How could I get a parameter in JSP?

问题

Here is my action execute() method,

@Override
public String execute() throws Exception {

    ActionContext aContext = ActionContext.getContext();        
    aContext.getParameters().put("reqVar1", "reqVar1-Value");

    return SUCCESS;
}

I want to get the parameter value in JSP　like below code,

<s:property value="#parameters.reqVar1" />

but it doesn't work.

I see the parameter is in stack context:

How could I get the parameter value in JSP?

回答1:

Parameters are always use a type Map<String, String[]>. And you need to put parameter correctly, i.e.

aContext.getParameters().put("reqVar1", new String[] {"reqVar1-Value"});

and get correctly, i.e.

<s:property value="%{#parameters.reqVar1[0]}" />

The better approach is to use params interceptor that is included in thedefaultStack to populate parameters from the request.

Also see:

• How can we access request parameters passed into an Action
• How to use parameters in JSP

来源：https://stackoverflow.com/questions/17874274/how-could-i-get-a-parameter-in-jsp