[英]XML: to append xml document into the node of another document
I have to insert file1.xml elements into another file2.xml. 我必须将file1.xml元素插入另一个file2.xml。 file2.xml has several node and each node has it's node_id. file2.xml有几个节点,每个节点都有node_id。 is there any way to do that. 有没有办法做到这一点。
let suppose : 让我们假设:
file1.xml : file1.xml:
< root>
<node_1>......</node_1>
</root>
file2.xml : file2.xml:
< root>
< node>
< node_id>1'<'/node_id>
< /node>
< /root>
I want ? 我想要 ? file2.xml : file2.xml:
< root>
< node>
<node_1>......</node_1> [here i want to append the file1.xml]
</node>
</root>
The following code illustrates this: 以下代码说明了这一点:
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
//build DOMs
Document doc1 = builder.parse(new File("file1.xml"));
Document doc2 = builder.parse(new File("file2.xml"));
//get all node_ids from doc2 and iterate
NodeList list = doc2.getElementsByTagName("node_id");
for(int i = 0 ; i< list.getLength() ; i++){
Node n = list.item(i);
//extract the id
String id = n.getTextContent();
//now get all node_id elements from doc1
NodeList list2 = doc1.getElementsByTagName("node_"+id);
for(int j = 0 ; j< list2.getLength() ; j++){
Node m = list2.item(j);
//import them into doc2
Node imp = doc2.importNode(m,true);
n.getParent().appendChild(imp);
}
}
//write out the modified document to a new file
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
Source source = new DOMSource(doc2);
Result output = new StreamResult(new File("merged.xml"));
transformer.transform(source, output);
The result would be: 结果将是:
<root>
<node>
<node_id>1</node_id>
<node_1>This is 1</node_1>
</node>
<node>
<node_id>2</node_id>
<node_2>This is 2</node_2>
</node>
<node>
<node_id>3</node_id>
<node_3>This is 3</node_3>
</node>
</root>
Usual approach: 通常的做法:
parse both documents from file1 and file2 into Document
objects (SAXParser, jDom, dom4j), then import element <node_1>
from the first document to the second and add it to <node>
. 将file1和file2中的Document
解析为Document
对象(SAXParser,jDom,dom4j),然后将元素<node_1>
从第一个文档导入到第二个文档,并将其添加到<node>
。 Then delete the corresponding <node_id>
element. 然后删除相应的<node_id>
元素。
Importing is necessary, the Document
implementations offer the correct methods for this process! 导入是必要的, Document
实现为此过程提供了正确的方法! Just adding an element from one document to another documents will result in DOMExceptions
. 只需将一个文档中的元素添加到另一个文档中,就会产生DOMExceptions
。
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