java中的ValueExpression在解析String和特殊字符时抛出null

Question

我想使用Java EL来解析表达式。表达式可以是String，Integer，Float等。 以下是我为ElResolver设置上下文的地图

$ git checkout -b <branch> --track <remote>/<branch>

我想迭代遍历地图的每个元素，并从hashmap

获取相应键的值

Map<String,String>  varibalesMap= new HashMap<String,String>();
varibalesMap.put("var1","1000");
varibalesMap.put("var2","DemoTest");
varibalesMap.put("var3","3000$ 10 %");

if(null!=dynamicVaribalesMap && !dynamicVaribalesMap.isEmpty())
{
  ELContext elContext = JRFContext.getELContext();
  ELResolver elResolver = elContext.getELResolver();
  elResolver.setValue(elContext, null, "varibalesMap", varibalesMap);
}
String result1=getValuesMap(varibalesMap.get("var1");
String result2=getValuesMap(varibalesMap.get("var2");
String result3=getValuesMap(varibalesMap.get("var3");

虽然我能够看到填充的对象

  

variableExpression

可变

  

（String）variableExpression.getValue（ElContext.getELContext（））;是   为String返回null。

public String getValuesMap(String result)
{
    ExpressionFactory  expressionFactory = ElContext.getExpressionFactory();
    ELContext elContext = ElContext.getELContext();
    ELResolver elResolver = elContext.getELResolver();
    Map<String,String> dynVar=null;
    String returnValue="";
    if(elContext!=null && elContext.isPropertyResolved())
    {
        dynamicVariables=(Map<String, String>) elResolver.getValue(elContext, null, "varibalesMap");
        if(null!=dynVar&& !dynVar.isEmpty())
        {

            ValueExpression variableExpression = expressionFactory.createValueExpression(ElContext.getELContext(), "#{" + dynVar.get(result) + "}", String.class);
            returnValue = (String) variableExpression.getValue(ElContext.getELContext());
        }
    }
        return returnValue;
}