XML SAX 处理程序中的逻辑 Java 帮助答案

【问题标题】：Java Help with Logic in XML SAX HandlerXML SAX 处理程序中的逻辑 Java 帮助
【发布时间】：2010-12-01 04:04:12
【问题描述】：

我正在尝试设置一个 SAX 处理程序来解析具有以下结构的 XML：

<Hours>
  <Set name="BUSINESS">
        <MO>
              <Open>09:00:00</Open>
              <Close>17:00:00</Close>
        </MO>
        <TU>
              <Open>09:00:00</Open>
              <Close>17:00:00</Close>
        </TU>
        <WE>
              <Open>09:00:00</Open>
              <Close>17:00:00</Close>
        </WE>
        <TH>
              <Open>09:00:00</Open>
              <Close>17:00:00</Close>
        </TH>
        <FR>
              <Open>09:00:00</Open>
              <Close>17:00:00</Close>
        </FR>
        <SA/>
        <SU/>
  </Set>
  <Set name="LASTCOLLECTION">
        <MO>
              <Close>17:00:00</Close>
        </MO>
        <TU>
              <Close>17:00:00</Close>
        </TU>
        <WE>
              <Close>17:00:00</Close>
        </WE>
        <TH>
              <Close>17:00:00</Close>
        </TH>
        <FR>
              <Close>17:00:00</Close>
        </FR>
        <SA/>
        <SU/>
  </Set>
 </Hours>

但是，我遇到了一些问题。我的代码只会在 MO 中真正获得 OPEN 和 CLOSE 的值，而不是在一周中的任何其他日子。谁能找到我的逻辑缺陷？这是我的处理程序代码：

public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {

    if (localName.equalsIgnoreCase("Set")
            && attributes.getValue("name").equalsIgnoreCase(
                    "BUSINESS")) {
        inBusiness = true;
    } else if (localName.equalsIgnoreCase("Set")
            && attributes.getValue("name").equalsIgnoreCase(
                    "LASTCOLLECTION")) {
        inLastCollection = true;
    } else if (localName.equalsIgnoreCase("MO")) {
        inMonday = true;
    } else if (localName.equalsIgnoreCase("TU")) {
        inTuesday = true;
    } else if (localName.equalsIgnoreCase("WE")) {
        inWednesday = true;
    } else if (localName.equalsIgnoreCase("TH")) {
        inThursday = true;
    } else if (localName.equalsIgnoreCase("FR")) {
        inFriday = true;
    } else if (localName.equalsIgnoreCase("SA")) {
        inSaturday = true;
    } else if (localName.equalsIgnoreCase("SU")) {
        inSunday = true;
    } else if (localName.equalsIgnoreCase("Open")) {
        inOpen = true;
    } else if (localName.equalsIgnoreCase("Close")) {
        inClose = true;
    }

}

public void characters(char ch[], int start, int length)
        throws SAXException {

    value = value + new String(ch, start, length).trim();

}

public void endElement(String uri, String name, String qName)
        throws SAXException {

    if (inBusiness) {

        bHours = new BusinessHours();

        if (inMonday) {

            if (inOpen) {
                bHours.setMondayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setMondayClose(value);
                inClose = false;
            }
            inMonday = false;

        } else if (inTuesday) {
            if (inOpen) {
                bHours.setTuesdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setTuesdayClose(value);
                inClose = false;
            }
            inTuesday = false;
        } else if (inWednesday) {
            if (inOpen) {
                bHours.setWednesdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setWednesdayClose(value);
                inClose = false;
            }
            inWednesday = false;
        } else if (inThursday) {
            if (inOpen) {
                bHours.setThursdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setThursdayClose(value);
                inClose = false;
            }
            inThursday = false;
        } else if (inFriday) {
            if (inOpen) {
                bHours.setFridayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setFridayClose(value);
                inClose = false;
            }
            inFriday = false;
        } else if (inSaturday) {
            if (inOpen) {
                bHours.setSaturdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setSaturdayClose(value);
                inClose = false;
            }
            inSaturday = false;
        } else if (inSunday) {
            if (inOpen) {
                bHours.setSundayOpen(value);
                inOpen = false;
            } else if (inClose) {
                bHours.setSundayClose(value);
                inClose = false;
            }
            inSunday = false;

        }
        myLoc.setBusinessHours(bHours);
        inBusiness = false;
    } else if (inLastCollection) {

        cHours = new LastCollectionHours();

        if (inMonday) {

            if (inOpen) {
                cHours.setMondayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setMondayClose(value);
                inClose = false;
            }
            inMonday = false;

        } else if (inTuesday) {
            if (inOpen) {
                cHours.setTuesdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setTuesdayClose(value);
                inClose = false;
            }
            inTuesday = false;
        } else if (inWednesday) {
            if (inOpen) {
                cHours.setWednesdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setWednesdayClose(value);
                inClose = false;
            }
            inWednesday = false;
        } else if (inThursday) {
            if (inOpen) {
                cHours.setThursdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setThursdayClose(value);
                inClose = false;
            }
            inThursday = false;
        } else if (inFriday) {
            if (inOpen) {
                cHours.setFridayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setFridayClose(value);
                inClose = false;
            }
            inFriday = false;
        } else if (inSaturday) {
            if (inOpen) {
                cHours.setSaturdayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setSaturdayClose(value);
                inClose = false;
            }
            inSaturday = false;
        } else if (inSunday) {
            if (inOpen) {
                cHours.setSundayOpen(value);
                inOpen = false;
            } else if (inClose) {
                cHours.setSundayClose(value);
                inClose = false;
            }
            inSunday = false;

        }
        myLoc.setLastCollectionHours(cHours);
        inLastCollection = false;
    }

}

更新代码：

public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {

    value = new String();

    if (localName.equalsIgnoreCase("Set")
            && attributes.getValue("name").equalsIgnoreCase("BUSINESS")) {
        currentElement = 1;
        bHours = new BusinessHours();

    } else if (localName.equalsIgnoreCase("Set")
            && attributes.getValue("name").equalsIgnoreCase(
                    "LASTCOLLECTION")) {
        currentElement = 2;
        cHours = new LastCollectionHours();
    } else if (localName.equalsIgnoreCase("MO")) {
        day = 1;
    } else if (localName.equalsIgnoreCase("TU")) {
        day = 2;
    } else if (localName.equalsIgnoreCase("WE")) {
        day = 3;
    } else if (localName.equalsIgnoreCase("TH")) {
        day = 4;
    } else if (localName.equalsIgnoreCase("FR")) {
        day = 5;
    } else if (localName.equalsIgnoreCase("SA")) {
        day = 6;
    } else if (localName.equalsIgnoreCase("SU")) {
        day = 7;
    } else if (localName.equalsIgnoreCase("Open")) {
        open = 1;
    } else if (localName.equalsIgnoreCase("Close")) {
        open = 2;
    }

}

public void characters(char ch[], int start, int length)
        throws SAXException {

    value = value + new String(ch, start, length).trim();

} // end Method Characters

public void endElement(String uri, String name, String qName)
        throws SAXException {

    if (name.equalsIgnoreCase("Set") && currentElement == 1) {
        myLoc.setBusinessHours(bHours);
    } else if (name.equalsIgnoreCase("Set") && currentElement == 2) {
        myLoc.setLastCollectionHours(cHours);

    }

    if (currentElement == 1) {

        if (day == 1) {

            if (open == 1) {
                bHours.setMondayOpen(value);
            } else if (open == 2) {
                bHours.setMondayClose(value);
            }

        } else if (day == 2) {

            if (open == 1) {
                bHours.setTuesdayOpen(value);
            } else if (open == 2) {
                bHours.setTuesdayClose(value);
            }
        } else if (day == 3) {

            if (open == 1) {
                bHours.setWednesdayOpen(value);
            } else if (open == 2) {
                bHours.setWednesdayClose(value);
            }
        } else if (day == 4) {

            if (open == 1) {
                bHours.setThursdayOpen(value);
            } else if (open == 2) {
                bHours.setThursdayClose(value);
            }
        } else if (day == 5) {

            if (open == 1) {
                bHours.setFridayOpen(value);
            } else if (open == 2) {
                bHours.setFridayClose(value);
            }
        } else if (day == 6) {

            if (open == 1) {
                bHours.setSaturdayOpen(value);
            } else if (open == 2) {
                bHours.setSaturdayClose(value);
            }
        } else if (day == 7) {

            if (open == 1) {
                bHours.setSundayOpen(value);
            } else if (open == 2) {
                bHours.setSundayClose(value);
            }

        }

    } else if (currentElement == 2) {

        if (day == 1) {

            if (open == 1) {
                cHours.setMondayOpen(value);
            } else if (open == 2) {
                cHours.setMondayClose(value);
            }

        } else if (day == 2) {

            if (open == 1) {
                cHours.setTuesdayOpen(value);
            } else if (open == 2) {
                cHours.setTuesdayClose(value);
            }
        } else if (day == 3) {

            if (open == 1) {
                cHours.setWednesdayOpen(value);
            } else if (open == 2) {
                cHours.setWednesdayClose(value);
            }
        } else if (day == 4) {

            if (open == 1) {
                cHours.setThursdayOpen(value);
            } else if (open == 2) {
                cHours.setThursdayClose(value);
            }
        } else if (day == 5) {

            if (open == 1) {
                cHours.setFridayOpen(value);
            } else if (open == 2) {
                cHours.setFridayClose(value);
            }
        } else if (day == 6) {

            if (open == 1) {
                cHours.setSaturdayOpen(value);
            } else if (open == 2) {
                cHours.setSaturdayClose(value);
            }
        } else if (day == 7) {

            if (open == 1) {
                cHours.setSundayOpen(value);
            } else if (open == 2) {
                cHours.setSundayClose(value);
            }

        }

    }

}

谢谢！

【问题讨论】：

标签： java xml parsing sax handler

【解决方案1】：

在第 116 行，您正在设置 inBusiness = false - 这将在 星期一 打开/关闭后设置。下次它在第 44 行的 if(inBusiness) 失败。

不使用 inBusiness 布尔值，而是使用 int 指示符，如下所示：

private int curElement = 0;

public void startElement(String uri, String localName, String qName, 属性属性）抛出 SAXException {

if (localName.equalsIgnoreCase("Set")
        && attributes.getValue("name").equalsIgnoreCase(
                "BUSINESS")) {
    curElement = 1;
} else if (localName.equalsIgnoreCase("Set")
        && attributes.getValue("name").equalsIgnoreCase(
                "LASTCOLLECTION")) {
    curElement = 2;
}

......

}

public void endElement(String uri, String name, String qName) 抛出 SAXException {

if (curElement == 1) {

    ....
    //Remove inBusiness= false;
} else if (curElement == 2) {
    ...
    //Remove inLastCollection = false;
}

}

【讨论】：

我不确定我是否完全理解 - 那么我应该如何区分我是在 BUSINESS 内部还是在 LASTCOLLECTION 内部？我设置 inBusiness = false 的唯一地方是所有处理工作日的 if 语句......
inBusiness = false 在任何一天被执行，不仅在 if(isSunday)
感谢您的澄清，我现在明白您的意思了。我将代码更改为使用 int，但是现在我在之后检查向量后所有时间都收到空值...
输出具有以下模式（带有我的 println 语句）IN BUSINESS，IN MONDAY，IN BUSINESS，IN BUSINESS，IN BUSINESS，IN BUSINESS，IN BUSINESS，IN TUESDAY，IN BUSINESS，IN BUSINESS，在商务中，在商务中，在商务中，在星期三，等等。
可能是您每天都在设置 bHours = new BusinessHours() 吗？ myLoc.setBusinessHours 做什么？你能把整个代码贴出来吗？