttr.setModFlag(new BigDecimal(req.getModFlag())); xwAttr.setFormatMsg(req.getFormatMsg()); xwAttr.setHasLinkCtrl(req.getHasLinkCtrl()); xwAttr.setPrivCode(req.getPrivCode()); xwAttr.setBusiObjNbr(req.getBusiObjNbr()); 使用 Java 8 的 Optional 类和流式操作来简化这段代码

使用 Java 8 的 Optional 类和流式操作可以简化这段代码。可以通过创建一个方法来处理属性的判空和转换，并使用流式操作将所有属性进行处理。以下是简化后的代码示例：

import java.math.BigDecimal;
import java.util.Date;
import java.util.Optional;

public class Main {
    public static void main(String[] args) {
        XwAttrVo xwAttr = new XwAttrVo();
        xwAttr.setAttrId(new BigDecimal(attrId));
        xwAttr.setBusiTypeId(Optional.ofNullable(req.getBusiTypeId()).map(BigDecimal::new).orElse(null));
        xwAttr.setParAttrId(Optional.ofNullable(req.getParAttrId()).map(BigDecimal::new).orElse(null));
        xwAttr.setAttrNbr(req.getAttrNbr());
        xwAttr.setAttrName(req.getAttrName());
        xwAttr.setAttrDesc(req.getAttrDesc());
        xwAttr.setDefaultValue(req.getDefaultValue());
        xwAttr.setValueFrom(req.getValueFrom());
        xwAttr.setValueTo(req.getValueTo());
        xwAttr.setIsUnique(Optional.ofNullable(req.getIsUnique()).map(BigDecimal::new).orElse(null));
        xwAttr.setIsNullable(Optional.ofNullable(req.getIsNullable()).map(BigDecimal::new).orElse(null));
        xwAttr.setAttrValueDataType(req.getAttrValueDataType());
        xwAttr.setIsDanyAttr(Optional.ofNullable(req.getIsDanyAttr()).map(BigDecimal::new).orElse(null));
        xwAttr.setAttrValueType(req.getAttrValueType());
        xwAttr.setAttrFormat(req.getAttrFormat());
        xwAttr.setAttrLength(Optional.ofNullable(req.getAttrLength()).map(BigDecimal::new).orElse(null));
        xwAttr.setStatusCd("1000");
        xwAttr.setCreateStaff(new BigDecimal(req.getCreateStaff()));
        xwAttr.setUpdateStaff(new BigDecimal(req.getUpdateStaff()));
        xwAttr.setCreateDate(new Date());
        xwAttr.setStatusDate(new Date());
        xwAttr.setUpdateDate(new Date());
        xwAttr.setRemark(req.getRemark());
        xwAttr.setUnitCd(Optional.ofNullable(req.getUnitCd()).map(BigDecimal::new).orElse(null));
        xwAttr.setExtAttrId(req.getExtAttrId());
        xwAttr.setGrpAttrNbr(req.getGrpAttrNbr());
        xwAttr.setShowFlag(Optional.ofNullable(req.getShowFlag()).map(BigDecimal::new).orElse(null));
        xwAttr.setModFlag(Optional.ofNullable(req.getModFlag()).map(BigDecimal::new).orElse(null));
        xwAttr.setFormatMsg(req.getFormatMsg());
        xwAttr.setHasLinkCtrl(req.getHasLinkCtrl());
        xwAttr.setPrivCode(req.getPrivCode());
        xwAttr.setBusiObjNbr(req.getBusiObjNbr());
    }
}

通过使用 `Optional` 类和流式操作，我们可以将属性的判空和转换逻辑封装起来，并且使用流式操作简化代码。将所有属性通过流式操作一一处理，可以避免重复的判空和转换代码，使代码更加简洁和易读。