将节点附加到现有的 xml-Java
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Append node to an existing xml-Java
提问by Ajay
I have seen the same question being answered for vb and c#, but i need a Java best solution for appending nodes to an xml. Will xpath help? I have
我已经看到为 vb 和 c# 回答了相同的问题，但我需要一个 Java 最佳解决方案来将节点附加到 xml。xpath 有帮助吗？我有
<A>
<B>
<c>1<c/>
<d>2<d/>
<e>3<e/>
</B>
<B>
<c>1<c/>
<d>2<d/>
<e>3<e/>
</B>
</A>
Need to append another
需要附加另一个
<B>
<c>11<c/>
<d>21<d/>
<e>31<e/>
</B>
回答by Jon Skeet
XPath will help you to findnodes, but not really appendthem. I don't think you'd find it particularly useful here.
XPath 将帮助您查找节点，但不会真正附加它们。我不认为你会发现它在这里特别有用。
Which XML API are you using? If it's the W3C DOM (urgh) then you'd do something like:
您使用的是哪个 XML API？如果它是 W3C DOM (urgh) 那么你会做这样的事情：
Element newB = document.createElement("B");
Element newC = document.createElement("c");
newC.setTextContent("11");
Element newD = document.createElement("d");
newD.setTextContent("21");
Element newE = document.createElement("e");
newE.setTextContent("31");
newB.appendChild(newC);
newB.appendChild(newD);
newB.appendChild(newE);
document.getDocumentElement().appendChild(newB);
回答by Winston Chen
The most strait-forward way is that you parse, using Saxor Dom, all the files into a data structure, for example an A class which has a B class with members of C,D,E class in your case.
最严格的方法是使用Sax或Dom 将所有文件解析为一个数据结构，例如一个 A 类，它有一个 B 类，在您的情况下是 C、D、E 类的成员。
And output the data structure back to XML.
并将数据结构输出回 XML。
回答by vtd-xml-author
You may want to use XMLModier of vtd-xml to do it in a cool way, which is to append the byte content directly... You just need to call XMLModier's insertAfterElement()... below is a link to the code sample: Incrementally Modify XML in Java:
你可能想使用 vtd-xml 的 XMLModier 来做一个很酷的事情，就是直接追加字节内容...你只需要调用 XMLModier 的 insertAfterElement()... 下面是代码示例的链接：在 Java 中增量修改 XML：
import com.ximpleware.*;
import java.io.*;
public class ModifyXML {
public static void main(String[] s) throws Exception{
VTDGen vg = new VTDGen(); // Instantiate VTDGen
XMLModifier xm = new XMLModifier(); //Instantiate XMLModifier
if (vg.parseFile("old.xml",false)){
VTDNav vn = vg.getNav();
xm.bind(vn);
// first update the value of attr
int i = vn.getAttrVal("attr");
if (i!=-1){
xm.updateToken(i,"value");
}
// navigate to <a>
if (vn.toElement(VTDNav.FC,"a")) {
// update the text content of <a>
i=vn.getText();
if (i!=-1){
xm.updateToken(i," new content ");
}
// insert an element before <a> (which is the cursor element)
xm.insertBeforeElement("<b/>\n\t");
// insert an element after <a> (which is the cursor element)
xm.insertAfterElement("\n\t<c/>");
}
xm.output(new FileOutputStream("new.xml"));
}
}
}
