阅读多个元素的XML

我正在从一个项目，需要从一个XML文件，它有childs和subchilds，我必须打印每年的信息（每个月与相应的日子）。阅读多个元素的XML

这是我的XML文件：

<?xml version="1.0"?> 
<Forecast> 
<year name="2016"> 
    <currentyear>2016</currentyear> 
    <month name="May"> 
     <currentmonth>May</currentmonth> 
     <day name="Monday"> 
      <currentday>Monday</currentday> 
      <date>22</date> 
      <temperature>29</temperature> 
      <weather>sunny</weather> 
      <humidity>30</humidity> 
     </day> 
     <day name="Tuesday"> 
      <currentday>Tuesday</currentday> 
      <date>23</date> 
      <temperature>31</temperature> 
      <weather>sunny</weather> 
      <humidity>40</humidity> 
     </day> 
     <day name="Wednesday"> 
      <currentday>Wednesday</currentday> 
      <date>24</date> 
      <temperature>24</temperature> 
      <weather>rainy</weather> 
      <humidity>60</humidity> 
     </day> 
     <day name="Thursday"> 
      <currentday>Thursday</currentday> 
      <date>25</date> 
      <temperature>33</temperature> 
      <weather>sunny</weather> 
      <humidity>30</humidity> 
     </day> 

    </month> 
    <month name="June"> 
     <currentmonth>June</currentmonth> 
     <day name="Monday"> 
      <currentday>Monday</currentday> 
      <date>13</date> 
      <temperature>34</temperature> 
      <weather>sunny</weather> 
      <humidity>30</humidity> 
     </day> 
     <day name="Tuesday"> 
      <currentday>Tuesday</currentday> 
      <date>14</date> 
      <temperature>37</temperature> 
      <weather>sunny</weather> 
      <humidity>25</humidity> 
     </day> 
     <day name="Wednesday"> 
      <currentday>Wednesday</currentday> 
      <date>15</date> 
      <temperature>36</temperature> 
      <weather>sunny</weather> 
      <humidity>20</humidity> 
     </day> 
     <day name="Thursday">> 
      <currentday>Thursday</currentday> 
      <date>16</date> 
      <temperature>39</temperature> 
      <weather>sunny</weather> 
      <humidity>15</humidity> 
     </day> 
    </month> 

</year>

和我有下面的Java代码：

try 
     { 
      DocumentBuilderFactory docBuild = DocumentBuilderFactory.newInstance(); 
      DocumentBuilder docBuilder = docBuild.newDocumentBuilder(); 
      Document doc = docBuilder.parse(new File("D:\\users\\Popa Andrei\\Java Workspace\\YearForecast\\forecast.xml")); 

      doc.getDocumentElement().normalize(); 
      System.out.println("Root element:"+doc.getDocumentElement().getNodeName()); 

      NodeList listYears = doc.getElementsByTagName("year"); 
      int totalYears = listYears.getLength(); 
      System.out.println("Total number of years:"+totalYears); 
      NodeList listMonths = doc.getElementsByTagName("month"); 
      int totalMonths = listMonths.getLength(); 
      System.out.println("Total number of months:"+totalMonths); 
      NodeList listDays = doc.getElementsByTagName("day"); 
      int totalDays = listDays.getLength(); 
      System.out.println("Total number of days:"+totalDays); 


      for(int i = 0;i<listYears.getLength();i++) 
      { 
       Node firstYear= listYears.item(i); 

       if(firstYear.getNodeType() == Node.ELEMENT_NODE) 
       { 
        Element firstYearElement = (Element)firstYear; 

        System.out.println("Year:"+firstYearElement.getElementsByTagName("currentyear").item(0).getTextContent()); 

        for(int j = 0;j<listMonths.getLength();j++) 
        { 
         Node firstMonth = listMonths.item(j); 

         if(firstMonth.getNodeType() == Node.ELEMENT_NODE) 
         { 
          Element firstMonthElement =(Element)firstMonth; 

          System.out.println("Month:"+firstMonthElement.getElementsByTagName("currentmonth").item(0).getTextContent()+"\n"); 

           for(int k = 0 ;k<listDays.getLength();k++) 
           { 
            Node firstDay = listDays.item(k); 

            if(firstDay.getNodeType() == Node.ELEMENT_NODE) 
            { 
             Element firstDayElement = (Element)firstDay; 

             System.out.println("Day:"+firstDayElement.getElementsByTagName("currentday").item(0).getTextContent()); 

             System.out.println("Date:"+firstDayElement.getElementsByTagName("date").item(0).getTextContent()); 

             System.out.println("Temperature:"+firstDayElement.getElementsByTagName("temperature").item(0).getTextContent()+" degrees"); 

             System.out.println("Weather:"+firstDayElement.getElementsByTagName("weather").item(0).getTextContent()); 

             System.out.println("Humidity:"+firstDayElement.getElementsByTagName("humidity").item(0).getTextContent()+"%"); 
            } 
            System.out.println("\n"); 

           } 
          } 


         } 
        } 
       } 


    }catch (SAXParseException err) { 
    System.out.println ("** Parsing error" + ", line " 
     + err.getLineNumber() + ", uri " + err.getSystemId()); 
    System.out.println(" " + err.getMessage()); 

    }catch (SAXException e) { 
    Exception x = e.getException(); 
    ((x == null) ? e : x).printStackTrace(); 

    }catch (Throwable t) { 
    t.printStackTrace(); 
    } 
    System.exit (0); 

    }

输出是这样的：

Root element:Forecast 
Total number of years:1 
Total number of months:2 
Total number of days:8 
Year:2016 
Month:May 

Day:Monday 
Date:22 
Temperature:29 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:23 
Temperature:31 degrees 
Weather:sunny 
Humidity:40% 


Day:Wednesday 
Date:24 
Temperature:24 degrees 
Weather:rainy 
Humidity:60% 


Day:Thursday 
Date:25 
Temperature:33 degrees 
Weather:sunny 
Humidity:30% 


Day:Monday 
Date:13 
Temperature:34 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:14 
Temperature:37 degrees 
Weather:sunny 
Humidity:25% 


Day:Wednesday 
Date:15 
Temperature:36 degrees 
Weather:sunny 
Humidity:20% 


Day:Thursday 
Date:16 
Temperature:39 degrees 
Weather:sunny 
Humidity:15% 


Month:June 

Day:Monday 
Date:22 
Temperature:29 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:23 
Temperature:31 degrees 
Weather:sunny 
Humidity:40% 


Day:Wednesday 
Date:24 
Temperature:24 degrees 
Weather:rainy 
Humidity:60% 


Day:Thursday 
Date:25 
Temperature:33 degrees 
Weather:sunny 
Humidity:30% 


Day:Monday 
Date:13 
Temperature:34 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:14 
Temperature:37 degrees 
Weather:sunny 
Humidity:25% 


Day:Wednesday 
Date:15 
Temperature:36 degrees 
Weather:sunny 
Humidity:20% 


Day:Thursday 
Date:16 
Temperature:39 degrees 
Weather:sunny 
Humidity:15%

问题我的输出应该是t他：

Root element:Forecast 
Total number of years:1 
Total number of months:2 
Total number of days:8 
Year:2016 
Month:May 

Day:Monday 
Date:22 
Temperature:29 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:23 
Temperature:31 degrees 
Weather:sunny 
Humidity:40% 


Day:Wednesday 
Date:24 
Temperature:24 degrees 
Weather:rainy 
Humidity:60% 


Day:Thursday 
Date:25 
Temperature:33 degrees 
Weather:sunny 
Humidity:30% 

Month:June 

Day:Monday 
Date:13 
Temperature:34 degrees 
Weather:sunny 
Humidity:30% 


Day:Tuesday 
Date:14 
Temperature:37 degrees 
Weather:sunny 
Humidity:25% 


Day:Wednesday 
Date:15 
Temperature:36 degrees 
Weather:sunny 
Humidity:20% 


Day:Thursday 
Date:16 
Temperature:39 degrees 
Weather:sunny 
Humidity:15%

有人可以帮我解决这个问题吗？

来源

2016-07-27 Andrei Sebastian

预期产出和实际产出有什么不同？它只是天气的数据（似乎你只需要晴天）是对的吗？ –

预期的产出是最后一个，代码每个月都增加所有的日子，所以对于5月份我有8天，当我只有4个相同的时间去了7月 –

这里正确的代码，谢谢@RamachandranGA

try 
    { 
    DocumentBuilderFactory docBuild = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder docBuilder = docBuild.newDocumentBuilder(); 
    Document doc = docBuilder.parse(new File("D:\\users\\Popa Andrei\\Java Workspace\\YearForecast\\forecast.xml")); 
    NodeList monthNodes = doc.getElementsByTagName("month"); 
    // monthNodes. 

    XPath xPath = XPathFactory.newInstance().newXPath(); 

    for (int i = 0; i < monthNodes.getLength(); i++) { 
     StringBuilder pathBuilder = new StringBuilder(); 
     pathBuilder.append("/Forecast/year/month[@name="); 
     pathBuilder.append("'"); 
     Element monthNode = (Element) monthNodes.item(i); 
     String month = monthNode.getAttribute("name"); 
     pathBuilder.append(month); 
     pathBuilder.append("']/day"); 

     NodeList monthWiseNodes = (NodeList) xPath.evaluate(pathBuilder.toString(), doc.getDocumentElement(), 
       XPathConstants.NODESET); 


     System.out.println(month+":\n"); 

     for(int j = 0 ;j<monthWiseNodes.getLength();j++) 
     { 
      Node firstDay = monthWiseNodes.item(j); 

      if(firstDay.getNodeType() == Node.ELEMENT_NODE) 
      { 
       Element firstDayElement = (Element)firstDay; 

       System.out.println("\tDay:"+firstDayElement.getElementsByTagName("currentday").item(0).getTextContent()); 

       System.out.println("\tDate:"+firstDayElement.getElementsByTagName("date").item(0).getTextContent()); 

       System.out.println("\tTemperature:"+firstDayElement.getElementsByTagName("temperature").item(0).getTextContent()+" degrees"); 

       System.out.println("\tWeather:"+firstDayElement.getElementsByTagName("weather").item(0).getTextContent()); 

       System.out.println("\tHumidity:"+firstDayElement.getElementsByTagName("humidity").item(0).getTextContent()+"%\n"); 
      } 
     } 
    } 

}catch (SAXParseException err) { 
    System.out.println ("** Parsing error" + ", line " 
     + err.getLineNumber() + ", uri " + err.getSystemId()); 
    System.out.println(" " + err.getMessage()); 

    }catch (SAXException e) { 
    Exception x = e.getException(); 
    ((x == null) ? e : x).printStackTrace(); 

    }catch (Throwable t) { 
    t.printStackTrace(); 
    } 
}

来源

2016-07-27 11:58:40

这是一个非常粗糙的方法。多年的变化，你将不得不实施它（现在我已经按月汇总了，你必须汇总一年和一个月的关键）。

DocumentBuilderFactory docBuild = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder docBuilder = docBuild.newDocumentBuilder(); 
     Document doc = docBuilder.parse(new File("C:\\DevelopmentTools\\3.CODE\\Weather.xml")); 
     NodeList monthNodes = doc.getElementsByTagName("month"); 
     // monthNodes. 

     XPath xPath = XPathFactory.newInstance().newXPath(); 

     for (int i = 0; i < monthNodes.getLength(); i++) { 
      StringBuilder pathBuilder = new StringBuilder(); 
      pathBuilder.append("/Forecast/year/month[@name="); 
      pathBuilder.append("'"); 
      Element monthNode = (Element) monthNodes.item(i); 
      String month = monthNode.getAttribute("name"); 
      pathBuilder.append(month); 
      pathBuilder.append("']/day"); 

      NodeList monthWiseNodes = (NodeList) xPath.evaluate(pathBuilder.toString(), doc.getDocumentElement(), 
        XPathConstants.NODESET); 

      System.out.println("For the month of " + month + " number of days is " + monthWiseNodes.getLength()); 

     }

我得到这样的输出：

对于天的日数月的4

对于天的月数月的4

来源

2016-07-27 11:14:30

这里是正确的代码： –

阅读多个元素的XML

回答

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