创建xml文件时如何在java中使用<，>标签

Question

I want to html tag in xml. I'm using CDATA it is run in xml but I create xml file with java <, > tags was "<". I don't understand this situation.

String returnUrl="<![CDATA[ac=S<br/>DNbZCQOijAl6HrAAyyGV]]>";
Node returnUrlNode = doc.createElement("returnurl");
returnUrlNode.setTextContent(returnUrl);
userNode.appendChild(returnUrlNode);

Answer 1

If for whatever reason you want the text to be in a CDATA section and not a simple text node, you'll need to create the CDATA yourself. I'm assuming you're using the DOM and not some API that looks similar, so it would be:

Node returnUrlNode = doc.createElement("returnurl");
returnUrlNode.appendChild(
    doc.createCDATASection(
        "Whatever text you wanted to go in here, including unescaped < and >."));

Note that like SLaks pointed out, when the DOM is serialized, all escaping will happen automatically. (In this case, that means that the <![CDATA[ and ]]> will be added automatically.) This is just how you'd create an actual CDATA section if you need the output to be a CDATA section and not a normal text node.

Answer 2

The Java XML APIs will automatically escape your content.

You can just write .setTextContent("ac=S<br/>DNbZCQOijAl6HrAAyyGV") , and Java will excape the < and > for you.

Answer 3

You need to use the XML escape characters:

 & &amp; < &lt; > &gt; " &quot; ' &apos;