Java实现字符串转换成可执行代码的教程

import java.util.Map;

import org.apache.commons.jexl2.Expression;
import org.apache.commons.jexl2.JexlContext;
import org.apache.commons.jexl2.JexlEngine;
import org.apache.commons.jexl2.MapContext;

/**
 * 动态加载方法
 *
 */
public class DyMethodUtil {

 public static Object invokeMethod(String jexlExp,Map map){
  JexlEngine jexl=new JexlEngine();
  Expression e = jexl.createExpression(jexlExp);
  JexlContext jc = new MapContext();
  for(String key:map.keySet()){
   jc.set(key, map.get(key));
  }
  if(null==e.evaluate(jc)){
   return "";
  }
  return e.evaluate(jc);
 }

}

Map map=new HashMap(); 
map.put("testService",testService); 
map.put("person",person); 
String expression="testService.save(person)"; 
DyMethodUtil.invokeMethod(expression,map);