Posted in Python onApril 05, 2015
在Python中解析XML文件也有Dom和Sax两种方式,这里先介绍如何是使用Dom解析XML,这一篇文章是Dom生成XML文件,下一篇文章再继续介绍Dom解析XML文件。
在生成XML文件中,我们主要使用下面的方法来完成。
主要方法
1、生成XML节点(node)
createElement("node_name")
2、给节点添加属性值(Attribute)
node.setAttribute("att_name", "arr_value")
3、节点的标签值(data)
createTextNode("node_value")
其中第1、3点在创建完节点(节点值)之后,还需使用下面的方法添加到指点的节点的位置下面:
prev_node.appendChild(cur_node)
这里的prev_node要添加节点的上一层节点,而cur_node即为当前要添加的节点了。
代码演示
下面用代码来演示下如何使用Dom来生成XML,这个是简单版本,如下:
''' Created on 2012-8-28 @author: walfred @module: domxml.genXML @description: ''' import xml.dom.minidom as Dom if __name__ == "__main__": doc = Dom.Document() root_node = doc.createElement("book_store") root_node.setAttribute("name", "newhua") root_node.setAttribute("website", "https://3water.com") doc.appendChild(root_node) book_node = doc.createElement("book1") book_name_node = doc.createElement("name") book_name_value = doc.createTextNode("hamlet") book_name_node.appendChild(book_name_value) book_node.appendChild(book_name_node) book_author_node = doc.createElement("author") book_author_value = doc.createTextNode("William Shakespeare") book_author_node.appendChild(book_author_value) book_node.appendChild(book_author_node) root_node.appendChild(book_node) f = open("book_store.xml", "w") f.write(doc.toprettyxml(indent = "\t", newl = "\n", encoding = "utf-8")) f.close()
这个代码将在当前目录下生成一个book_store.xml文件,我把它也贴在下面:
<?xml version="1.0" encoding="utf-8"?> <book_store name="newhua" website="https://3water.com"> <book1> <name>hamlet</name> <author>William Shakespeare</author> </book1> </book_store>
当然一旦你掌握了这些基本方法之后,我们可以用一个类来更好的完成,这个类我们称之为XMLGenerator,代码如下:
''' Created on 2012-8-28 @author: walfred @module: domxml.wXMLbyDom @description: ''' import xml.dom.minidom as Dom class XMLGenerator: def __init__(self, xml_name): self.doc = Dom.Document() self.xml_name = xml_name def createNode(self, node_name): return self.doc.createElement(node_name) def addNode(self, node, prev_node = None): cur_node = node if prev_node is not None: prev_node.appendChild(cur_node) else: self.doc.appendChild(cur_node) return cur_node def setNodeAttr(self, node, att_name, value): cur_node = node cur_node.setAttribute(att_name, value) def setNodeValue(self, cur_node, value): node_data = self.doc.createTextNode(value) cur_node.appendChild(node_data) def genXml(self): f = open(self.xml_name, "w") f.write(self.doc.toprettyxml(indent = "\t", newl = "\n", encoding = "utf-8")) f.close() if __name__ == "__main__": myXMLGenerator = XMLGenerator("book_store.xml") #xml root node node_book_store = myXMLGenerator.createNode("book_store") myXMLGenerator.setNodeAttr(node_book_store, "name", "new hua") myXMLGenerator.setNodeAttr(node_book_store, "website", "https://3water.com") myXMLGenerator.addNode(node = node_book_store) #book01 node_book_01 = myXMLGenerator.createNode("book") node_book_01_name = myXMLGenerator.createNode("name") myXMLGenerator.setNodeValue(node_book_01_name, "Hamlet") myXMLGenerator.addNode(node_book_01_name, node_book_01) node_book_01_author = myXMLGenerator.createNode("author") myXMLGenerator.setNodeValue(node_book_01_author, "William Shakespeare") myXMLGenerator.addNode(node_book_01_author, node_book_01) node_book_01_price = myXMLGenerator.createNode("price") myXMLGenerator.setNodeValue(node_book_01_price, "$20") myXMLGenerator.addNode(node_book_01_price, node_book_01) node_book_01_grade = myXMLGenerator.createNode("grade") myXMLGenerator.setNodeValue(node_book_01_grade, "good") myXMLGenerator.addNode(node_book_01_grade, node_book_01) myXMLGenerator.addNode(node_book_01, node_book_store) #book 02 node_book_02 = myXMLGenerator.createNode("book") node_book_02_name = myXMLGenerator.createNode("name") myXMLGenerator.setNodeValue(node_book_02_name, "shuihu") myXMLGenerator.addNode(node_book_02_name, node_book_02) node_book_02_author = myXMLGenerator.createNode("author") myXMLGenerator.setNodeValue(node_book_02_author, "naian shi") myXMLGenerator.addNode(node_book_02_author, node_book_02) node_book_02_price = myXMLGenerator.createNode("price") myXMLGenerator.setNodeValue(node_book_02_price, "$200") myXMLGenerator.addNode(node_book_02_price, node_book_02) node_book_02_grade = myXMLGenerator.createNode("grade") myXMLGenerator.setNodeValue(node_book_02_grade, "good") myXMLGenerator.addNode(node_book_02_grade, node_book_02) myXMLGenerator.addNode(node_book_02, node_book_store) #gen myXMLGenerator.genXml()
同样这个方法会在本目录下生成一个book_store.xml文件,如下:
<?xml version="1.0" encoding="utf-8"?> <book_store name="new hua" website="https://3water.com"> <book> <name>Hamlet</name> <author>William Shakespeare</author> <price>$20</price> <grade>good</grade> </book> <book> <name>shuihu</name> <author>naian shi</author> <price>$200</price> <grade>good</grade> </book> </book_store>
这个版本算一个稍微高级的版本,但由于时间有限还很显得粗糙,读者可以发挥出更好的。
Python中使用dom模块生成XML文件示例
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junjie声明:登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述。
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