一些启发规格严格

Here would be a couple of workaround solutions that you could choose from, if you don't find an actual Java expression evaluation library:

• Evaluate your expressions using XPath.
  • Pros: XPath knows logical operators, and you can implement variables and custom functions using Xalan's extensions
  • Cons: XPath has fewer types than Java
• Evaluate your expressions using JavaScript.
  • Pros: Javascript is very flexible and will still be suitable when your requirements tighten. You can implement variables and custom functions using Javascript as well
  • Cons: Javascript has fewer types than Java
• Evaluate your expressions using JSP's expression language (e.g. with JUEL)