Chi*_*ani 2 java xml hashmap xml-parsing java-8
我的xml看起来像:
<?xml version="1.0"?>
<Grid id = 1>
<Setup id = "1">
<Group name = "DrawingRoom">
<Light id = "1">
<name>Light1</name>
<type>ben</type>
<index>1</index>
</Light>
<Light id = "2">
<name>Light2</name>
<type>crux</type>
<index>2</index>
</Light>
<Light id = "3">
<name>Light3</name>
<type>let</type>
<index>3</index>
</Light>
</Group>
<Group name = "BedRoom">
<Light id = "1">
<name>Light1</name>
<type>let</type>
<index>4</index>
</Light>
</Group>
</Setup>
<Setup id = "2">
<Group name = "ClubRoom">
<Light id = "1">
<name>Light1</name>
<type>let</type>
<index>1</index>
</Light>
</Group>
</Setup>
</Grid>
当我尝试在解析xml时填充hashmap时出现问题.我使用四个hashmap来保存不同级别的信息.因此,最终的hashmap包含来自较低级别的hashmap,例如setup,group和light,每个级别的属性是该级别的相应地图的键.
public HashMap<String,String> lightContent = new HashMap<String,String>();
public HashMap<String, HashMap<String,String>> groupContent = new HashMap<String, HashMap<String,String>>();
public HashMap<String, HashMap<String, HashMap<String,String>>> setupContent = new HashMap<String, HashMap<String, HashMap<String,String>>>();
public HashMap<String, HashMap<String, HashMap<String, HashMap<String,String>>>> gridContent = new HashMap<String, HashMap<String, HashMap<String, HashMap<String,String>>>>();
在解析过程中,问题在于,随着hashmap的更新,自动包含这些hashmap的hashmap也是如此.因此,当覆盖较低级别的hashmap时,先前的条目将丢失.
我理解hashmap中的"key"指向value的位置(这里是另一个hashmap).因此,混淆了,接下来可以做什么来检索所有xml数据到hashmap.感谢你在这方面的帮助!!
我担心,为此目的不能使用任何外部库.这是功能:
public void getSetupConfiguration()
{
try {
File fXmlFile = new File("D:\\SetupConfig.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
NodeList nodeList = doc.getChildNodes();
if (doc.hasChildNodes())
{
for (int count1 = 0; count1 < nodeList.getLength(); count1++)
{
System.out.println(nodeList.getLength());
Node gridNode = nodeList.item(count1);
if (gridNode.getNodeType() == Node.ELEMENT_NODE)
{
String presentNodeName = gridNode.getNodeName();
// get node name and value
// System.out.println("\nNode Name =" + presentNodeName);
if (presentNodeName.equalsIgnoreCase("Grid"))
{
if (gridNode.hasChildNodes())
{
Node setupNode = gridNode.getFirstChild();
while (setupNode != null)
{
if (setupNode.getNodeType() == Node.ELEMENT_NODE)
{
System.out.println(setupNode.getNodeName());
//Getting group
Node groupNode = setupNode.getFirstChild();
while (groupNode != null)
{
if (groupNode.getNodeType() == Node.ELEMENT_NODE)
{
System.out.println(groupNode.getNodeName());
// Getting lights
Node lightNode = groupNode.getFirstChild();
while (lightNode != null)
{
if (lightNode.getNodeType() == Node.ELEMENT_NODE)
{
System.out.println(lightNode.getNodeName());
// Getting individual lights
Node lights = lightNode.getFirstChild();
while (lights != null)
{
if (lights.getNodeType() == Node.ELEMENT_NODE)
{
lightContent.put(lights.getNodeName(), lights.getTextContent());
System.out.println("aaa");
}
lights = lights.getNextSibling();
}
NamedNodeMap lightMap = lightNode.getAttributes();
String lightId = "";
// To get id of Light element
for (int i = 0; i < lightMap.getLength(); i++ )
{
Node lightItem = lightMap.item(i);
lightId = lightItem.getNodeValue();
}
groupContent.put(lightId, lightContent);
System.out.println(groupContent);
}
lightNode = lightNode.getNextSibling();
}// Populating Light Node Ends
NamedNodeMap groupMap = groupNode.getAttributes();
String groupName = "";
for (int i = 0; i < groupMap.getLength(); i++ )
{
Node lightItem = groupMap.item(i);
groupName = lightItem.getNodeValue();
}
setupContent.put(groupName, groupContent);
System.out.println(setupContent);
}
lightContent.clear();
groupContent.clear();
System.out.println(lightContent);
groupNode = groupNode.getNextSibling();
}
}
if (setupNode.getNodeType() == Node.ELEMENT_NODE)
{
NamedNodeMap setupMap = setupNode.getAttributes();
String setUpId = "";
for (int i = 0; i < setupMap.getLength(); i++ )
{
Node lightItem = setupMap.item(i);
setUpId = lightItem.getNodeValue();
}
gridContent.put(setUpId, setupContent);
System.out.println(gridContent);
setupContent.clear();
}
setupNode = setupNode.getNextSibling();
}
}
// gridNode = gridNode.getNextSibling();
}
}
}
}
System.out.println(gridContent);
}
catch (Exception e)
{
e.printStackTrace();
}
System.out.println("Wow");
}
}
谢谢提前!!
我想你走错了路.如果你花时间真正地将数据解析为对象,那么我会创建一个真实的模型; 而不是使用字符串映射.你看,你目前的做法非常笨拙.那些地图地图不仅难以填充; 他们以后也很难用.虽然它不直接"可见" - 但您的XML数据是结构化的.并通过推说:"盲目"进入地图,你赚了很多该结构的更难获得.
我的意思是:在最低级别,你正在处理灯光.那你为什么不创建一个包含相应属性的Light 类呢？但不是原始字符串,而是已经转换为更具体的类型.然后你不会将Lights推入Map,而是将其推入List - 因为它们已经按顺序进入.
然后,您应该使用现有技术(如JAXB)将XML数据转换为"真实"对象 - 请参阅此处获取指导.