java 如何用新值替换 XML 标签之间的旧值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15214818/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to replace old value between XML tags with new value
提问by JoshMachine
I have to replace the oldValuein the date tag with the newValuein the below XML. I am using setAttributefunction to do that but it doesn't seem to work. Please do let me know if I have to use a different function for replace text between tags.
我必须oldValue用newValue下面的 XML替换日期标记中的 。我正在使用setAttribute函数来做到这一点，但它似乎不起作用。如果我必须使用不同的函数来替换标签之间的文本，请告诉我。
myfile.xml
我的文件.xml
<?xml version="1.0" encoding="UTF-8" ?>
<root>
<date>oldValue</date>
</root>
replace.java
替换.java
Document doc = builder.parse(new File("myFile.xml"));
Element root = doc.getDocumentElement();
System.out.println("Before");
System.out.println("Using getElementByTagName date: " + root.getElementsByTagName("date").item(0).getTextContent());
System.out.println("Using getAttribute date: " + root.getAttribute("date"));
root.setAttribute("date", "newValue");
System.out.println("After");
System.out.println("Using getElementByTagName date: " + root.getElementsByTagName("date").item(0).getTextContent());
System.out.println("Using getAttribute date: " + root.getAttribute("date"));
Output:
输出：
**Before**
Using getElementByTagName date: oldValue
Using getAttribute date:
**After**
Using getElementByTagName date: oldValue
Using getAttribute date: test
With the a lot of reading/experimentation, I have found setAttribute()works for replacing an XML like this. But, this doesn't work for me.
通过大量的阅读/实验，我找到setAttribute()了替换这样的 XML 的工作。但是，这对我不起作用。
回答by Jayamohan
You need setTextContent(String textContent)method and not setAttributemethod.
您需要setTextContent(String textContent)方法而不是setAttribute方法。
root.getElementsByTagName("date").item(0).setTextContent("newValue");
oldValueis the TextContentof <date>element, not attribute. Check hereto find what is attribute.
oldValue是TextContent的<date>元件，而不是属性。检查此处以查找什么是属性。
回答by Alex
If you set attribute you change attribute of node root, so it will be like <root attrName = "attrValue">
如果你设置属性，你会改变节点根的属性，所以它会像<root attrName = "attrValue">
There are questions which can help you to find an answer.
有一些问题可以帮助您找到答案。
Problems setting a new node value in java, dom, xml parsing
dynamically set value to xml using jdom
