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Escape characters in XML/HTML

I have a field in database that may contain special characters like <, >, etc. I need to write this field value into an XML message or HTML page. However, the  special characters will cause the XML/HTML to fail.

For HTML, I am using JSP to render. Beside using <%= theField %> to display the value, is there other tag (such as Struts tag) that I can use to escape the special characters?

For XML, I am using Castor to map between object and XML. Is there a library method that I can use to ensure that all special characters are esacped?
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Manish
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yongsing

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Thanks. Looks like this is what I'm looking for. I will try out and let you know.