XmlPullParser (Java version)
The following are common methods and instructions for XmlPullParser to parse XML files:
1. XmlPullParserFactory.newInstance()：Create an XmlPullParserFactory instance.
2. XmlPullParserFactory.setNamespaceAware(boolean)：Set whether to support XML namespace.
3. XmlPullParserFactory.setValidating(boolean)：Set whether to support DTD verification.
4. XmlPullParserFactory.newPullParser()：Create an XmlPullParser instance.
5. XmlPullParser.setInput(InputStream, String)：Set the input stream and encoding method of the XML file to be parsed.
6. XmlPullParser.getEventType()：Gets the event type of the current parser.
7. XmlPullParser.getName()：Get the name of the current node.
8. XmlPullParser.getText()：Get the text content of the current node.
9. XmlPullParser.next()：Move to next node.
10. XmlPullParser.nextTag()：Move to next label node.
11. XmlPullParser.getAttributeCount()：Get the number of attributes of the current node.
12. XmlPullParser.getAttributeName(int)：Get the attribute name of the current node at the specified position.
13. XmlPullParser.getAttributeValue(int)：Get the attribute value of the current node at the specified position.
14. XmlPullParser.getDepth()：Get the depth of the current node.
15. XmlPullParser.END_DOCUMENT：Indicates that the end of the XML file has been reached.
16. XmlPullParser.START_TAG：Indicates that the current node is a label node.
17. XmlPullParser.END_TAG：Indicates that the current node is an end tag node.
Parsing order: starting tag event----> text event----> then ending tag event
For example:
<?xml version="1.0" encoding="utf-8"?>
<keys>
<board id="xml1">1
<source>android 01</source>2
<source>android 02</source>2
<source>android 03</source>2
</board>
<board id="xml2">1
<source>ios 01</source>3
<source>ios 02</source>3
<source>ios 05</source>3
</board>4
</keys>
Parsing code:
private void parseData(){
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser parser = factory.newPullParser();
InputStream inputStream = getAssets().open("text.xml");
parser.setInput(inputStream,"utf-8");
int eventType = parser.getEventType();
String board = "";
while (eventType != XmlPullParser.END_DOCUMENT){
switch (eventType) {
case XmlPullParser.TEXT:
Log.d(TAG, "parseData: text " + parser.getName() + " " + parser.getText());
break;
case XmlPullParser.START_TAG:
String keys = parser.getName();
Log.d(TAG, "parseData: start -----" + parser.getName());
if (keys.equals("board")) {
board = parser.getAttributeValue(null, "id");
}
if (board.equals("xml1")) {
if (keys.equals("source")) {
// String result = parser.getText();
// Log.d(TAG, "initData: result = " + result);
// parser.next(); // 移动解析器到下一个事件，即 TEXT 事件
// String result = parser.getText();
// Log.d(TAG, "initData: result = " + result);
}
}
break;
case XmlPullParser.END_TAG:
Log.d(TAG, "initData: end -------" + parser.getName());
break;
}
eventType = parser.next();
}
} catch (IOException | XmlPullParserException e) {
throw new RuntimeException(e);
}
}
operation result:
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: start -----keys
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: text null
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: start -----board
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: text null 1
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.553 22162-22162 MainActivity com.example.third D parseData: text null android 01
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null 2
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null android 02
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null 2
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null android 03
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null 2
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D initData: end -------board
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: text null
2023-06-06 14:35:41.554 22162-22162 MainActivity com.example.third D parseData: start -----board
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null 1
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null ios 01
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null 3
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null ios 02
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null 3
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: start -----source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null ios 05
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D initData: end -------source
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null 3
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D initData: end -------board
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D parseData: text null 4
2023-06-06 14:35:41.555 22162-22162 MainActivity com.example.third D initData: end -------keys
DocumentBuilderFactory(kotlin版)
The following are common methods and usage instructions of org.w3c.dom.Node:
1. getNodeName()：Get the name of the node.
2. getNodeValue()：Get the value of a node.
3. getNodeType()：Get the type of node and return an integer value. The specific values are as follows:
- ELEMENT_NODE（1）：Element node
- ATTRIBUTE_NODE（2）：Attribute
- TEXT_NODE（3）：node Text node
- CDATA_SECTION_NODE（4）：CDATA node
- ENTITY_REFERENCE_NODE（5）：Entity reference node
- ENTITY_NODE（6）：Entity node
- PROCESSING_INSTRUCTION_NODE（7）：Processing instruction node
- COMMENT_NODE（8）：Comment node Document
- DOCUMENT_NODE（9）：node
- DOCUMENT_TYPE_NODE（10）：Document type node Document
- DOCUMENT_FRAGMENT_NODE（11）：fragment node Symbol
- NOTATION_NODE（12）：node
4. getChildNodes()：Get the node's child node list and return a NodeList object.
-
getParentNode()：Get the parent node of the node and return a Node object. -
getAttributes()：Get the attribute list of the node and return a NamedNodeMap object. -
hasChildNodes()：Determine whether the node has child nodes and return a Boolean value. -
getTextContent()：Get the text content of the node and return a string. -
getFirstChild()：Get the first child node of the node and return a Node object. -
getLastChild()：Get the last child node of the node and return a Node object. -
getNextSibling()：Get the next sibling node of the node and return a Node object. -
getPreviousSibling()：Get the previous sibling node of the node and return a Node object.
xml used by test cases:
<?xml version="1.0" encoding="UTF-8"?>
<config>
<!--我是注释，也能被解析出来-->
<A>Apple</A>
我是A和B中间的文本
<B>Banana</B>
<C>我是C文本
<D>Dog</D>我是D和E之间的文本
<E>elephant</E>
</C>我是C和F之间的文本
<F>foot</F>我是F和G之间的文本
<G>god</G>
</config>
Test case code:
fun main() {
try {
val factory = DocumentBuilderFactory.newInstance()
val builder = factory.newDocumentBuilder()
val file = File("D:\\DevSpace\\IDEA\\Project\\GUIProject\\src\\kotlinLearning\\config.xml")
if(file.exists()){
val stream = file.inputStream()
val document = builder.parse(stream)
val rootElement = document.documentElement
println("${
rootElement.tagName} ${
rootElement.nodeName} ${
rootElement.nodeValue}")
println("============================================================================")
val nodeList = rootElement.childNodes
for(i in 0 until nodeList.length){
val configNode : Node = nodeList.item(i)
//单独判断C,有子标签的
if(configNode.nodeName == "C"){
val element = configNode as Element
println("tagName: ${
element.tagName} 节点name: ${
element.nodeName} 节点值: ${
element.nodeValue} ")
val childNodes = element.childNodes
for (j in 0 until childNodes.length){
val child = childNodes.item(j)
if(child.nodeType == Element.ELEMENT_NODE){
val firstChild = child.firstChild
val nodeValue = firstChild.nodeValue
val nodeName = firstChild.nodeName
println("launcherInfo子节点的名为：$nodeName 值为:$nodeValue")
}
}
}else{
println("Node的类型为: ${
configNode.nodeType} Node的名字为: ${
configNode.nodeName} Node的值为: ${
configNode.nodeValue} Node的子值为: ${
configNode.firstChild?.nodeValue}")
}
}
}else{
println(file.absoluteFile)
println("文件不存在")
}
}catch (e:Exception){
e.stackTrace
}
}
operation result:
config config null
============================================================================
Node的类型为: 3 Node的名字为: #text Node的值为:
Node的子值为: null
Node的类型为: 8 Node的名字为: #comment Node的值为: 我是注释，也能被解析出来 Node的子值为: null
Node的类型为: 3 Node的名字为: #text Node的值为:
Node的子值为: null
Node的类型为: 1 Node的名字为: A Node的值为: null Node的子值为: Apple
Node的类型为: 3 Node的名字为: #text Node的值为:
我是A和B中间的文本
Node的子值为: null
Node的类型为: 1 Node的名字为: B Node的值为: null Node的子值为: Banana
Node的类型为: 3 Node的名字为: #text Node的值为:
Node的子值为: null
tagName: C 节点name: C 节点值: null
launcherInfo子节点的名为：#text 值为:Dog
launcherInfo子节点的名为：#text 值为:elephant
Node的类型为: 3 Node的名字为: #text Node的值为: 我是C和F之间的文本
Node的子值为: null
Node的类型为: 1 Node的名字为: F Node的值为: null Node的子值为: foot
Node的类型为: 3 Node的名字为: #text Node的值为: 我是F和G之间的文本
Node的子值为: null
Node的类型为: 1 Node的名字为: G Node的值为: null Node的子值为: god
Node的类型为: 3 Node的名字为: #text Node的值为:
Node的子值为: null