直接使用 JSTL Expression Language

The Jakarta Taglibs Project

/* Main Class
Dependency
  jstl.jar
  taglibs standard.jar
  servlet-api.jar
  jsp-api.jar
*/
import javax.servlet.jsp.PageContext;

import org.apache.taglibs.standard.lang.jstl.ELEvaluator;
import org.apache.taglibs.standard.lang.jstl.ELException;
import org.apache.taglibs.standard.lang.jstl.JSTLVariableResolver;
import org.apache.taglibs.standard.lang.jstl.VariableResolver;
import org.apache.taglibs.standard.lang.jstl.test.PageContextImpl;

public class Main {
 public static void main(String[] args) throws ELException {
  VariableResolver vr = new JSTLVariableResolver();
  ELEvaluator e = new ELEvaluator(vr);
  PageContext pContext = new PageContextImpl();
  pContext.setAttribute("user", "Solnone");
  Object o = e.evaluate("Hello ${user}", 
    pContext, String.class, null, null);
  System.out.println(o);
 }
}
/* System.out
Hello Solnone
*/