我现在有以下xml文件，名为＆＃34; Weather 2.xml＆＃34;：
<?xml version ="1.0" encoding="UTF-8" ?>
<weather>
<forecast_information>
<city data="Pittsford, NY" />
<postal_code data="14534" />
<forecast_date data="2015-03-12" />
<unit_system data="US" />
</forecast_information>
<current_conditions>
<condition data = "Mostly Cloudy" />
<temp_f data ="42" />
<wind_condition data="Wind: NW at 7 mph" />
</current_conditions>
<forecast_conditions>
<day_of_week data="Sat" />
<low data="32"/>
<high data = "45" />
<condition data="Rain and Snow" />
</forecast_conditions>
<forecast_information>
<city data= "Rochester, NY" />
<postal_code data="14623" />
<forecast_date data= "2015-03-12" />
<unit_system data="US" />
</forecast_information>
<current_conditions>
<condition data="Partly Cloudy" />
<temp_f data="40" />
<wind_condition data="Wind: St at 3.5 mph" />
</current_conditions>
<forecast_conditions>
<day_of_week data="Mon" />
<low data="30" />
<high data="40" />
<condition data="Bright and Sunny" />
</forecast_conditions>
</weather>
我已按照以下方式更改了我的程序：
public class DomParserDemo {
public static void main(String[] args){
try {
File inputFile = new File("Weather 2.xml");
DocumentBuilderFactory dbFactory
= DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :"
+ doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("forecast_information");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
System.out.println("\nCurrent Element :"
+ nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("City : " +eElement.getElementsByTagName("city").item(0).getAttributes().getNamedItem("data"));
System.out.println("Postal_Code : " + eElement.getElementsByTagName("postal_code").item(0).getAttributes().getNamedItem("data"));
System.out.println("Forecast date : " + eElement.getElementsByTagName("forecast_date").item(0).getAttributes().getNamedItem("data"));
System.out.println("Unit System : " + eElement .getElementsByTagName("unit_system") .item(0).getAttributes().getNamedItem("data"));
}
NodeList nList1 = doc.getElementsByTagName("current_conditions");
System.out.println("----------------------------");
for (temp = 0; temp < nList1.getLength(); temp++) {
Node nNode1 = nList1.item(temp);
System.out.println("\nCurrent Element :"
+ nNode1.getNodeName());
if (nNode1.getNodeType() == Node.ELEMENT_NODE) {
Element eElement1 = (Element) nNode1;
System.out.println("Condition : " + eElement1 .getElementsByTagName("condition") .item(0).getAttributes().getNamedItem("data"));
System.out.println("Temperature : " + eElement1 .getElementsByTagName("temp_f").item(0) .getAttributes().getNamedItem("data"));
System.out.println("Wind Condition : " + eElement1 .getElementsByTagName("wind_condition").item(0) .getAttributes().getNamedItem("data"));
}
NodeList nList2 = doc.getElementsByTagName("forecast_conditions");
System.out.println("----------------------------");
for (temp = 0; temp < nList2.getLength(); temp++) {
Node nNode2 = nList2.item(temp);
System.out.println("\nCurrent Element :"
+ nNode2.getNodeName());
if (nNode2.getNodeType() == Node.ELEMENT_NODE) {
Element eElement2 = (Element) nNode2;
System.out.println("Day of week : " + eElement2 .getElementsByTagName("day_of_week") .item(0).getAttributes().getNamedItem("data"));
System.out.println("Low : " + eElement2 .getElementsByTagName("low") .item(0).getAttributes().getNamedItem("data"));
System.out.println("High: " + eElement2 .getElementsByTagName("high") .item(0).getAttributes().getNamedItem("data"));
System.out.println("Condition: " + eElement2 .getElementsByTagName("condition") .item(0).getAttributes().getNamedItem("data"));
}
}
} }}
catch (Exception e) {
e.printStackTrace();
}
}
输出显示不在订单中＆amp;一些领域缺失：
Root element :weather
----------------------------
Current Element :forecast_information
City : data="Pittsford, NY"
Postal_Code : data="14534"
Forecast date : data="2015-03-12"
Unit System : data="US"
----------------------------
Current Element :current_conditions
Condition : data="Mostly Cloudy"
Temperature : data="42"
Wind Condition : data="Wind: NW at 7 mph"
----------------------------
Current Element :forecast_conditions
Day of week : data="Sat"
Low : data="32"
High: data="45"
Condition: data="Rain and Snow"
Current Element :forecast_conditions
Day of week : data="Mon"
Low : data="30"
High: data="40"
Condition: data="Bright and Sunny"
我希望代码能够按顺序显示：预测信息，当前条件和预测条件;两个XML文件中有两个记录
答案 0 :(得分：0)
未打印所有数据的原因：您在所有for循环中使用了int变量temp相同
详细信息：for循环int变量temp在每个循环forecast_information，current_conditions和forecast_conditions中初始化。当forecast_conditions的for循环执行两次时，int变量temp值为2，因此不会执行forecast_information和current_conditions的for循环。
解决方案： 为每个for循环分配变量。 嵌套for循环将导致多次打印current_conditions和forecast_conditions数据，因此您必须重新构建代码以避免嵌套for循环。